Updated release notes

Also Fixes #306

.bettercodehub.yml

@@ -0,0 +1,8 @@
+exclude:
+- /build-publishing.gradle
+- /build.gradle
+- /settings.gradle
+component_depth: 1
+languages:
+- groovy
+- java

.gitignore

@@ -11,7 +11,11 @@
 
 # Output dirs
 target/
+classes/
 build/
+docs/
 .gradle/
+sshj.jar
 
-
+# MacOS X
+.DS_Store

.travis.yml

@@ -1,2 +1,5 @@
 language: java
 sudo: false
+jdk:
+  - oraclejdk7
+  - oraclejdk8

README.adoc

@@ -1,10 +1,13 @@
 = sshj - SSHv2 library for Java
 Jeroen van Erp
 :sshj_groupid: com.hierynomus
-:sshj_version: 0.15.0
+:sshj_version: 0.21.1
 :source-highlighter: pygments
 
-image::https://travis-ci.org/hierynomus/sshj.svg?branch=master[]
+image:https://travis-ci.org/hierynomus/sshj.svg?branch=master[link="https://travis-ci.org/hierynomus/sshj"]
+image:https://api.codacy.com/project/badge/Grade/14a0a316bb9149739b5ea26dbfa8da8a["Codacy code quality", link="https://www.codacy.com/app/jeroen_2/sshj?utm_source=github.com&utm_medium=referral&utm_content=hierynomus/sshj&utm_campaign=Badge_Grade"]
+image:https://maven-badges.herokuapp.com/maven-central/com.hierynomus/sshj/badge.svg["Maven Central",link="https://maven-badges.herokuapp.com/maven-central/com.hierynomus/sshj"]
+image:https://javadoc-emblem.rhcloud.com/doc/com.hierynomus/sshj/badge.svg["Javadoc",link="http://www.javadoc.io/doc/com.hierynomus/sshj"]
 
 To get started, have a look at one of the examples. Hopefully you will find the API pleasant to work with :)
 
@@ -34,7 +37,7 @@ If you're building your project using Maven, you can add the following dependenc
 If your project is built using another build tool that uses the Maven Central repository, translate this dependency into the format used by your build tool.
 
 == Building SSHJ
-. Clone the Overthere repository.
+. Clone the SSHJ repository.
 . Ensure you have Java6 installed with the http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html[Unlimited strength Java Cryptography Extensions (JCE)].
 . Run the command `./gradlew clean build`.
 
@@ -63,8 +66,13 @@ ciphers::
   SSHJ also supports the following extended (non official) ciphers: `camellia{128,192,256}-{cbc,ctr}`, `camellia{128,192,256}-{cbc,ctr}@openssh.org`
 
 key exchange::
-  `diffie-hellman-group1-sha1`, `diffie-hellman-group14-sha1`, `diffie-hellman-group-exchange-sha1`, `diffie-hellman-group-exchange-sha256`,
+  `diffie-hellman-group1-sha1`, `diffie-hellman-group14-sha1`,
+  `diffie-hellman-group14-sha256`, `diffie-hellman-group15-sha512`, `diffie-hellman-group16-sha512`, `diffie-hellman-group17-sha512`, `diffie-hellman-group18-sha512`
+  `diffie-hellman-group-exchange-sha1`, `diffie-hellman-group-exchange-sha256`,
   `ecdh-sha2-nistp256`, `ecdh-sha2-nistp384`, `ecdh-sha2-nistp521`, `curve25519-sha256@libssh.org`
+  SSHJ also supports the following extended (non official) key exchange algoriths:
+  `diffie-hellman-group14-sha256@ssh.com`, `diffie-hellman-group15-sha256`, `diffie-hellman-group15-sha256@ssh.com`, `diffie-hellman-group15-sha384@ssh.com`,
+  `diffie-hellman-group16-sha256`, `diffie-hellman-group16-sha384@ssh.com`, `diffie-hellman-group16-sha512@ssh.com`, `diffie-hellman-group18-sha512@ssh.com`
 
 signatures::
   `ssh-rsa`, `ssh-dss`, `ecdsa-sha2-nistp256`, `ssh-ed25519`
@@ -76,7 +84,7 @@ compression::
   `zlib` and `zlib@openssh.com` (delayed zlib)
 
 private key files::
-   `pkcs8` encoded (what openssh uses)
+   `pkcs5`, `pkcs8`, `openssh-key-v1`, `ssh-rsa-cert-v01@openssh.com`, `ssh-dsa-cert-v01@openssh.com`
 
 If you need something that is not included, it shouldn't be too hard to add (do contribute it!)
 
@@ -96,7 +104,46 @@ Google Group: http://groups.google.com/group/sshj-users
 Fork away!
 
 == Release history
-SSHJ 0.16.0 (2016-??-??)::
+SSHJ 0.21.1 (2017-04-25)::
+* Merged https://github.com/hierynomus/sshj/pulls/322[#322]: Fix regression from 40f956b (invalid length parameter on outputstream)
+SSHJ 0.21.0 (2017-04-14)::
+* Merged https://github.com/hierynomus/sshj/pulls/319[#319]: Added support for `ssh-rsa-cert-v01@openssh.com` and `ssh-dsa-cert-v01@openssh.com` certificate key files
+* Upgraded Gradle to 3.4.1
+* Merged https://github.com/hierynomus/sshj/pulls/305[#305]: Added support for custom string encoding
+* Fixed https://github.com/hierynomus/sshj/issues/312[#312]: Upgraded BouncyCastle to 1.56
+SSHJ 0.20.0 (2017-02-09)::
+* Merged https://github.com/hierynomus/sshj/pulls/294[#294]: Reference ED25519 by constant instead of name
+* Merged https://github.com/hierynomus/sshj/pulls/293[#293], https://github.com/hierynomus/sshj/pulls/295[#295] and https://github.com/hierynomus/sshj/pulls/301[#301]: Fixed OSGi packaging
+* Added new Diffie Hellman groups 15-18 for stronger KeyExchange algorithms
+SSHJ 0.19.1 (2016-12-30)::
+* Enabled PKCS5 Key files in DefaultConfig
+* Merged https://github.com/hierynomus/sshj/pulls/291[#291]: Fixed sshj.properties loading and chained exception messages
+* Merged https://github.com/hierynomus/sshj/pulls/284[#284]: Correctly catch interrupt in keepalive thread
+* Fixed https://github.com/hierynomus/sshj/issues/292[#292]: Pass the configured RandomFactory to Diffie Hellmann KEX
+* Fixed https://github.com/hierynomus/sshj/issues/256[#256]: SSHJ now builds if no git repository present
+* LocalPortForwarder now correctly interrupts its own thread on close()
+SSHJ 0.19.0 (2016-11-25)::
+* Fixed https://github.com/hierynomus/sshj/issues/276[#276]: Add support for ed-25519 and new OpenSSH key format
+* Fixed https://github.com/hierynomus/sshj/issues/280[#280]: Read version from a generated sshj.properties file to correctly output version during negotiation
+SSHJ 0.18.0 (2016-09-30)::
+* Fixed Android compatibility
+* Upgrade to Gradle 3.0
+* Merged https://github.com/hierynomus/sshj/pulls/271[#271]: Load known_hosts without requiring BouncyCastle
+* Merged https://github.com/hierynomus/sshj/pulls/269[#269]: Brought back Java6 support by popular demand
+* Merged https://github.com/hierynomus/sshj/pulls/267[#267]: Added support for per connection logging (Fixes https://github.com/hierynomus/sshj/issues/264[#264])
+* Merged https://github.com/hierynomus/sshj/pulls/262[#262], https://github.com/hierynomus/sshj/pulls/265[#265] and https://github.com/hierynomus/sshj/pulls/266[#266]: Added PKCS5 key file support
+* Fixed toString of sftp FileAttributes (Fixes https://github.com/hierynomus/sshj/pulls/258[#258])
+* Fixed https://github.com/hierynomus/sshj/issues/255[#255]: No longer depending on 'privately marked' classes in `net.i2p.crypto.eddsa.math` package, fixes OSGI dependencies
+SSHJ 0.17.2 (2016-07-07)::
+* Treating SSH Server identification line ending in '\n' instead of '\r\n' leniently.
+SSHJ 0.17.1 (2016-07-06)::
+* Improved parsing of the SSH Server identification. Too long header lines now no longer break the protocol.
+SSHJ 0.17.0 (2016-07-05)::
+* *Introduced breaking change in SFTP copy behaviour*: Previously an SFTP copy operation would behave differently if both source and target were folders with different names.
+  In this case instead of copying the contents of the source into the target directory, the directory itself was copied as a sub directory of the target directory.
+  This behaviour has been removed in favour of the default behaviour which is to copy the contents of the source into the target. Bringing the behaviour in line with how SCP works.
+* Fixed https://github.com/hierynomus/sshj/issues/252[#252] (via: https://github.com/hierynomus/sshj/pulls/253[#253]): Same name subdirs are no longer merged by accident
+SSHJ 0.16.0 (2016-04-11)::
 * Fixed https://github.com/hierynomus/sshj/issues/239[#239]: Remote port forwards did not work if you used the empty string as address, or a catch-all address.
 * Fixed https://github.com/hierynomus/sshj/issues/242[#242]: Added OSGI headers to sources jar manifest
 * Fixed https://github.com/hierynomus/sshj/issues/236[#236]: Remote Port forwarding with dynamic port allocation fails with BufferUnderflowException

build.gradle

@@ -1,198 +1,229 @@
+import java.text.SimpleDateFormat
+
 plugins {
-    id "java"
-    id "maven"
-    id "idea"
-    id "signing"
-    id "osgi"
-    id "org.ajoberstar.release-opinion" version "1.4.0-rc.1"
-    id "com.github.hierynomus.license" version "0.12.1"
+  id "java"
+  id "groovy"
+  id "osgi"
+  id "maven-publish"
+  id "org.ajoberstar.release-opinion" version "1.4.2"
+  id "com.github.hierynomus.license" version "0.12.1"
+  id "com.jfrog.bintray" version "1.7"
+  id 'ru.vyarus.pom' version '1.0.3'
+  id 'ru.vyarus.github-info' version '1.1.0'
 }
 
 group = "com.hierynomus"
+defaultTasks "build"
 
 repositories {
-    mavenCentral()
+  mavenCentral()
 }
 
-sourceCompatibility = 1.7
-targetCompatibility = 1.7
+sourceCompatibility = 1.6
+targetCompatibility = 1.6
 
 configurations.compile.transitive = false
 
-idea {
-    module {
-        downloadJavadoc = true
-        downloadSources = true
-    }
+def bouncycastleVersion = "1.56"
+
+dependencies {
+  compile "org.slf4j:slf4j-api:1.7.7"
+  compile "org.bouncycastle:bcprov-jdk15on:$bouncycastleVersion"
+  compile "org.bouncycastle:bcpkix-jdk15on:$bouncycastleVersion"
+  compile "com.jcraft:jzlib:1.1.3"
+
+  compile "net.i2p.crypto:eddsa:0.1.0"
+
+  testCompile "junit:junit:4.11"
+  testCompile 'org.spockframework:spock-core:1.0-groovy-2.4'
+  testCompile "org.mockito:mockito-core:1.9.5"
+  testCompile "org.apache.sshd:sshd-core:1.2.0"
+  testRuntime "ch.qos.logback:logback-classic:1.1.2"
+  testCompile 'org.glassfish.grizzly:grizzly-http-server:2.3.17'
+  testCompile 'org.apache.httpcomponents:httpclient:4.5.2'
+
 }
 
 license {
-    mapping {
-        java = 'SLASHSTAR_STYLE'
-    }
-    header rootProject.file('LICENSE_HEADER')
-    strictCheck true
+  header rootProject.file('LICENSE_HEADER')
+  strictCheck true
+  mapping {
+    java = 'SLASHSTAR_STYLE'
+  }
+  excludes(['**/djb/Curve25519.java', '**/sshj/common/Base64.java'])
 }
 
-release {
+if (project.file('.git').isDirectory()) {
+  release {
     grgit = org.ajoberstar.grgit.Grgit.open(project.projectDir)
-}
-
-test {
-    testLogging {
-        exceptionFormat = 'full'
-    }
-    include "**/*Test.*"
-    if (!project.hasProperty("allTests")) {
-        useJUnit {
-            excludeCategories 'com.hierynomus.sshj.test.SlowTests'
-            excludeCategories 'com.hierynomus.sshj.test.KnownFailingTests'
-        }
-    }
-
-    afterSuite { descriptor, result ->
-        if (descriptor.className != null) {
-            def indicator = "\u001B[32m✓\u001b[0m"
-            if (result.failedTestCount > 0) {
-                indicator = "\u001B[31m✘\u001b[0m"
-            }
-            logger.lifecycle("$indicator Test ${descriptor.name}; Executed: ${result.testCount}/\u001B[32m${result.successfulTestCount}\u001B[0m/\u001B[31m${result.failedTestCount}\u001B[0m")
-        }
-    }
-}
-
-def bouncycastleVersion = "1.51"
-
-dependencies {
-    compile "org.slf4j:slf4j-api:1.7.7"
-    compile "org.bouncycastle:bcprov-jdk15on:$bouncycastleVersion"
-    compile "org.bouncycastle:bcpkix-jdk15on:$bouncycastleVersion"
-    compile "com.jcraft:jzlib:1.1.3"
-
-    compile "net.vrallev.ecc:ecc-25519-java:1.0.1"
-
-    testCompile "junit:junit:4.11"
-    testCompile "org.mockito:mockito-core:1.9.5"
-    testCompile "org.apache.sshd:sshd-core:1.1.0"
-    testRuntime "ch.qos.logback:logback-classic:1.1.2"
-    testCompile 'org.glassfish.grizzly:grizzly-http-server:2.3.17'
-    testCompile 'org.apache.httpcomponents:httpclient:4.5.2'
-
-}
-
-jar {
-    manifest {
-        instruction "Bundle-Description", "SSHv2 library for Java"
-        instruction "Bundle-License", "http://www.apache.org/licenses/LICENSE-2.0.txt"
-        instruction "Import-Package", "!net.schmizz.*"
-        instruction "Import-Package", "javax.crypto*"
-        instruction "Import-Package", "net.i2p*"
-        instruction "Import-Package", "com.jcraft.jzlib*;version=\"[1.1,2)\";resolution:=optional"
-        instruction "Import-Package", "org.slf4j*;version=\"[1.7,5)\""
-        instruction "Import-Package", "org.bouncycastle*"
-        instruction "Import-Package", "*"
-        instruction "Export-Package", "net.schmizz.*"
-    }
-}
-
-task javadocJar(type: Jar) {
-    classifier = 'javadoc'
-    from javadoc
-}
-
-task sourcesJar(type: Jar) {
-    classifier = 'sources'
-    from sourceSets.main.allSource
-    manifest = project.tasks.jar.manifest
-}
-
-artifacts {
-    archives javadocJar, sourcesJar
-}
-
-signing {
-    required { !version.toString().contains("SNAPSHOT") && gradle.taskGraph.hasTask("uploadArchives") }
-    sign configurations.archives
+  }
+} else {
+  version = "0.0.0-no.git"
 }
 
 // This disables the pedantic doclint feature of JDK8
 if (JavaVersion.current().isJava8Compatible()) {
-    tasks.withType(Javadoc) {
-        options.addStringOption('Xdoclint:none', '-quiet')
-    }
+  tasks.withType(Javadoc) {
+    options.addStringOption('Xdoclint:none', '-quiet')
+  }
 }
 
-uploadArchives {
-    if (project.hasProperty('sonatypeUsername')) {
-        repositories.mavenDeployer {
-            beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
+task writeSshjVersionProperties {
+  doLast {
+    project.file("${project.buildDir}/resources/main").mkdirs()
+    project.file("${project.buildDir}/resources/main/sshj.properties").withWriter { w ->
+      w.append("sshj.version=${version}")
+    }
+  }
+}
 
-            configuration = configurations.archives
+jar.dependsOn writeSshjVersionProperties
 
-            repository(url: 'https://oss.sonatype.org/service/local/staging/deploy/maven2') {
-                authentication(userName: sonatypeUsername, password: sonatypePassword)
-            }
-            snapshotRepository(url: 'https://oss.sonatype.org/content/repositories/snapshots/') {
-                authentication(userName: sonatypeUsername, password: sonatypePassword)
-            }
+jar {
+  manifest {
+    // please see http://bnd.bndtools.org/chapters/390-wrapping.html
+    instruction "Bundle-Description", "SSHv2 library for Java"
+    instruction "Bundle-License", "http://www.apache.org/licenses/LICENSE-2.0.txt"
+    instruction "Import-Package", "!net.schmizz.*"
+    instruction "Import-Package", "!com.hierynomus.sshj.*"
+    instruction "Import-Package", "javax.crypto*"
+    instruction "Import-Package", "!net.i2p.crypto.eddsa.math"
+    instruction "Import-Package", "net.i2p*"
+    instruction "Import-Package", "com.jcraft.jzlib*;version=\"[1.1,2)\";resolution:=optional"
+    instruction "Import-Package", "org.slf4j*;version=\"[1.7,5)\""
+    instruction "Import-Package", "org.bouncycastle*;resolution:=optional"
+    instruction "Import-Package", "org.bouncycastle.jce.provider;resolution:=optional"
+    instruction "Import-Package", "*"
+    instruction "Export-Package", "com.hierynomus.sshj.*;version=\"${project.jar.manifest.version}\""
+    instruction "Export-Package", "net.schmizz.*;version=\"${project.jar.manifest.version}\""
+  }
+}
 
-            pom.project {
-                name "sshj"
-                description "SSHv2 library for Java"
-                url "https://github.com/hierynomus/sshj"
-                inceptionYear "2009"
+task javadocJar(type: Jar) {
+  classifier = 'javadoc'
+  from javadoc
+}
 
-                issueManagement {
-                    system "github"
-                    url "https://github.com/hierynomus/sshj/issues"
-                }
+task sourcesJar(type: Jar) {
+  classifier = 'sources'
+  from sourceSets.main.allSource
+  manifest {
+    attributes(
+      // Add the needed OSGI attributes
+      "Bundle-ManifestVersion": "2",
+      "Bundle-Name": "${project.jar.manifest.name} Source",
+      "Bundle-Version": project.jar.manifest.version,
+      "Eclipse-SourceBundle": "${project.jar.manifest.symbolicName};version=\"${project.jar.manifest.version}\";roots:=\".\"",
+      "Bundle-SymbolicName": "${project.jar.manifest.symbolicName}.source"
+    )
+  }
+}
 
-                scm {
-                    connection "scm:git:git://github.com/hierynomus/sshj.git"
-                    developerConnection "scm:git:git@github.com:hierynomus/sshj.git"
-                    url "https://github.com/hierynomus/sshj.git"
-                }
+tasks.withType(Test) {
+  testLogging {
+    exceptionFormat = 'full'
+  }
+  include "**/*Test.*"
+  include "**/*Spec.*"
+  if (!project.hasProperty("allTests")) {
+    useJUnit {
+      excludeCategories 'com.hierynomus.sshj.test.SlowTests'
+      excludeCategories 'com.hierynomus.sshj.test.KnownFailingTests'
+    }
+  }
 
-                licenses {
-                    license {
-                        name "Apache 2"
-                        url "http://www.apache.org/licenses/LICENSE-2.0.txt"
-                        distribution "repo"
-                    }
-                }
+  afterSuite { descriptor, result ->
+    if (descriptor.className != null) {
+      def indicator = "\u001B[32m✓\u001b[0m"
+      if (result.failedTestCount > 0) {
+        indicator = "\u001B[31m✘\u001b[0m"
+      }
+      logger.lifecycle("$indicator Test ${descriptor.name}; Executed: ${result.testCount}/\u001B[32m${result.successfulTestCount}\u001B[0m/\u001B[31m${result.failedTestCount}\u001B[0m")
+    }
+  }
+}
 
-                developers {
-                    developer {
-                        id "hierynomus"
-                        name "Jeroen van Erp"
-                        email "jeroen@javadude.nl"
-                        roles {
-                            role "Lead developer"
-                        }
-                    }
-                    developer {
-                        id "shikhar"
-                        name "Shikhar Bhushan"
-                        email "shikhar@schmizz.net"
-                        url "http://schmizz.net"
-                        roles {
-                            role "Previous lead developer"
-                        }
-                    }
-                    developer {
-                        id "iterate"
-                        name "David Kocher"
-                        email "dkocher@iterate.ch"
-                        organization "iterage GmbH"
-                        organizationUrl "https://iterate.ch"
-                        roles {
-                            role "Developer"
-                        }
-                    }
-                }
-            }
+project.tasks.compileGroovy.onlyIf { false }
+
+github {
+  user 'hierynomus'
+  license 'Apache'
+}
+
+pom {
+  description "SSHv2 library for Java"
+  url "https://github.com/hierynomus/sshj"
+  inceptionYear "2009"
+  developers {
+    developer {
+      id "hierynomus"
+      name "Jeroen van Erp"
+      email "jeroen@javadude.nl"
+      roles {
+        role "Lead developer"
+      }
+    }
+    developer {
+      id "shikhar"
+      name "Shikhar Bhushan"
+      email "shikhar@schmizz.net"
+      url "http://schmizz.net"
+      roles {
+        role "Previous lead developer"
+      }
+    }
+    developer {
+      id "iterate"
+      name "David Kocher"
+      email "dkocher@iterate.ch"
+      organization "iterage GmbH"
+      organizationUrl "https://iterate.ch"
+      roles {
+        role "Developer"
+      }
+    }
+  }
+}
+
+publishing.publications {
+  Sshj(MavenPublication) {
+    from components.java
+    artifact sourcesJar
+    artifact javadocJar
+  }
+}
+
+
+if (project.hasProperty("bintrayUsername") && project.hasProperty("bintrayApiKey")) {
+  bintray {
+    user = project.property("bintrayUsername")
+    key = project.property("bintrayApiKey")
+    publish = true
+    publications = ["Sshj"]
+    pkg {
+      repo = "maven"
+      name = project.name
+      licenses = ["Apache-2.0"]
+      vcsUrl = "https://github.com/hierynomus/sshj.git"
+      labels = ["ssh", "sftp", "secure-shell", "network", "file-transfer"]
+      githubRepo = "hierynomus/sshj"
+      version {
+        name = project.version.toString()
+        vcsTag = "v${project.version}"
+        released = new SimpleDateFormat('yyyy-MM-dd\'T\'HH:mm:ss.SSSZZ').format(new Date())
+        gpg {
+          sign = true
+          passphrase = project.property("signing.password")
         }
+        mavenCentralSync {
+          sync = true
+          user = project.property("sonatypeUsername")
+          password = project.property("sonatypePassword")
+          close = 1
+        }
+      }
     }
+  }
 }
 
-tasks.release.dependsOn 'build', 'uploadArchives'
+project.tasks.release.dependsOn([project.tasks.build, project.tasks.bintrayUpload])

examples/pom.xml

@@ -24,7 +24,7 @@
     <groupId>com.hierynomus</groupId>
     <artifactId>sshj-examples</artifactId>
     <packaging>jar</packaging>
-    <version>0.14.0</version>
+    <version>0.19.1</version>
 
     <name>sshj-examples</name>
     <description>Examples for SSHv2 library for Java</description>
@@ -55,7 +55,7 @@
         <dependency>
             <groupId>com.hierynomus</groupId>
             <artifactId>sshj</artifactId>
-            <version>0.15.0</version>
+            <version>0.19.0</version>
         </dependency>
     </dependencies>
 

examples/src/main/java/net/schmizz/sshj/examples/KeepAlive.java

@@ -3,14 +3,11 @@ package net.schmizz.sshj.examples;
 import net.schmizz.keepalive.KeepAliveProvider;
 import net.schmizz.sshj.DefaultConfig;
 import net.schmizz.sshj.SSHClient;
-import net.schmizz.sshj.common.IOUtils;
 import net.schmizz.sshj.connection.channel.direct.Session;
-import net.schmizz.sshj.connection.channel.direct.Session.Command;
 import net.schmizz.sshj.transport.verification.PromiscuousVerifier;
 
 import java.io.IOException;
 import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
 
 /** This examples demonstrates how to setup keep-alive to detect connection dropping. */
 public class KeepAlive {

examples/src/main/java/net/schmizz/sshj/examples/RudimentaryPTY.java

@@ -9,6 +9,7 @@ import net.schmizz.sshj.transport.verification.OpenSSHKnownHosts;
 
 import java.io.File;
 import java.io.IOException;
+import net.schmizz.sshj.common.LoggerFactory;
 
 /** A very rudimentary psuedo-terminal based on console I/O. */
 class RudimentaryPTY {
@@ -33,18 +34,18 @@ class RudimentaryPTY {
 
                 final Shell shell = session.startShell();
 
-                new StreamCopier(shell.getInputStream(), System.out)
+                new StreamCopier(shell.getInputStream(), System.out, LoggerFactory.DEFAULT)
                         .bufSize(shell.getLocalMaxPacketSize())
                         .spawn("stdout");
 
-                new StreamCopier(shell.getErrorStream(), System.err)
+                new StreamCopier(shell.getErrorStream(), System.err, LoggerFactory.DEFAULT)
                         .bufSize(shell.getLocalMaxPacketSize())
                         .spawn("stderr");
 
                 // Now make System.in act as stdin. To exit, hit Ctrl+D (since that results in an EOF on System.in)
                 // This is kinda messy because java only allows console input after you hit return
                 // But this is just an example... a GUI app could implement a proper PTY
-                new StreamCopier(System.in, shell.getOutputStream())
+                new StreamCopier(System.in, shell.getOutputStream(), LoggerFactory.DEFAULT)
                         .bufSize(shell.getRemoteMaxPacketSize())
                         .copy();
 

examples/src/main/java/net/schmizz/sshj/examples/X11.java

@@ -5,6 +5,7 @@ import net.schmizz.sshj.common.StreamCopier;
 import net.schmizz.sshj.connection.channel.direct.Session;
 import net.schmizz.sshj.connection.channel.direct.Session.Command;
 import net.schmizz.sshj.connection.channel.forwarded.SocketForwardingConnectListener;
+import net.schmizz.sshj.common.LoggerFactory;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;
@@ -42,8 +43,8 @@ public class X11 {
 
             final Command cmd = sess.exec("/usr/X11/bin/xcalc");
 
-            new StreamCopier(cmd.getInputStream(), System.out).spawn("stdout");
-            new StreamCopier(cmd.getErrorStream(), System.err).spawn("stderr");
+            new StreamCopier(cmd.getInputStream(), System.out, LoggerFactory.DEFAULT).spawn("stdout");
+            new StreamCopier(cmd.getErrorStream(), System.err, LoggerFactory.DEFAULT).spawn("stderr");
 
             // Wait for session & X11 channel to get closed
             ssh.getConnection().join();

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-all.zip

src/main/java/com/hierynomus/sshj/backport/Jdk7HttpProxySocket.java

@@ -18,7 +18,8 @@ package com.hierynomus.sshj.backport;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.*;
-import java.nio.charset.Charset;
+
+import net.schmizz.sshj.common.IOUtils;
 
 public class Jdk7HttpProxySocket extends Socket {
 
@@ -48,7 +49,7 @@ public class Jdk7HttpProxySocket extends Socket {
         }
         InetSocketAddress isa = (InetSocketAddress) endpoint;
         String httpConnect = "CONNECT " + isa.getHostName() + ":" + isa.getPort() + " HTTP/1.0\n\n";
-        getOutputStream().write(httpConnect.getBytes(Charset.forName("UTF-8")));
+        getOutputStream().write(httpConnect.getBytes(IOUtils.UTF8));
         checkAndFlushProxyResponse();
     }
 
@@ -61,7 +62,7 @@ public class Jdk7HttpProxySocket extends Socket {
             throw new SocketException("Empty response from proxy");
         }
 
-        String proxyResponse = new String(tmpBuffer, 0, len, "UTF-8");
+        String proxyResponse = new String(tmpBuffer, 0, len, IOUtils.UTF8);
 
         // Expecting HTTP/1.x 200 OK
         if (proxyResponse.contains("200")) {

src/main/java/com/hierynomus/sshj/signature/Ed25519PublicKey.java

@@ -23,6 +23,8 @@ import net.schmizz.sshj.common.SSHRuntimeException;
 
 import java.util.Arrays;
 
+import static net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable.CURVE_ED25519_SHA512;
+
 /**
  * Our own extension of the EdDSAPublicKey that comes from ECC-25519, as that class does not implement equality.
  * The code uses the equality of the keys as an indicator whether they're the same during host key verification.
@@ -32,7 +34,7 @@ public class Ed25519PublicKey extends EdDSAPublicKey {
     public Ed25519PublicKey(EdDSAPublicKeySpec spec) {
         super(spec);
 
-        EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName("ed25519-sha-512");
+        EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName(CURVE_ED25519_SHA512);
         if (!spec.getParams().getCurve().equals(ed25519.getCurve())) {
             throw new SSHRuntimeException("Cannot create Ed25519 Public Key from wrong spec");
         }

src/main/java/com/hierynomus/sshj/transport/IdentificationStringParser.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.transport;
+
+import net.schmizz.sshj.common.Buffer;
+import net.schmizz.sshj.common.ByteArrayUtils;
+import net.schmizz.sshj.common.LoggerFactory;
+import net.schmizz.sshj.transport.TransportException;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+public class IdentificationStringParser {
+    private final Logger log;
+    private final Buffer.PlainBuffer buffer;
+
+    private byte[] EXPECTED_START_BYTES = new byte[] {'S', 'S', 'H', '-'};
+
+    public IdentificationStringParser(Buffer.PlainBuffer buffer) {
+	this(buffer, LoggerFactory.DEFAULT);
+    }
+
+    public IdentificationStringParser(Buffer.PlainBuffer buffer, LoggerFactory loggerFactory) {
+        this.log = loggerFactory.getLogger(IdentificationStringParser.class);
+        this.buffer = buffer;
+    }
+
+    public String parseIdentificationString() throws IOException {
+        for (;;) {
+            Buffer.PlainBuffer lineBuffer = new Buffer.PlainBuffer();
+            int lineStartPos = buffer.rpos();
+            for (;;) {
+                if (buffer.available() == 0) {
+                    buffer.rpos(lineStartPos);
+                    return "";
+                }
+                byte b = buffer.readByte();
+                lineBuffer.putByte(b);
+                if (b == '\n') {
+                    if (checkForIdentification(lineBuffer)) {
+                        return readIdentification(lineBuffer);
+                    } else {
+                        logHeaderLine(lineBuffer);
+                    }
+                    break;
+                }
+            }
+        }
+    }
+
+    private void logHeaderLine(Buffer.PlainBuffer lineBuffer) throws Buffer.BufferException {
+        byte[] bytes = new byte[lineBuffer.available()];
+        lineBuffer.readRawBytes(bytes);
+        String header = new String(bytes, 0, bytes.length - 1);
+        log.debug("Received header: {}", header);
+    }
+
+    private String readIdentification(Buffer.PlainBuffer lineBuffer) throws Buffer.BufferException, TransportException {
+        byte[] bytes = new byte[lineBuffer.available()];
+        lineBuffer.readRawBytes(bytes);
+        if (bytes.length > 255) {
+            log.error("Incorrect identification String received, line was longer than expected: {}", new String(bytes));
+            log.error("Just for good measure, bytes were: {}", ByteArrayUtils.printHex(bytes, 0, bytes.length));
+            throw new TransportException("Incorrect identification: line too long: " + ByteArrayUtils.printHex(bytes, 0, bytes.length));
+        }
+        if (bytes[bytes.length - 2] != '\r') {
+            String ident = new String(bytes, 0, bytes.length - 1);
+            log.warn("Server identification has bad line ending, was expecting a '\\r\\n' however got: '{}' (hex: {})", (char) (bytes[bytes.length - 2] & 0xFF), Integer.toHexString(bytes[bytes.length - 2] & 0xFF));
+            log.warn("Will treat the identification of this server '{}' leniently", ident);
+            return ident;
+            // log.error("Data received up til here was: {}", new String(bytes));
+            // throw new TransportException("Incorrect identification: bad line ending: " + ByteArrayUtils.toHex(bytes, 0, bytes.length));
+        }
+
+        // Strip off the \r\n
+        return new String(bytes, 0, bytes.length - 2);
+    }
+
+    private boolean checkForIdentification(Buffer.PlainBuffer lineBuffer) throws Buffer.BufferException {
+        if (lineBuffer.available() < 4) {
+            return false;
+        }
+        byte[] buf = new byte[4];
+        lineBuffer.readRawBytes(buf);
+        // Reset
+        lineBuffer.rpos(0);
+        return Arrays.equals(EXPECTED_START_BYTES, buf);
+    }
+}

src/main/java/com/hierynomus/sshj/transport/cipher/BlockCiphers.java

@@ -28,6 +28,7 @@ import net.schmizz.sshj.transport.cipher.Cipher;
  *
  * Some of the Ciphers are still implemented in net.schmizz.sshj.transport.cipher.*. These are scheduled to be migrated to here.
  */
+@SuppressWarnings("PMD.MethodNamingConventions")
 public class BlockCiphers {
 
     public static final String COUNTER_MODE = "CTR";

src/main/java/com/hierynomus/sshj/transport/cipher/ExtendedBlockCiphers.java

@@ -25,6 +25,7 @@ import static com.hierynomus.sshj.transport.cipher.BlockCiphers.COUNTER_MODE;
  *
  * - http://tools.ietf.org/id/draft-kanno-secsh-camellia-01.txt
  */
+@SuppressWarnings("PMD.MethodNamingConventions")
 public class ExtendedBlockCiphers {
     public static BlockCiphers.Factory Camellia128CTR() {
         return new BlockCiphers.Factory(16, 128, "camellia128-ctr", "Camellia", COUNTER_MODE);

src/main/java/com/hierynomus/sshj/transport/cipher/StreamCipher.java

@@ -19,7 +19,6 @@ import net.schmizz.sshj.transport.cipher.BaseCipher;
 
 import java.security.InvalidAlgorithmParameterException;
 import java.security.InvalidKeyException;
-import java.security.SecureRandom;
 
 public class StreamCipher extends BaseCipher {
 
@@ -29,6 +28,6 @@ public class StreamCipher extends BaseCipher {
 
     @Override
     protected void initCipher(javax.crypto.Cipher cipher, Mode mode, byte[] key, byte[] iv) throws InvalidKeyException, InvalidAlgorithmParameterException {
-        cipher.init(getMode(mode), getKeySpec(key), new SecureRandom());
+        cipher.init(getMode(mode), getKeySpec(key));
     }
 }

src/main/java/com/hierynomus/sshj/transport/cipher/StreamCiphers.java

@@ -23,6 +23,7 @@ import net.schmizz.sshj.transport.cipher.Cipher;
  * - https://tools.ietf.org/html/rfc4253#section-6.3
  * - https://tools.ietf.org/html/rfc4345
  */
+@SuppressWarnings("PMD.MethodNamingConventions")
 public class StreamCiphers {
 
     public static Factory Arcfour() {

src/main/java/com/hierynomus/sshj/transport/kex/DHG.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.transport.kex;
+
+import net.schmizz.sshj.transport.digest.Digest;
+import net.schmizz.sshj.transport.kex.AbstractDHG;
+import net.schmizz.sshj.transport.kex.DH;
+import net.schmizz.sshj.transport.kex.DHBase;
+
+import javax.crypto.spec.DHParameterSpec;
+import java.math.BigInteger;
+import java.security.GeneralSecurityException;
+
+/**
+ *
+ */
+public class DHG extends AbstractDHG {
+    private BigInteger group;
+    private BigInteger generator;
+
+    public DHG(BigInteger group, BigInteger generator, Digest digest) {
+        super(new DH(), digest);
+        this.group = group;
+        this.generator = generator;
+    }
+
+    @Override
+    protected void initDH(DHBase dh) throws GeneralSecurityException {
+        dh.init(new DHParameterSpec(group, generator), trans.getConfig().getRandomFactory());
+    }
+}

src/main/java/com/hierynomus/sshj/transport/kex/DHGroups.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.transport.kex;
+
+import net.schmizz.sshj.transport.digest.*;
+import net.schmizz.sshj.transport.kex.KeyExchange;
+
+import java.math.BigInteger;
+
+import static net.schmizz.sshj.transport.kex.DHGroupData.*;
+import static net.schmizz.sshj.transport.kex.DHGroupData.P16;
+import static net.schmizz.sshj.transport.kex.DHGroupData.P18;
+
+/**
+ * Factory methods for Diffie Hellmann KEX algorithms based on MODP groups / Oakley Groups
+ *
+ * - https://tools.ietf.org/html/rfc4253
+ * - https://tools.ietf.org/html/draft-ietf-curdle-ssh-modp-dh-sha2-01
+ */
+@SuppressWarnings("PMD.MethodNamingConventions")
+public class DHGroups {
+
+    public static DHGroups.Factory Group1SHA1() {
+        return new DHGroups.Factory("diffie-hellman-group1-sha1", P1, G, new SHA1.Factory());
+    }
+
+    public static DHGroups.Factory Group14SHA1() {
+        return new DHGroups.Factory("diffie-hellman-group14-sha1", P14, G, new SHA1.Factory());
+    }
+
+    public static DHGroups.Factory Group14SHA256() {
+        return new DHGroups.Factory("diffie-hellman-group14-sha256", P14, G, new SHA256.Factory());
+    }
+
+    public static DHGroups.Factory Group15SHA512() {
+        return new DHGroups.Factory("diffie-hellman-group15-sha512", P15, G, new SHA512.Factory());
+    }
+
+    public static DHGroups.Factory Group16SHA512() {
+        return new DHGroups.Factory("diffie-hellman-group16-sha512", P16, G, new SHA512.Factory());
+    }
+
+    public static DHGroups.Factory Group17SHA512() {
+        return new DHGroups.Factory("diffie-hellman-group17-sha512", P17, G, new SHA512.Factory());
+    }
+
+    public static DHGroups.Factory Group18SHA512() {
+        return new DHGroups.Factory("diffie-hellman-group18-sha512", P18, G, new SHA512.Factory());
+    }
+
+    /**
+     * Named factory for DHG1 key exchange
+     */
+    public static class Factory
+            implements net.schmizz.sshj.common.Factory.Named<KeyExchange> {
+
+        private String name;
+        private BigInteger group;
+        private BigInteger generator;
+        private Factory.Named<Digest> digestFactory;
+
+        public Factory(String name, BigInteger group, BigInteger generator, Named<Digest> digestFactory) {
+            this.name = name;
+            this.group = group;
+            this.generator = generator;
+            this.digestFactory = digestFactory;
+        }
+
+        @Override
+        public KeyExchange create() {
+            return new DHG(group, generator, digestFactory.create());
+        }
+
+        @Override
+        public String getName() {
+            return name;
+        }
+    }
+
+}

src/main/java/com/hierynomus/sshj/transport/kex/ExtendedDHGroups.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.transport.kex;
+
+import net.schmizz.sshj.transport.digest.SHA256;
+import net.schmizz.sshj.transport.digest.SHA384;
+import net.schmizz.sshj.transport.digest.SHA512;
+
+import static net.schmizz.sshj.transport.kex.DHGroupData.*;
+
+/**
+ * Set of KEX methods that are not in official RFCs but are supported by some SSH servers.
+ */
+@SuppressWarnings("PMD.MethodNamingConventions")
+public class ExtendedDHGroups {
+    public static DHGroups.Factory Group14SHA256AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group14-sha256@ssh.com", P14, G, new SHA256.Factory());
+    }
+
+    public static DHGroups.Factory Group15SHA256() {
+        return new DHGroups.Factory("diffie-hellman-group15-sha256", P15, G, new SHA256.Factory());
+    }
+
+    public static DHGroups.Factory Group15SHA256AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group15-sha256@ssh.com", P15, G, new SHA256.Factory());
+    }
+
+    public static DHGroups.Factory Group15SHA384AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group15-sha384@ssh.com", P15, G, new SHA384.Factory());
+    }
+
+    public static DHGroups.Factory Group16SHA256() {
+        return new DHGroups.Factory("diffie-hellman-group16-sha256", P16, G, new SHA256.Factory());
+    }
+
+    public static DHGroups.Factory Group16SHA384AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group16-sha384@ssh.com", P16, G, new SHA384.Factory());
+    }
+
+    public static DHGroups.Factory Group16SHA512AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group16-sha512@ssh.com", P16, G, new SHA512.Factory());
+    }
+
+    public static DHGroups.Factory Group18SHA512AtSSH() {
+        return new DHGroups.Factory("diffie-hellman-group18-sha512@ssh.com", P18, G, new SHA512.Factory());
+    }
+}

src/main/java/com/hierynomus/sshj/userauth/certificate/Certificate.java

@@ -0,0 +1,258 @@
+package com.hierynomus.sshj.userauth.certificate;
+
+import java.math.BigInteger;
+import java.security.PublicKey;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * Certificate wrapper for public keys, created to help implement
+ * protocol described here:
+ *
+ * https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?annotate=HEAD
+ *
+ * Consumed primarily by net.shmizz.sshj.common.KeyType
+ *
+ * @param <T> inner public key type
+ */
+public class Certificate<T extends PublicKey> implements PublicKey {
+    private static final long serialVersionUID = 1L;
+
+    private final T publicKey;
+    private final byte[] nonce;
+    private final BigInteger serial;
+    private final long type;
+    private final String id;
+    private final List<String> validPrincipals;
+    private final Date validAfter;
+    private final Date validBefore;
+    private final Map<String, String> critOptions;
+    private final Map<String, String> extensions;
+    private final byte[] signatureKey;
+    private final byte[] signature;
+
+    Certificate(Builder<T> builder) {
+        this.publicKey = builder.getPublicKey();
+        this.nonce = builder.getNonce();
+        this.serial = builder.getSerial();
+        this.type = builder.getType();
+        this.id = builder.getId();
+        this.validPrincipals = builder.getValidPrincipals();
+        this.validAfter = builder.getValidAfter();
+        this.validBefore = builder.getValidBefore();
+        this.critOptions = builder.getCritOptions();
+        this.extensions = builder.getExtensions();
+        this.signatureKey = builder.getSignatureKey();
+        this.signature = builder.getSignature();
+    }
+
+    public static <P extends PublicKey> Builder<P> getBuilder() {
+        return new Builder<P>();
+    }
+
+    public byte[] getNonce() {
+        return nonce;
+    }
+
+    public BigInteger getSerial() {
+        return serial;
+    }
+
+    public long getType() {
+        return type;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public List<String> getValidPrincipals() {
+        return validPrincipals;
+    }
+
+    public Date getValidAfter() {
+        return validAfter;
+    }
+
+    public Date getValidBefore() {
+        return validBefore;
+    }
+
+    public Map<String, String> getCritOptions() {
+        return critOptions;
+    }
+
+    public Map<String, String> getExtensions() {
+        return extensions;
+    }
+
+    public byte[] getSignatureKey() {
+        return signatureKey;
+    }
+
+    public byte[] getSignature() {
+        return signature;
+    }
+
+    public T getKey() {
+        return publicKey;
+    }
+
+    @Override
+    public byte[] getEncoded() {
+        return publicKey.getEncoded();
+    }
+
+    @Override
+    public String getAlgorithm() {
+        return publicKey.getAlgorithm();
+    }
+
+    @Override
+    public String getFormat() {
+        return publicKey.getFormat();
+    }
+
+    public static class Builder<T extends PublicKey> {
+        private T publicKey;
+        private byte[] nonce;
+        private BigInteger serial;
+        private long type;
+        private String id;
+        private List<String> validPrincipals;
+        private Date validAfter;
+        private Date validBefore;
+        private Map<String, String> critOptions;
+        private Map<String, String> extensions;
+        private byte[] signatureKey;
+        private byte[] signature;
+
+        public Certificate<T> build() {
+            return new Certificate<T>(this);
+        }
+
+        public T getPublicKey() {
+            return publicKey;
+        }
+
+        public Builder<T> publicKey(T publicKey) {
+            this.publicKey = publicKey;
+            return this;
+        }
+
+        public byte[] getNonce() {
+            return nonce;
+        }
+
+        public Builder<T> nonce(byte[] nonce) {
+            this.nonce = nonce;
+            return this;
+        }
+
+        public BigInteger getSerial() {
+            return serial;
+        }
+
+        public Builder<T> serial(BigInteger serial) {
+            this.serial = serial;
+            return this;
+        }
+
+        public long getType() {
+            return type;
+        }
+
+        public Builder<T> type(long type) {
+            this.type = type;
+            return this;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public Builder<T> id(String id) {
+            this.id = id;
+            return this;
+        }
+
+        public List<String> getValidPrincipals() {
+            return validPrincipals;
+        }
+
+        public Builder<T> validPrincipals(List<String> validPrincipals) {
+            this.validPrincipals = validPrincipals;
+            return this;
+        }
+
+        public Date getValidAfter() {
+            return validAfter;
+        }
+
+        public Builder<T> validAfter(Date validAfter) {
+            this.validAfter = validAfter;
+            return this;
+        }
+
+        public Date getValidBefore() {
+            return validBefore;
+        }
+
+        public Builder<T> validBefore(Date validBefore) {
+            this.validBefore = validBefore;
+            return this;
+        }
+
+        public Map<String, String> getCritOptions() {
+            return critOptions;
+        }
+
+        public Builder<T> critOptions(Map<String, String> critOptions) {
+            this.critOptions = critOptions;
+            return this;
+        }
+
+        public Map<String, String> getExtensions() {
+            return extensions;
+        }
+
+        public Builder<T> extensions(Map<String, String> extensions) {
+            this.extensions = extensions;
+            return this;
+        }
+
+        public byte[] getSignatureKey() {
+            return signatureKey;
+        }
+
+        public Builder<T> signatureKey(byte[] signatureKey) {
+            this.signatureKey = signatureKey;
+            return this;
+        }
+
+        public byte[] getSignature() {
+            return signature;
+        }
+
+        public Builder<T> signature(byte[] signature) {
+            this.signature = signature;
+            return this;
+        }
+    }
+}

src/main/java/com/hierynomus/sshj/userauth/keyprovider/OpenSSHKeyV1KeyFile.java

@@ -0,0 +1,160 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.userauth.keyprovider;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.security.KeyPair;
+import java.security.PublicKey;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import net.i2p.crypto.eddsa.EdDSAPrivateKey;
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
+import net.i2p.crypto.eddsa.spec.EdDSAPrivateKeySpec;
+import net.schmizz.sshj.common.*;
+import net.schmizz.sshj.common.Buffer.PlainBuffer;
+import net.schmizz.sshj.userauth.keyprovider.BaseFileKeyProvider;
+import net.schmizz.sshj.userauth.keyprovider.FileKeyProvider;
+import net.schmizz.sshj.userauth.keyprovider.KeyFormat;
+
+import static net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable.CURVE_ED25519_SHA512;
+
+/**
+ * Reads a key file in the new OpenSSH format.
+ * The format is described in the following document: https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key
+ */
+public class OpenSSHKeyV1KeyFile extends BaseFileKeyProvider {
+    private static final Logger logger = LoggerFactory.getLogger(OpenSSHKeyV1KeyFile.class);
+    private static final String BEGIN = "-----BEGIN ";
+    private static final String END = "-----END ";
+    private static final byte[] AUTH_MAGIC = "openssh-key-v1\0".getBytes();
+    public static final String OPENSSH_PRIVATE_KEY = "OPENSSH PRIVATE KEY-----";
+
+    public static class Factory
+            implements net.schmizz.sshj.common.Factory.Named<FileKeyProvider> {
+
+        @Override
+        public FileKeyProvider create() {
+            return new OpenSSHKeyV1KeyFile();
+        }
+
+        @Override
+        public String getName() {
+            return KeyFormat.OpenSSHv1.name();
+        }
+    }
+
+    @Override
+    protected KeyPair readKeyPair() throws IOException {
+        BufferedReader reader = new BufferedReader(resource.getReader());
+        try {
+            if (!checkHeader(reader)) {
+                throw new IOException("This key is not in 'openssh-key-v1' format");
+            }
+
+            String keyFile = readKeyFile(reader);
+            byte[] decode = Base64.decode(keyFile);
+            PlainBuffer keyBuffer = new PlainBuffer(decode);
+            return readDecodedKeyPair(keyBuffer);
+
+        } catch (GeneralSecurityException e) {
+            throw new SSHRuntimeException(e);
+        } finally {
+            IOUtils.closeQuietly(reader);
+        }
+    }
+
+    private KeyPair readDecodedKeyPair(final PlainBuffer keyBuffer) throws IOException, GeneralSecurityException {
+        byte[] bytes = new byte[AUTH_MAGIC.length];
+        keyBuffer.readRawBytes(bytes); // byte[] AUTH_MAGIC
+        if (!ByteArrayUtils.equals(bytes, 0, AUTH_MAGIC, 0, AUTH_MAGIC.length)) {
+            throw new IOException("This key does not contain the 'openssh-key-v1' format magic header");
+        }
+
+        String cipherName = keyBuffer.readString(); // string ciphername
+        String kdfName = keyBuffer.readString(); // string kdfname
+        String kdfOptions = keyBuffer.readString(); // string kdfoptions
+
+        int nrKeys = keyBuffer.readUInt32AsInt(); // int number of keys N; Should be 1
+        if (nrKeys != 1) {
+            throw new IOException("We don't support having more than 1 key in the file (yet).");
+        }
+        PublicKey publicKey = readPublicKey(new PlainBuffer(keyBuffer.readBytes())); // string publickey1
+        PlainBuffer privateKeyBuffer = new PlainBuffer(keyBuffer.readBytes()); // string (possibly) encrypted, padded list of private keys
+        if ("none".equals(cipherName)) {
+            logger.debug("Reading unencrypted keypair");
+            return readUnencrypted(privateKeyBuffer, publicKey);
+        } else {
+            logger.info("Keypair is encrypted with: " + cipherName + ", " + kdfName + ", " + kdfOptions);
+            throw new IOException("Cannot read encrypted keypair with " + cipherName + " yet.");
+        }
+    }
+
+    private PublicKey readPublicKey(final PlainBuffer plainBuffer) throws Buffer.BufferException, GeneralSecurityException {
+        return KeyType.fromString(plainBuffer.readString()).readPubKeyFromBuffer(plainBuffer);
+    }
+
+    private String readKeyFile(final BufferedReader reader) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        String line = reader.readLine();
+        while (!line.startsWith(END)) {
+            sb.append(line);
+            line = reader.readLine();
+        }
+        return sb.toString();
+    }
+
+    private boolean checkHeader(final BufferedReader reader) throws IOException {
+        String line = reader.readLine();
+        while (line != null && !line.startsWith(BEGIN)) {
+            line = reader.readLine();
+        }
+        line = line.substring(BEGIN.length());
+        return line.startsWith(OPENSSH_PRIVATE_KEY);
+    }
+
+    private KeyPair readUnencrypted(final PlainBuffer keyBuffer, final PublicKey publicKey) throws IOException, GeneralSecurityException {
+        int privKeyListSize = keyBuffer.available();
+        if (privKeyListSize % 8 != 0) {
+            throw new IOException("The private key section must be a multiple of the block size (8)");
+        }
+        int checkInt1 = keyBuffer.readUInt32AsInt(); // uint32 checkint1
+        int checkInt2 = keyBuffer.readUInt32AsInt(); // uint32 checkint2
+        if (checkInt1 != checkInt2) {
+            throw new IOException("The checkInts differed, the key was not correctly decoded.");
+        }
+        // The private key section contains both the public key and the private key
+        String keyType = keyBuffer.readString(); // string keytype
+        logger.info("Read key type: {}", keyType);
+
+        byte[] pubKey = keyBuffer.readBytes(); // string publickey (again...)
+        keyBuffer.readUInt32();
+        byte[] privKey = new byte[32];
+        keyBuffer.readRawBytes(privKey); // string privatekey
+        keyBuffer.readRawBytes(new byte[32]); // string publickey (again...)
+        String comment = keyBuffer.readString(); // string comment
+        byte[] padding = new byte[keyBuffer.available()];
+        keyBuffer.readRawBytes(padding); // char[] padding
+        for (int i = 0; i < padding.length; i++) {
+            if ((int) padding[i] != i + 1) {
+                throw new IOException("Padding of key format contained wrong byte at position: " + i);
+            }
+        }
+        return new KeyPair(publicKey, new EdDSAPrivateKey(new EdDSAPrivateKeySpec(privKey, EdDSANamedCurveTable.getByName(CURVE_ED25519_SHA512))));
+    }
+}

src/main/java/djb/Curve25519.java

@@ -0,0 +1,918 @@
+/* Ported from C to Java by Dmitry Skiba [sahn0], 23/02/08.
+ * Original: http://cds.xs4all.nl:8081/ecdh/
+ */
+/* Generic 64-bit integer implementation of Curve25519 ECDH
+ * Written by Matthijs van Duin, 200608242056
+ * Public domain.
+ *
+ * Based on work by Daniel J Bernstein, http://cr.yp.to/ecdh.html
+ */
+package djb;
+
+public class Curve25519 {
+
+	/* key size */
+	public static final int KEY_SIZE = 32;
+	
+	/* 0 */
+	public static final byte[] ZERO = {
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+	};
+	
+	/* the prime 2^255-19 */
+	public static final byte[] PRIME = {
+		(byte)237, (byte)255, (byte)255, (byte)255,
+		(byte)255, (byte)255, (byte)255, (byte)255,
+		(byte)255, (byte)255, (byte)255, (byte)255,
+		(byte)255, (byte)255, (byte)255, (byte)255,
+		(byte)255, (byte)255, (byte)255, (byte)255,
+		(byte)255, (byte)255, (byte)255, (byte)255,
+	    (byte)255, (byte)255, (byte)255, (byte)255,
+	    (byte)255, (byte)255, (byte)255, (byte)127
+	};
+	
+	/* group order (a prime near 2^252+2^124) */
+	public static final byte[] ORDER = {
+		(byte)237, (byte)211, (byte)245, (byte)92,
+		(byte)26,  (byte)99,  (byte)18,  (byte)88,
+		(byte)214, (byte)156, (byte)247, (byte)162,
+		(byte)222, (byte)249, (byte)222, (byte)20,
+		(byte)0,   (byte)0,   (byte)0,   (byte)0, 
+		(byte)0,   (byte)0,   (byte)0,   (byte)0,
+		(byte)0,   (byte)0,   (byte)0,   (byte)0, 
+		(byte)0,   (byte)0,   (byte)0,   (byte)16
+	};
+	
+	/********* KEY AGREEMENT *********/
+	
+	/* Private key clamping
+	 *   k [out] your private key for key agreement
+	 *   k  [in]  32 random bytes
+	 */
+	public static final void clamp(byte[] k) {
+		k[31] &= 0x7F;
+		k[31] |= 0x40;
+		k[ 0] &= 0xF8;
+	}
+	
+	/* Key-pair generation
+	 *   P  [out] your public key
+	 *   s  [out] your private key for signing
+	 *   k  [out] your private key for key agreement
+	 *   k  [in]  32 random bytes
+	 * s may be NULL if you don't care
+	 *
+	 * WARNING: if s is not NULL, this function has data-dependent timing */
+	public static final void keygen(byte[] P, byte[] s, byte[] k) {
+		clamp(k);
+		core(P, s, k, null);
+	}
+
+	/* Key agreement
+	 *   Z  [out] shared secret (needs hashing before use)
+	 *   k  [in]  your private key for key agreement
+	 *   P  [in]  peer's public key
+	 */
+	public static final void curve(byte[] Z, byte[] k, byte[] P) {
+		core(Z, null, k, P);
+	}
+	
+	/********* DIGITAL SIGNATURES *********/
+
+	/* deterministic EC-KCDSA
+	 *
+	 *    s is the private key for signing
+	 *    P is the corresponding public key
+	 *    Z is the context data (signer public key or certificate, etc)
+	 *
+	 * signing:
+	 *
+	 *    m = hash(Z, message)
+	 *    x = hash(m, s)
+	 *    keygen25519(Y, NULL, x);
+	 *    r = hash(Y);
+	 *    h = m XOR r
+	 *    sign25519(v, h, x, s);
+	 *
+	 *    output (v,r) as the signature
+	 *
+	 * verification:
+	 *
+	 *    m = hash(Z, message);
+	 *    h = m XOR r
+	 *    verify25519(Y, v, h, P)
+	 *
+	 *    confirm  r == hash(Y)
+	 *
+	 * It would seem to me that it would be simpler to have the signer directly do 
+	 * h = hash(m, Y) and send that to the recipient instead of r, who can verify 
+	 * the signature by checking h == hash(m, Y).  If there are any problems with 
+	 * such a scheme, please let me know.
+	 *
+	 * Also, EC-KCDSA (like most DS algorithms) picks x random, which is a waste of 
+	 * perfectly good entropy, but does allow Y to be calculated in advance of (or 
+	 * parallel to) hashing the message.
+	 */
+	
+	/* Signature generation primitive, calculates (x-h)s mod q
+	 *   v  [out] signature value
+	 *   h  [in]  signature hash (of message, signature pub key, and context data)
+	 *   x  [in]  signature private key
+	 *   s  [in]  private key for signing
+	 * returns true on success, false on failure (use different x or h)
+	 */
+	public static final boolean sign(byte[] v, byte[] h, byte[] x, byte[] s) {
+		// v = (x - h) s  mod q
+		int w, i;
+		byte[] h1 = new byte[32], x1 = new byte[32];
+		byte[] tmp1 = new byte[64];
+		byte[] tmp2 = new byte[64];
+
+		// Don't clobber the arguments, be nice!
+		cpy32(h1, h);
+		cpy32(x1, x);
+
+		// Reduce modulo group order
+		byte[] tmp3=new byte[32];
+		divmod(tmp3, h1, 32, ORDER, 32);
+		divmod(tmp3, x1, 32, ORDER, 32);
+
+		// v = x1 - h1
+		// If v is negative, add the group order to it to become positive.
+		// If v was already positive we don't have to worry about overflow
+		// when adding the order because v < ORDER and 2*ORDER < 2^256
+		mula_small(v, x1, 0, h1, 32, -1);
+		mula_small(v, v , 0, ORDER, 32, 1);
+
+		// tmp1 = (x-h)*s mod q
+		mula32(tmp1, v, s, 32, 1);
+		divmod(tmp2, tmp1, 64, ORDER, 32);
+
+		for (w = 0, i = 0; i < 32; i++)
+			w |= v[i] = tmp1[i];
+		return w != 0;
+	}
+
+	/* Signature verification primitive, calculates Y = vP + hG
+	 *   Y  [out] signature public key
+	 *   v  [in]  signature value
+	 *   h  [in]  signature hash
+	 *   P  [in]  public key
+	 */
+	public static final void verify(byte[] Y, byte[] v, byte[] h, byte[] P) {
+		/* Y = v abs(P) + h G  */
+		byte[] d=new byte[32];
+	    long10[] 
+	        p=new long10[]{new long10(),new long10()},
+	    	s=new long10[]{new long10(),new long10()},
+		    yx=new long10[]{new long10(),new long10(),new long10()},
+		    yz=new long10[]{new long10(),new long10(),new long10()},
+		    t1=new long10[]{new long10(),new long10(),new long10()},
+		    t2=new long10[]{new long10(),new long10(),new long10()};
+		
+		int vi = 0, hi = 0, di = 0, nvh=0, i, j, k;
+
+		/* set p[0] to G and p[1] to P  */
+
+		set(p[0], 9);
+		unpack(p[1], P);
+
+		/* set s[0] to P+G and s[1] to P-G  */
+
+		/* s[0] = (Py^2 + Gy^2 - 2 Py Gy)/(Px - Gx)^2 - Px - Gx - 486662  */
+		/* s[1] = (Py^2 + Gy^2 + 2 Py Gy)/(Px - Gx)^2 - Px - Gx - 486662  */
+
+		x_to_y2(t1[0], t2[0], p[1]);	/* t2[0] = Py^2  */
+		sqrt(t1[0], t2[0]);	/* t1[0] = Py or -Py  */
+		j = is_negative(t1[0]);		/*      ... check which  */
+		t2[0]._0 += 39420360;		/* t2[0] = Py^2 + Gy^2  */
+		mul(t2[1], BASE_2Y, t1[0]);/* t2[1] = 2 Py Gy or -2 Py Gy  */
+		sub(t1[j], t2[0], t2[1]);	/* t1[0] = Py^2 + Gy^2 - 2 Py Gy  */
+		add(t1[1-j], t2[0], t2[1]);/* t1[1] = Py^2 + Gy^2 + 2 Py Gy  */
+		cpy(t2[0], p[1]);		/* t2[0] = Px  */
+		t2[0]._0 -= 9;			/* t2[0] = Px - Gx  */
+		sqr(t2[1], t2[0]);		/* t2[1] = (Px - Gx)^2  */
+		recip(t2[0], t2[1], 0);	/* t2[0] = 1/(Px - Gx)^2  */
+		mul(s[0], t1[0], t2[0]);	/* s[0] = t1[0]/(Px - Gx)^2  */
+		sub(s[0], s[0], p[1]);	/* s[0] = t1[0]/(Px - Gx)^2 - Px  */
+		s[0]._0 -= 9 + 486662;		/* s[0] = X(P+G)  */
+		mul(s[1], t1[1], t2[0]);	/* s[1] = t1[1]/(Px - Gx)^2  */
+		sub(s[1], s[1], p[1]);	/* s[1] = t1[1]/(Px - Gx)^2 - Px  */
+		s[1]._0 -= 9 + 486662;		/* s[1] = X(P-G)  */
+		mul_small(s[0], s[0], 1);	/* reduce s[0] */
+		mul_small(s[1], s[1], 1);	/* reduce s[1] */
+
+
+		/* prepare the chain  */
+		for (i = 0; i < 32; i++) {
+			vi = (vi >> 8) ^ (v[i] & 0xFF) ^ ((v[i] & 0xFF) << 1);
+			hi = (hi >> 8) ^ (h[i] & 0xFF) ^ ((h[i] & 0xFF) << 1);
+			nvh = ~(vi ^ hi);
+			di = (nvh & (di & 0x80) >> 7) ^ vi;
+			di ^= nvh & (di & 0x01) << 1;
+			di ^= nvh & (di & 0x02) << 1;
+			di ^= nvh & (di & 0x04) << 1;
+			di ^= nvh & (di & 0x08) << 1;
+			di ^= nvh & (di & 0x10) << 1;
+			di ^= nvh & (di & 0x20) << 1;
+			di ^= nvh & (di & 0x40) << 1;
+			d[i] = (byte)di;
+		}
+
+		di = ((nvh & (di & 0x80) << 1) ^ vi) >> 8;
+
+		/* initialize state */
+		set(yx[0], 1);
+		cpy(yx[1], p[di]);
+		cpy(yx[2], s[0]);
+		set(yz[0], 0);
+		set(yz[1], 1);
+		set(yz[2], 1);
+
+		/* y[0] is (even)P + (even)G
+		 * y[1] is (even)P + (odd)G  if current d-bit is 0
+		 * y[1] is (odd)P + (even)G  if current d-bit is 1
+		 * y[2] is (odd)P + (odd)G
+		 */
+
+		vi = 0;
+		hi = 0;
+
+		/* and go for it! */
+		for (i = 32; i--!=0; ) {
+			vi = (vi << 8) | (v[i] & 0xFF);
+			hi = (hi << 8) | (h[i] & 0xFF);
+			di = (di << 8) | (d[i] & 0xFF);
+
+			for (j = 8; j--!=0; ) {
+				mont_prep(t1[0], t2[0], yx[0], yz[0]);
+				mont_prep(t1[1], t2[1], yx[1], yz[1]);
+				mont_prep(t1[2], t2[2], yx[2], yz[2]);
+
+				k = ((vi ^ vi >> 1) >> j & 1)
+				  + ((hi ^ hi >> 1) >> j & 1);
+				mont_dbl(yx[2], yz[2], t1[k], t2[k], yx[0], yz[0]);
+
+				k = (di >> j & 2) ^ ((di >> j & 1) << 1);
+				mont_add(t1[1], t2[1], t1[k], t2[k], yx[1], yz[1],
+						p[di >> j & 1]);
+
+				mont_add(t1[2], t2[2], t1[0], t2[0], yx[2], yz[2],
+						s[((vi ^ hi) >> j & 2) >> 1]);
+			}
+		}
+
+		k = (vi & 1) + (hi & 1);
+		recip(t1[0], yz[k], 0);
+		mul(t1[1], yx[k], t1[0]);
+
+		pack(t1[1], Y);
+	}
+	
+	/////////////////////////////////////////////////////////////////////////// 
+	
+	/* sahn0:
+	 * Using this class instead of long[10] to avoid bounds checks. */
+	private static final class long10 {
+		public long10() {}
+		public long10(
+			long _0, long _1, long _2, long _3, long _4,
+			long _5, long _6, long _7, long _8, long _9)
+		{
+			this._0=_0; this._1=_1; this._2=_2;
+			this._3=_3; this._4=_4; this._5=_5;
+			this._6=_6; this._7=_7; this._8=_8;
+			this._9=_9;
+		}
+		public long _0,_1,_2,_3,_4,_5,_6,_7,_8,_9;
+	}
+	
+	/********************* radix 2^8 math *********************/
+	
+	private static final void cpy32(byte[] d, byte[] s) {
+		int i;
+		for (i = 0; i < 32; i++)
+			d[i] = s[i];
+	}
+	
+	/* p[m..n+m-1] = q[m..n+m-1] + z * x */
+	/* n is the size of x */
+	/* n+m is the size of p and q */
+	private static final int mula_small(byte[] p,byte[] q,int m,byte[] x,int n,int z) {
+		int v=0;
+		for (int i=0;i<n;++i) {
+			v+=(q[i+m] & 0xFF)+z*(x[i] & 0xFF);
+			p[i+m]=(byte)v;
+			v>>=8;
+		}
+		return v;		
+	}
+	
+	/* p += x * y * z  where z is a small integer
+	 * x is size 32, y is size t, p is size 32+t
+	 * y is allowed to overlap with p+32 if you don't care about the upper half  */
+	private static final int mula32(byte[] p, byte[] x, byte[] y, int t, int z) {
+		final int n = 31;
+		int w = 0;
+		int i = 0;
+		for (; i < t; i++) {
+			int zy = z * (y[i] & 0xFF);
+			w += mula_small(p, p, i, x, n, zy) +
+				(p[i+n] & 0xFF) + zy * (x[n] & 0xFF);
+			p[i+n] = (byte)w;
+			w >>= 8;
+		}
+		p[i+n] = (byte)(w + (p[i+n] & 0xFF));
+		return w >> 8;
+	}
+	
+	/* divide r (size n) by d (size t), returning quotient q and remainder r
+	 * quotient is size n-t+1, remainder is size t
+	 * requires t > 0 && d[t-1] != 0
+	 * requires that r[-1] and d[-1] are valid memory locations
+	 * q may overlap with r+t */
+	private static final void divmod(byte[] q, byte[] r, int n, byte[] d, int t) {
+		int rn = 0;
+		int dt = ((d[t-1] & 0xFF) << 8);
+		if (t>1) {
+			dt |= (d[t-2] & 0xFF);
+		}
+		while (n-- >= t) {
+			int z = (rn << 16) | ((r[n] & 0xFF) << 8);
+			if (n>0) {
+				z |= (r[n-1] & 0xFF);
+			}
+			z/=dt;
+			rn += mula_small(r,r, n-t+1, d, t, -z);
+			q[n-t+1] = (byte)((z + rn) & 0xFF); /* rn is 0 or -1 (underflow) */
+			mula_small(r,r, n-t+1, d, t, -rn);
+			rn = (r[n] & 0xFF);
+			r[n] = 0;
+		}
+		r[t-1] = (byte)rn;
+	}
+	
+	private static final int numsize(byte[] x,int n) {
+		while (n--!=0 && x[n]==0)
+			;
+		return n+1;
+	}
+	
+	/* Returns x if a contains the gcd, y if b.
+	 * Also, the returned buffer contains the inverse of a mod b,
+	 * as 32-byte signed.
+	 * x and y must have 64 bytes space for temporary use.
+	 * requires that a[-1] and b[-1] are valid memory locations  */
+	private static final byte[] egcd32(byte[] x,byte[] y,byte[] a,byte[] b) {
+		int an, bn = 32, qn, i;
+		for (i = 0; i < 32; i++)
+			x[i] = y[i] = 0;
+		x[0] = 1;
+		an = numsize(a, 32);
+		if (an==0)
+			return y;	/* division by zero */
+		byte[] temp=new byte[32];
+		while (true) {
+			qn = bn - an + 1;
+			divmod(temp, b, bn, a, an);
+			bn = numsize(b, bn);
+			if (bn==0)
+				return x;
+			mula32(y, x, temp, qn, -1);
+
+			qn = an - bn + 1;
+			divmod(temp, a, an, b, bn);
+			an = numsize(a, an);
+			if (an==0)
+				return y;
+			mula32(x, y, temp, qn, -1);
+		}
+	}
+	
+	/********************* radix 2^25.5 GF(2^255-19) math *********************/	
+	
+	private static final int P25=33554431;	/* (1 << 25) - 1 */
+	private static final int P26=67108863;	/* (1 << 26) - 1 */
+	
+	/* Convert to internal format from little-endian byte format */
+	private static final void unpack(long10 x,byte[] m) {
+		x._0 = ((m[0] & 0xFF))         | ((m[1] & 0xFF))<<8 |
+				(m[2] & 0xFF)<<16      | ((m[3] & 0xFF)& 3)<<24;
+		x._1 = ((m[3] & 0xFF)&~ 3)>>2  | (m[4] & 0xFF)<<6 |
+				(m[5] & 0xFF)<<14 | ((m[6] & 0xFF)& 7)<<22;
+		x._2 = ((m[6] & 0xFF)&~ 7)>>3  | (m[7] & 0xFF)<<5 |
+				(m[8] & 0xFF)<<13 | ((m[9] & 0xFF)&31)<<21;
+		x._3 = ((m[9] & 0xFF)&~31)>>5  | (m[10] & 0xFF)<<3 |
+				(m[11] & 0xFF)<<11 | ((m[12] & 0xFF)&63)<<19;
+		x._4 = ((m[12] & 0xFF)&~63)>>6 | (m[13] & 0xFF)<<2 |
+				(m[14] & 0xFF)<<10 |  (m[15] & 0xFF)    <<18;
+		x._5 =  (m[16] & 0xFF)         | (m[17] & 0xFF)<<8 |
+				(m[18] & 0xFF)<<16 | ((m[19] & 0xFF)& 1)<<24;
+		x._6 = ((m[19] & 0xFF)&~ 1)>>1 | (m[20] & 0xFF)<<7 |
+				(m[21] & 0xFF)<<15 | ((m[22] & 0xFF)& 7)<<23;
+		x._7 = ((m[22] & 0xFF)&~ 7)>>3 | (m[23] & 0xFF)<<5 |
+				(m[24] & 0xFF)<<13 | ((m[25] & 0xFF)&15)<<21;
+		x._8 = ((m[25] & 0xFF)&~15)>>4 | (m[26] & 0xFF)<<4 |
+				(m[27] & 0xFF)<<12 | ((m[28] & 0xFF)&63)<<20;
+		x._9 = ((m[28] & 0xFF)&~63)>>6 | (m[29] & 0xFF)<<2 |
+				(m[30] & 0xFF)<<10 |  (m[31] & 0xFF)    <<18;
+	}
+	
+	/* Check if reduced-form input >= 2^255-19 */
+	private static final boolean is_overflow(long10 x) {
+		return (
+			((x._0 > P26-19)) &&
+			((x._1 & x._3 & x._5 & x._7 & x._9) == P25) &&
+			((x._2 & x._4 & x._6 & x._8) == P26)
+			) || (x._9 > P25);
+	}
+	
+	/* Convert from internal format to little-endian byte format.  The 
+	 * number must be in a reduced form which is output by the following ops:
+	 *     unpack, mul, sqr
+	 *     set --  if input in range 0 .. P25
+	 * If you're unsure if the number is reduced, first multiply it by 1.  */
+	private static final void pack(long10 x,byte[] m) {
+		int ld = 0, ud = 0;
+		long t;
+		ld = (is_overflow(x)?1:0) - ((x._9 < 0)?1:0);
+		ud = ld * -(P25+1);
+		ld *= 19;
+		t = ld + x._0 + (x._1 << 26);
+		m[ 0] = (byte)t;
+		m[ 1] = (byte)(t >> 8);
+		m[ 2] = (byte)(t >> 16);
+		m[ 3] = (byte)(t >> 24);
+		t = (t >> 32) + (x._2 << 19);
+		m[ 4] = (byte)t;
+		m[ 5] = (byte)(t >> 8);
+		m[ 6] = (byte)(t >> 16);
+		m[ 7] = (byte)(t >> 24);
+		t = (t >> 32) + (x._3 << 13);
+		m[ 8] = (byte)t;
+		m[ 9] = (byte)(t >> 8);
+		m[10] = (byte)(t >> 16);
+		m[11] = (byte)(t >> 24);
+		t = (t >> 32) + (x._4 <<  6);
+		m[12] = (byte)t;
+		m[13] = (byte)(t >> 8);
+		m[14] = (byte)(t >> 16);
+		m[15] = (byte)(t >> 24);
+		t = (t >> 32) + x._5 + (x._6 << 25);
+		m[16] = (byte)t;
+		m[17] = (byte)(t >> 8);
+		m[18] = (byte)(t >> 16);
+		m[19] = (byte)(t >> 24);
+		t = (t >> 32) + (x._7 << 19);
+		m[20] = (byte)t;
+		m[21] = (byte)(t >> 8);
+		m[22] = (byte)(t >> 16);
+		m[23] = (byte)(t >> 24);
+		t = (t >> 32) + (x._8 << 12);
+		m[24] = (byte)t;
+		m[25] = (byte)(t >> 8);
+		m[26] = (byte)(t >> 16);
+		m[27] = (byte)(t >> 24);
+		t = (t >> 32) + ((x._9 + ud) << 6);
+		m[28] = (byte)t;
+		m[29] = (byte)(t >> 8);
+		m[30] = (byte)(t >> 16);
+		m[31] = (byte)(t >> 24);
+	}
+
+	/* Copy a number */
+	private static final void cpy(long10 out, long10 in) {
+		out._0=in._0;	out._1=in._1;
+		out._2=in._2;	out._3=in._3;
+		out._4=in._4;	out._5=in._5;
+		out._6=in._6;	out._7=in._7;
+		out._8=in._8;	out._9=in._9;		
+	}
+
+	/* Set a number to value, which must be in range -185861411 .. 185861411 */
+	private static final void set(long10 out, int in) {
+		out._0=in;	out._1=0;
+		out._2=0;	out._3=0;
+		out._4=0;	out._5=0;
+		out._6=0;	out._7=0;
+		out._8=0;	out._9=0;		
+	}
+	
+	/* Add/subtract two numbers.  The inputs must be in reduced form, and the 
+	 * output isn't, so to do another addition or subtraction on the output, 
+	 * first multiply it by one to reduce it. */
+	private static final void add(long10 xy, long10 x, long10 y) {
+		xy._0 = x._0 + y._0;	xy._1 = x._1 + y._1;
+		xy._2 = x._2 + y._2;	xy._3 = x._3 + y._3;
+		xy._4 = x._4 + y._4;	xy._5 = x._5 + y._5;
+		xy._6 = x._6 + y._6;	xy._7 = x._7 + y._7;
+		xy._8 = x._8 + y._8;	xy._9 = x._9 + y._9;
+	}
+	private static final void sub(long10 xy, long10 x, long10 y) {
+		xy._0 = x._0 - y._0;	xy._1 = x._1 - y._1;
+		xy._2 = x._2 - y._2;	xy._3 = x._3 - y._3;
+		xy._4 = x._4 - y._4;	xy._5 = x._5 - y._5;
+		xy._6 = x._6 - y._6;	xy._7 = x._7 - y._7;
+		xy._8 = x._8 - y._8;	xy._9 = x._9 - y._9;
+	}
+	
+	/* Multiply a number by a small integer in range -185861411 .. 185861411.
+	 * The output is in reduced form, the input x need not be.  x and xy may point
+	 * to the same buffer. */
+	private static final long10 mul_small(long10 xy, long10 x, long y) {
+		long t;
+		t = (x._8*y);
+		xy._8 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x._9*y);
+		xy._9 = (t & ((1 << 25) - 1));
+		t = 19 * (t >> 25) + (x._0*y);
+		xy._0 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x._1*y);
+		xy._1 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x._2*y);
+		xy._2 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x._3*y);
+		xy._3 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x._4*y);
+		xy._4 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x._5*y);
+		xy._5 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x._6*y);
+		xy._6 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x._7*y);
+		xy._7 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + xy._8;
+		xy._8 = (t & ((1 << 26) - 1));
+		xy._9 += (t >> 26);
+		return xy;
+	}
+
+	/* Multiply two numbers.  The output is in reduced form, the inputs need not 
+	 * be. */
+	private static final long10 mul(long10 xy, long10 x, long10 y) {
+		/* sahn0:
+		 * Using local variables to avoid class access.
+		 * This seem to improve performance a bit...
+		 */
+		long
+			x_0=x._0,x_1=x._1,x_2=x._2,x_3=x._3,x_4=x._4,
+			x_5=x._5,x_6=x._6,x_7=x._7,x_8=x._8,x_9=x._9;
+		long
+			y_0=y._0,y_1=y._1,y_2=y._2,y_3=y._3,y_4=y._4,
+			y_5=y._5,y_6=y._6,y_7=y._7,y_8=y._8,y_9=y._9;
+		long t;
+		t = (x_0*y_8) + (x_2*y_6) + (x_4*y_4) + (x_6*y_2) +
+			(x_8*y_0) + 2 * ((x_1*y_7) + (x_3*y_5) +
+					(x_5*y_3) + (x_7*y_1)) + 38 *
+			(x_9*y_9);
+		xy._8 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x_0*y_9) + (x_1*y_8) + (x_2*y_7) +
+			(x_3*y_6) + (x_4*y_5) + (x_5*y_4) +
+			(x_6*y_3) + (x_7*y_2) + (x_8*y_1) +
+			(x_9*y_0);
+		xy._9 = (t & ((1 << 25) - 1));
+		t = (x_0*y_0) + 19 * ((t >> 25) + (x_2*y_8) + (x_4*y_6)
+				+ (x_6*y_4) + (x_8*y_2)) + 38 *
+			((x_1*y_9) + (x_3*y_7) + (x_5*y_5) +
+			 (x_7*y_3) + (x_9*y_1));
+		xy._0 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x_0*y_1) + (x_1*y_0) + 19 * ((x_2*y_9)
+				+ (x_3*y_8) + (x_4*y_7) + (x_5*y_6) +
+				(x_6*y_5) + (x_7*y_4) + (x_8*y_3) +
+				(x_9*y_2));
+		xy._1 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x_0*y_2) + (x_2*y_0) + 19 * ((x_4*y_8)
+				+ (x_6*y_6) + (x_8*y_4)) + 2 * (x_1*y_1)
+				+ 38 * ((x_3*y_9) + (x_5*y_7) +
+						(x_7*y_5) + (x_9*y_3));
+		xy._2 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x_0*y_3) + (x_1*y_2) + (x_2*y_1) +
+			(x_3*y_0) + 19 * ((x_4*y_9) + (x_5*y_8) +
+					(x_6*y_7) + (x_7*y_6) +
+					(x_8*y_5) + (x_9*y_4));
+		xy._3 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x_0*y_4) + (x_2*y_2) + (x_4*y_0) + 19 *
+			((x_6*y_8) + (x_8*y_6)) + 2 * ((x_1*y_3) +
+								 (x_3*y_1)) + 38 *
+			((x_5*y_9) + (x_7*y_7) + (x_9*y_5));
+		xy._4 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x_0*y_5) + (x_1*y_4) + (x_2*y_3) +
+			(x_3*y_2) + (x_4*y_1) + (x_5*y_0) + 19 *
+			((x_6*y_9) + (x_7*y_8) + (x_8*y_7) +
+			 (x_9*y_6));
+		xy._5 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x_0*y_6) + (x_2*y_4) + (x_4*y_2) +
+			(x_6*y_0) + 19 * (x_8*y_8) + 2 * ((x_1*y_5) +
+					(x_3*y_3) + (x_5*y_1)) + 38 *
+			((x_7*y_9) + (x_9*y_7));
+		xy._6 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + (x_0*y_7) + (x_1*y_6) + (x_2*y_5) +
+			(x_3*y_4) + (x_4*y_3) + (x_5*y_2) +
+			(x_6*y_1) + (x_7*y_0) + 19 * ((x_8*y_9) +
+					(x_9*y_8));
+		xy._7 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + xy._8;
+		xy._8 = (t & ((1 << 26) - 1));
+		xy._9 += (t >> 26);
+		return xy;
+	}
+
+	/* Square a number.  Optimization of  mul25519(x2, x, x)  */
+	private static final long10 sqr(long10 x2, long10 x) {
+		long
+			x_0=x._0,x_1=x._1,x_2=x._2,x_3=x._3,x_4=x._4,
+			x_5=x._5,x_6=x._6,x_7=x._7,x_8=x._8,x_9=x._9;
+		long t;
+		t = (x_4*x_4) + 2 * ((x_0*x_8) + (x_2*x_6)) + 38 *
+			(x_9*x_9) + 4 * ((x_1*x_7) + (x_3*x_5));
+		x2._8 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + 2 * ((x_0*x_9) + (x_1*x_8) + (x_2*x_7) +
+				(x_3*x_6) + (x_4*x_5));
+		x2._9 = (t & ((1 << 25) - 1));
+		t = 19 * (t >> 25) + (x_0*x_0) + 38 * ((x_2*x_8) +
+				(x_4*x_6) + (x_5*x_5)) + 76 * ((x_1*x_9)
+				+ (x_3*x_7));
+		x2._0 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + 2 * (x_0*x_1) + 38 * ((x_2*x_9) +
+				(x_3*x_8) + (x_4*x_7) + (x_5*x_6));
+		x2._1 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + 19 * (x_6*x_6) + 2 * ((x_0*x_2) +
+				(x_1*x_1)) + 38 * (x_4*x_8) + 76 *
+				((x_3*x_9) + (x_5*x_7));
+		x2._2 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + 2 * ((x_0*x_3) + (x_1*x_2)) + 38 *
+			((x_4*x_9) + (x_5*x_8) + (x_6*x_7));
+		x2._3 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + (x_2*x_2) + 2 * (x_0*x_4) + 38 *
+			((x_6*x_8) + (x_7*x_7)) + 4 * (x_1*x_3) + 76 *
+			(x_5*x_9);
+		x2._4 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + 2 * ((x_0*x_5) + (x_1*x_4) + (x_2*x_3))
+			+ 38 * ((x_6*x_9) + (x_7*x_8));
+		x2._5 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + 19 * (x_8*x_8) + 2 * ((x_0*x_6) +
+				(x_2*x_4) + (x_3*x_3)) + 4 * (x_1*x_5) +
+				76 * (x_7*x_9);
+		x2._6 = (t & ((1 << 26) - 1));
+		t = (t >> 26) + 2 * ((x_0*x_7) + (x_1*x_6) + (x_2*x_5) +
+				(x_3*x_4)) + 38 * (x_8*x_9);
+		x2._7 = (t & ((1 << 25) - 1));
+		t = (t >> 25) + x2._8;
+		x2._8 = (t & ((1 << 26) - 1));
+		x2._9 += (t >> 26);
+		return x2;
+	}
+	
+	/* Calculates a reciprocal.  The output is in reduced form, the inputs need not 
+	 * be.  Simply calculates  y = x^(p-2)  so it's not too fast. */
+	/* When sqrtassist is true, it instead calculates y = x^((p-5)/8) */
+	private static final void recip(long10 y, long10 x, int sqrtassist) {
+		long10
+		    t0=new long10(),
+			t1=new long10(),
+			t2=new long10(),
+			t3=new long10(),
+			t4=new long10();
+		int i;
+		/* the chain for x^(2^255-21) is straight from djb's implementation */
+		sqr(t1, x);	/*  2 == 2 * 1	*/
+		sqr(t2, t1);	/*  4 == 2 * 2	*/
+		sqr(t0, t2);	/*  8 == 2 * 4	*/
+		mul(t2, t0, x);	/*  9 == 8 + 1	*/
+		mul(t0, t2, t1);	/* 11 == 9 + 2	*/
+		sqr(t1, t0);	/* 22 == 2 * 11	*/
+		mul(t3, t1, t2);	/* 31 == 22 + 9
+					== 2^5   - 2^0	*/
+		sqr(t1, t3);	/* 2^6   - 2^1	*/
+		sqr(t2, t1);	/* 2^7   - 2^2	*/
+		sqr(t1, t2);	/* 2^8   - 2^3	*/
+		sqr(t2, t1);	/* 2^9   - 2^4	*/
+		sqr(t1, t2);	/* 2^10  - 2^5	*/
+		mul(t2, t1, t3);	/* 2^10  - 2^0	*/
+		sqr(t1, t2);	/* 2^11  - 2^1	*/
+		sqr(t3, t1);	/* 2^12  - 2^2	*/
+		for (i = 1; i < 5; i++) {
+			sqr(t1, t3);
+			sqr(t3, t1);
+		} /* t3 */		/* 2^20  - 2^10	*/
+		mul(t1, t3, t2);	/* 2^20  - 2^0	*/
+		sqr(t3, t1);	/* 2^21  - 2^1	*/
+		sqr(t4, t3);	/* 2^22  - 2^2	*/
+		for (i = 1; i < 10; i++) {
+			sqr(t3, t4);
+			sqr(t4, t3);
+		} /* t4 */		/* 2^40  - 2^20	*/
+		mul(t3, t4, t1);	/* 2^40  - 2^0	*/
+		for (i = 0; i < 5; i++) {
+			sqr(t1, t3);
+			sqr(t3, t1);
+		} /* t3 */		/* 2^50  - 2^10	*/
+		mul(t1, t3, t2);	/* 2^50  - 2^0	*/
+		sqr(t2, t1);	/* 2^51  - 2^1	*/
+		sqr(t3, t2);	/* 2^52  - 2^2	*/
+		for (i = 1; i < 25; i++) {
+			sqr(t2, t3);
+			sqr(t3, t2);
+		} /* t3 */		/* 2^100 - 2^50 */
+		mul(t2, t3, t1);	/* 2^100 - 2^0	*/
+		sqr(t3, t2);	/* 2^101 - 2^1	*/
+		sqr(t4, t3);	/* 2^102 - 2^2	*/
+		for (i = 1; i < 50; i++) {
+			sqr(t3, t4);
+			sqr(t4, t3);
+		} /* t4 */		/* 2^200 - 2^100 */
+		mul(t3, t4, t2);	/* 2^200 - 2^0	*/
+		for (i = 0; i < 25; i++) {
+			sqr(t4, t3);
+			sqr(t3, t4);
+		} /* t3 */		/* 2^250 - 2^50	*/
+		mul(t2, t3, t1);	/* 2^250 - 2^0	*/
+		sqr(t1, t2);	/* 2^251 - 2^1	*/
+		sqr(t2, t1);	/* 2^252 - 2^2	*/
+		if (sqrtassist!=0) {
+			mul(y, x, t2);	/* 2^252 - 3 */
+		} else {
+			sqr(t1, t2);	/* 2^253 - 2^3	*/
+			sqr(t2, t1);	/* 2^254 - 2^4	*/
+			sqr(t1, t2);	/* 2^255 - 2^5	*/
+			mul(y, t1, t0);	/* 2^255 - 21	*/
+		}
+	}
+	
+	/* checks if x is "negative", requires reduced input */
+	private static final int is_negative(long10 x) {
+		return (int)(((is_overflow(x) || (x._9 < 0))?1:0) ^ (x._0 & 1));
+	}
+	
+	/* a square root */
+	private static final void sqrt(long10 x, long10 u) {
+		long10 v=new long10(), t1=new long10(), t2=new long10();
+		add(t1, u, u);	/* t1 = 2u		*/
+		recip(v, t1, 1);	/* v = (2u)^((p-5)/8)	*/
+		sqr(x, v);		/* x = v^2		*/
+		mul(t2, t1, x);	/* t2 = 2uv^2		*/
+		t2._0--;		/* t2 = 2uv^2-1		*/
+		mul(t1, v, t2);	/* t1 = v(2uv^2-1)	*/
+		mul(x, u, t1);	/* x = uv(2uv^2-1)	*/
+	}
+	
+	/********************* Elliptic curve *********************/
+	
+	/* y^2 = x^3 + 486662 x^2 + x  over GF(2^255-19) */
+	
+	/* t1 = ax + az
+	 * t2 = ax - az  */
+	private static final void mont_prep(long10 t1, long10 t2, long10 ax, long10 az) {
+		add(t1, ax, az);
+		sub(t2, ax, az);
+	}
+	
+	/* A = P + Q   where
+	 *  X(A) = ax/az
+	 *  X(P) = (t1+t2)/(t1-t2)
+	 *  X(Q) = (t3+t4)/(t3-t4)
+	 *  X(P-Q) = dx
+	 * clobbers t1 and t2, preserves t3 and t4  */
+	private static final void mont_add(long10 t1, long10 t2, long10 t3, long10 t4,long10 ax, long10 az, long10 dx) {
+		mul(ax, t2, t3);
+		mul(az, t1, t4);
+		add(t1, ax, az);
+		sub(t2, ax, az);
+		sqr(ax, t1);
+		sqr(t1, t2);
+		mul(az, t1, dx);
+	}
+	
+	/* B = 2 * Q   where
+	 *  X(B) = bx/bz
+	 *  X(Q) = (t3+t4)/(t3-t4)
+	 * clobbers t1 and t2, preserves t3 and t4  */
+	private static final void mont_dbl(long10 t1, long10 t2, long10 t3, long10 t4,long10 bx, long10 bz) {
+		sqr(t1, t3);
+		sqr(t2, t4);
+		mul(bx, t1, t2);
+		sub(t2, t1, t2);
+		mul_small(bz, t2, 121665);
+		add(t1, t1, bz);
+		mul(bz, t1, t2);
+	}
+	
+	/* Y^2 = X^3 + 486662 X^2 + X
+	 * t is a temporary  */
+	private static final void x_to_y2(long10 t, long10 y2, long10 x) {
+		sqr(t, x);
+		mul_small(y2, x, 486662);
+		add(t, t, y2);
+		t._0++;
+		mul(y2, t, x);
+	}
+	
+	/* P = kG   and  s = sign(P)/k  */
+	private static final void core(byte[] Px, byte[] s, byte[] k, byte[] Gx) {
+		long10 
+		    dx=new long10(),
+		    t1=new long10(),
+		    t2=new long10(),
+		    t3=new long10(),
+		    t4=new long10();
+	    long10[] 
+	        x=new long10[]{new long10(),new long10()},
+	    	z=new long10[]{new long10(),new long10()};
+		int i, j;
+
+		/* unpack the base */
+		if (Gx!=null)
+			unpack(dx, Gx);
+		else
+			set(dx, 9);
+
+		/* 0G = point-at-infinity */
+		set(x[0], 1);
+		set(z[0], 0);
+
+		/* 1G = G */
+		cpy(x[1], dx);
+		set(z[1], 1);
+
+		for (i = 32; i--!=0; ) {
+			if (i==0) {
+				i=0;
+			}
+			for (j = 8; j--!=0; ) {
+				/* swap arguments depending on bit */
+				int bit1 = (k[i] & 0xFF) >> j & 1;
+				int bit0 = ~(k[i] & 0xFF) >> j & 1;
+				long10 ax = x[bit0];
+				long10 az = z[bit0];
+				long10 bx = x[bit1];
+				long10 bz = z[bit1];
+
+				/* a' = a + b	*/
+				/* b' = 2 b	*/
+				mont_prep(t1, t2, ax, az);
+				mont_prep(t3, t4, bx, bz);
+				mont_add(t1, t2, t3, t4, ax, az, dx);
+				mont_dbl(t1, t2, t3, t4, bx, bz);
+			}
+		}
+
+		recip(t1, z[0], 0);
+		mul(dx, x[0], t1);
+		pack(dx, Px);
+
+		/* calculate s such that s abs(P) = G  .. assumes G is std base point */
+		if (s!=null) {
+			x_to_y2(t2, t1, dx);	/* t1 = Py^2  */
+			recip(t3, z[1], 0);	/* where Q=P+G ... */
+			mul(t2, x[1], t3);	/* t2 = Qx  */
+			add(t2, t2, dx);	/* t2 = Qx + Px  */
+			t2._0 += 9 + 486662;	/* t2 = Qx + Px + Gx + 486662  */
+			dx._0 -= 9;		/* dx = Px - Gx  */
+			sqr(t3, dx);	/* t3 = (Px - Gx)^2  */
+			mul(dx, t2, t3);	/* dx = t2 (Px - Gx)^2  */
+			sub(dx, dx, t1);	/* dx = t2 (Px - Gx)^2 - Py^2  */
+			dx._0 -= 39420360;	/* dx = t2 (Px - Gx)^2 - Py^2 - Gy^2  */
+			mul(t1, dx, BASE_R2Y);	/* t1 = -Py  */
+			if (is_negative(t1)!=0)	/* sign is 1, so just copy  */
+				cpy32(s, k);
+			else			/* sign is -1, so negate  */
+				mula_small(s, ORDER_TIMES_8, 0, k, 32, -1);
+
+			/* reduce s mod q
+			 * (is this needed?  do it just in case, it's fast anyway) */
+			//divmod((dstptr) t1, s, 32, order25519, 32);
+
+			/* take reciprocal of s mod q */
+			byte[] temp1=new byte[32];
+			byte[] temp2=new byte[64];
+			byte[] temp3=new byte[64];
+			cpy32(temp1, ORDER);
+			cpy32(s, egcd32(temp2, temp3, s, temp1));
+			if ((s[31] & 0x80)!=0)
+				mula_small(s, s, 0, ORDER, 32, 1);
+		}
+	}
+
+	/* smallest multiple of the order that's >= 2^255 */
+	private static final byte[] ORDER_TIMES_8 = {
+		(byte)104, (byte)159, (byte)174, (byte)231,
+		(byte)210, (byte)24,  (byte)147, (byte)192,
+		(byte)178, (byte)230, (byte)188, (byte)23,
+		(byte)245, (byte)206, (byte)247, (byte)166,
+		(byte)0,   (byte)0,   (byte)0,   (byte)0,  
+		(byte)0,   (byte)0,   (byte)0,   (byte)0,
+		(byte)0,   (byte)0,   (byte)0,   (byte)0,  
+		(byte)0,   (byte)0,   (byte)0,   (byte)128
+	};
+	
+	/* constants 2Gy and 1/(2Gy) */
+	private static final long10 BASE_2Y = new long10(
+		39999547, 18689728, 59995525, 1648697, 57546132,
+		24010086, 19059592, 5425144, 63499247, 16420658
+	);
+	private static final long10 BASE_R2Y = new long10(
+		5744, 8160848, 4790893, 13779497, 35730846,
+		12541209, 49101323, 30047407, 40071253, 6226132
+	);
+}

src/main/java/net/schmizz/concurrent/Event.java

@@ -18,6 +18,8 @@ package net.schmizz.concurrent;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReentrantLock;
 
+import net.schmizz.sshj.common.LoggerFactory;
+
 /**
  * An event can be set, cleared, or awaited, similar to Python's {@code threading.event}. The key difference is that a
  * waiter may be delivered an exception of parameterized type {@code T}.
@@ -42,8 +44,8 @@ public class Event<T extends Throwable> {
      * @param name    name of this event
      * @param chainer {@link ExceptionChainer} that will be used for chaining exceptions
      */
-    public Event(String name, ExceptionChainer<T> chainer) {
-        promise = new Promise<Object, T>(name, chainer);
+    public Event(String name, ExceptionChainer<T> chainer, LoggerFactory loggerFactory) {
+        promise = new Promise<Object, T>(name, chainer, loggerFactory);
     }
 
     /**
@@ -53,8 +55,8 @@ public class Event<T extends Throwable> {
      * @param chainer {@link ExceptionChainer} that will be used for chaining exceptions
      * @param lock    lock to use
      */
-    public Event(String name, ExceptionChainer<T> chainer, ReentrantLock lock) {
-        promise = new Promise<Object, T>(name, chainer, lock);
+    public Event(String name, ExceptionChainer<T> chainer, ReentrantLock lock, LoggerFactory loggerFactory) {
+        promise = new Promise<Object, T>(name, chainer, lock, loggerFactory);
     }
 
     /** Sets this event to be {@code true}. Short for {@code set(true)}. */

src/main/java/net/schmizz/concurrent/Promise.java

@@ -16,13 +16,14 @@
 package net.schmizz.concurrent;
 
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
 
+import net.schmizz.sshj.common.LoggerFactory;
+
 /**
  * Represents promised data of the parameterized type {@code V} and allows waiting on it. An exception may also be
  * delivered to a waiter, and will be of the parameterized type {@code T}.
@@ -32,8 +33,7 @@ import java.util.concurrent.locks.ReentrantLock;
  */
 public class Promise<V, T extends Throwable> {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
+    private final Logger log;
     private final String name;
     private final ExceptionChainer<T> chainer;
     private final ReentrantLock lock;
@@ -49,8 +49,8 @@ public class Promise<V, T extends Throwable> {
      * @param name    name of this promise
      * @param chainer {@link ExceptionChainer} that will be used for chaining exceptions
      */
-    public Promise(String name, ExceptionChainer<T> chainer) {
-        this(name, chainer, null);
+    public Promise(String name, ExceptionChainer<T> chainer, LoggerFactory loggerFactory) {
+        this(name, chainer, null, loggerFactory);
     }
 
     /**
@@ -60,10 +60,11 @@ public class Promise<V, T extends Throwable> {
      * @param chainer {@link ExceptionChainer} that will be used for chaining exceptions
      * @param lock    lock to use
      */
-    public Promise(String name, ExceptionChainer<T> chainer, ReentrantLock lock) {
+    public Promise(String name, ExceptionChainer<T> chainer, ReentrantLock lock, LoggerFactory loggerFactory) {
         this.name = name;
         this.chainer = chainer;
         this.lock = lock == null ? new ReentrantLock() : lock;
+        this.log = loggerFactory.getLogger(getClass());
         this.cond = this.lock.newCondition();
     }
 

src/main/java/net/schmizz/keepalive/KeepAlive.java

@@ -19,17 +19,16 @@ import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.connection.ConnectionImpl;
 import net.schmizz.sshj.transport.TransportException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 public abstract class KeepAlive extends Thread {
-    protected final Logger log = LoggerFactory.getLogger(getClass());
-
+    protected final Logger log;
     protected final ConnectionImpl conn;
 
     protected int keepAliveInterval = 0;
 
     protected KeepAlive(ConnectionImpl conn, String name) {
         this.conn = conn;
+        log = conn.getTransport().getConfig().getLoggerFactory().getLogger(getClass());
         setName(name);
     }
 
@@ -65,6 +64,8 @@ public abstract class KeepAlive extends Thread {
                 }
                 Thread.sleep(hi * 1000);
             }
+        } catch (InterruptedException e) {
+            // Interrupt signal may be catched when sleeping.      
         } catch (Exception e) {
             // If we weren't interrupted, kill the transport, then this exception was unexpected.
             // Else we're in shutdown-mode already, so don't forcibly kill the transport.

src/main/java/net/schmizz/sshj/AbstractService.java

@@ -22,14 +22,13 @@ import net.schmizz.sshj.common.SSHPacket;
 import net.schmizz.sshj.transport.Transport;
 import net.schmizz.sshj.transport.TransportException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /** An abstract class for {@link Service} that implements common or default functionality. */
 public abstract class AbstractService
         implements Service {
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final Logger log;
 
     /** Assigned name of this service */
     protected final String name;
@@ -39,6 +38,7 @@ public abstract class AbstractService
     public AbstractService(String name, Transport trans) {
         this.name = name;
         this.trans = trans;
+	log = trans.getConfig().getLoggerFactory().getLogger(getClass());
     }
 
     @Override

src/main/java/net/schmizz/sshj/AndroidConfig.java

@@ -15,12 +15,24 @@
  */
 package net.schmizz.sshj;
 
+import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.signature.SignatureDSA;
+import net.schmizz.sshj.signature.SignatureRSA;
 import net.schmizz.sshj.transport.random.JCERandom;
 import net.schmizz.sshj.transport.random.SingletonRandomFactory;
 
 public class AndroidConfig
         extends DefaultConfig {
 
+    static {
+        SecurityUtils.registerSecurityProvider("org.spongycastle.jce.provider.BouncyCastleProvider");
+    }
+
+    // don't add ECDSA
+    protected void initSignatureFactories() {
+        setSignatureFactories(new SignatureRSA.Factory(), new SignatureDSA.Factory());
+    }
+
     @Override
     protected void initRandomFactory(boolean ignored) {
         setRandomFactory(new SingletonRandomFactory(new JCERandom.Factory()));

src/main/java/net/schmizz/sshj/Config.java

@@ -17,6 +17,7 @@ package net.schmizz.sshj;
 
 import net.schmizz.keepalive.KeepAliveProvider;
 import net.schmizz.sshj.common.Factory;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.signature.Signature;
 import net.schmizz.sshj.transport.cipher.Cipher;
 import net.schmizz.sshj.transport.compression.Compression;
@@ -175,4 +176,14 @@ public interface Config {
      * @param waitForServerIdentBeforeSendingClientIdent Whether to wait for the server ident.
      */
     void setWaitForServerIdentBeforeSendingClientIdent(boolean waitForServerIdentBeforeSendingClientIdent);
+
+    /**
+     * Sets the LoggerFactory to use.
+     */
+    void setLoggerFactory(LoggerFactory loggerFactory);
+
+    /**
+     * @return The LoggerFactory the SSHClient will use.
+     */
+    LoggerFactory getLoggerFactory();
 }

src/main/java/net/schmizz/sshj/ConfigImpl.java

@@ -16,6 +16,7 @@
 package net.schmizz.sshj;
 
 import net.schmizz.keepalive.KeepAliveProvider;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.Factory;
 import net.schmizz.sshj.signature.Signature;
 import net.schmizz.sshj.transport.cipher.Cipher;
@@ -45,6 +46,7 @@ public class ConfigImpl
     private List<Factory.Named<FileKeyProvider>> fileKeyProviderFactories;
 
     private boolean waitForServerIdentBeforeSendingClientIdent = false;
+    private LoggerFactory loggerFactory;
 
     @Override
     public List<Factory.Named<Cipher>> getCipherFactories() {
@@ -169,4 +171,14 @@ public class ConfigImpl
     public void setWaitForServerIdentBeforeSendingClientIdent(boolean waitForServerIdentBeforeSendingClientIdent) {
         this.waitForServerIdentBeforeSendingClientIdent = waitForServerIdentBeforeSendingClientIdent;
     }
+
+    @Override
+    public LoggerFactory getLoggerFactory() {
+        return loggerFactory;
+    }
+
+    @Override
+    public void setLoggerFactory(LoggerFactory loggerFactory) {
+        this.loggerFactory = loggerFactory;
+    }
 }

src/main/java/net/schmizz/sshj/DefaultConfig.java

@@ -18,44 +18,34 @@ package net.schmizz.sshj;
 import com.hierynomus.sshj.signature.SignatureEdDSA;
 import com.hierynomus.sshj.transport.cipher.BlockCiphers;
 import com.hierynomus.sshj.transport.cipher.StreamCiphers;
+import com.hierynomus.sshj.transport.kex.DHGroups;
+import com.hierynomus.sshj.transport.kex.ExtendedDHGroups;
+import com.hierynomus.sshj.userauth.keyprovider.OpenSSHKeyV1KeyFile;
 import net.schmizz.keepalive.KeepAliveProvider;
 import net.schmizz.sshj.common.Factory;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SecurityUtils;
 import net.schmizz.sshj.signature.SignatureDSA;
 import net.schmizz.sshj.signature.SignatureECDSA;
 import net.schmizz.sshj.signature.SignatureRSA;
-import net.schmizz.sshj.transport.cipher.AES128CBC;
-import net.schmizz.sshj.transport.cipher.AES128CTR;
-import net.schmizz.sshj.transport.cipher.AES192CBC;
-import net.schmizz.sshj.transport.cipher.AES192CTR;
-import net.schmizz.sshj.transport.cipher.AES256CBC;
-import net.schmizz.sshj.transport.cipher.AES256CTR;
-import net.schmizz.sshj.transport.cipher.BlowfishCBC;
-import net.schmizz.sshj.transport.cipher.Cipher;
-import net.schmizz.sshj.transport.cipher.TripleDESCBC;
+import net.schmizz.sshj.transport.cipher.*;
 import net.schmizz.sshj.transport.compression.NoneCompression;
-import net.schmizz.sshj.transport.kex.*;
-import net.schmizz.sshj.transport.mac.HMACMD5;
-import net.schmizz.sshj.transport.mac.HMACMD596;
-import net.schmizz.sshj.transport.mac.HMACSHA1;
-import net.schmizz.sshj.transport.mac.HMACSHA196;
-import net.schmizz.sshj.transport.mac.HMACSHA2256;
-import net.schmizz.sshj.transport.mac.HMACSHA2512;
+import net.schmizz.sshj.transport.kex.Curve25519SHA256;
+import net.schmizz.sshj.transport.kex.DHGexSHA1;
+import net.schmizz.sshj.transport.kex.DHGexSHA256;
+import net.schmizz.sshj.transport.kex.ECDHNistP;
+import net.schmizz.sshj.transport.mac.*;
 import net.schmizz.sshj.transport.random.BouncyCastleRandom;
 import net.schmizz.sshj.transport.random.JCERandom;
 import net.schmizz.sshj.transport.random.SingletonRandomFactory;
 import net.schmizz.sshj.userauth.keyprovider.OpenSSHKeyFile;
+import net.schmizz.sshj.userauth.keyprovider.PKCS5KeyFile;
 import net.schmizz.sshj.userauth.keyprovider.PKCS8KeyFile;
 import net.schmizz.sshj.userauth.keyprovider.PuTTYKeyFile;
-
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import java.awt.image.ByteLookupTable;
-import java.util.Arrays;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
+import java.io.IOException;
+import java.util.*;
 
 /**
  * A {@link net.schmizz.sshj.Config} that is initialized as follows. Items marked with an asterisk are added to the config only if
@@ -82,12 +72,11 @@ import java.util.List;
 public class DefaultConfig
         extends ConfigImpl {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
-    private static final String VERSION = "SSHJ_0_14_0";
+    private Logger log;
 
     public DefaultConfig() {
-        setVersion(VERSION);
+        setLoggerFactory(LoggerFactory.DEFAULT);
+        setVersion(readVersionFromProperties());
         final boolean bouncyCastleRegistered = SecurityUtils.isBouncyCastleRegistered();
         initKeyExchangeFactories(bouncyCastleRegistered);
         initRandomFactory(bouncyCastleRegistered);
@@ -99,18 +88,50 @@ public class DefaultConfig
         setKeepAliveProvider(KeepAliveProvider.HEARTBEAT);
     }
 
+    private String readVersionFromProperties() {
+        try {
+            Properties properties = new Properties();
+            properties.load(DefaultConfig.class.getClassLoader().getResourceAsStream("sshj.properties"));
+            String property = properties.getProperty("sshj.version");
+            return "SSHJ_" + property.replace('-', '_'); // '-' is a disallowed character, see RFC-4253#section-4.2
+        } catch (IOException e) {
+            log.error("Could not read the sshj.properties file, returning an 'unknown' version as fallback.");
+            return "SSHJ_VERSION_UNKNOWN";
+        }
+    }
+
+    @Override
+    public void setLoggerFactory(LoggerFactory loggerFactory) {
+	super.setLoggerFactory(loggerFactory);
+	log = loggerFactory.getLogger(getClass());
+    }
+
     protected void initKeyExchangeFactories(boolean bouncyCastleRegistered) {
-        if (bouncyCastleRegistered)
+        if (bouncyCastleRegistered) {
             setKeyExchangeFactories(new Curve25519SHA256.Factory(),
                     new DHGexSHA256.Factory(),
                     new ECDHNistP.Factory521(),
                     new ECDHNistP.Factory384(),
                     new ECDHNistP.Factory256(),
                     new DHGexSHA1.Factory(),
-                    new DHG14.Factory(),
-                    new DHG1.Factory());
-        else
-            setKeyExchangeFactories(new DHG1.Factory(), new DHGexSHA1.Factory());
+                    DHGroups.Group1SHA1(),
+                    DHGroups.Group14SHA1(),
+                    DHGroups.Group14SHA256(),
+                    DHGroups.Group15SHA512(),
+                    DHGroups.Group16SHA512(),
+                    DHGroups.Group17SHA512(),
+                    DHGroups.Group18SHA512(),
+                    ExtendedDHGroups.Group14SHA256AtSSH(),
+                    ExtendedDHGroups.Group15SHA256(),
+                    ExtendedDHGroups.Group15SHA256AtSSH(),
+                    ExtendedDHGroups.Group15SHA384AtSSH(),
+                    ExtendedDHGroups.Group16SHA256(),
+                    ExtendedDHGroups.Group16SHA384AtSSH(),
+                    ExtendedDHGroups.Group16SHA512AtSSH(),
+                    ExtendedDHGroups.Group18SHA512AtSSH());
+        } else {
+            setKeyExchangeFactories(DHGroups.Group1SHA1(), new DHGexSHA1.Factory());
+        }
     }
 
     protected void initRandomFactory(boolean bouncyCastleRegistered) {
@@ -120,7 +141,12 @@ public class DefaultConfig
 
     protected void initFileKeyProviderFactories(boolean bouncyCastleRegistered) {
         if (bouncyCastleRegistered) {
-            setFileKeyProviderFactories(new PKCS8KeyFile.Factory(), new OpenSSHKeyFile.Factory(), new PuTTYKeyFile.Factory());
+            setFileKeyProviderFactories(
+                    new OpenSSHKeyV1KeyFile.Factory(),
+                    new PKCS8KeyFile.Factory(),
+                    new PKCS5KeyFile.Factory(),
+                    new OpenSSHKeyFile.Factory(),
+                    new PuTTYKeyFile.Factory());
         }
     }
 
@@ -156,7 +182,8 @@ public class DefaultConfig
                 BlockCiphers.TwofishCBC(),
                 StreamCiphers.Arcfour(),
                 StreamCiphers.Arcfour128(),
-                StreamCiphers.Arcfour256()));
+                StreamCiphers.Arcfour256())
+        );
 
         boolean warn = false;
         // Ref. https://issues.apache.org/jira/browse/SSHD-24
@@ -182,17 +209,26 @@ public class DefaultConfig
     }
 
     protected void initSignatureFactories() {
-        setSignatureFactories(new SignatureECDSA.Factory(), new SignatureRSA.Factory(), new SignatureDSA.Factory(), new SignatureEdDSA.Factory());
+        setSignatureFactories(
+                new SignatureECDSA.Factory(),
+                new SignatureRSA.Factory(),
+                new SignatureDSA.Factory(),
+                new SignatureEdDSA.Factory()
+        );
     }
 
     protected void initMACFactories() {
-        setMACFactories(new HMACSHA1.Factory(), new HMACSHA196.Factory(), new HMACMD5.Factory(),
-                new HMACMD596.Factory(), new HMACSHA2256.Factory(), new HMACSHA2512.Factory());
+        setMACFactories(
+                new HMACSHA1.Factory(),
+                new HMACSHA196.Factory(),
+                new HMACMD5.Factory(),
+                new HMACMD596.Factory(),
+                new HMACSHA2256.Factory(),
+                new HMACSHA2512.Factory()
+        );
     }
 
     protected void initCompressionFactories() {
         setCompressionFactories(new NoneCompression.Factory());
     }
-
-
 }

src/main/java/net/schmizz/sshj/SSHClient.java

@@ -16,6 +16,8 @@
 package net.schmizz.sshj;
 
 import net.schmizz.sshj.common.Factory;
+import net.schmizz.sshj.common.IOUtils;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHException;
 import net.schmizz.sshj.common.SecurityUtils;
 import net.schmizz.sshj.connection.Connection;
@@ -45,17 +47,8 @@ import net.schmizz.sshj.transport.verification.OpenSSHKnownHosts;
 import net.schmizz.sshj.userauth.UserAuth;
 import net.schmizz.sshj.userauth.UserAuthException;
 import net.schmizz.sshj.userauth.UserAuthImpl;
-import net.schmizz.sshj.userauth.keyprovider.FileKeyProvider;
-import net.schmizz.sshj.userauth.keyprovider.KeyFormat;
-import net.schmizz.sshj.userauth.keyprovider.KeyPairWrapper;
-import net.schmizz.sshj.userauth.keyprovider.KeyProvider;
-import net.schmizz.sshj.userauth.keyprovider.KeyProviderUtil;
-import net.schmizz.sshj.userauth.method.AuthGssApiWithMic;
-import net.schmizz.sshj.userauth.method.AuthKeyboardInteractive;
-import net.schmizz.sshj.userauth.method.AuthMethod;
-import net.schmizz.sshj.userauth.method.AuthPassword;
-import net.schmizz.sshj.userauth.method.AuthPublickey;
-import net.schmizz.sshj.userauth.method.PasswordResponseProvider;
+import net.schmizz.sshj.userauth.keyprovider.*;
+import net.schmizz.sshj.userauth.method.*;
 import net.schmizz.sshj.userauth.password.PasswordFinder;
 import net.schmizz.sshj.userauth.password.PasswordUpdateProvider;
 import net.schmizz.sshj.userauth.password.PasswordUtils;
@@ -63,21 +56,16 @@ import net.schmizz.sshj.userauth.password.Resource;
 import net.schmizz.sshj.xfer.scp.SCPFileTransfer;
 import org.ietf.jgss.Oid;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import javax.security.auth.login.LoginContext;
-
 import java.io.Closeable;
 import java.io.File;
 import java.io.IOException;
 import java.net.ServerSocket;
+import java.nio.charset.Charset;
 import java.security.KeyPair;
 import java.security.PublicKey;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Deque;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.*;
 
 /**
  * Secure SHell client API.
@@ -128,7 +116,8 @@ public class SSHClient
     public static final int DEFAULT_PORT = 22;
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final LoggerFactory loggerFactory;
+    protected final Logger log;
 
     /** Transport layer */
     protected final Transport trans;
@@ -139,6 +128,11 @@ public class SSHClient
     /** {@code ssh-connection} service */
     protected final Connection conn;
 
+    private final List<LocalPortForwarder> forwarders = new ArrayList<LocalPortForwarder>();
+
+    /** character set of the remote machine */
+    protected Charset remoteCharset = IOUtils.UTF8;
+
     /** Default constructor. Initializes this object using {@link DefaultConfig}. */
     public SSHClient() {
         this(new DefaultConfig());
@@ -151,6 +145,8 @@ public class SSHClient
      */
     public SSHClient(Config config) {
         super(DEFAULT_PORT);
+	loggerFactory = config.getLoggerFactory();
+	log = loggerFactory.getLogger(getClass());
         this.trans = new TransportImpl(config, this);
         this.auth = new UserAuthImpl(trans);
         this.conn = new ConnectionImpl(trans, config.getKeepAliveProvider());
@@ -221,8 +217,9 @@ public class SSHClient
     public void auth(String username, Iterable<AuthMethod> methods)
             throws UserAuthException, TransportException {
         checkConnected();
-        final Deque<UserAuthException> savedEx = new LinkedList<>();
+        final Deque<UserAuthException> savedEx = new LinkedList<UserAuthException>();
         for (AuthMethod method: methods) {
+            method.setLoggerFactory(loggerFactory);
             try {
                 if (auth.authenticate(username, (Service) conn, method, trans.getTimeoutMs()))
                     return;
@@ -324,7 +321,7 @@ public class SSHClient
     public void authPublickey(String username)
             throws UserAuthException, TransportException {
         final String base = System.getProperty("user.home") + File.separator + ".ssh" + File.separator;
-        authPublickey(username, base + "id_rsa", base + "id_dsa");
+        authPublickey(username, base + "id_rsa", base + "id_dsa", base + "id_ed25519", base + "id_ecdsa");
     }
 
     /**
@@ -342,7 +339,7 @@ public class SSHClient
      */
     public void authPublickey(String username, Iterable<KeyProvider> keyProviders)
             throws UserAuthException, TransportException {
-        final List<AuthMethod> am = new LinkedList<>();
+        final List<AuthMethod> am = new LinkedList<AuthMethod>();
         for (KeyProvider kp : keyProviders)
             am.add(new AuthPublickey(kp));
         auth(username, am);
@@ -385,7 +382,7 @@ public class SSHClient
      */
     public void authPublickey(String username, String... locations)
             throws UserAuthException, TransportException {
-        final List<KeyProvider> keyProviders = new LinkedList<>();
+        final List<KeyProvider> keyProviders = new LinkedList<KeyProvider>();
         for (String loc : locations) {
             try {
                 log.debug("Attempting to load key from: {}", loc);
@@ -415,7 +412,7 @@ public class SSHClient
     public void authGssApiWithMic(String username, LoginContext context, Oid supportedOid, Oid... supportedOids)
             throws UserAuthException, TransportException {
         // insert supportedOid to the front of the list since ordering matters
-        List<Oid> oids = new ArrayList<>(Arrays.asList(supportedOids));
+        List<Oid> oids = new ArrayList<Oid>(Arrays.asList(supportedOids));
         oids.add(0, supportedOid);
 
         auth(username, new AuthGssApiWithMic(context, oids));
@@ -431,6 +428,14 @@ public class SSHClient
     @Override
     public void disconnect()
             throws IOException {
+        for (LocalPortForwarder forwarder : forwarders) {
+            try {
+                forwarder.close();
+            } catch (IOException e) {
+                log.warn("Error closing forwarder", e);
+            }
+        }
+        forwarders.clear();
         trans.disconnect();
         super.disconnect();
     }
@@ -440,6 +445,15 @@ public class SSHClient
         return conn;
     }
 
+    /**
+     * Returns the character set used to communicate with the remote machine for certain strings (like paths).
+     *
+     * @return remote character set
+     */
+    public Charset getRemoteCharset() {
+        return remoteCharset;
+    }
+
     /** @return a {@link RemotePortForwarder} that allows requesting remote forwarding over this connection. */
     public RemotePortForwarder getRemotePortForwarder() {
         synchronized (conn) {
@@ -524,8 +538,13 @@ public class SSHClient
     }
 
     /**
-     * Creates a {@link KeyProvider} instance from given location on the file system. Currently only PKCS8 format
-     * private key files are supported (OpenSSH uses this format).
+     * Creates a {@link KeyProvider} instance from given location on the file system. Currently the following private key files are supported:
+     * <ul>
+     *     <li>PKCS8 (OpenSSH uses this format)</li>
+     *     <li>PKCS5</li>
+     *     <li>Putty keyfile</li>
+     *     <li>openssh-key-v1 (New OpenSSH keyfile format)</li>
+     * </ul>
      * <p/>
      *
      * @param location       the location of the key file
@@ -630,7 +649,7 @@ public class SSHClient
      */
     public void loadKnownHosts(File location)
             throws IOException {
-        addHostKeyVerifier(new OpenSSHKnownHosts(location));
+        addHostKeyVerifier(new OpenSSHKnownHosts(location, loggerFactory));
     }
 
     /**
@@ -648,7 +667,9 @@ public class SSHClient
      */
     public LocalPortForwarder newLocalPortForwarder(LocalPortForwarder.Parameters parameters,
                                                     ServerSocket serverSocket) {
-        return new LocalPortForwarder(conn, parameters, serverSocket);
+        LocalPortForwarder forwarder = new LocalPortForwarder(conn, parameters, serverSocket, loggerFactory);
+        forwarders.add(forwarder);
+        return forwarder;
     }
 
     /**
@@ -675,7 +696,7 @@ public class SSHClient
     public SCPFileTransfer newSCPFileTransfer() {
         checkConnected();
         checkAuthenticated();
-        return new SCPFileTransfer(this);
+        return new SCPFileTransfer(this, loggerFactory);
     }
 
     /**
@@ -701,12 +722,22 @@ public class SSHClient
         doKex();
     }
 
+    /**
+     * Sets the character set used to communicate with the remote machine for certain strings (like paths)
+     *
+     * @param remoteCharset
+     *        remote character set or {@code null} for default
+     */
+    public void setRemoteCharset(Charset remoteCharset) {
+        this.remoteCharset = remoteCharset != null ? remoteCharset : IOUtils.UTF8;
+    }
+
     @Override
     public Session startSession()
             throws ConnectionException, TransportException {
         checkConnected();
         checkAuthenticated();
-        final SessionChannel sess = new SessionChannel(conn);
+        final SessionChannel sess = new SessionChannel(conn, remoteCharset);
         sess.open();
         return sess;
     }

src/main/java/net/schmizz/sshj/SocketClient.java

@@ -48,12 +48,50 @@ public abstract class SocketClient {
         this.defaultPort = defaultPort;
     }
 
-    public void connect(InetAddress host, int port) throws IOException {
-        socket = socketFactory.createSocket();
-        socket.connect(new InetSocketAddress(host, port), connectTimeout);
+    /**
+     * Connect to a host via a proxy.
+     * @param hostname The host name to connect to.
+     * @param proxy The proxy to connect via.
+     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
+     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
+     */
+    @Deprecated
+    public void connect(String hostname, Proxy proxy) throws IOException {
+        connect(hostname, defaultPort, proxy);
+    }
+
+    /**
+     * Connect to a host via a proxy.
+     * @param hostname The host name to connect to.
+     * @param port The port to connect to.
+     * @param proxy The proxy to connect via.
+     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
+     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
+     */
+    @Deprecated
+    public void connect(String hostname, int port, Proxy proxy) throws IOException {
+        this.hostname = hostname;
+        if (JavaVersion.isJava7OrEarlier() && proxy.type() == Proxy.Type.HTTP) {
+            // Java7 and earlier have no support for HTTP Connect proxies, return our custom socket.
+            socket = new Jdk7HttpProxySocket(proxy);
+        } else {
+            socket = new Socket(proxy);
+        }
+        socket.connect(new InetSocketAddress(hostname, port), connectTimeout);
         onConnect();
     }
 
+    /**
+     * Connect to a host via a proxy.
+     * @param host The host address to connect to.
+     * @param proxy The proxy to connect via.
+     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
+     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
+     */
+    @Deprecated
+    public void connect(InetAddress host, Proxy proxy) throws IOException {
+        connect(host, defaultPort, proxy);
+    }
 
     /**
      * Connect to a host via a proxy.
@@ -75,23 +113,41 @@ public abstract class SocketClient {
         onConnect();
     }
 
-    public void connect(String hostname, int port) throws IOException {
-        this.hostname = hostname;
-        connect(InetAddress.getByName(hostname), port);
+    public void connect(String hostname) throws IOException {
+        connect(hostname, defaultPort);
     }
 
-    /**
-     * Connect to a host via a proxy.
-     * @param hostname The host name to connect to.
-     * @param port The port to connect to.
-     * @param proxy The proxy to connect via.
-     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
-     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
-     */
-    @Deprecated
-    public void connect(String hostname, int port, Proxy proxy) throws IOException {
-        this.hostname = hostname;
-        connect(InetAddress.getByName(hostname), port, proxy);
+    public void connect(String hostname, int port) throws IOException {
+        if (hostname == null) {
+            connect(InetAddress.getByName(null), port);
+        } else {
+            this.hostname = hostname;
+            socket = socketFactory.createSocket();
+            socket.connect(new InetSocketAddress(hostname, port), connectTimeout);
+            onConnect();
+        }
+    }
+
+    public void connect(String hostname, int port, InetAddress localAddr, int localPort) throws IOException {
+        if (hostname == null) {
+            connect(InetAddress.getByName(null), port, localAddr, localPort);
+        } else {
+            this.hostname = hostname;
+            socket = socketFactory.createSocket();
+            socket.bind(new InetSocketAddress(localAddr, localPort));
+            socket.connect(new InetSocketAddress(hostname, port), connectTimeout);
+            onConnect();
+        }
+    }
+
+    public void connect(InetAddress host) throws IOException {
+        connect(host, defaultPort);
+    }
+
+    public void connect(InetAddress host, int port) throws IOException {
+        socket = socketFactory.createSocket();
+        socket.connect(new InetSocketAddress(host, port), connectTimeout);
+        onConnect();
     }
 
     public void connect(InetAddress host, int port, InetAddress localAddr, int localPort)
@@ -102,43 +158,6 @@ public abstract class SocketClient {
         onConnect();
     }
 
-    public void connect(String hostname, int port, InetAddress localAddr, int localPort) throws IOException {
-        this.hostname = hostname;
-        connect(InetAddress.getByName(hostname), port, localAddr, localPort);
-    }
-
-    public void connect(InetAddress host) throws IOException {
-        connect(host, defaultPort);
-    }
-
-    public void connect(String hostname) throws IOException {
-        connect(hostname, defaultPort);
-    }
-
-    /**
-     * Connect to a host via a proxy.
-     * @param host The host address to connect to.
-     * @param proxy The proxy to connect via.
-     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
-     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
-     */
-    @Deprecated
-    public void connect(InetAddress host, Proxy proxy) throws IOException {
-        connect(host, defaultPort, proxy);
-    }
-
-    /**
-     * Connect to a host via a proxy.
-     * @param hostname The host name to connect to.
-     * @param proxy The proxy to connect via.
-     * @deprecated This method will be removed after v0.12.0. If you want to connect via a proxy, you can do this by injecting a {@link javax.net.SocketFactory}
-     *             into the SocketClient. The SocketFactory should create sockets using the {@link java.net.Socket#Socket(java.net.Proxy)} constructor.
-     */
-    @Deprecated
-    public void connect(String hostname, Proxy proxy) throws IOException {
-        connect(hostname, defaultPort, proxy);
-    }
-
     public void disconnect() throws IOException {
         if (socket != null) {
             socket.close();

src/main/java/net/schmizz/sshj/common/Base64.java

@@ -1,18 +1,3 @@
-/*
- * Copyright (C)2009 - SSHJ Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
 package net.schmizz.sshj.common;
 
 
@@ -1742,4 +1727,4 @@ public class Base64 {
     private Base64() {
     }
 
-} // end class Base64
+} // end class Base64

src/main/java/net/schmizz/sshj/common/Buffer.java

@@ -15,8 +15,8 @@
  */
 package net.schmizz.sshj.common;
 
-import java.io.UnsupportedEncodingException;
 import java.math.BigInteger;
+import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.security.PublicKey;
 import java.util.Arrays;
@@ -57,6 +57,11 @@ public class Buffer<T extends Buffer<T>> {
     /** The maximum valid size of buffer (i.e. biggest power of two that can be represented as an int - 2^30) */
     public static final int MAX_SIZE = (1 << 30); 
 
+    /** Maximum size of a uint64 */
+    private static final BigInteger MAX_UINT64_VALUE = BigInteger.ONE
+                                                            .shiftLeft(64)
+                                                            .subtract(BigInteger.ONE);
+
     protected static int getNextPowerOf2(int i) {
         int j = 1;
         while (j < i) {
@@ -311,7 +316,7 @@ public class Buffer<T extends Buffer<T>> {
     public T putUInt32(long uint32) {
         ensureCapacity(4);
         if (uint32 < 0 || uint32 > 0xffffffffL)
-            throw new RuntimeException("Invalid value: " + uint32);
+            throw new IllegalArgumentException("Invalid value: " + uint32);
         data[wpos++] = (byte) (uint32 >> 24);
         data[wpos++] = (byte) (uint32 >> 16);
         data[wpos++] = (byte) (uint32 >> 8);
@@ -343,10 +348,29 @@ public class Buffer<T extends Buffer<T>> {
         return uint64;
     }
 
-    @SuppressWarnings("unchecked")
+    public BigInteger readUInt64AsBigInteger()
+            throws BufferException {
+        byte[] magnitude = new byte[8];
+        readRawBytes(magnitude);
+        return new BigInteger(1, magnitude);
+    }
+
     public T putUInt64(long uint64) {
         if (uint64 < 0)
-            throw new RuntimeException("Invalid value: " + uint64);
+            throw new IllegalArgumentException("Invalid value: " + uint64);
+        return putUInt64Unchecked(uint64);
+    }
+
+    public T putUInt64(BigInteger uint64) {
+        if (uint64.compareTo(MAX_UINT64_VALUE) > 0 ||
+                uint64.compareTo(BigInteger.ZERO) < 0) {
+            throw new IllegalArgumentException("Invalid value: " + uint64);
+        }
+        return putUInt64Unchecked(uint64.longValue());
+    }
+
+    @SuppressWarnings("unchecked")
+    private T putUInt64Unchecked(long uint64) {
         data[wpos++] = (byte) (uint64 >> 56);
         data[wpos++] = (byte) (uint64 >> 48);
         data[wpos++] = (byte) (uint64 >> 40);
@@ -361,24 +385,31 @@ public class Buffer<T extends Buffer<T>> {
     /**
      * Reads an SSH string
      *
+     * @param cs the charset to use for decoding
+     *
      * @return the string as a Java {@code String}
      */
-    public String readString()
+    public String readString(Charset cs)
             throws BufferException {
         int len = readUInt32AsInt();
         if (len < 0 || len > 32768)
             throw new BufferException("Bad item length: " + len);
         ensureAvailable(len);
-        String s;
-        try {
-            s = new String(data, rpos, len, "UTF-8");
-        } catch (UnsupportedEncodingException e) {
-            throw new SSHRuntimeException(e);
-        }
+        String s = new String(data, rpos, len, cs);
         rpos += len;
         return s;
     }
 
+    /**
+     * Reads an SSH string using {@code UTF8}
+     *
+     * @return the string as a Java {@code String}
+     */
+    public String readString()
+            throws BufferException {
+        return readString(IOUtils.UTF8);
+    }
+
     /**
      * Reads an SSH string
      *
@@ -397,8 +428,12 @@ public class Buffer<T extends Buffer<T>> {
         return putBytes(str, offset, len);
     }
 
+    public T putString(String string, Charset cs) {
+        return putString(string.getBytes(cs));
+    }
+
     public T putString(String string) {
-        return putString(string.getBytes(IOUtils.UTF8));
+        return putString(string, IOUtils.UTF8);
     }
 
     /**
@@ -426,8 +461,7 @@ public class Buffer<T extends Buffer<T>> {
     public PublicKey readPublicKey()
             throws BufferException {
         try {
-            final String type = readString();
-            return KeyType.fromString(type).readPubKeyFromBuffer(type, this);
+            return KeyType.fromString(readString()).readPubKeyFromBuffer(this);
         } catch (GeneralSecurityException e) {
             throw new SSHRuntimeException(e);
         }

src/main/java/net/schmizz/sshj/common/IOUtils.java

@@ -15,9 +15,6 @@
  */
 package net.schmizz.sshj.common;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
@@ -26,25 +23,33 @@ import java.nio.charset.Charset;
 
 public class IOUtils {
 
-    private static final Logger LOG = LoggerFactory.getLogger(IOUtils.class);
-
     public static final Charset UTF8 = Charset.forName("UTF-8");
 
     public static void closeQuietly(Closeable... closeables) {
-        for (Closeable c : closeables)
-            try {
-                if (c != null)
-                    c.close();
-            } catch (IOException logged) {
-                LOG.warn("Error closing {} - {}", c, logged);
-            }
+        closeQuietly(LoggerFactory.DEFAULT, closeables);
     }
 
     public static ByteArrayOutputStream readFully(InputStream stream)
             throws IOException {
+        return readFully(stream, LoggerFactory.DEFAULT);
+    }
+
+    public static void closeQuietly(LoggerFactory loggerFactory, Closeable... closeables) {
+        for (Closeable c : closeables) {
+            try {
+                if (c != null)
+                    c.close();
+            } catch (IOException logged) {
+		loggerFactory.getLogger(IOUtils.class).warn("Error closing {} - {}", c, logged);
+            }
+        }
+    }
+
+    public static ByteArrayOutputStream readFully(InputStream stream, LoggerFactory loggerFactory)
+            throws IOException {
         final ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        new StreamCopier(stream, baos).copy();
+        new StreamCopier(stream, baos, loggerFactory).copy();
         return baos;
     }
 
-}
+}

src/main/java/net/schmizz/sshj/common/KeyType.java

@@ -15,13 +15,26 @@
  */
 package net.schmizz.sshj.common;
 
-import com.hierynomus.sshj.secg.SecgUtils;
-import com.hierynomus.sshj.signature.Ed25519PublicKey;
-import net.i2p.crypto.eddsa.EdDSAPublicKey;
-import net.i2p.crypto.eddsa.math.GroupElement;
-import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec;
-import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
-import net.i2p.crypto.eddsa.spec.EdDSAPublicKeySpec;
+import java.math.BigInteger;
+import java.security.GeneralSecurityException;
+import java.security.Key;
+import java.security.KeyFactory;
+import java.security.PublicKey;
+import java.security.interfaces.DSAPrivateKey;
+import java.security.interfaces.DSAPublicKey;
+import java.security.interfaces.ECPublicKey;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.DSAPublicKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Date;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
 import org.bouncycastle.asn1.nist.NISTNamedCurves;
 import org.bouncycastle.asn1.x9.X9ECParameters;
 import org.bouncycastle.jce.spec.ECParameterSpec;
@@ -30,24 +43,23 @@ import org.bouncycastle.math.ec.ECPoint;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.math.BigInteger;
-import java.security.GeneralSecurityException;
-import java.security.Key;
-import java.security.KeyFactory;
-import java.security.PublicKey;
-import java.security.interfaces.*;
-import java.security.spec.DSAPublicKeySpec;
-import java.security.spec.RSAPublicKeySpec;
-import java.util.Arrays;
+import com.hierynomus.sshj.secg.SecgUtils;
+import com.hierynomus.sshj.signature.Ed25519PublicKey;
+import com.hierynomus.sshj.userauth.certificate.Certificate;
+
+import net.i2p.crypto.eddsa.EdDSAPublicKey;
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec;
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
+import net.i2p.crypto.eddsa.spec.EdDSAPublicKeySpec;
+import net.schmizz.sshj.common.Buffer.BufferException;
 
 /** Type of key e.g. rsa, dsa */
 public enum KeyType {
 
-
     /** SSH identifier for RSA keys */
     RSA("ssh-rsa") {
         @Override
-        public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
                 throws GeneralSecurityException {
             final BigInteger e, n;
             try {
@@ -61,24 +73,22 @@ public enum KeyType {
         }
 
         @Override
-        public void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf) {
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
             final RSAPublicKey rsaKey = (RSAPublicKey) pk;
-            buf.putString(sType)
-                    .putMPInt(rsaKey.getPublicExponent()) // e
-                    .putMPInt(rsaKey.getModulus()); // n
+            buf.putMPInt(rsaKey.getPublicExponent()) // e
+                .putMPInt(rsaKey.getModulus()); // n
         }
 
         @Override
         protected boolean isMyType(Key key) {
             return (key instanceof RSAPublicKey || key instanceof RSAPrivateKey);
         }
-
     },
 
     /** SSH identifier for DSA keys */
     DSA("ssh-dss") {
         @Override
-        public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
                 throws GeneralSecurityException {
             BigInteger p, q, g, y;
             try {
@@ -94,10 +104,9 @@ public enum KeyType {
         }
 
         @Override
-        public void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf) {
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
             final DSAPublicKey dsaKey = (DSAPublicKey) pk;
-            buf.putString(sType)
-                    .putMPInt(dsaKey.getParams().getP()) // p
+            buf.putMPInt(dsaKey.getParams().getP()) // p
                     .putMPInt(dsaKey.getParams().getQ()) // q
                     .putMPInt(dsaKey.getParams().getG()) // g
                     .putMPInt(dsaKey.getY()); // y
@@ -115,8 +124,11 @@ public enum KeyType {
         private final Logger log = LoggerFactory.getLogger(getClass());
 
         @Override
-        public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
                 throws GeneralSecurityException {
+            if (!SecurityUtils.isBouncyCastleRegistered()) {
+                throw new GeneralSecurityException("BouncyCastle is required to read a key of type " + sType);
+            }
             try {
                 // final String algo = buf.readString();  it has been already read
                 final String curveName = buf.readString();
@@ -128,7 +140,7 @@ public enum KeyType {
                 buf.readRawBytes(y);
                 if(log.isDebugEnabled()) {
                     log.debug(String.format("Key algo: %s, Key curve: %s, Key Len: %s, 0x04: %s\nx: %s\ny: %s",
-                            type,
+                            sType,
                             curveName,
                             keyLen,
                             x04,
@@ -159,12 +171,11 @@ public enum KeyType {
 
 
         @Override
-        public void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf) {
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
             final ECPublicKey ecdsa = (ECPublicKey) pk;
             byte[] encoded = SecgUtils.getEncoded(ecdsa.getW(), ecdsa.getParams().getCurve());
 
-            buf.putString(sType)
-                .putString(NISTP_CURVE)
+            buf.putString(NISTP_CURVE)
                 .putBytes(encoded);
         }
 
@@ -175,24 +186,23 @@ public enum KeyType {
     },
 
     ED25519("ssh-ed25519") {
-        private final Logger logger = LoggerFactory.getLogger(KeyType.class);
+        private final Logger log = LoggerFactory.getLogger(KeyType.class);
         @Override
-        public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf) throws GeneralSecurityException {
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf) throws GeneralSecurityException {
             try {
                 final int keyLen = buf.readUInt32AsInt();
                 final byte[] p = new byte[keyLen];
                 buf.readRawBytes(p);
-                if (logger.isDebugEnabled()) {
-                    logger.debug(String.format("Key algo: %s, Key curve: 25519, Key Len: %s\np: %s",
-                            type,
+                if (log.isDebugEnabled()) {
+                    log.debug(String.format("Key algo: %s, Key curve: 25519, Key Len: %s\np: %s",
+                            sType,
                             keyLen,
                             Arrays.toString(p))
                     );
                 }
 
-                EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName("ed25519-sha-512");
-                GroupElement point = ed25519.getCurve().createPoint(p, true);
-                EdDSAPublicKeySpec publicSpec = new EdDSAPublicKeySpec(point, ed25519);
+                EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512);
+                EdDSAPublicKeySpec publicSpec = new EdDSAPublicKeySpec(p, ed25519);
                 return new Ed25519PublicKey(publicSpec);
 
             } catch (Buffer.BufferException be) {
@@ -201,9 +211,9 @@ public enum KeyType {
         }
 
         @Override
-        public void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf) {
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
             EdDSAPublicKey key = (EdDSAPublicKey) pk;
-            buf.putString(sType).putBytes(key.getAbyte());
+            buf.putBytes(key.getAbyte());
         }
 
         @Override
@@ -212,12 +222,50 @@ public enum KeyType {
         }
     },
 
+    /** Signed rsa certificate */
+    RSA_CERT("ssh-rsa-cert-v01@openssh.com") {
+        @Override
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
+                throws GeneralSecurityException {
+            return CertUtils.readPubKey(buf, RSA);
+        }
+
+        @Override
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
+            CertUtils.writePubKeyContentsIntoBuffer(pk, RSA, buf);
+        }
+
+        @Override
+        protected boolean isMyType(Key key) {
+            return CertUtils.isCertificateOfType(key, RSA);
+        }
+    },
+
+    /** Signed dsa certificate */
+    DSA_CERT("ssh-dss-cert-v01@openssh.com") {
+        @Override
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
+                throws GeneralSecurityException {
+            return CertUtils.readPubKey(buf, DSA);
+        }
+
+        @Override
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
+            CertUtils.writePubKeyContentsIntoBuffer(pk, DSA, buf);
+        }
+
+        @Override
+        protected boolean isMyType(Key key) {
+            return CertUtils.isCertificateOfType(key, DSA);
+        }
+    },
+
     /** Unrecognized */
     UNKNOWN("unknown") {
         @Override
-        public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
+        public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
                 throws GeneralSecurityException {
-            throw new UnsupportedOperationException("Don't know how to decode key:" + type);
+            throw new UnsupportedOperationException("Don't know how to decode key:" + sType);
         }
 
         @Override
@@ -225,6 +273,11 @@ public enum KeyType {
             throw new UnsupportedOperationException("Don't know how to encode key: " + pk);
         }
 
+        @Override
+        protected void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf) {
+            throw new UnsupportedOperationException("Don't know how to encode key: " + pk);
+        }
+
         @Override
         protected boolean isMyType(Key key) {
             return false;
@@ -240,10 +293,14 @@ public enum KeyType {
         this.sType = type;
     }
 
-    public abstract PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
+    public abstract PublicKey readPubKeyFromBuffer(Buffer<?> buf)
             throws GeneralSecurityException;
 
-    public abstract void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf);
+    protected abstract void writePubKeyContentsIntoBuffer(PublicKey pk, Buffer<?> buf);
+
+    public void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf) {
+        writePubKeyContentsIntoBuffer(pk, buf.putString(sType));
+    }
 
     protected abstract boolean isMyType(Key key);
 
@@ -266,4 +323,128 @@ public enum KeyType {
         return sType;
     }
 
+    static class CertUtils {
+
+        @SuppressWarnings("unchecked")
+        static <T extends PublicKey> Certificate<T> readPubKey(Buffer<?> buf, KeyType innerKeyType) throws GeneralSecurityException {
+            Certificate.Builder<T> builder = Certificate.getBuilder();
+
+            try {
+                builder.nonce(buf.readBytes());
+                builder.publicKey((T) innerKeyType.readPubKeyFromBuffer(buf));
+                builder.serial(buf.readUInt64AsBigInteger());
+                builder.type(buf.readUInt32());
+                builder.id(buf.readString());
+                builder.validPrincipals(unpackList(buf.readBytes()));
+                builder.validAfter(dateFromEpoch(buf.readUInt64()));
+                builder.validBefore(dateFromEpoch(buf.readUInt64()));
+                builder.critOptions(unpackMap(buf.readBytes()));
+                builder.extensions(unpackMap(buf.readBytes()));
+                buf.readString(); // reserved
+                builder.signatureKey(buf.readBytes());
+                builder.signature(buf.readBytes());
+            } catch (Buffer.BufferException be) {
+                throw new GeneralSecurityException(be);
+            }
+
+            return builder.build();
+        }
+
+        static void writePubKeyContentsIntoBuffer(PublicKey publicKey, KeyType innerKeyType, Buffer<?> buf) {
+            Certificate<PublicKey> certificate = toCertificate(publicKey);
+            buf.putBytes(certificate.getNonce());
+            innerKeyType.writePubKeyContentsIntoBuffer(certificate.getKey(), buf);
+            buf.putUInt64(certificate.getSerial())
+                .putUInt32(certificate.getType())
+                .putString(certificate.getId())
+                .putBytes(packList(certificate.getValidPrincipals()))
+                .putUInt64(epochFromDate(certificate.getValidAfter()))
+                .putUInt64(epochFromDate(certificate.getValidBefore()))
+                .putBytes(packMap(certificate.getCritOptions()))
+                .putBytes(packMap(certificate.getExtensions()))
+                .putString("") // reserved
+                .putBytes(certificate.getSignatureKey())
+                .putBytes(certificate.getSignature());
+        }
+
+        static boolean isCertificateOfType(Key key, KeyType innerKeyType) {
+            if (!(key instanceof Certificate)) {
+                return false;
+            }
+            @SuppressWarnings("unchecked")
+            Key innerKey = ((Certificate<PublicKey>) key).getKey();
+            return innerKeyType.isMyType(innerKey);
+        }
+
+        @SuppressWarnings("unchecked")
+        static Certificate<PublicKey> toCertificate(PublicKey key) {
+            if (!(key instanceof Certificate)) {
+                throw new UnsupportedOperationException("Can't convert non-certificate key " +
+                                                        key.getAlgorithm() + " to certificate");
+            }
+            return ((Certificate<PublicKey>) key);
+        }
+
+        private static Date dateFromEpoch(long seconds) {
+            return new Date(seconds * 1000);
+        }
+
+        private static long epochFromDate(Date date) {
+            return date.getTime() / 1000;
+        }
+
+        private static String unpackString(byte[] packedString) throws BufferException {
+            if (packedString.length == 0) {
+                return "";
+            }
+            return new Buffer.PlainBuffer(packedString).readString();
+        }
+
+        private static List<String> unpackList(byte[] packedString) throws BufferException {
+            List<String> list = new ArrayList<String>();
+            Buffer<?> buf = new Buffer.PlainBuffer(packedString);
+            while (buf.available() > 0) {
+                list.add(buf.readString());
+            }
+            return list;
+        }
+
+        private static Map<String, String> unpackMap(byte[] packedString) throws BufferException {
+            Map<String, String> map = new LinkedHashMap<String, String>();
+            Buffer<?> buf = new Buffer.PlainBuffer(packedString);
+            while (buf.available() > 0) {
+                String name = buf.readString();
+                String data = unpackString(buf.readStringAsBytes());
+                map.put(name, data);
+            }
+            return map;
+        }
+
+        private static byte[] packString(String data) {
+            if (data == null || data.isEmpty()) {
+                return "".getBytes();
+            }
+            return new Buffer.PlainBuffer().putString(data).getCompactData();
+        }
+
+        private static byte[] packList(Iterable<String> strings) {
+            Buffer<?> buf = new Buffer.PlainBuffer();
+            for (String string : strings) {
+                buf.putString(string);
+            }
+            return buf.getCompactData();
+        }
+
+        private static byte[] packMap(Map<String, String> map) {
+            Buffer<?> buf = new Buffer.PlainBuffer();
+            List<String> keys = new ArrayList<String>(map.keySet());
+            Collections.sort(keys);
+            for (String key : keys) {
+                buf.putString(key);
+                String value = map.get(key);
+                buf.putString(packString(value));
+            }
+            return buf.getCompactData();
+        }
+    }
 }

src/main/java/net/schmizz/sshj/common/LoggerFactory.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.schmizz.sshj.common;
+
+import org.slf4j.Logger;
+
+public interface LoggerFactory {
+    Logger getLogger(String name);
+    Logger getLogger(Class<?> clazz);
+
+    /**
+     * Default SLF4J-based implementation of the SSHJ LoggerFactory.
+     */
+    LoggerFactory DEFAULT = new LoggerFactory() {
+        @Override
+        public Logger getLogger(String name) {
+            return org.slf4j.LoggerFactory.getLogger(name);
+        }
+
+        @Override
+        public Logger getLogger(Class<?> clazz) {
+            return org.slf4j.LoggerFactory.getLogger(clazz);
+        }
+    };
+}

src/main/java/net/schmizz/sshj/common/SSHRuntimeException.java

@@ -34,7 +34,7 @@ public class SSHRuntimeException
     }
 
     public SSHRuntimeException(Throwable cause) {
-        this(null, cause);
+        this(cause.getMessage(), cause);
     }
 
 }

src/main/java/net/schmizz/sshj/common/SecurityUtils.java

@@ -15,47 +15,25 @@
  */
 package net.schmizz.sshj.common;
 
-import org.bouncycastle.jce.provider.BouncyCastleProvider;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import java.security.*;
 import javax.crypto.Cipher;
 import javax.crypto.KeyAgreement;
 import javax.crypto.Mac;
 import javax.crypto.NoSuchPaddingException;
-import java.security.GeneralSecurityException;
-import java.security.KeyFactory;
-import java.security.KeyPairGenerator;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.PublicKey;
-import java.security.Signature;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
-// TODO refactor
+import static java.lang.String.format;
 
-/** Static utility method relating to security facilities. */
+/**
+ * Static utility method relating to security facilities.
+ */
 public class SecurityUtils {
-
-    private static class BouncyCastleRegistration {
-
-        public void run()
-                throws Exception {
-            if (java.security.Security.getProvider(BOUNCY_CASTLE) == null) {
-                LOG.debug("Trying to register BouncyCastle as a JCE provider");
-                java.security.Security.addProvider(new BouncyCastleProvider());
-                MessageDigest.getInstance("MD5", BOUNCY_CASTLE);
-                KeyAgreement.getInstance("DH", BOUNCY_CASTLE);
-                LOG.info("BouncyCastle registration succeeded");
-            } else
-                LOG.info("BouncyCastle already registered as a JCE provider");
-            securityProvider = BOUNCY_CASTLE;
-        }
-    }
-
     private static final Logger LOG = LoggerFactory.getLogger(SecurityUtils.class);
 
-    /** Identifier for the BouncyCastle JCE provider */
+    /**
+     * Identifier for the BouncyCastle JCE provider
+     */
     public static final String BOUNCY_CASTLE = "BC";
 
     /*
@@ -67,6 +45,42 @@ public class SecurityUtils {
     private static Boolean registerBouncyCastle;
     private static boolean registrationDone;
 
+    public static boolean registerSecurityProvider(String providerClassName) {
+        Provider provider = null;
+        try {
+            Class<?> name = Class.forName(providerClassName);
+            provider = (Provider) name.newInstance();
+        } catch (ClassNotFoundException e) {
+            LOG.info("Security Provider class '{}' not found", providerClassName);
+        } catch (InstantiationException e) {
+            LOG.info("Security Provider class '{}' could not be created", providerClassName);
+        } catch (IllegalAccessException e) {
+            LOG.info("Security Provider class '{}' could not be accessed", providerClassName);
+        }
+
+        if (provider == null) {
+            return false;
+        }
+
+        try {
+            if (Security.getProvider(provider.getName()) == null) {
+                Security.addProvider(provider);
+            }
+
+            if (securityProvider == null) {
+                MessageDigest.getInstance("MD5", provider.getName());
+                KeyAgreement.getInstance("DH", provider.getName());
+                setSecurityProvider(provider.getName());
+                return true;
+            }
+        } catch (NoSuchAlgorithmException e) {
+            LOG.info(format("Security Provider '%s' does not support necessary algorithm", providerClassName), e);
+        } catch (NoSuchProviderException e) {
+            LOG.info("Registration of Security Provider '{}' unexpectedly failed", providerClassName);
+        }
+        return false;
+    }
+
     public static synchronized Cipher getCipher(String transformation)
             throws NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException {
         register();
@@ -80,9 +94,7 @@ public class SecurityUtils {
      * Computes the fingerprint for a public key, in the standard SSH format, e.g. "4b:69:6c:72:6f:79:20:77:61:73:20:68:65:72:65:21"
      *
      * @param key the public key
-     *
      * @return the fingerprint
-     *
      * @see <a href="http://tools.ietf.org/html/draft-friedl-secsh-fingerprint-00">specification</a>
      */
     public static String getFingerprint(PublicKey key) {
@@ -105,9 +117,7 @@ public class SecurityUtils {
      * Creates a new instance of {@link KeyAgreement} with the given algorithm.
      *
      * @param algorithm key agreement algorithm
-     *
      * @return new instance
-     *
      * @throws NoSuchAlgorithmException
      * @throws NoSuchProviderException
      */
@@ -124,9 +134,7 @@ public class SecurityUtils {
      * Creates a new instance of {@link KeyFactory} with the given algorithm.
      *
      * @param algorithm key factory algorithm e.g. RSA, DSA
-     *
      * @return new instance
-     *
      * @throws NoSuchAlgorithmException
      * @throws NoSuchProviderException
      */
@@ -143,9 +151,7 @@ public class SecurityUtils {
      * Creates a new instance of {@link KeyPairGenerator} with the given algorithm.
      *
      * @param algorithm key pair generator algorithm
-     *
      * @return new instance
-     *
      * @throws NoSuchAlgorithmException
      * @throws NoSuchProviderException
      */
@@ -162,9 +168,7 @@ public class SecurityUtils {
      * Create a new instance of {@link Mac} with the given algorithm.
      *
      * @param algorithm MAC algorithm
-     *
      * @return new instance
-     *
      * @throws NoSuchAlgorithmException
      * @throws NoSuchProviderException
      */
@@ -181,9 +185,7 @@ public class SecurityUtils {
      * Create a new instance of {@link MessageDigest} with the given algorithm.
      *
      * @param algorithm MessageDigest algorithm name
-     *
      * @return new instance
-     *
      * @throws NoSuchAlgorithmException
      * @throws NoSuchProviderException
      */
@@ -243,20 +245,16 @@ public class SecurityUtils {
 
     private static void register() {
         if (!registrationDone) {
-            if (securityProvider == null && (registerBouncyCastle == null || registerBouncyCastle))
-                // Use an inner class to avoid a strong dependency on BouncyCastle
-                try {
-                    new BouncyCastleRegistration().run();
-                } catch (Throwable t) {
-                    if (registerBouncyCastle == null)
-                        LOG.info("BouncyCastle not registered, using the default JCE provider");
-                    else {
-                        LOG.error("Failed to register BouncyCastle as the defaut JCE provider");
-                        throw new SSHRuntimeException("Failed to register BouncyCastle as the defaut JCE provider", t);
-                    }
+            if (securityProvider == null && (registerBouncyCastle == null || registerBouncyCastle)) {
+                registerSecurityProvider("org.bouncycastle.jce.provider.BouncyCastleProvider");
+                if (securityProvider == null && registerBouncyCastle == null) {
+                    LOG.info("BouncyCastle not registered, using the default JCE provider");
+                } else if (securityProvider == null) {
+                    LOG.error("Failed to register BouncyCastle as the defaut JCE provider");
+                    throw new SSHRuntimeException("Failed to register BouncyCastle as the defaut JCE provider");
                 }
+            }
             registrationDone = true;
         }
     }
-
-}
+}

src/main/java/net/schmizz/sshj/common/StreamCopier.java

@@ -18,7 +18,6 @@ package net.schmizz.sshj.common;
 import net.schmizz.concurrent.Event;
 import net.schmizz.concurrent.ExceptionChainer;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -39,8 +38,8 @@ public class StreamCopier {
         }
     };
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
+    private final LoggerFactory loggerFactory;
+    private final Logger log;
     private final InputStream in;
     private final OutputStream out;
 
@@ -50,9 +49,11 @@ public class StreamCopier {
     private boolean keepFlushing = true;
     private long length = -1;
 
-    public StreamCopier(InputStream in, OutputStream out) {
+    public StreamCopier(InputStream in, OutputStream out, LoggerFactory loggerFactory) {
         this.in = in;
         this.out = out;
+        this.loggerFactory = loggerFactory;
+        this.log = loggerFactory.getLogger(getClass());
     }
 
     public StreamCopier bufSize(int bufSize) {
@@ -66,8 +67,11 @@ public class StreamCopier {
     }
 
     public StreamCopier listener(Listener listener) {
-        if (listener == null) listener = NULL_LISTENER;
-        this.listener = listener;
+        if (listener == null) {
+            this.listener = NULL_LISTENER;
+        } else {
+            this.listener = listener;
+        }
         return this;
     }
 
@@ -91,7 +95,7 @@ public class StreamCopier {
                     public IOException chain(Throwable t) {
                         return (t instanceof IOException) ? (IOException) t : new IOException(t);
                     }
-                });
+                }, loggerFactory);
 
         new Thread() {
             {
@@ -107,7 +111,7 @@ public class StreamCopier {
                     log.debug("Done copying from {}", in);
                     doneEvent.set();
                 } catch (IOException ioe) {
-                    log.error("In pipe from {} to {}: {}", in, out, ioe);
+                    log.error(String.format("In pipe from %1$s to %2$s", in.toString(), out.toString()), ioe);
                     doneEvent.deliverError(ioe);
                 }
             }
@@ -124,11 +128,13 @@ public class StreamCopier {
         final long startTime = System.currentTimeMillis();
 
         if (length == -1) {
-            while ((read = in.read(buf)) != -1)
-                count = write(buf, count, read);
+            while ((read = in.read(buf)) != -1) {
+                count += write(buf, count, read);
+            }
         } else {
-            while (count < length && (read = in.read(buf, 0, (int) Math.min(bufSize, length - count))) != -1)
-                count = write(buf, count, read);
+            while (count < length && (read = in.read(buf, 0, (int) Math.min(bufSize, length - count))) != -1) {
+                count += write(buf, count, read);
+            }
         }
 
         if (!keepFlushing)
@@ -136,7 +142,7 @@ public class StreamCopier {
 
         final double timeSeconds = (System.currentTimeMillis() - startTime) / 1000.0;
         final double sizeKiB = count / 1024.0;
-        log.debug("{} KiB transferred in {} seconds ({} KiB/s)", sizeKiB, timeSeconds, (sizeKiB / timeSeconds));
+        log.debug(String.format("%1$,.1f KiB transferred in %2$,.1f seconds (%3$,.2f KiB/s)", sizeKiB, timeSeconds, (sizeKiB / timeSeconds)));
 
         if (length != -1 && read == -1)
             throw new IOException("Encountered EOF, could not transfer " + length + " bytes");
@@ -144,14 +150,13 @@ public class StreamCopier {
         return count;
     }
 
-    private long write(byte[] buf, long count, int read)
+    private long write(byte[] buf, long curPos, int len)
             throws IOException {
-        out.write(buf, 0, read);
-        count += read;
+        out.write(buf, 0, len);
         if (keepFlushing)
             out.flush();
-        listener.reportProgress(count);
-        return count;
+        listener.reportProgress(curPos + len);
+        return len;
     }
 
 }

src/main/java/net/schmizz/sshj/connection/Connection.java

@@ -156,4 +156,4 @@ public interface Connection {
      * @return The configured {@link net.schmizz.keepalive.KeepAlive} mechanism.
      */
     KeepAlive getKeepAlive();
-}
+}

src/main/java/net/schmizz/sshj/connection/ConnectionImpl.java

@@ -20,12 +20,7 @@ import net.schmizz.concurrent.Promise;
 import net.schmizz.keepalive.KeepAlive;
 import net.schmizz.keepalive.KeepAliveProvider;
 import net.schmizz.sshj.AbstractService;
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.ErrorNotifiable;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.connection.channel.Channel;
 import net.schmizz.sshj.connection.channel.OpenFailException.Reason;
 import net.schmizz.sshj.connection.channel.forwarded.ForwardedChannelOpener;
@@ -131,10 +126,9 @@ public class ConnectionImpl
     @Override
     public void handle(Message msg, SSHPacket buf)
             throws SSHException {
-        if (msg.in(91, 100))
+        if (msg.in(91, 100)) {
             getChannel(buf).handle(msg, buf);
-
-        else if (msg.in(80, 90))
+        } else if (msg.in(80, 90)) {
             switch (msg) {
                 case REQUEST_SUCCESS:
                     gotGlobalReqResponse(buf);
@@ -147,10 +141,11 @@ public class ConnectionImpl
                     break;
                 default:
                     super.handle(msg, buf);
+                    break;
             }
-
-        else
+        } else {
             super.handle(msg, buf);
+        }
     }
 
     @Override
@@ -179,11 +174,11 @@ public class ConnectionImpl
     }
 
     @Override
-    public void join()
-            throws InterruptedException {
+    public void join() throws InterruptedException {
         synchronized (internalSynchronizer) {
-            while (!channels.isEmpty())
+            while (!channels.isEmpty()) {
                 internalSynchronizer.wait();
+            }
         }
     }
 
@@ -204,7 +199,7 @@ public class ConnectionImpl
 
             Promise<SSHPacket, ConnectionException> promise = null;
             if (wantReply) {
-                promise = new Promise<SSHPacket, ConnectionException>("global req for " + name, ConnectionException.chainer);
+                promise = new Promise<SSHPacket, ConnectionException>("global req for " + name, ConnectionException.chainer, trans.getConfig().getLoggerFactory());
                 globalReqPromises.add(promise);
             }
             return promise;

src/main/java/net/schmizz/sshj/connection/channel/AbstractChannel.java

@@ -17,22 +17,16 @@ package net.schmizz.sshj.connection.channel;
 
 import net.schmizz.concurrent.ErrorDeliveryUtil;
 import net.schmizz.concurrent.Event;
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.ByteArrayUtils;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.IOUtils;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.connection.Connection;
 import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.transport.Transport;
 import net.schmizz.sshj.transport.TransportException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
 import java.util.LinkedList;
 import java.util.Queue;
 import java.util.concurrent.TimeUnit;
@@ -44,7 +38,8 @@ public abstract class AbstractChannel
     private static final int REMOTE_MAX_PACKET_SIZE_CEILING = 1024 * 1024;
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final LoggerFactory loggerFactory;
+    protected final Logger log;
 
     /** Transport layer */
     protected final Transport trans;
@@ -57,6 +52,10 @@ public abstract class AbstractChannel
     private final int id;
     /** Remote recipient ID */
     private int recipient;
+    /** Remote character set */
+    private final Charset remoteCharset;
+
+    private boolean eof = false;
 
     private final Queue<Event<ConnectionException>> chanReqResponseEvents = new LinkedList<Event<ConnectionException>>();
 
@@ -82,22 +81,28 @@ public abstract class AbstractChannel
     private volatile boolean autoExpand = false;
 
     protected AbstractChannel(Connection conn, String type) {
+        this(conn, type, null);
+    }
+    protected AbstractChannel(Connection conn, String type, Charset remoteCharset) {
         this.conn = conn;
+        this.loggerFactory = conn.getTransport().getConfig().getLoggerFactory();
         this.type = type;
+        this.log = loggerFactory.getLogger(getClass());
         this.trans = conn.getTransport();
 
+        this.remoteCharset = remoteCharset != null ? remoteCharset : IOUtils.UTF8;
         id = conn.nextID();
 
-        lwin = new Window.Local(conn.getWindowSize(), conn.getMaxPacketSize());
+        lwin = new Window.Local(conn.getWindowSize(), conn.getMaxPacketSize(), loggerFactory);
         in = new ChannelInputStream(this, trans, lwin);
 
-        openEvent = new Event<ConnectionException>("chan#" + id + " / " + "open", ConnectionException.chainer, openCloseLock);
-        closeEvent = new Event<ConnectionException>("chan#" + id + " / " + "close", ConnectionException.chainer, openCloseLock);
+        openEvent = new Event<ConnectionException>("chan#" + id + " / " + "open", ConnectionException.chainer, openCloseLock, loggerFactory);
+        closeEvent = new Event<ConnectionException>("chan#" + id + " / " + "close", ConnectionException.chainer, openCloseLock, loggerFactory);
     }
 
     protected void init(int recipient, long remoteWinSize, long remoteMaxPacketSize) {
         this.recipient = recipient;
-        rwin = new Window.Remote(remoteWinSize, (int) Math.min(remoteMaxPacketSize, REMOTE_MAX_PACKET_SIZE_CEILING));
+        rwin = new Window.Remote(remoteWinSize, (int) Math.min(remoteMaxPacketSize, REMOTE_MAX_PACKET_SIZE_CEILING), loggerFactory);
         out = new ChannelOutputStream(this, trans, rwin);
         log.debug("Initialized - {}", this);
     }
@@ -137,6 +142,11 @@ public abstract class AbstractChannel
         return recipient;
     }
 
+    @Override
+    public Charset getRemoteCharset() {
+        return remoteCharset;
+    }
+
     @Override
     public int getRemoteMaxPacketSize() {
         return rwin.getMaxPacketSize();
@@ -191,10 +201,20 @@ public abstract class AbstractChannel
 
             default:
                 gotUnknown(msg, buf);
-
+                break;
         }
     }
 
+    @Override
+    public boolean isEOF() {
+        return eof;
+    }
+
+    @Override
+    public LoggerFactory getLoggerFactory() {
+        return loggerFactory;
+    }
+
     private void gotClose()
             throws TransportException {
         log.debug("Got close");
@@ -321,6 +341,8 @@ public abstract class AbstractChannel
 
     protected void gotUnknown(Message msg, SSHPacket buf)
             throws ConnectionException, TransportException {
+        log.warn("Got unknown packet with type {}", msg);
+
     }
 
     protected void handleRequest(String reqType, SSHPacket buf)
@@ -362,7 +384,7 @@ public abstract class AbstractChannel
             Event<ConnectionException> responseEvent = null;
             if (wantReply) {
                 responseEvent = new Event<ConnectionException>("chan#" + id + " / " + "chanreq for " + reqType,
-                                                               ConnectionException.chainer);
+                                                               ConnectionException.chainer, loggerFactory);
                 chanReqResponseEvents.add(responseEvent);
             }
             return responseEvent;
@@ -393,6 +415,7 @@ public abstract class AbstractChannel
     /** Called when EOF has been received. Subclasses can override but must call super. */
     protected void eofInputStreams() {
         in.eof();
+        eof = true;
     }
 
     @Override
@@ -402,4 +425,4 @@ public abstract class AbstractChannel
     }
 
 
-}
+}

src/main/java/net/schmizz/sshj/connection/channel/Channel.java

@@ -16,6 +16,7 @@
 package net.schmizz.sshj.connection.channel;
 
 import net.schmizz.sshj.common.ErrorNotifiable;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHPacketHandler;
 import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.transport.TransportException;
@@ -23,15 +24,18 @@ import net.schmizz.sshj.transport.TransportException;
 import java.io.Closeable;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
 import java.util.concurrent.TimeUnit;
 
-/** A channel is the basic medium for application-layer data on top of an SSH transport. */
-public interface Channel
-        extends Closeable, SSHPacketHandler, ErrorNotifiable {
+/**
+ * A channel is the basic medium for application-layer data on top of an SSH transport.
+ */
+public interface Channel extends Closeable, SSHPacketHandler, ErrorNotifiable {
 
-    /** Direct channels are those that are initiated by us. */
-    interface Direct
-            extends Channel {
+    /**
+     * Direct channels are those that are initiated by us.
+     */
+    interface Direct extends Channel {
 
         /**
          * Request opening this channel from remote end.
@@ -40,27 +44,30 @@ public interface Channel
          * @throws ConnectionException other connection-layer error
          * @throws TransportException  error writing packets etc.
          */
-        void open()
-                throws ConnectionException, TransportException;
+        void open() throws ConnectionException, TransportException;
 
     }
 
-    /** Forwarded channels are those that are initiated by the server. */
-    interface Forwarded
-            extends Channel {
+    /**
+     * Forwarded channels are those that are initiated by the server.
+     */
+    interface Forwarded extends Channel {
 
         /**
          * Confirm {@code CHANNEL_OPEN} request.
          *
          * @throws TransportException error sending confirmation packet
          */
-        void confirm()
-                throws TransportException;
+        void confirm() throws TransportException;
 
-        /** @return the IP of where the forwarded connection originates. */
+        /**
+         * @return the IP of where the forwarded connection originates.
+         */
         String getOriginatorIP();
 
-        /** @return port from which the forwarded connection originates. */
+        /**
+         * @return port from which the forwarded connection originates.
+         */
         int getOriginatorPort();
 
         /**
@@ -68,55 +75,76 @@ public interface Channel
          *
          * @param reason  indicate {@link OpenFailException.Reason reason} for rejection of the request
          * @param message indicate a message for why the request is rejected
-         *
          * @throws TransportException error sending rejection packet
          */
-        void reject(OpenFailException.Reason reason, String message)
-                throws TransportException;
+        void reject(OpenFailException.Reason reason, String message) throws TransportException;
 
     }
 
 
-    /** Close this channel. */
+    /**
+     * Close this channel.
+     */
     @Override
-    void close()
-            throws TransportException, ConnectionException;
+    void close() throws TransportException, ConnectionException;
 
     /**
      * @return whether auto-expansion of local window is set.
-     *
      * @see #setAutoExpand(boolean)
      */
     boolean getAutoExpand();
 
-    /** @return the channel ID */
+    /**
+     * @return the channel ID
+     */
     int getID();
 
-    /** @return the {@code InputStream} for this channel. */
+    /**
+     * @return the {@code InputStream} for this channel.
+     */
     InputStream getInputStream();
 
-    /** @return the maximum packet size that we have specified. */
+    /**
+     * @return the maximum packet size that we have specified.
+     */
     int getLocalMaxPacketSize();
 
-    /** @return the current local window size. */
+    /**
+     * @return the current local window size.
+     */
     long getLocalWinSize();
 
-    /** @return an {@code OutputStream} for this channel. */
+    /**
+     * @return an {@code OutputStream} for this channel.
+     */
     OutputStream getOutputStream();
 
-    /** @return the channel ID at the remote end. */
+    /**
+     * @return the channel ID at the remote end.
+     */
     int getRecipient();
 
-    /** @return the maximum packet size as specified by the remote end. */
+    /** @return the character set used to communicate with the remote machine for certain strings (like paths). */
+    Charset getRemoteCharset();
+
+    /**
+     * @return the maximum packet size as specified by the remote end.
+     */
     int getRemoteMaxPacketSize();
 
-    /** @return the current remote window size. */
+    /**
+     * @return the current remote window size.
+     */
     long getRemoteWinSize();
 
-    /** @return the channel type identifier. */
+    /**
+     * @return the channel type identifier.
+     */
     String getType();
 
-    /** @return whether the channel is open. */
+    /**
+     * @return whether the channel is open.
+     */
     boolean isOpen();
 
     /**
@@ -128,10 +156,17 @@ public interface Channel
      */
     void setAutoExpand(boolean autoExpand);
 
-    void join()
-            throws ConnectionException;
+    void join() throws ConnectionException;
 
-    void join(long timeout, TimeUnit unit)
-            throws ConnectionException;
+    void join(long timeout, TimeUnit unit) throws ConnectionException;
 
+    /**
+     * Returns whether EOF has been received.
+     */
+    boolean isEOF();
+
+    /**
+     * Get the LoggerFactory associated with the SSH client.
+     */
+    LoggerFactory getLoggerFactory();
 }

src/main/java/net/schmizz/sshj/connection/channel/ChannelInputStream.java

@@ -15,16 +15,11 @@
  */
 package net.schmizz.sshj.connection.channel;
 
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.ErrorNotifiable;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.transport.Transport;
 import net.schmizz.sshj.transport.TransportException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -38,7 +33,7 @@ public final class ChannelInputStream
         extends InputStream
         implements ErrorNotifiable {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
+    private final Logger log;
 
     private final Channel chan;
     private final Transport trans;
@@ -51,6 +46,7 @@ public final class ChannelInputStream
 
     public ChannelInputStream(Channel chan, Transport trans, Window.Local win) {
         this.chan = chan;
+        log = chan.getLoggerFactory().getLogger(getClass());
         this.trans = trans;
         this.win = win;
         buf = new Buffer.PlainBuffer(chan.getLocalMaxPacketSize());

src/main/java/net/schmizz/sshj/connection/channel/ChannelOutputStream.java

@@ -15,11 +15,7 @@
  */
 package net.schmizz.sshj.connection.channel;
 
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.ErrorNotifiable;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.transport.Transport;
 import net.schmizz.sshj.transport.TransportException;
@@ -31,9 +27,7 @@ import java.io.OutputStream;
  * {@link OutputStream} for channels. Buffers data upto the remote window's maximum packet size. Data can also be
  * flushed via {@link #flush()} and is also flushed on {@link #close()}.
  */
-public final class ChannelOutputStream
-        extends OutputStream
-        implements ErrorNotifiable {
+public final class ChannelOutputStream extends OutputStream implements ErrorNotifiable {
 
     private final Channel chan;
     private final Transport trans;
@@ -60,8 +54,7 @@ public final class ChannelOutputStream
             dataOffset = packet.wpos();
         }
 
-        int write(byte[] data, int off, int len)
-                throws TransportException, ConnectionException {
+        int write(byte[] data, int off, int len) throws TransportException, ConnectionException {
             final int bufferSize = packet.wpos() - dataOffset;
             if (bufferSize >= win.getMaxPacketSize()) {
                 flush(bufferSize, true);
@@ -73,15 +66,13 @@ public final class ChannelOutputStream
             }
         }
 
-        boolean flush(boolean canAwaitExpansion)
-                throws TransportException, ConnectionException {
+        boolean flush(boolean canAwaitExpansion) throws TransportException, ConnectionException {
             return flush(packet.wpos() - dataOffset, canAwaitExpansion);
         }
 
-        boolean flush(int bufferSize, boolean canAwaitExpansion)
-                throws TransportException, ConnectionException {
-            while (bufferSize > 0) {
-
+        boolean flush(int bufferSize, boolean canAwaitExpansion) throws TransportException, ConnectionException {
+            int dataLeft = bufferSize;
+            while (dataLeft > 0) {
                 long remoteWindowSize = win.getSize();
                 if (remoteWindowSize == 0) {
                     if (canAwaitExpansion) {
@@ -95,7 +86,7 @@ public final class ChannelOutputStream
                 // a) how much data we have
                 // b) the max packet size
                 // c) what the current window size will allow
-                final int writeNow = Math.min(bufferSize, (int) Math.min(win.getMaxPacketSize(), remoteWindowSize));
+                final int writeNow = Math.min(dataLeft, (int) Math.min(win.getMaxPacketSize(), remoteWindowSize));
 
                 packet.wpos(headerOffset);
                 packet.putMessageID(Message.CHANNEL_DATA);
@@ -103,7 +94,7 @@ public final class ChannelOutputStream
                 packet.putUInt32(writeNow);
                 packet.wpos(dataOffset + writeNow);
 
-                final int leftOverBytes = bufferSize - writeNow;
+                final int leftOverBytes = dataLeft - writeNow;
                 if (leftOverBytes > 0) {
                     leftOvers.putRawBytes(packet.array(), packet.wpos(), leftOverBytes);
                 }
@@ -119,7 +110,7 @@ public final class ChannelOutputStream
                     leftOvers.clear();
                 }
 
-                bufferSize = leftOverBytes;
+                dataLeft = leftOverBytes;
             }
 
             return true;
@@ -144,10 +135,12 @@ public final class ChannelOutputStream
     public synchronized void write(final byte[] data, int off, int len)
             throws IOException {
         checkClose();
-        while (len > 0) {
-            final int n = buffer.write(data, off, len);
-            off += n;
-            len -= n;
+        int length = len;
+        int offset = off;
+        while (length > 0) {
+            final int n = buffer.write(data, offset, length);
+            offset += n;
+            length -= n;
         }
     }
 
@@ -186,8 +179,7 @@ public final class ChannelOutputStream
      * @throws IOException
      */
     @Override
-    public synchronized void flush()
-            throws IOException {
+    public synchronized void flush() throws IOException {
         checkClose();
         buffer.flush(true);
     }

src/main/java/net/schmizz/sshj/connection/channel/Window.java

@@ -15,14 +15,14 @@
  */
 package net.schmizz.sshj.connection.channel;
 
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHRuntimeException;
 import net.schmizz.sshj.connection.ConnectionException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 public abstract class Window {
 
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final Logger log;
 
     protected final Object lock = new Object();
 
@@ -30,9 +30,10 @@ public abstract class Window {
 
     protected long size;
 
-    public Window(long initialWinSize, int maxPacketSize) {
+    public Window(long initialWinSize, int maxPacketSize, LoggerFactory loggerFactory) {
         size = initialWinSize;
         this.maxPacketSize = maxPacketSize;
+        log = loggerFactory.getLogger(getClass());
     }
 
     public void expand(long inc) {
@@ -72,8 +73,8 @@ public abstract class Window {
     public static final class Remote
             extends Window {
 
-        public Remote(long initialWinSize, int maxPacketSize) {
-            super(initialWinSize, maxPacketSize);
+        public Remote(long initialWinSize, int maxPacketSize, LoggerFactory loggerFactory) {
+            super(initialWinSize, maxPacketSize, loggerFactory);
         }
 
         public long awaitExpansion(long was)
@@ -108,8 +109,8 @@ public abstract class Window {
         private final long initialSize;
         private final long threshold;
 
-        public Local(long initialWinSize, int maxPacketSize) {
-            super(initialWinSize, maxPacketSize);
+        public Local(long initialWinSize, int maxPacketSize, LoggerFactory loggerFactory) {
+            super(initialWinSize, maxPacketSize, loggerFactory);
             this.initialSize = initialWinSize;
             threshold = Math.min(maxPacketSize * 20, initialSize / 4);
         }

src/main/java/net/schmizz/sshj/connection/channel/direct/AbstractDirectChannel.java

@@ -25,6 +25,7 @@ import net.schmizz.sshj.connection.channel.Channel;
 import net.schmizz.sshj.connection.channel.OpenFailException;
 import net.schmizz.sshj.transport.TransportException;
 
+import java.nio.charset.Charset;
 import java.util.concurrent.TimeUnit;
 
 /** Base class for direct channels whose open is initated by the client. */
@@ -41,6 +42,15 @@ public abstract class AbstractDirectChannel
         conn.attach(this);
     }
 
+    protected AbstractDirectChannel(Connection conn, String type, Charset remoteCharset) {
+        super(conn, type, remoteCharset);
+
+        /*
+         * We expect to receive channel open confirmation/rejection and want to be able to next this packet.
+         */
+        conn.attach(this);
+    }
+
     @Override
     public void open()
             throws ConnectionException, TransportException {
@@ -94,4 +104,4 @@ public abstract class AbstractDirectChannel
         }
     }
 
-}
+}

src/main/java/net/schmizz/sshj/connection/channel/direct/LocalPortForwarder.java

@@ -17,17 +17,17 @@ package net.schmizz.sshj.connection.channel.direct;
 
 import net.schmizz.concurrent.Event;
 import net.schmizz.sshj.common.IOUtils;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHPacket;
 import net.schmizz.sshj.common.StreamCopier;
 import net.schmizz.sshj.connection.Connection;
 import net.schmizz.sshj.connection.channel.SocketStreamCopyMonitor;
-
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketException;
 import java.util.concurrent.TimeUnit;
 
 import static com.hierynomus.sshj.backport.Sockets.asCloseable;
@@ -82,10 +82,10 @@ public class LocalPortForwarder {
                 throws IOException {
             socket.setSendBufferSize(getLocalMaxPacketSize());
             socket.setReceiveBufferSize(getRemoteMaxPacketSize());
-            final Event<IOException> soc2chan = new StreamCopier(socket.getInputStream(), getOutputStream())
+            final Event<IOException> soc2chan = new StreamCopier(socket.getInputStream(), getOutputStream(), loggerFactory)
                     .bufSize(getRemoteMaxPacketSize())
                     .spawnDaemon("soc2chan");
-            final Event<IOException> chan2soc = new StreamCopier(getInputStream(), socket.getOutputStream())
+            final Event<IOException> chan2soc = new StreamCopier(getInputStream(), socket.getOutputStream(), loggerFactory)
                     .bufSize(getLocalMaxPacketSize())
                     .spawnDaemon("chan2soc");
             SocketStreamCopyMonitor.monitor(5, TimeUnit.SECONDS, soc2chan, chan2soc, this, socket);
@@ -102,16 +102,19 @@ public class LocalPortForwarder {
 
     }
 
-    private final Logger log = LoggerFactory.getLogger(LocalPortForwarder.class);
-
+    private final LoggerFactory loggerFactory;
+    private final Logger log;
     private final Connection conn;
     private final Parameters parameters;
     private final ServerSocket serverSocket;
+    private Thread runningThread;
 
-    public LocalPortForwarder(Connection conn, Parameters parameters, ServerSocket serverSocket) {
+    public LocalPortForwarder(Connection conn, Parameters parameters, ServerSocket serverSocket, LoggerFactory loggerFactory) {
         this.conn = conn;
         this.parameters = parameters;
         this.serverSocket = serverSocket;
+        this.loggerFactory = loggerFactory;
+        this.log = loggerFactory.getLogger(getClass());
     }
 
     private void startChannel(Socket socket) throws IOException {
@@ -130,15 +133,48 @@ public class LocalPortForwarder {
      *
      * @throws IOException
      */
-    public void listen()
-            throws IOException {
-        log.info("Listening on {}", serverSocket.getLocalSocketAddress());
-        while (!Thread.currentThread().isInterrupted()) {
-            final Socket socket = serverSocket.accept();
-            log.debug("Got connection from {}", socket.getRemoteSocketAddress());
-            startChannel(socket);
-        }
-        log.debug("Interrupted!");
+    public void listen() throws IOException {
+        listen(Thread.currentThread());
     }
 
-}
+    /**
+     * Start listening for incoming connections and forward to remote host as a channel and ensure that the thread is registered.
+     * This is useful if for instance {@link #close() is called from another thread}
+     *
+     * @throws IOException
+     */
+    public void listen(Thread runningThread) throws IOException {
+        this.runningThread = runningThread;
+        log.info("Listening on {}", serverSocket.getLocalSocketAddress());
+        while (!runningThread.isInterrupted()) {
+            try {
+                final Socket socket = serverSocket.accept();
+                log.debug("Got connection from {}", socket.getRemoteSocketAddress());
+                startChannel(socket);
+            } catch (SocketException e) {
+                if (!serverSocket.isClosed()) {
+                    throw e;
+                }
+            }
+        }
+        if (serverSocket.isClosed()) {
+            log.debug("LocalPortForwarder closed");
+        } else {
+            log.debug("LocalPortForwarder interrupted!");
+        }
+    }
+
+    /**
+     * Close the ServerSocket that's listening for connections to forward.
+     *
+     * @throws IOException
+     */
+    public void close() throws IOException {
+        if (!serverSocket.isClosed()) {
+            log.info("Closing listener on {}", serverSocket.getLocalSocketAddress());
+            serverSocket.close();
+            runningThread.interrupt();
+        }
+    }
+
+}

src/main/java/net/schmizz/sshj/connection/channel/direct/SessionChannel.java

@@ -15,18 +15,14 @@
  */
 package net.schmizz.sshj.connection.channel.direct;
 
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.IOUtils;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
-import net.schmizz.sshj.common.SSHRuntimeException;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.connection.Connection;
 import net.schmizz.sshj.connection.ConnectionException;
 import net.schmizz.sshj.connection.channel.ChannelInputStream;
 import net.schmizz.sshj.transport.TransportException;
 
 import java.io.InputStream;
+import java.nio.charset.Charset;
 import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
@@ -52,6 +48,10 @@ public class SessionChannel
         super(conn, "session");
     }
 
+    public SessionChannel(Connection conn, Charset remoteCharset) {
+        super(conn, "session", remoteCharset);
+    }
+
     @Override
     public void allocateDefaultPTY()
             throws ConnectionException, TransportException {
@@ -98,7 +98,7 @@ public class SessionChannel
             throws ConnectionException, TransportException {
         checkReuse();
         log.debug("Will request to exec `{}`", command);
-        sendChannelRequest("exec", true, new Buffer.PlainBuffer().putString(command))
+        sendChannelRequest("exec", true, new Buffer.PlainBuffer().putString(command, getRemoteCharset()))
                 .await(conn.getTimeoutMs(), TimeUnit.MILLISECONDS);
         usedUp = true;
         return this;

src/main/java/net/schmizz/sshj/connection/channel/forwarded/AbstractForwardedChannel.java

@@ -73,4 +73,4 @@ public abstract class AbstractForwardedChannel
         return origPort;
     }
 
-}
+}

src/main/java/net/schmizz/sshj/connection/channel/forwarded/AbstractForwardedChannelOpener.java

@@ -21,7 +21,6 @@ import net.schmizz.sshj.connection.channel.Channel;
 import net.schmizz.sshj.connection.channel.OpenFailException;
 import net.schmizz.sshj.transport.TransportException;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 
@@ -29,14 +28,14 @@ import java.io.IOException;
 public abstract class AbstractForwardedChannelOpener
         implements ForwardedChannelOpener {
 
-    protected final Logger log = LoggerFactory.getLogger(getClass());
-
+    protected final Logger log;
     protected final String chanType;
     protected final Connection conn;
 
     protected AbstractForwardedChannelOpener(String chanType, Connection conn) {
         this.chanType = chanType;
         this.conn = conn;
+        log = conn.getTransport().getConfig().getLoggerFactory().getLogger(getClass());
     }
 
     @Override
@@ -72,4 +71,4 @@ public abstract class AbstractForwardedChannelOpener
         }.start();
     }
 
-}
+}

src/main/java/net/schmizz/sshj/connection/channel/forwarded/RemotePortForwarder.java

@@ -130,7 +130,7 @@ public class RemotePortForwarder
                 // Addresses match up
                 return true;
             }
-            if ("localhost".equals(address) && (channelForward.address.equals("127.0.0.1") || channelForward.address.equals("::1"))) {
+            if ("localhost".equals(address) && ("127.0.0.1".equals(channelForward.address) || "::1".equals(channelForward.address))) {
                 // Localhost special case.
                 return true;
             }

src/main/java/net/schmizz/sshj/connection/channel/forwarded/SocketForwardingConnectListener.java

@@ -19,8 +19,6 @@ import net.schmizz.concurrent.Event;
 import net.schmizz.sshj.common.StreamCopier;
 import net.schmizz.sshj.connection.channel.Channel;
 import net.schmizz.sshj.connection.channel.SocketStreamCopyMonitor;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.Socket;
@@ -31,8 +29,6 @@ import java.util.concurrent.TimeUnit;
 public class SocketForwardingConnectListener
         implements ConnectListener {
 
-    protected final Logger log = LoggerFactory.getLogger(getClass());
-
     protected final SocketAddress addr;
 
     /** Create with a {@link SocketAddress} this listener will forward to. */
@@ -44,7 +40,7 @@ public class SocketForwardingConnectListener
     @Override
     public void gotConnect(Channel.Forwarded chan)
             throws IOException {
-        log.debug("New connection from {}:{}", chan.getOriginatorIP(), chan.getOriginatorPort());
+        chan.getLoggerFactory().getLogger(getClass()).debug("New connection from {}:{}", chan.getOriginatorIP(), chan.getOriginatorPort());
 
         final Socket sock = new Socket();
         sock.setSendBufferSize(chan.getLocalMaxPacketSize());
@@ -55,11 +51,11 @@ public class SocketForwardingConnectListener
         // ok so far -- could connect, let's confirm the channel
         chan.confirm();
 
-        final Event<IOException> soc2chan = new StreamCopier(sock.getInputStream(), chan.getOutputStream())
+        final Event<IOException> soc2chan = new StreamCopier(sock.getInputStream(), chan.getOutputStream(), chan.getLoggerFactory())
                 .bufSize(chan.getRemoteMaxPacketSize())
                 .spawnDaemon("soc2chan");
 
-        final Event<IOException> chan2soc = new StreamCopier(chan.getInputStream(), sock.getOutputStream())
+        final Event<IOException> chan2soc = new StreamCopier(chan.getInputStream(), sock.getOutputStream(), chan.getLoggerFactory())
                 .bufSize(chan.getLocalMaxPacketSize())
                 .spawnDaemon("chan2soc");
 

src/main/java/net/schmizz/sshj/sftp/FileAttributes.java

@@ -222,7 +222,7 @@ public final class FileAttributes {
             sb.append("size=").append(size).append(";");
 
         if (has(Flag.UIDGID))
-            sb.append("uid=").append(size).append(",gid=").append(gid).append(";");
+            sb.append("uid=").append(uid).append(",gid=").append(gid).append(";");
 
         if (has(Flag.MODE))
             sb.append("mode=").append(mode.toString()).append(";");

src/main/java/net/schmizz/sshj/sftp/FileMode.java

@@ -36,7 +36,7 @@ public class FileMode {
         /** directory */
         DIRECTORY(0040000),
         /** symbolic link */
-        SYMKLINK(0120000),
+        SYMLINK(0120000),
         /** unknown */
         UNKNOWN(0);
 

src/main/java/net/schmizz/sshj/sftp/PacketReader.java

@@ -17,20 +17,19 @@ package net.schmizz.sshj.sftp;
 
 import net.schmizz.concurrent.Promise;
 import net.schmizz.sshj.common.SSHException;
-
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
-public class PacketReader
-        extends Thread {
+public class PacketReader extends Thread {
 
-    /** Logger */
-    private final Logger log = LoggerFactory.getLogger(getClass());
+    /**
+     * Logger
+     */
+    private final Logger log;
 
     private final InputStream in;
     private final Map<Long, Promise<Response, SFTPException>> promises = new ConcurrentHashMap<Long, Promise<Response, SFTPException>>();
@@ -40,6 +39,7 @@ public class PacketReader
 
     public PacketReader(SFTPEngine engine) {
         this.engine = engine;
+        log = engine.getLoggerFactory().getLogger(getClass());
         this.in = engine.getSubsystem().getInputStream();
         setName("sftp reader");
     }
@@ -64,7 +64,7 @@ public class PacketReader
                 | lenBuf[3] & 0x000000ffL);
 
         if (len > SFTPPacket.MAX_SIZE) {
-        	throw new SSHException(String.format("Indicated packet length %d too large", len));
+            throw new SSHException(String.format("Indicated packet length %d too large", len));
         }
 
         return (int) len;
@@ -100,14 +100,14 @@ public class PacketReader
         log.debug("Received {} packet", resp.getType());
         if (promise == null)
             throw new SFTPException("Received [" + resp.readType() + "] response for request-id " + resp.getRequestID()
-                                            + ", no such request was made");
+                    + ", no such request was made");
         else
             promise.deliver(resp);
     }
 
     public Promise<Response, SFTPException> expectResponseTo(long requestId) {
         final Promise<Response, SFTPException> promise
-                = new Promise<Response, SFTPException>("sftp / " + requestId, SFTPException.chainer);
+                = new Promise<Response, SFTPException>("sftp / " + requestId, SFTPException.chainer, engine.getLoggerFactory());
         promises.put(requestId, promise);
         return promise;
     }

src/main/java/net/schmizz/sshj/sftp/PathHelper.java

@@ -73,7 +73,7 @@ public class PathHelper {
         if (path.equals(pathSep))
             return getComponents("", "");
 
-        if (path.isEmpty() || path.equals(".") || path.equals("." + pathSep))
+        if (path.isEmpty() || ".".equals(path) || ("." + pathSep).equals(path))
             return getComponents(getDotDir());
 
         final String withoutTrailSep = trimTrailingSeparator(path);
@@ -81,7 +81,7 @@ public class PathHelper {
         final String parent = (lastSep == -1) ? "" : withoutTrailSep.substring(0, lastSep);
         final String name = (lastSep == -1) ? withoutTrailSep : withoutTrailSep.substring(lastSep + pathSep.length());
 
-        if (name.equals(".") || name.equals("..")) {
+        if (".".equals(name) || "..".equals(name)) {
             return getComponents(canonicalizer.canonicalize(path));
         } else {
             return getComponents(parent, name);

src/main/java/net/schmizz/sshj/sftp/RandomAccessRemoteFile.java

@@ -15,12 +15,7 @@
  */
 package net.schmizz.sshj.sftp;
 
-import java.io.DataInput;
-import java.io.DataInputStream;
-import java.io.DataOutput;
-import java.io.DataOutputStream;
-import java.io.EOFException;
-import java.io.IOException;
+import java.io.*;
 
 public class RandomAccessRemoteFile
         implements DataInput, DataOutput {

src/main/java/net/schmizz/sshj/sftp/RemoteDirectory.java

@@ -25,13 +25,14 @@ import java.util.concurrent.TimeUnit;
 public class RemoteDirectory
         extends RemoteResource {
 
-    public RemoteDirectory(Requester requester, String path, byte[] handle) {
+    public RemoteDirectory(SFTPEngine requester, String path, byte[] handle) {
         super(requester, path, handle);
     }
 
     public List<RemoteResourceInfo> scan(RemoteResourceFilter filter)
             throws IOException {
         List<RemoteResourceInfo> rri = new LinkedList<RemoteResourceInfo>();
+        // TODO: Remove GOTO! 
         loop:
         for (; ; ) {
             final Response res = requester.request(newRequest(PacketType.READDIR))
@@ -41,13 +42,14 @@ public class RemoteDirectory
                 case NAME:
                     final int count = res.readUInt32AsInt();
                     for (int i = 0; i < count; i++) {
-                        final String name = res.readString();
+                        final String name = res.readString(requester.sub.getRemoteCharset());
                         res.readString(); // long name - IGNORED - shdve never been in the protocol
                         final FileAttributes attrs = res.readFileAttributes();
                         final PathComponents comps = requester.getPathHelper().getComponents(path, name);
                         final RemoteResourceInfo inf = new RemoteResourceInfo(comps, attrs);
-                        if (!(name.equals(".") || name.equals("..")) && (filter == null || filter.accept(inf)))
+                        if (!(".".equals(name) || "..".equals(name)) && (filter == null || filter.accept(inf))) {
                             rri.add(inf);
+                        }
                     }
                     break;
 

src/main/java/net/schmizz/sshj/sftp/RemoteFile.java

@@ -30,7 +30,7 @@ import java.util.concurrent.TimeUnit;
 public class RemoteFile
         extends RemoteResource {
 
-    public RemoteFile(Requester requester, String path, byte[] handle) {
+    public RemoteFile(SFTPEngine requester, String path, byte[] handle) {
         super(requester, path, handle);
     }
 
@@ -81,10 +81,10 @@ public class RemoteFile
     protected Promise<Response, SFTPException> asyncWrite(long fileOffset, byte[] data, int off, int len)
             throws IOException {
         return requester.request(newRequest(PacketType.WRITE)
-                        .putUInt64(fileOffset)
-                        // TODO The SFTP spec claims this field is unneeded...? See #187
-                        .putUInt32(len)
-                        .putRawBytes(data, off, len)
+                .putUInt64(fileOffset)
+                // TODO The SFTP spec claims this field is unneeded...? See #187
+                .putUInt32(len)
+                .putRawBytes(data, off, len)
         );
     }
 
@@ -194,10 +194,10 @@ public class RemoteFile
 
         @Override
         public long skip(long n) throws IOException {
-			final long fileLength = length();
-			final Long previousFileOffset = fileOffset;
-			fileOffset = Math.min(fileOffset + n, fileLength);
-			return fileOffset - previousFileOffset;
+            final long fileLength = length();
+            final Long previousFileOffset = fileOffset;
+            fileOffset = Math.min(fileOffset + n, fileLength);
+            return fileOffset - previousFileOffset;
         }
 
         @Override
@@ -341,7 +341,7 @@ public class RemoteFile
         public int available() throws IOException {
             boolean lastRead = true;
             while (!eof && (pending.available() <= 0) && lastRead) {
-              lastRead = retrieveUnconfirmedRead(false /*blocking*/);
+                lastRead = retrieveUnconfirmedRead(false /*blocking*/);
             }
             return pending.available();
         }

src/main/java/net/schmizz/sshj/sftp/RemoteResource.java

@@ -16,7 +16,6 @@
 package net.schmizz.sshj.sftp;
 
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
@@ -26,14 +25,15 @@ public abstract class RemoteResource
         implements Closeable {
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final Logger log;
 
-    protected final Requester requester;
+    protected final SFTPEngine requester;
     protected final String path;
     protected final byte[] handle;
 
-    protected RemoteResource(Requester requester, String path, byte[] handle) {
+    protected RemoteResource(SFTPEngine requester, String path, byte[] handle) {
         this.requester = requester;
+        log = requester.getLoggerFactory().getLogger(getClass());
         this.path = path;
         this.handle = handle;
     }

src/main/java/net/schmizz/sshj/sftp/Response.java

@@ -20,7 +20,7 @@ import net.schmizz.sshj.common.Buffer;
 public final class Response
         extends SFTPPacket<Response> {
 
-    public static enum StatusCode {
+    public enum StatusCode {
         UNKNOWN(-1),
         OK(0),
         EOF(1),
@@ -30,7 +30,30 @@ public final class Response
         BAD_MESSAGE(5),
         NO_CONNECTION(6),
         CONNECITON_LOST(7),
-        OP_UNSUPPORTED(8);
+        OP_UNSUPPORTED(8),
+        INVALID_HANDLE(9),
+        NO_SUCH_PATH(10),
+        FILE_ALREADY_EXISTS(11),
+        WRITE_PROTECT(12),
+        NO_MEDIA(13),
+        NO_SPACE_ON_FILESYSTEM(14),
+        QUOTA_EXCEEDED(15),
+        UNKNOWN_PRINCIPAL(16),
+        LOCK_CONFLICT(17),
+        DIR_NOT_EMPTY(18),
+        NOT_A_DIRECTORY(19),
+        INVALID_FILENAME(20),
+        LINK_LOOP(21),
+        CANNOT_DELETE(22),
+        INVALID_PARAMETER(23),
+        FILE_IS_A_DIRECTORY(24),
+        BYTE_RANGE_LOCK_CONFLICT(25),
+        BYTE_RANGE_LOCK_REFUSED(26),
+        DELETE_PENDING(27),
+        FILE_CORRUPT(28),
+        OWNER_INVALID(29),
+        GROUP_INVALID(30),
+        NO_MATCHING_BYTE_RANGE_LOCK(31);
 
         private final int code;
 
@@ -99,6 +122,7 @@ public final class Response
         return ensurePacketTypeIs(PacketType.STATUS).ensureStatusIs(StatusCode.OK);
     }
 
+    @SuppressWarnings("PMD.CompareObjectsWithEquals")
     public Response ensureStatusIs(StatusCode acceptable)
             throws SFTPException {
         final StatusCode sc = readStatusCode();

src/main/java/net/schmizz/sshj/sftp/SFTPClient.java

@@ -19,27 +19,23 @@ import net.schmizz.sshj.xfer.FilePermission;
 import net.schmizz.sshj.xfer.LocalDestFile;
 import net.schmizz.sshj.xfer.LocalSourceFile;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
-import java.util.Deque;
-import java.util.EnumSet;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
 
 public class SFTPClient
         implements Closeable {
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final Logger log;
 
     protected final SFTPEngine engine;
     protected final SFTPFileTransfer xfer;
 
     public SFTPClient(SFTPEngine engine) {
         this.engine = engine;
+        log = engine.getLoggerFactory().getLogger(getClass());
         this.xfer = new SFTPFileTransfer(engine);
     }
 
@@ -89,7 +85,7 @@ public class SFTPClient
 
     public void mkdirs(String path)
             throws IOException {
-        final Deque<String> dirsToMake = new LinkedList<>();
+        final Deque<String> dirsToMake = new LinkedList<String>();
         for (PathComponents current = engine.getPathHelper().getComponents(path); ;
              current = engine.getPathHelper().getComponents(current.getParent())) {
             final FileAttributes attrs = statExistence(current.getPath());

src/main/java/net/schmizz/sshj/sftp/SFTPEngine.java

@@ -16,15 +16,17 @@
 package net.schmizz.sshj.sftp;
 
 import net.schmizz.concurrent.Promise;
+import net.schmizz.sshj.common.IOUtils;
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.connection.channel.direct.Session.Subsystem;
+import net.schmizz.sshj.connection.channel.direct.Session;
 import net.schmizz.sshj.connection.channel.direct.SessionFactory;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.nio.charset.Charset;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Map;
@@ -38,13 +40,14 @@ public class SFTPEngine
     public static final int DEFAULT_TIMEOUT_MS = 30 * 1000; // way too long, but it was the original default
 
     /** Logger */
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final LoggerFactory loggerFactory;
+    protected final Logger log;
 
     protected volatile int timeoutMs = DEFAULT_TIMEOUT_MS;
 
     protected final PathHelper pathHelper;
 
-    protected final Subsystem sub;
+    protected final Session.Subsystem sub;
     protected final PacketReader reader;
     protected final OutputStream out;
 
@@ -59,7 +62,10 @@ public class SFTPEngine
 
     public SFTPEngine(SessionFactory ssh, String pathSep)
             throws SSHException {
-        sub = ssh.startSession().startSubsystem("sftp");
+        Session session = ssh.startSession();
+        loggerFactory = session.getLoggerFactory();
+        log = loggerFactory.getLogger(getClass());
+        sub = session.startSubsystem("sftp");
         out = sub.getOutputStream();
         reader = new PacketReader(this);
         pathHelper = new PathHelper(new PathHelper.Canonicalizer() {
@@ -94,7 +100,7 @@ public class SFTPEngine
         return this;
     }
 
-    public Subsystem getSubsystem() {
+    public Session.Subsystem getSubsystem() {
         return sub;
     }
 
@@ -133,7 +139,7 @@ public class SFTPEngine
     public RemoteFile open(String path, Set<OpenMode> modes, FileAttributes fa)
             throws IOException {
         final byte[] handle = doRequest(
-                newRequest(PacketType.OPEN).putString(path).putUInt32(OpenMode.toMask(modes)).putFileAttributes(fa)
+                newRequest(PacketType.OPEN).putString(path, sub.getRemoteCharset()).putUInt32(OpenMode.toMask(modes)).putFileAttributes(fa)
         ).ensurePacketTypeIs(PacketType.HANDLE).readBytes();
         return new RemoteFile(this, path, handle);
     }
@@ -151,7 +157,7 @@ public class SFTPEngine
     public RemoteDirectory openDir(String path)
             throws IOException {
         final byte[] handle = doRequest(
-                newRequest(PacketType.OPENDIR).putString(path)
+                newRequest(PacketType.OPENDIR).putString(path, sub.getRemoteCharset())
         ).ensurePacketTypeIs(PacketType.HANDLE).readBytes();
         return new RemoteDirectory(this, path, handle);
     }
@@ -159,7 +165,7 @@ public class SFTPEngine
     public void setAttributes(String path, FileAttributes attrs)
             throws IOException {
         doRequest(
-                newRequest(PacketType.SETSTAT).putString(path).putFileAttributes(attrs)
+                newRequest(PacketType.SETSTAT).putString(path, sub.getRemoteCharset()).putFileAttributes(attrs)
         ).ensureStatusPacketIsOK();
     }
 
@@ -169,13 +175,13 @@ public class SFTPEngine
             throw new SFTPException("READLINK is not supported in SFTPv" + operativeVersion);
         return readSingleName(
                 doRequest(
-                        newRequest(PacketType.READLINK).putString(path)
-                ));
+                        newRequest(PacketType.READLINK).putString(path, sub.getRemoteCharset())
+                ), sub.getRemoteCharset());
     }
 
     public void makeDir(String path, FileAttributes attrs)
             throws IOException {
-        doRequest(newRequest(PacketType.MKDIR).putString(path).putFileAttributes(attrs)).ensureStatusPacketIsOK();
+        doRequest(newRequest(PacketType.MKDIR).putString(path, sub.getRemoteCharset()).putFileAttributes(attrs)).ensureStatusPacketIsOK();
     }
 
     public void makeDir(String path)
@@ -188,21 +194,21 @@ public class SFTPEngine
         if (operativeVersion < 3)
             throw new SFTPException("SYMLINK is not supported in SFTPv" + operativeVersion);
         doRequest(
-                newRequest(PacketType.SYMLINK).putString(linkpath).putString(targetpath)
+                newRequest(PacketType.SYMLINK).putString(linkpath, sub.getRemoteCharset()).putString(targetpath, sub.getRemoteCharset())
         ).ensureStatusPacketIsOK();
     }
 
     public void remove(String filename)
             throws IOException {
         doRequest(
-                newRequest(PacketType.REMOVE).putString(filename)
+                newRequest(PacketType.REMOVE).putString(filename, sub.getRemoteCharset())
         ).ensureStatusPacketIsOK();
     }
 
     public void removeDir(String path)
             throws IOException {
         doRequest(
-                newRequest(PacketType.RMDIR).putString(path)
+                newRequest(PacketType.RMDIR).putString(path, sub.getRemoteCharset())
         ).ensureStatusIs(Response.StatusCode.OK);
     }
 
@@ -221,7 +227,7 @@ public class SFTPEngine
         if (operativeVersion < 1)
             throw new SFTPException("RENAME is not supported in SFTPv" + operativeVersion);
         doRequest(
-                newRequest(PacketType.RENAME).putString(oldPath).putString(newPath)
+                newRequest(PacketType.RENAME).putString(oldPath, sub.getRemoteCharset()).putString(newPath, sub.getRemoteCharset())
         ).ensureStatusPacketIsOK();
     }
 
@@ -229,8 +235,8 @@ public class SFTPEngine
             throws IOException {
         return readSingleName(
                 doRequest(
-                        newRequest(PacketType.REALPATH).putString(path)
-                ));
+                        newRequest(PacketType.REALPATH).putString(path, sub.getRemoteCharset())
+                ), sub.getRemoteCharset());
     }
 
     public void setTimeoutMs(int timeoutMs) {
@@ -248,22 +254,38 @@ public class SFTPEngine
         reader.interrupt();
     }
 
+    protected LoggerFactory getLoggerFactory() {
+	return loggerFactory;
+    }
+
     protected FileAttributes stat(PacketType pt, String path)
             throws IOException {
-        return doRequest(newRequest(pt).putString(path))
+        return doRequest(newRequest(pt).putString(path, sub.getRemoteCharset()))
                 .ensurePacketTypeIs(PacketType.ATTRS)
                 .readFileAttributes();
     }
 
-    protected static String readSingleName(Response res)
+    private static byte[] readSingleNameAsBytes(Response res)
             throws IOException {
         res.ensurePacketTypeIs(PacketType.NAME);
         if (res.readUInt32AsInt() == 1)
-            return res.readString();
+            return res.readStringAsBytes();
         else
             throw new SFTPException("Unexpected data in " + res.getType() + " packet");
     }
 
+    /** Using UTF-8 */
+    protected static String readSingleName(Response res)
+        throws IOException {
+        return readSingleName(res, IOUtils.UTF8);
+    }
+
+    /** Using any character set */
+    protected static String readSingleName(Response res, Charset charset)
+        throws IOException {
+        return new String(readSingleNameAsBytes(res), charset);
+    }
+
     protected synchronized void transmit(SFTPPacket<Request> payload)
             throws IOException {
         final int len = payload.available();

src/main/java/net/schmizz/sshj/sftp/SFTPFileTransfer.java

@@ -17,13 +17,7 @@ package net.schmizz.sshj.sftp;
 
 import net.schmizz.sshj.common.StreamCopier;
 import net.schmizz.sshj.sftp.Response.StatusCode;
-import net.schmizz.sshj.xfer.AbstractFileTransfer;
-import net.schmizz.sshj.xfer.FileSystemFile;
-import net.schmizz.sshj.xfer.FileTransfer;
-import net.schmizz.sshj.xfer.LocalDestFile;
-import net.schmizz.sshj.xfer.LocalFileFilter;
-import net.schmizz.sshj.xfer.LocalSourceFile;
-import net.schmizz.sshj.xfer.TransferListener;
+import net.schmizz.sshj.xfer.*;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -41,6 +35,7 @@ public class SFTPFileTransfer
     private volatile boolean preserveAttributes = true;
 
     public SFTPFileTransfer(SFTPEngine engine) {
+	super(engine.getLoggerFactory());
         this.engine = engine;
     }
 
@@ -65,14 +60,12 @@ public class SFTPFileTransfer
     }
 
     @Override
-    public void upload(LocalSourceFile localFile, String remotePath)
-            throws IOException {
-        new Uploader().upload(getTransferListener(), localFile, remotePath);
+    public void upload(LocalSourceFile localFile, String remotePath) throws IOException {
+        new Uploader(localFile, remotePath).upload(getTransferListener());
     }
 
     @Override
-    public void download(String source, LocalDestFile dest)
-            throws IOException {
+    public void download(String source, LocalDestFile dest) throws IOException {
         final PathComponents pathComponents = engine.getPathHelper().getComponents(source);
         final FileAttributes attributes = engine.stat(source);
         new Downloader().download(getTransferListener(), new RemoteResourceInfo(pathComponents, attributes), dest);
@@ -96,10 +89,10 @@ public class SFTPFileTransfer
 
     private class Downloader {
 
+        @SuppressWarnings("PMD.MissingBreakInSwitch")
         private void download(final TransferListener listener,
                               final RemoteResourceInfo remote,
-                              final LocalDestFile local)
-                throws IOException {
+                              final LocalDestFile local) throws IOException {
             final LocalDestFile adjustedFile;
             switch (remote.getAttributes().getType()) {
                 case DIRECTORY:
@@ -109,8 +102,7 @@ public class SFTPFileTransfer
                     log.warn("Server did not supply information about the type of file at `{}` " +
                                      "-- assuming it is a regular file!", remote.getPath());
                 case REGULAR:
-                    adjustedFile = downloadFile(listener.file(remote.getName(), remote.getAttributes().getSize()),
-                                                remote, local);
+                    adjustedFile = downloadFile(listener.file(remote.getName(), remote.getAttributes().getSize()), remote, local);
                     break;
                 default:
                     throw new IOException(remote + " is not a regular file or directory");
@@ -144,7 +136,7 @@ public class SFTPFileTransfer
                 final RemoteFile.ReadAheadRemoteFileInputStream rfis = rf.new ReadAheadRemoteFileInputStream(16);
                 final OutputStream os = adjusted.getOutputStream();
                 try {
-                    new StreamCopier(rfis, os)
+                    new StreamCopier(rfis, os, engine.getLoggerFactory())
                             .bufSize(engine.getSubsystem().getLocalMaxPacketSize())
                             .keepFlushing(false)
                             .listener(listener)
@@ -173,6 +165,31 @@ public class SFTPFileTransfer
 
     private class Uploader {
 
+        private final LocalSourceFile source;
+        private final String remote;
+
+        private Uploader(final LocalSourceFile source, final String remote) {
+            this.source = source;
+            this.remote = remote;
+        }
+
+        private void upload(final TransferListener listener) throws IOException {
+            if (source.isDirectory()) {
+                makeDirIfNotExists(remote); // Ensure that the directory exists
+                uploadDir(listener.directory(source.getName()), source, remote);
+                setAttributes(source, remote);
+            } else if (source.isFile() && isDirectory(remote)) {
+                String adjustedRemote = engine.getPathHelper().adjustForParent(this.remote, source.getName());
+                uploadFile(listener.file(source.getName(), source.getLength()), source, adjustedRemote);
+                setAttributes(source, adjustedRemote);
+            } else if (source.isFile()) {
+                uploadFile(listener.file(source.getName(), source.getLength()), source, remote);
+                setAttributes(source, remote);
+            } else {
+                throw new IOException(source + " is not a file or directory");
+            }
+        }
+
         private void upload(final TransferListener listener,
                             final LocalSourceFile local,
                             final String remote)
@@ -182,20 +199,26 @@ public class SFTPFileTransfer
                 adjustedPath = uploadDir(listener.directory(local.getName()), local, remote);
             } else if (local.isFile()) {
                 adjustedPath = uploadFile(listener.file(local.getName(), local.getLength()), local, remote);
-            } else
+            } else {
                 throw new IOException(local + " is not a file or directory");
-            if (getPreserveAttributes())
-                engine.setAttributes(adjustedPath, getAttributes(local));
+            }
+            setAttributes(local, adjustedPath);
+        }
+
+        private void setAttributes(LocalSourceFile local, String remotePath) throws IOException {
+            if (getPreserveAttributes()) {
+                engine.setAttributes(remotePath, getAttributes(local));
+            }
         }
 
         private String uploadDir(final TransferListener listener,
                                  final LocalSourceFile local,
                                  final String remote)
                 throws IOException {
-            final String adjusted = prepareDir(local, remote);
+            makeDirIfNotExists(remote);
             for (LocalSourceFile f : local.getChildren(getUploadFilter()))
-                upload(listener, f, adjusted);
-            return adjusted;
+                upload(listener, f, engine.getPathHelper().adjustForParent(remote, f.getName()));
+            return remote;
         }
 
         private String uploadFile(final StreamCopier.Listener listener,
@@ -203,52 +226,72 @@ public class SFTPFileTransfer
                                   final String remote)
                 throws IOException {
             final String adjusted = prepareFile(local, remote);
-            final RemoteFile rf = engine.open(adjusted, EnumSet.of(OpenMode.WRITE,
-                                                                   OpenMode.CREAT,
-                                                                   OpenMode.TRUNC));
+            RemoteFile rf = null;
+            InputStream fis = null;
+            RemoteFile.RemoteFileOutputStream rfos = null;
             try {
-                final InputStream fis = local.getInputStream();
-                final RemoteFile.RemoteFileOutputStream rfos = rf.new RemoteFileOutputStream(0, 16);
-                try {
-                    new StreamCopier(fis, rfos)
-                            .bufSize(engine.getSubsystem().getRemoteMaxPacketSize() - rf.getOutgoingPacketOverhead())
-                            .keepFlushing(false)
-                            .listener(listener)
-                            .copy();
-                } finally {
-                    fis.close();
-                    rfos.close();
-                }
+                rf = engine.open(adjusted, EnumSet.of(OpenMode.WRITE, OpenMode.CREAT, OpenMode.TRUNC));
+                fis = local.getInputStream();
+                rfos = rf.new RemoteFileOutputStream(0, 16);
+                new StreamCopier(fis, rfos, engine.getLoggerFactory())
+                        .bufSize(engine.getSubsystem().getRemoteMaxPacketSize() - rf.getOutgoingPacketOverhead())
+                        .keepFlushing(false)
+                        .listener(listener)
+                        .copy();
             } finally {
-                rf.close();
+                if (rf != null) {
+                    try {
+                        rf.close();
+                    } catch (IOException e) {
+                    }
+                }
+                if (fis != null) {
+                    try {
+                        fis.close();
+                    } catch (IOException e) {
+                    }
+                }
+                if (rfos != null) {
+                    try {
+                        rfos.close();
+                    } catch (IOException e) {
+                    }
+                }
             }
             return adjusted;
         }
 
-        private String prepareDir(final LocalSourceFile local, final String remote)
-                throws IOException {
-            final FileAttributes attrs;
+        private boolean makeDirIfNotExists(final String remote) throws IOException {
             try {
-                attrs = engine.stat(remote);
+                FileAttributes attrs = engine.stat(remote);
+                if (attrs.getMode().getType() != FileMode.Type.DIRECTORY) {
+                    throw new IOException(remote + " exists and should be a directory, but was a " + attrs.getMode().getType());
+                }
+                // Was not created, but existed.
+                return false;
             } catch (SFTPException e) {
                 if (e.getStatusCode() == StatusCode.NO_SUCH_FILE) {
-                    log.debug("probeDir: {} does not exist, creating", remote);
+                    log.debug("makeDir: {} does not exist, creating", remote);
                     engine.makeDir(remote);
-                    return remote;
-                } else
-                    throw e;
-            }
-
-            if (attrs.getMode().getType() == FileMode.Type.DIRECTORY)
-                if (engine.getPathHelper().getComponents(remote).getName().equals(local.getName())) {
-                    log.debug("probeDir: {} already exists", remote);
-                    return remote;
+                    return true;
                 } else {
-                    log.debug("probeDir: {} already exists, path adjusted for {}", remote, local.getName());
-                    return prepareDir(local, engine.getPathHelper().adjustForParent(remote, local.getName()));
+                    throw e;
                 }
-            else
-                throw new IOException(attrs.getMode().getType() + " file already exists at " + remote);
+            }
+        }
+
+        private boolean isDirectory(final String remote) throws IOException {
+            try {
+                FileAttributes attrs = engine.stat(remote);
+                return attrs.getMode().getType() == FileMode.Type.DIRECTORY;
+            } catch (SFTPException e) {
+                if (e.getStatusCode() == StatusCode.NO_SUCH_FILE) {
+                    log.debug("isDir: {} does not exist", remote);
+                    return false;
+                } else {
+                    throw e;
+                }
+            }
         }
 
         private String prepareFile(final LocalSourceFile local, final String remote)
@@ -264,8 +307,7 @@ public class SFTPFileTransfer
                     throw e;
             }
             if (attrs.getMode().getType() == FileMode.Type.DIRECTORY) {
-                log.debug("probeFile: {} was directory, path adjusted for {}", remote, local.getName());
-                return engine.getPathHelper().adjustForParent(remote, local.getName());
+                throw new IOException("Trying to upload file " + local.getName() + " to path " + remote + " but that is a directory");
             } else {
                 log.debug("probeFile: {} is a {} file that will be replaced", remote, attrs.getMode().getType());
                 return remote;
@@ -281,5 +323,4 @@ public class SFTPFileTransfer
         }
 
     }
-
 }

src/main/java/net/schmizz/sshj/signature/AbstractSignature.java

@@ -84,7 +84,7 @@ public abstract class AbstractSignature
                     | sig[i++] & 0x000000ff;
             byte[] newSig = new byte[j];
             System.arraycopy(sig, i, newSig, 0, j);
-            sig = newSig;
+            return newSig;
         }
         return sig;
     }

src/main/java/net/schmizz/sshj/signature/SignatureDSA.java

@@ -15,11 +15,11 @@
  */
 package net.schmizz.sshj.signature;
 
-import java.security.SignatureException;
-
 import net.schmizz.sshj.common.KeyType;
 import net.schmizz.sshj.common.SSHRuntimeException;
 
+import java.security.SignatureException;
+
 /** DSA {@link Signature} */
 public class SignatureDSA
         extends AbstractSignature {

src/main/java/net/schmizz/sshj/signature/SignatureECDSA.java

@@ -15,13 +15,13 @@
  */
 package net.schmizz.sshj.signature;
 
-import java.math.BigInteger;
-import java.security.SignatureException;
-
 import net.schmizz.sshj.common.Buffer;
 import net.schmizz.sshj.common.KeyType;
 import net.schmizz.sshj.common.SSHRuntimeException;
 
+import java.math.BigInteger;
+import java.security.SignatureException;
+
 /** ECDSA {@link Signature} */
 public class SignatureECDSA
         extends AbstractSignature {
@@ -79,7 +79,7 @@ public class SignatureECDSA
                 throw new SSHRuntimeException(String.format("Signature :: ecdsa-sha2-nistp256 expected, got %s", algo));
             }
             final int rsLen = sigbuf.readUInt32AsInt();
-            if (!(sigbuf.available() == rsLen)) {
+            if (sigbuf.available() != rsLen) {
                 throw new SSHRuntimeException("Invalid key length");
             }
             r = sigbuf.readBytes();

src/main/java/net/schmizz/sshj/signature/SignatureRSA.java

@@ -15,11 +15,11 @@
  */
 package net.schmizz.sshj.signature;
 
-import java.security.SignatureException;
-
 import net.schmizz.sshj.common.KeyType;
 import net.schmizz.sshj.common.SSHRuntimeException;
 
+import java.security.SignatureException;
+
 /** RSA {@link Signature} */
 public class SignatureRSA
         extends AbstractSignature {

src/main/java/net/schmizz/sshj/transport/Decoder.java

@@ -15,17 +15,11 @@
  */
 package net.schmizz.sshj.transport;
 
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.ByteArrayUtils;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
-import net.schmizz.sshj.common.SSHPacketHandler;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.transport.cipher.Cipher;
 import net.schmizz.sshj.transport.compression.Compression;
 import net.schmizz.sshj.transport.mac.MAC;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /** Decodes packets from the SSH binary protocol per the current algorithms. */
 final class Decoder
@@ -33,7 +27,7 @@ final class Decoder
 
     private static final int MAX_PACKET_LEN = 256 * 1024;
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
+    private final Logger log;
 
     /** What we pass decoded packets to */
     private final SSHPacketHandler packetHandler;
@@ -53,8 +47,9 @@ final class Decoder
      */
     private int needed = 8;
 
-    Decoder(SSHPacketHandler packetHandler) {
+    Decoder(Transport packetHandler) {
         this.packetHandler = packetHandler;
+        log = packetHandler.getConfig().getLoggerFactory().getLogger(getClass());
     }
 
     /**
@@ -193,4 +188,4 @@ final class Decoder
         return MAX_PACKET_LEN;
     }
 
-}
+}

src/main/java/net/schmizz/sshj/transport/Encoder.java

@@ -15,13 +15,13 @@
  */
 package net.schmizz.sshj.transport;
 
+import net.schmizz.sshj.common.LoggerFactory;
 import net.schmizz.sshj.common.SSHPacket;
 import net.schmizz.sshj.transport.cipher.Cipher;
 import net.schmizz.sshj.transport.compression.Compression;
 import net.schmizz.sshj.transport.mac.MAC;
 import net.schmizz.sshj.transport.random.Random;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.util.concurrent.locks.Lock;
 
@@ -29,28 +29,14 @@ import java.util.concurrent.locks.Lock;
 final class Encoder
         extends Converter {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
+    private final Logger log;
     private final Random prng;
-
     private final Lock encodeLock;
 
-    Encoder(Random prng, Lock encodeLock) {
+    Encoder(Random prng, Lock encodeLock, LoggerFactory loggerFactory) {
         this.prng = prng;
         this.encodeLock = encodeLock;
-    }
-
-    private SSHPacket checkHeaderSpace(SSHPacket buffer) {
-        if (buffer.rpos() < 5) {
-            log.warn("Performance cost: when sending a packet, ensure that "
-                             + "5 bytes are available in front of the buffer");
-            SSHPacket nb = new SSHPacket(buffer.available() + 5);
-            nb.rpos(5);
-            nb.wpos(5);
-            nb.putBuffer(buffer);
-            buffer = nb;
-        }
-        return buffer;
+        log = loggerFactory.getLogger(getClass());
     }
 
     private void compress(SSHPacket buffer) {
@@ -142,4 +128,4 @@ final class Encoder
         return Compression.Mode.DEFLATE;
     }
 
-}
+}

src/main/java/net/schmizz/sshj/transport/KeyExchanger.java

@@ -17,26 +17,15 @@ package net.schmizz.sshj.transport;
 
 import net.schmizz.concurrent.ErrorDeliveryUtil;
 import net.schmizz.concurrent.Event;
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.ErrorNotifiable;
-import net.schmizz.sshj.common.Factory;
-import net.schmizz.sshj.common.KeyType;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
-import net.schmizz.sshj.common.SSHPacketHandler;
-import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.transport.cipher.Cipher;
 import net.schmizz.sshj.transport.compression.Compression;
 import net.schmizz.sshj.transport.digest.Digest;
 import net.schmizz.sshj.transport.kex.KeyExchange;
 import net.schmizz.sshj.transport.mac.MAC;
-import net.schmizz.sshj.transport.verification.HostKeyVerifier;
 import net.schmizz.sshj.transport.verification.AlgorithmsVerifier;
-
+import net.schmizz.sshj.transport.verification.HostKeyVerifier;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.math.BigInteger;
 import java.security.GeneralSecurityException;
@@ -60,8 +49,7 @@ final class KeyExchanger
         NEWKEYS,
     }
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
+    private final Logger log;
     private final TransportImpl transport;
 
     /**
@@ -86,18 +74,20 @@ final class KeyExchanger
     private Proposal clientProposal;
     private NegotiatedAlgorithms negotiatedAlgs;
 
-    private final Event<TransportException> kexInitSent =
-            new Event<TransportException>("kexinit sent", TransportException.chainer);
+    private final Event<TransportException> kexInitSent;
 
     private final Event<TransportException> done;
 
     KeyExchanger(TransportImpl trans) {
         this.transport = trans;
+        log = trans.getConfig().getLoggerFactory().getLogger(getClass());
+        kexInitSent = new Event<TransportException>("kexinit sent", TransportException.chainer, trans.getConfig().getLoggerFactory());
+
         /*
          * Use TransportImpl's writeLock, since TransportImpl.write() may wait on this event and the lock should
          * be released while waiting.
          */
-        this.done = new Event<TransportException>("kex done", TransportException.chainer, trans.getWriteLock());
+        this.done = new Event<TransportException>("kex done", TransportException.chainer, trans.getWriteLock(), trans.getConfig().getLoggerFactory());
     }
 
     /**
@@ -167,6 +157,7 @@ final class KeyExchanger
                                          "Key exchange packet received when key exchange was not ongoing");
     }
 
+    @SuppressWarnings("PMD.CompareObjectsWithEquals")
     private static void ensureReceivedMatchesExpected(Message got, Message expected)
             throws TransportException {
         if (got != expected)
@@ -395,4 +386,4 @@ final class KeyExchanger
         ErrorDeliveryUtil.alertEvents(error, kexInitSent, done);
     }
 
-}
+}

src/main/java/net/schmizz/sshj/transport/Reader.java

@@ -16,7 +16,6 @@
 package net.schmizz.sshj.transport;
 
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.InputStream;
 import java.net.SocketTimeoutException;
@@ -24,12 +23,12 @@ import java.net.SocketTimeoutException;
 public final class Reader
         extends Thread {
 
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
+    private final Logger log;
     private final TransportImpl trans;
 
     public Reader(TransportImpl trans) {
         this.trans = trans;
+        log = trans.getConfig().getLoggerFactory().getLogger(getClass());
         setName("reader");
     }
 

src/main/java/net/schmizz/sshj/transport/Transport.java

@@ -235,4 +235,4 @@ public interface Transport
      * @param e The exception that occurred.
      */
     void die(Exception e);
-}
+}

src/main/java/net/schmizz/sshj/transport/TransportImpl.java

@@ -15,22 +15,17 @@
  */
 package net.schmizz.sshj.transport;
 
+import com.hierynomus.sshj.transport.IdentificationStringParser;
 import net.schmizz.concurrent.ErrorDeliveryUtil;
 import net.schmizz.concurrent.Event;
 import net.schmizz.sshj.AbstractService;
 import net.schmizz.sshj.Config;
 import net.schmizz.sshj.SSHClient;
 import net.schmizz.sshj.Service;
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.IOUtils;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.transport.verification.AlgorithmsVerifier;
 import net.schmizz.sshj.transport.verification.HostKeyVerifier;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -38,9 +33,11 @@ import java.io.OutputStream;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReentrantLock;
 
-/** A thread-safe {@link Transport} implementation. */
+/**
+ * A thread-safe {@link Transport} implementation.
+ */
 public final class TransportImpl
-        implements Transport {
+        implements Transport, DisconnectListener {
 
     private static final class NullService
             extends AbstractService {
@@ -50,14 +47,15 @@ public final class TransportImpl
         }
 
     }
+
     static final class ConnInfo {
 
         final String host;
-
         final int port;
         final InputStream in;
         final OutputStream out;
-        public ConnInfo(String host, int port, InputStream in, OutputStream out) {
+
+        ConnInfo(String host, int port, InputStream in, OutputStream out) {
             this.host = host;
             this.port = port;
             this.in = in;
@@ -65,16 +63,12 @@ public final class TransportImpl
         }
 
     }
-    private final Logger log = LoggerFactory.getLogger(getClass());
 
-    private final Service nullService = new NullService(this);
+    private final LoggerFactory loggerFactory;
 
-    private final DisconnectListener nullDisconnectListener = new DisconnectListener() {
-        @Override
-        public void notifyDisconnect(DisconnectReason reason, String message) {
-            log.info("Disconnected - {}", reason);
-        }
-    };
+    private final Logger log;
+
+    private final Service nullService;
 
     private final Config config;
 
@@ -92,36 +86,51 @@ public final class TransportImpl
 
     private final Decoder decoder;
 
-    private final Event<TransportException> serviceAccept = new Event<TransportException>("service accept", TransportException.chainer);
+    private final Event<TransportException> serviceAccept;
 
-    private final Event<TransportException> close = new Event<TransportException>("transport close", TransportException.chainer);
+    private final Event<TransportException> close;
 
-    /** Client version identification string */
+    /**
+     * Client version identification string
+     */
     private final String clientID;
 
     private volatile int timeoutMs = 30 * 1000; // Crazy long, but it was the original default
 
     private volatile boolean authed = false;
 
-    /** Currently active service e.g. UserAuthService, ConnectionService */
-    private volatile Service service = nullService;
+    /**
+     * Currently active service e.g. UserAuthService, ConnectionService
+     */
+    private volatile Service service;
 
-    private DisconnectListener disconnectListener = nullDisconnectListener;
+    private DisconnectListener disconnectListener;
 
     private ConnInfo connInfo;
 
-    /** Server version identification string */
+    /**
+     * Server version identification string
+     */
     private String serverID;
 
-    /** Message identifier of last packet received */
+    /**
+     * Message identifier of last packet received
+     */
     private Message msg;
 
     private final ReentrantLock writeLock = new ReentrantLock();
 
     public TransportImpl(Config config) {
         this.config = config;
+        this.loggerFactory = config.getLoggerFactory();
+        this.serviceAccept = new Event<TransportException>("service accept", TransportException.chainer, loggerFactory);
+        this.close = new Event<TransportException>("transport close", TransportException.chainer, loggerFactory);
+        this.nullService = new NullService(this);
+        this.service = nullService;
+        this.log = loggerFactory.getLogger(getClass());
+        this.disconnectListener = this;
         this.reader = new Reader(this);
-        this.encoder = new Encoder(config.getRandomFactory().create(), writeLock);
+        this.encoder = new Encoder(config.getRandomFactory().create(), writeLock, loggerFactory);
         this.decoder = new Decoder(this);
         this.kexer = new KeyExchanger(this);
         this.clientID = String.format("SSH-2.0-%s", config.getVersion());
@@ -135,16 +144,21 @@ public final class TransportImpl
     @Deprecated
     public TransportImpl(Config config, SSHClient sshClient) {
         this.config = config;
+        this.loggerFactory = config.getLoggerFactory();
+        this.serviceAccept = new Event<TransportException>("service accept", TransportException.chainer, loggerFactory);
+        this.close = new Event<TransportException>("transport close", TransportException.chainer, loggerFactory);
+        this.log = loggerFactory.getLogger(getClass());
+        this.nullService = new NullService(this);
+        this.service = nullService;
+        this.disconnectListener = this;
         this.reader = new Reader(this);
-        this.encoder = new Encoder(config.getRandomFactory().create(), writeLock);
+        this.encoder = new Encoder(config.getRandomFactory().create(), writeLock, loggerFactory);
         this.decoder = new Decoder(this);
         this.kexer = new KeyExchanger(this);
         this.clientID = String.format("SSH-2.0-%s", config.getVersion());
         this.sshClient = sshClient;
     }
 
-
-
     @Override
     public void init(String remoteHost, int remotePort, InputStream in, OutputStream out)
             throws TransportException {
@@ -170,18 +184,30 @@ public final class TransportImpl
         reader.start();
     }
 
+    /**
+     * TransportImpl implements its own default DisconnectListener.
+     */
+    @Override
+    public void notifyDisconnect(DisconnectReason reason, String message) {
+        log.info("Disconnected - {}", reason);
+    }
+
     private void receiveServerIdent() throws IOException {
         final Buffer.PlainBuffer buf = new Buffer.PlainBuffer();
         while ((serverID = readIdentification(buf)).isEmpty()) {
             int b = connInfo.in.read();
-            if (b == -1)
+            if (b == -1) {
+                log.error("Received end of connection, but no identification received. ");
                 throw new TransportException("Server closed connection during identification exchange");
+
+            }
             buf.putByte((byte) b);
         }
     }
 
     /**
      * Receive the server identification string.
+     *
      * @throws IOException If there was an error writing to the outputstream.
      */
     private void sendClientIdent() throws IOException {
@@ -200,49 +226,19 @@ public final class TransportImpl
      * This is not efficient but is only done once.
      *
      * @param buffer The buffer to read from.
-     *
      * @return empty string if full ident string has not yet been received
-     *
      * @throws IOException
      */
     private String readIdentification(Buffer.PlainBuffer buffer)
             throws IOException {
-        String ident;
-
-        byte[] data = new byte[256];
-        for (; ; ) {
-            int savedBufPos = buffer.rpos();
-            int pos = 0;
-            boolean needLF = false;
-            for (; ; ) {
-                if (buffer.available() == 0) {
-                    // Need more data, so undo reading and return null
-                    buffer.rpos(savedBufPos);
-                    return "";
-                }
-                byte b = buffer.readByte();
-                if (b == '\r') {
-                    needLF = true;
-                    continue;
-                }
-                if (b == '\n')
-                    break;
-                if (needLF)
-                    throw new TransportException("Incorrect identification: bad line ending");
-                if (pos >= data.length)
-                    throw new TransportException("Incorrect identification: line too long");
-                data[pos++] = b;
-            }
-            ident = new String(data, 0, pos);
-            if (ident.startsWith("SSH-"))
-                break;
-            if (buffer.rpos() > 16 * 1024)
-                throw new TransportException("Incorrect identification: too many header lines");
+        String ident = new IdentificationStringParser(buffer, loggerFactory).parseIdentificationString();
+        if (ident.isEmpty()) {
+            return ident;
         }
 
         if (!ident.startsWith("SSH-2.0-") && !ident.startsWith("SSH-1.99-"))
             throw new TransportException(DisconnectReason.PROTOCOL_VERSION_NOT_SUPPORTED,
-                                         "Server does not support SSHv2, identified as: " + ident);
+                    "Server does not support SSHv2, identified as: " + ident);
 
         return ident;
     }
@@ -353,7 +349,6 @@ public final class TransportImpl
      * Sends a service request for the specified service
      *
      * @param serviceName name of the service being requested
-     *
      * @throws TransportException if there is an error while sending the request
      */
     private void sendServiceRequest(String serviceName)
@@ -427,7 +422,7 @@ public final class TransportImpl
 
     @Override
     public void setDisconnectListener(DisconnectListener listener) {
-        this.disconnectListener = listener == null ? nullDisconnectListener : listener;
+        this.disconnectListener = listener == null ? this : listener;
     }
 
     @Override
@@ -472,9 +467,9 @@ public final class TransportImpl
         log.debug("Sending SSH_MSG_DISCONNECT: reason=[{}], msg=[{}]", reason, message);
         try {
             write(new SSHPacket(Message.DISCONNECT)
-                          .putUInt32(reason.toInt())
-                          .putString(message)
-                          .putString(""));
+                    .putUInt32(reason.toInt())
+                    .putString(message)
+                    .putString(""));
         } catch (IOException worthless) {
             log.debug("Error writing packet: {}", worthless.toString());
         }
@@ -492,7 +487,6 @@ public final class TransportImpl
      *
      * @param msg the message identifer
      * @param buf buffer containg rest of the packet
-     *
      * @throws SSHException if an error occurs during handling (unrecoverable)
      */
     @Override
@@ -510,32 +504,27 @@ public final class TransportImpl
 
         else
             switch (msg) {
-                case DISCONNECT: {
+                case DISCONNECT:
                     gotDisconnect(buf);
                     break;
-                }
-                case IGNORE: {
+                case IGNORE:
                     log.debug("Received SSH_MSG_IGNORE");
                     break;
-                }
-                case UNIMPLEMENTED: {
+                case UNIMPLEMENTED:
                     gotUnimplemented(buf);
                     break;
-                }
-                case DEBUG: {
+                case DEBUG:
                     gotDebug(buf);
                     break;
-                }
-                case SERVICE_ACCEPT: {
+                case SERVICE_ACCEPT:
                     gotServiceAccept();
                     break;
-                }
-                case USERAUTH_BANNER: {
+                case USERAUTH_BANNER:
                     log.debug("Received USERAUTH_BANNER");
                     break;
-                }
                 default:
                     sendUnimplemented();
+                    break;
             }
     }
 
@@ -568,7 +557,7 @@ public final class TransportImpl
         try {
             if (!serviceAccept.hasWaiters())
                 throw new TransportException(DisconnectReason.PROTOCOL_ERROR,
-                                             "Got a service accept notification when none was awaited");
+                        "Got a service accept notification when none was awaited");
             serviceAccept.set();
         } finally {
             serviceAccept.unlock();
@@ -579,7 +568,6 @@ public final class TransportImpl
      * Got an SSH_MSG_UNIMPLEMENTED, so lets see where we're at and act accordingly.
      *
      * @param packet The 'unimplemented' packet received
-     *
      * @throws TransportException
      */
     private void gotUnimplemented(SSHPacket packet)

src/main/java/net/schmizz/sshj/transport/cipher/BaseCipher.java

@@ -19,7 +19,6 @@ import net.schmizz.sshj.common.SSHRuntimeException;
 import net.schmizz.sshj.common.SecurityUtils;
 
 import javax.crypto.ShortBufferException;
-import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
 import java.security.GeneralSecurityException;
 import java.security.InvalidAlgorithmParameterException;

src/main/java/net/schmizz/sshj/transport/cipher/NoneCipher.java

@@ -46,10 +46,12 @@ public class NoneCipher
 
     @Override
     public void init(Mode mode, byte[] bytes, byte[] bytes1) {
+        // Nothing to do
     }
 
     @Override
     public void update(byte[] input, int inputOffset, int inputLen) {
+        // Nothing to do
     }
 
 }

src/main/java/net/schmizz/sshj/transport/digest/SHA384.java

@@ -16,22 +16,26 @@
 package net.schmizz.sshj.transport.digest;
 
 public class SHA384 extends BaseDigest {
-/** Named factory for SHA384 digest */
-public static class Factory
-        implements net.schmizz.sshj.common.Factory.Named<Digest> {
+    /**
+     * Named factory for SHA384 digest
+     */
+    public static class Factory
+            implements net.schmizz.sshj.common.Factory.Named<Digest> {
 
-    @Override
-    public Digest create() {
-        return new SHA384();
+        @Override
+        public Digest create() {
+            return new SHA384();
+        }
+
+        @Override
+        public String getName() {
+            return "sha384";
+        }
     }
 
-    @Override
-    public String getName() {
-        return "sha384";
-    }
-}
-
-    /** Create a new instance of a SHA384 digest */
+    /**
+     * Create a new instance of a SHA384 digest
+     */
     public SHA384() {
         super("SHA-384", 48);
     }

src/main/java/net/schmizz/sshj/transport/digest/SHA512.java

@@ -16,22 +16,26 @@
 package net.schmizz.sshj.transport.digest;
 
 public class SHA512 extends BaseDigest {
-/** Named factory for SHA384 digest */
-public static class Factory
-        implements net.schmizz.sshj.common.Factory.Named<Digest> {
+    /**
+     * Named factory for SHA384 digest
+     */
+    public static class Factory
+            implements net.schmizz.sshj.common.Factory.Named<Digest> {
 
-    @Override
-    public Digest create() {
-        return new SHA512();
+        @Override
+        public Digest create() {
+            return new SHA512();
+        }
+
+        @Override
+        public String getName() {
+            return "sha512";
+        }
     }
 
-    @Override
-    public String getName() {
-        return "sha512";
-    }
-}
-
-    /** Create a new instance of a SHA384 digest */
+    /**
+     * Create a new instance of a SHA384 digest
+     */
     public SHA512() {
         super("SHA-512", 64);
     }

src/main/java/net/schmizz/sshj/transport/kex/AbstractDH.java

@@ -18,8 +18,6 @@ package net.schmizz.sshj.transport.kex;
 import net.schmizz.sshj.transport.digest.Digest;
 
 import java.math.BigInteger;
-import java.security.PublicKey;
-import java.util.Arrays;
 
 public abstract class AbstractDH extends KeyExchangeBase {
     protected final DHBase dh;

src/main/java/net/schmizz/sshj/transport/kex/AbstractDHG.java

@@ -15,24 +15,15 @@
  */
 package net.schmizz.sshj.transport.kex;
 
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.DisconnectReason;
-import net.schmizz.sshj.common.Factory;
-import net.schmizz.sshj.common.KeyType;
-import net.schmizz.sshj.common.Message;
-import net.schmizz.sshj.common.SSHPacket;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.signature.Signature;
 import net.schmizz.sshj.transport.Transport;
 import net.schmizz.sshj.transport.TransportException;
 import net.schmizz.sshj.transport.digest.Digest;
-import net.schmizz.sshj.transport.digest.SHA1;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.math.BigInteger;
 import java.security.GeneralSecurityException;
-import java.security.PublicKey;
-import java.util.Arrays;
 
 /**
  * Base class for DHG key exchange algorithms. Implementations will only have to configure the required data on the

src/main/java/net/schmizz/sshj/transport/kex/AbstractDHGex.java

@@ -103,7 +103,7 @@ public abstract class AbstractDHGex extends AbstractDH {
             throw new GeneralSecurityException("Server generated gex p is out of range (" + bitLength + " bits)");
         }
         log.debug("Received server p bitlength {}", bitLength);
-        dh.init(new DHParameterSpec(p, g));
+        dh.init(new DHParameterSpec(p, g), trans.getConfig().getRandomFactory());
         log.debug("Sending {}", Message.KEX_DH_GEX_INIT);
         trans.write(new SSHPacket(Message.KEX_DH_GEX_INIT).putBytes(dh.getE()));
         return false;

src/main/java/net/schmizz/sshj/transport/kex/Curve25519DH.java

@@ -15,25 +15,19 @@
  */
 package net.schmizz.sshj.transport.kex;
 
-import net.schmizz.sshj.common.SecurityUtils;
+import java.math.BigInteger;
+import java.security.GeneralSecurityException;
+import java.security.spec.AlgorithmParameterSpec;
+import java.util.Arrays;
 import org.bouncycastle.asn1.x9.X9ECParameters;
 import org.bouncycastle.crypto.ec.CustomNamedCurves;
 import org.bouncycastle.jce.spec.ECParameterSpec;
-import org.bouncycastle.math.ec.ECFieldElement;
-import org.bouncycastle.math.ec.custom.djb.Curve25519;
 
-import java.math.BigInteger;
-import java.security.*;
-import java.security.interfaces.ECPublicKey;
-import java.security.spec.AlgorithmParameterSpec;
-import java.security.spec.ECPoint;
-import java.security.spec.ECPublicKeySpec;
-import java.util.Arrays;
-import java.util.BitSet;
+import net.schmizz.sshj.common.Factory;
+import net.schmizz.sshj.transport.random.Random;
 
 public class Curve25519DH extends DHBase {
 
-
     private byte[] secretKey;
 
     public Curve25519DH() {
@@ -48,10 +42,10 @@ public class Curve25519DH extends DHBase {
     }
 
     @Override
-    public void init(AlgorithmParameterSpec params) throws GeneralSecurityException {
-        SecureRandom secureRandom = new SecureRandom();
+    public void init(AlgorithmParameterSpec params, Factory<Random> randomFactory) throws GeneralSecurityException {
+        Random random = randomFactory.create();
         byte[] secretBytes =  new byte[32];
-        secureRandom.nextBytes(secretBytes);
+        random.fill(secretBytes);
         byte[] publicBytes = new byte[32];
         djb.Curve25519.keygen(publicBytes, null, secretBytes);
         this.secretKey = Arrays.copyOf(secretBytes, secretBytes.length);

src/main/java/net/schmizz/sshj/transport/kex/Curve25519SHA256.java

@@ -15,18 +15,11 @@
  */
 package net.schmizz.sshj.transport.kex;
 
-import net.schmizz.sshj.common.*;
-import net.schmizz.sshj.signature.Signature;
-import net.schmizz.sshj.transport.TransportException;
 import net.schmizz.sshj.transport.digest.SHA256;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.security.GeneralSecurityException;
 
 public class Curve25519SHA256 extends AbstractDHG {
-    private static final Logger logger = LoggerFactory.getLogger(Curve25519SHA256.class);
-
     /** Named factory for Curve25519SHA256 key exchange */
     public static class Factory
             implements net.schmizz.sshj.common.Factory.Named<KeyExchange> {
@@ -48,6 +41,6 @@ public class Curve25519SHA256 extends AbstractDHG {
 
     @Override
     protected void initDH(DHBase dh) throws GeneralSecurityException {
-        dh.init(Curve25519DH.getCurve25519Params());
+        dh.init(Curve25519DH.getCurve25519Params(), trans.getConfig().getRandomFactory());
     }
 }

src/main/java/net/schmizz/sshj/transport/kex/DH.java

@@ -15,8 +15,10 @@
  */
 package net.schmizz.sshj.transport.kex;
 
+import net.schmizz.sshj.common.Factory;
 import net.schmizz.sshj.common.SSHRuntimeException;
 import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.transport.random.Random;
 
 import javax.crypto.spec.DHParameterSpec;
 import javax.crypto.spec.DHPublicKeySpec;
@@ -38,7 +40,7 @@ public class DH extends DHBase {
     }
 
     @Override
-    protected void init(AlgorithmParameterSpec params) throws GeneralSecurityException {
+    public void init(AlgorithmParameterSpec params, Factory<Random> randomFactory) throws GeneralSecurityException {
         if (!(params instanceof DHParameterSpec)) {
             throw new SSHRuntimeException("Wrong algorithm parameters for Diffie Hellman");
         }

src/main/java/net/schmizz/sshj/transport/kex/DHBase.java

@@ -15,8 +15,10 @@
  */
 package net.schmizz.sshj.transport.kex;
 
+import net.schmizz.sshj.common.Factory;
 import net.schmizz.sshj.common.SSHRuntimeException;
 import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.transport.random.Random;
 
 import javax.crypto.KeyAgreement;
 import java.math.BigInteger;
@@ -24,7 +26,7 @@ import java.security.GeneralSecurityException;
 import java.security.KeyPairGenerator;
 import java.security.spec.AlgorithmParameterSpec;
 
-abstract class DHBase {
+public abstract class DHBase {
     protected final KeyPairGenerator generator;
     protected final KeyAgreement agreement;
 
@@ -42,7 +44,7 @@ abstract class DHBase {
 
     abstract void computeK(byte[] f) throws GeneralSecurityException;
 
-    protected abstract void init(AlgorithmParameterSpec params) throws GeneralSecurityException;
+    public abstract void init(AlgorithmParameterSpec params, Factory<Random> randomFactory) throws GeneralSecurityException;
 
     void setE(byte[] e) {
         this.e = e;

src/main/java/net/schmizz/sshj/transport/kex/DHG1.java

@@ -26,6 +26,7 @@ import java.security.GeneralSecurityException;
  * @see <a href="http://www.ietf.org/rfc/rfc4253.txt">RFC 4253</a>
  *
  * TODO refactor away the (unneeded) class
+ * @deprecated Replaced by {@link com.hierynomus.sshj.transport.kex.DHG} with {@link com.hierynomus.sshj.transport.kex.DHGroups}
  */
 public class DHG1
         extends AbstractDHG {
@@ -51,6 +52,6 @@ public class DHG1
 
     @Override
     protected void initDH(DHBase dh) throws GeneralSecurityException {
-        dh.init(new DHParameterSpec(DHGroupData.P1, DHGroupData.G));
+        dh.init(new DHParameterSpec(DHGroupData.P1, DHGroupData.G), trans.getConfig().getRandomFactory());
     }
 }

src/main/java/net/schmizz/sshj/transport/kex/DHG14.java

@@ -25,6 +25,8 @@ import java.security.GeneralSecurityException;
  * <p/>
  * DHG14 does not work with the default JCE implementation provided by Sun because it does not support 2048 bits
  * encryption. It requires BouncyCastle to be used.
+ *
+ * @deprecated Replaced by {@link com.hierynomus.sshj.transport.kex.DHG} with {@link com.hierynomus.sshj.transport.kex.DHGroups}
  */
 public class DHG14
         extends AbstractDHG {
@@ -51,6 +53,6 @@ public class DHG14
 
     @Override
     protected void initDH(DHBase dh) throws GeneralSecurityException {
-        dh.init(new DHParameterSpec(DHGroupData.P14, DHGroupData.G));
+        dh.init(new DHParameterSpec(DHGroupData.P14, DHGroupData.G), trans.getConfig().getRandomFactory());
     }
 }

src/main/java/net/schmizz/sshj/transport/kex/DHGroupData.java

@@ -17,26 +17,139 @@ package net.schmizz.sshj.transport.kex;
 
 import java.math.BigInteger;
 
-/** Simple class holding the data for DH group key exchanges. */
+/**
+ * Simple class holding the data for DH group key exchanges.
+ */
 public final class DHGroupData {
 
     public static final BigInteger G =
             new BigInteger("2");
 
+    /**
+     * First Oakley Group (https://tools.ietf.org/html/rfc2409) - P1
+     * prime: 2^768 - 2 ^704 - 1 + 2^64 * { [2^638 pi] + 149686 }
+     */
     public static final BigInteger P1 =
             new BigInteger("1797693134862315907708391567937874531978602960487560117064444236841971802161585193" +
-                                   "6894783379586492554150218056548598050364644054819923910005079287700335581663922955" +
-                                   "3136239076508735759914822574862575007425302077447712589550957937778424442426617334" +
-                                   "727629299387668709205606050270810842907692932019128194467627007");
+                    "6894783379586492554150218056548598050364644054819923910005079287700335581663922955" +
+                    "3136239076508735759914822574862575007425302077447712589550957937778424442426617334" +
+                    "727629299387668709205606050270810842907692932019128194467627007");
 
+    /**
+     * 2048-bit MODP Group - P14 (https://tools.ietf.org/html/rfc3526#section-3)
+     * prime: 2^2048 - 2^1984 - 1 + 2^64 * { [2^1918 pi] + 124476 }
+     */
     public static final BigInteger P14 =
             new BigInteger("3231700607131100730033891392642382824881794124114023911284200975140074170663435422" +
-                                   "2619689417363569347117901737909704191754605873209195028853758986185622153212175412" +
-                                   "5149017745202702357960782362488842461894775876411059286460994117232454266225221932" +
-                                   "3054091903768052423551912567971587011700105805587765103886184728025797605490356973" +
-                                   "2561526167081339361799541336476559160368317896729073178384589680639671900977202194" +
-                                   "1686472258710314113364293195361934716365332097170774482279885885653692086452966360" +
-                                   "7725026895550592836275112117409697299806841055435958486658329164213621823107899099" +
-                                   "9448652468262416972035911852507045361090559");
+                    "2619689417363569347117901737909704191754605873209195028853758986185622153212175412" +
+                    "5149017745202702357960782362488842461894775876411059286460994117232454266225221932" +
+                    "3054091903768052423551912567971587011700105805587765103886184728025797605490356973" +
+                    "2561526167081339361799541336476559160368317896729073178384589680639671900977202194" +
+                    "1686472258710314113364293195361934716365332097170774482279885885653692086452966360" +
+                    "7725026895550592836275112117409697299806841055435958486658329164213621823107899099" +
+                    "9448652468262416972035911852507045361090559");
 
+    /**
+     * 3072-bit MODP Group - P15 (https://tools.ietf.org/html/rfc3526#section-4)
+     * prime: 2^3072 - 2^3008 - 1 + 2^64 * { [2^2942 pi] + 1690314 }
+     */
+    public static final BigInteger P15 =
+            new BigInteger("5809605995369958062791915965639201402176612226902900533702900882779736177890990861" +
+                    "4720947744773395811473734101856463783280437298007504700982109244878669350591643715" +
+                    "8816804754094398164451663275506750162643455639819318662899007124866081936120511979" +
+                    "3693985433297036118232914410171876807536457391277857011849897410207519105333355801" +
+                    "1211093568974594262718454713979526759594407934930716283941227805101246184882326024" +
+                    "6464987685045886124578424092925842628769970531258450962541951346360515542801716571" +
+                    "4465363094021609290561084025893662561222573202082865797821865270991145082200656978" +
+                    "1771928270245389902399691755461907706456858934380117144304264093386763147435711545" +
+                    "3714203157300427642870143303638180170530865983075119035294602548205993130657100472" +
+                    "7362479688415574702596946457770284148435989129632853918392117997472632693078113129" +
+                    "8864873993477969827727846158652326212896569442842168246113187097645351525073541163" +
+                    "44703769998514148343807");
+
+    /**
+     * 4096-bit MODP Group - P16 (https://tools.ietf.org/html/rfc3526#section-5)
+     * prime: 2^4096 - 2^4032 - 1 + 2^64 * { [2^3966 pi] + 240904 }
+     */
+    public static final BigInteger P16 =
+            new BigInteger("10443888814131525066796027198465295458312690609921350090225887564443381720223226907" +
+                    "10444046669809783930111585737890362691860127079270495454517218673016928427459146001" +
+                    "86688577976298222932119236830334623520436805101030915567415569746034717694639407653" +
+                    "51572849948952848216337009218117167389724518349794558970103063334685907513583651387" +
+                    "82250372269117968985194322444535687415522007151638638141456178420621277822674995027" +
+                    "99027867345862954439173691976629900551150544617766815444623488266596168079657690319" +
+                    "91160893476349471877789065280080047566925716669229641225661745827767073324523710012" +
+                    "72163776841229318324903125740713574141005124561965913888899753461735347970011693256" +
+                    "31675166067895083002751025580484610558346505544661509044430958305077580850929704003" +
+                    "96800574353422539265662408981958636315888889363641299200593084556694540340103914782" +
+                    "38784189888594672336242763795138176353222845524644040094258962433613354036104643881" +
+                    "92523848922401019419308891166616558422942466816544168892779046060826486420423771700" +
+                    "20547443379889419746612146996897065215430062626045358909981257522759426087721743761" +
+                    "07314217749233048217904944409836238235772306749874396760463376480215133461333478395" +
+                    "682746608242585133953883882226786118030184028136755970045385534758453247");
+
+    /**
+     * 6144-bit MODP Group - P17 (https://tools.ietf.org/html/rfc3526#section-6)
+     * prime: 2^6144 - 2^6080 - 1 + 2^64 * { [2^6014 pi] + 929484 }
+     */
+    public static final BigInteger P17 =
+            new BigInteger("3375152182143856118451852315996741233006489780574184654817389047442942990132667244" +
+                    "5203235101919165483964194359460994881062089387893762814044257438204432573941083014" +
+                    "8270060902589258751610180963277323358005958319159760142088223040073278481327349332" +
+                    "9788580321367526156496260334045722077682632250005809131096725397661997398803366366" +
+                    "6385188155212656268079501726223369693427999804134467810120772356498596945532366527" +
+                    "4005175754719693358549052745041195095923660137119541482588848792245999152034563158" +
+                    "8103477655308367699571833559858639559116999957082451503501754353335269752528775333" +
+                    "2500527176569576894926734950469293596134095086603716860086302051544539652689091299" +
+                    "0997845889190523834630577894405654606814419024423999564190605216296046973478790246" +
+                    "5431380018607831652696452928806274087901103517592005919217856147319900620589671943" +
+                    "5014765345518490882366607110905303449152556221163232127426440691921134648766635695" +
+                    "8502392313045917442156109850296368954067188807663082492273159842675422662594896843" +
+                    "7222391644541101590050623941926790971632033120898897818086898743162371034761799235" +
+                    "6201449023892203230133009421463914291201346063125219636964261683591541014344239275" +
+                    "3407356909977322220697587739633908763605465157552805170421605254873028981223116697" +
+                    "9967944753045360039934269703271445854959128593945394903498124811432232236723864504" +
+                    "2515984447890788917823576330019151696568654314153058547592091366014550143819685170" +
+                    "0683437001046776090411663697600809334136054989623820777788455998349074759534307874" +
+                    "4620138456732853067527579296235488377080690082718368571835346957473168052062194454" +
+                    "0947734619035177180057973022652571032196598229259194875709994709721793154158686515" +
+                    "7485072742241813169487971046010682120152329216914824963468544136987197501906011027" +
+                    "0527448105054323981513068607360107630451228454921845984604608225359676243382741906" +
+                    "0089029417044871218316020923109988915707117567");
+
+    /**
+     * 8192-bit MODP Group - P18 (https://tools.ietf.org/html/rfc3526#section-7)
+     * prime: 2^8192 - 2^8128 - 1 + 2^64 * { [2^8062 pi] + 4743158 }
+     */
+    public static final BigInteger P18 =
+            new BigInteger("10907481356194159294502949293597845003481551249531722117741011069661501689227856390" +
+                    "28532473848836817769712164169076432969224698752674677662739994265785437233596157045" +
+                    "97092233804069810050786103304731233182398243527947570019986097161273254052879655450" +
+                    "28679197467769837593914759871425213158787195775191488118308799194269399584870875409" +
+                    "65716419167467499326156226529675209172277001377591248147563782880558861083327174154" +
+                    "01497513489312511601577631889029596069801161415772128252753946881651931933333750311" +
+                    "47771923604122817210189558343776154804684792527488673203623853555966017951228067562" +
+                    "17713579819870634321561907813255153703950795271232652404894983869492174481652303803" +
+                    "49888136621050864726366837651413103110233683748899977574404673365182723939535354034" +
+                    "84148728546397192946943234501868841898225445406472269872921606931847346549419069366" +
+                    "46576130260972193280317171696418971553954161446191759093719524951116705577362073481" +
+                    "31929604120128351615426904438925772770028968411946028348045230620413002491387998113" +
+                    "59080269838682059693181678196808509986496944169079527129049624049377757896989172073" +
+                    "56355227455066183815847669135530549755439819480321732925869069136146085326382334628" +
+                    "74545639807160305805163420938670870330654590319960852382451372962513665912822110096" +
+                    "77354505199524042481982628138310973742616503800172779169753241348465746813073370173" +
+                    "80830353680623216336949471306191686438249305686413380231046096450953594089375540285" +
+                    "03729247092939511402830554745258496207430943815182543790297601289174935519867842060" +
+                    "37220349003113648930464957614043339386861400378480309162925432736845336400326376391" +
+                    "00774502371542479302473698388692892420946478947733800387782741417786484770190108867" +
+                    "87977899163321862864053398261932246615488301145229189025233648723608665439609385389" +
+                    "86288058131775591620763631544364944775078712941198416378677017221666098312018454840" +
+                    "78070518041336869808398454625586921201308185638888082699408686536045192649569198110" +
+                    "35365994311180230063610650986502394366182943642656300791728205089442938884174888539" +
+                    "82907077430529736053592775157496197308237732158947551217614678878653277071155738042" +
+                    "64519206349215850195195364813387526811742474131549802130246506341207020335797706780" +
+                    "70540694527543880626597851620970679570257924407538049023174103086261496878330620786" +
+                    "96878681084236399719832090776247580804999882755913927872676271824428928096468742282" +
+                    "63172435642368588260139161962836121481966092745325488641054238839295138992979335446" +
+                    "110090325230955276870524611359124918392740353154294858383359");
 }

src/main/java/net/schmizz/sshj/transport/kex/ECDH.java

@@ -15,7 +15,9 @@
  */
 package net.schmizz.sshj.transport.kex;
 
+import net.schmizz.sshj.common.Factory;
 import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.transport.random.Random;
 
 import java.math.BigInteger;
 import java.security.GeneralSecurityException;
@@ -23,7 +25,10 @@ import java.security.KeyFactory;
 import java.security.KeyPair;
 import java.security.PublicKey;
 import java.security.interfaces.ECPublicKey;
-import java.security.spec.*;
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.ECParameterSpec;
+import java.security.spec.ECPoint;
+import java.security.spec.ECPublicKeySpec;
 
 import static com.hierynomus.sshj.secg.SecgUtils.getDecoded;
 import static com.hierynomus.sshj.secg.SecgUtils.getEncoded;
@@ -36,7 +41,7 @@ public class ECDH extends DHBase {
         super("EC", "ECDH");
     }
 
-    protected void init(AlgorithmParameterSpec params) throws GeneralSecurityException {
+    public void init(AlgorithmParameterSpec params, Factory<Random> randomFactory) throws GeneralSecurityException {
         generator.initialize(params);
         KeyPair keyPair = generator.generateKeyPair();
         agreement.init(keyPair.getPrivate());

src/main/java/net/schmizz/sshj/transport/kex/ECDHNistP.java

@@ -79,7 +79,7 @@ public class ECDHNistP extends AbstractDHG {
 
     @Override
     protected void initDH(DHBase dh) throws GeneralSecurityException {
-        dh.init(new ECNamedCurveGenParameterSpec(curve));
+        dh.init(new ECNamedCurveGenParameterSpec(curve), trans.getConfig().getRandomFactory());
     }
 
 }

src/main/java/net/schmizz/sshj/transport/random/BouncyCastleRandom.java

@@ -17,6 +17,8 @@ package net.schmizz.sshj.transport.random;
 
 import org.bouncycastle.crypto.prng.RandomGenerator;
 import org.bouncycastle.crypto.prng.VMPCRandomGenerator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.security.SecureRandom;
 
@@ -27,6 +29,8 @@ import java.security.SecureRandom;
 public class BouncyCastleRandom
         implements Random {
 
+    private static final Logger logger = LoggerFactory.getLogger(BouncyCastleRandom.class);
+
     /** Named factory for the BouncyCastle <code>Random</code> */
     public static class Factory
             implements net.schmizz.sshj.common.Factory<Random> {
@@ -41,7 +45,10 @@ public class BouncyCastleRandom
     private final RandomGenerator random = new VMPCRandomGenerator();
 
     public BouncyCastleRandom() {
+        logger.info("Generating random seed from SecureRandom.");
+        long t = System.currentTimeMillis();
         byte[] seed = new SecureRandom().generateSeed(8);
+        logger.debug("Creating random seed took {} ms", System.currentTimeMillis() - t);
         random.addSeedMaterial(seed);
     }
 
@@ -50,4 +57,9 @@ public class BouncyCastleRandom
         random.nextBytes(bytes, start, len);
     }
 
+    @Override
+    public void fill(byte[] bytes) {
+        random.nextBytes(bytes);
+    }
+
 }

src/main/java/net/schmizz/sshj/transport/random/JCERandom.java

@@ -16,10 +16,13 @@
 package net.schmizz.sshj.transport.random;
 
 import java.security.SecureRandom;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /** A {@link Random} implementation using the built-in {@link SecureRandom} PRNG. */
 public class JCERandom
         implements Random {
+    private static final Logger logger = LoggerFactory.getLogger(JCERandom.class);
 
     /** Named factory for the JCE {@link Random} */
     public static class Factory
@@ -38,7 +41,14 @@ public class JCERandom
     }
 
     private byte[] tmp = new byte[16];
-    private final SecureRandom random = new SecureRandom();
+    private final SecureRandom random;
+
+    JCERandom() {
+        logger.info("Creating new SecureRandom.");
+        long t = System.currentTimeMillis();
+        random = new SecureRandom();
+        logger.debug("Random creation took {} ms", System.currentTimeMillis() - t);
+    }
 
     /**
      * Fill the given byte-array with random bytes from this PRNG.
@@ -49,15 +59,20 @@ public class JCERandom
      */
     @Override
     public synchronized void fill(byte[] foo, int start, int len) {
-        if (start == 0 && len == foo.length)
+        if (start == 0 && len == foo.length) {
             random.nextBytes(foo);
-        else
+        } else {
             synchronized (this) {
                 if (len > tmp.length)
                     tmp = new byte[len];
                 random.nextBytes(tmp);
                 System.arraycopy(tmp, 0, foo, start, len);
             }
+        }
     }
 
+    @Override
+    public void fill(final byte[] bytes) {
+        random.nextBytes(bytes);
+    }
 }

src/main/java/net/schmizz/sshj/transport/random/Random.java

@@ -18,6 +18,13 @@ package net.schmizz.sshj.transport.random;
 /** A pseudo random number generator. */
 public interface Random {
 
+    /**
+     * Fill the array of bytes with random values.
+     *
+     * @param bytes byte array to be filled.
+     */
+    void fill(byte[] bytes);
+
     /**
      * Fill part of bytes with random values.
      *

src/main/java/net/schmizz/sshj/transport/random/SingletonRandomFactory.java

@@ -37,4 +37,8 @@ public class SingletonRandomFactory
         random.fill(bytes, start, len);
     }
 
+    @Override
+    public void fill(final byte[] bytes) {
+        random.fill(bytes);
+    }
 }

src/main/java/net/schmizz/sshj/transport/verification/OpenSSHKnownHosts.java

@@ -15,25 +15,12 @@
  */
 package net.schmizz.sshj.transport.verification;
 
-import net.schmizz.sshj.common.Base64;
-import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.IOUtils;
-import net.schmizz.sshj.common.KeyType;
-import net.schmizz.sshj.common.SSHException;
-import net.schmizz.sshj.common.SecurityUtils;
+import net.schmizz.sshj.common.*;
 import net.schmizz.sshj.transport.mac.HMACSHA1;
 import net.schmizz.sshj.transport.mac.MAC;
 import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import java.io.BufferedOutputStream;
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.FileReader;
-import java.io.FileWriter;
-import java.io.IOException;
+import java.io.*;
 import java.math.BigInteger;
 import java.security.KeyFactory;
 import java.security.PublicKey;
@@ -50,29 +37,38 @@ import java.util.List;
 public class OpenSSHKnownHosts
         implements HostKeyVerifier {
 
-    private static final Logger LOG = LoggerFactory.getLogger(OpenSSHKnownHosts.class);
-    protected final Logger log = LoggerFactory.getLogger(getClass());
+    protected final Logger log;
 
     protected final File khFile;
     protected final List<HostEntry> entries = new ArrayList<HostEntry>();
 
     public OpenSSHKnownHosts(File khFile)
             throws IOException {
+        this(khFile, LoggerFactory.DEFAULT);
+    }
+
+    public OpenSSHKnownHosts(File khFile, LoggerFactory loggerFactory)
+            throws IOException {
         this.khFile = khFile;
+        log = loggerFactory.getLogger(getClass());
         if (khFile.exists()) {
+            final EntryFactory entryFactory = new EntryFactory();
             final BufferedReader br = new BufferedReader(new FileReader(khFile));
             try {
                 // Read in the file, storing each line as an entry
                 String line;
-                while ((line = br.readLine()) != null)
+                while ((line = br.readLine()) != null) {
                     try {
-                        HostEntry entry = EntryFactory.parseEntry(line);
+                        HostEntry entry = entryFactory.parseEntry(line);
                         if (entry != null) {
                             entries.add(entry);
                         }
                     } catch (SSHException ignore) {
                         log.debug("Bad line ({}): {} ", ignore.toString(), line);
+                    } catch (SSHRuntimeException ignore) {
+                        log.debug("Failed to process line ({}): {} ", ignore.toString(), line);
                     }
+                }
             } finally {
                 IOUtils.closeQuietly(br);
             }
@@ -185,9 +181,11 @@ public class OpenSSHKnownHosts
      * <p/>
      * Lines starting with `#' and empty lines are ignored as comments.
      */
-    public static class EntryFactory {
+    public class EntryFactory {
+        EntryFactory() {
+        }
 
-        public static HostEntry parseEntry(String line)
+        public HostEntry parseEntry(String line)
                 throws IOException {
             if (isComment(line)) {
                 return new CommentEntry(line);
@@ -201,7 +199,7 @@ public class OpenSSHKnownHosts
                 i++;
             }
             if(split.length < 3) {
-                LOG.error("Error reading entry `{}`", line);
+                log.error("Error reading entry `{}`", line);
                 return null;
             }
             final String hostnames = split[i++];
@@ -212,7 +210,7 @@ public class OpenSSHKnownHosts
 
             if (type != KeyType.UNKNOWN) {
                 final String sKey = split[i++];
-                key = getKey(sKey);
+                key = new Buffer.PlainBuffer(Base64.decode(sKey)).readPublicKey();
             } else if (isBits(sType)) {
                 type = KeyType.RSA;
                 // int bits = Integer.valueOf(sType);
@@ -222,11 +220,11 @@ public class OpenSSHKnownHosts
                     final KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                     key = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
                 } catch (Exception ex) {
-                    LOG.error("Error reading entry `{}`, could not create key", line, ex);
+                    log.error("Error reading entry `{}`, could not create key", line, ex);
                     return null;
                 }
             } else {
-                LOG.error("Error reading entry `{}`, could not determine type", line);
+                log.error("Error reading entry `{}`, could not determine type", line);
                 return null;
             }
 
@@ -237,12 +235,7 @@ public class OpenSSHKnownHosts
             }
         }
 
-        private static PublicKey getKey(String sKey)
-                throws IOException {
-            return new Buffer.PlainBuffer(Base64.decode(sKey)).readPublicKey();
-        }
-
-        private static boolean isBits(String type) {
+        private boolean isBits(String type) {
             try {
                 Integer.parseInt(type);
                 return true;
@@ -251,17 +244,24 @@ public class OpenSSHKnownHosts
             }
         }
 
-        private static boolean isComment(String line) {
+        private boolean isComment(String line) {
             return line.isEmpty() || line.startsWith("#");
         }
 
-        public static boolean isHashed(String line) {
+        public boolean isHashed(String line) {
             return line.startsWith("|1|");
         }
 
     }
 
     public interface HostEntry {
+        KeyType getType();
+
+        String getFingerprint();
+
+        boolean appliesTo(String host)
+                throws IOException;
+
         boolean appliesTo(KeyType type, String host)
                 throws IOException;
 
@@ -279,6 +279,22 @@ public class OpenSSHKnownHosts
             this.comment = comment;
         }
 
+        @Override
+        public KeyType getType() {
+            return KeyType.UNKNOWN;
+        }
+
+        @Override
+        public String getFingerprint() {
+            return null;
+        }
+
+        @Override
+        public boolean appliesTo(String host)
+                throws IOException {
+            return false;
+        }
+
         @Override
         public boolean appliesTo(KeyType type, String host) {
             return false;
@@ -308,6 +324,16 @@ public class OpenSSHKnownHosts
             this.key = key;
         }
 
+        @Override
+        public KeyType getType() {
+            return type;
+        }
+
+        @Override
+        public String getFingerprint() {
+            return SecurityUtils.getFingerprint(key);
+        }
+
         @Override
         public boolean verify(PublicKey key)
                 throws IOException {
@@ -349,6 +375,12 @@ public class OpenSSHKnownHosts
             return hostnames;
         }
 
+        @Override
+        public boolean appliesTo(String host)
+                throws IOException {
+            return hosts.contains(host);
+        }
+
         @Override
         public boolean appliesTo(KeyType type, String host)
                 throws IOException {
@@ -377,6 +409,12 @@ public class OpenSSHKnownHosts
             }
         }
 
+        @Override
+        public boolean appliesTo(String host)
+                 throws IOException {
+            return hashedHost.equals(hashHost(host));
+        }
+
         @Override
         public boolean appliesTo(KeyType type, String host)
                 throws IOException {
@@ -416,14 +454,14 @@ public class OpenSSHKnownHosts
         public String getMarkerString() {
             return sMarker;
         }
-        
+
         public static Marker fromString(String str) {
             for (Marker m: values())
                 if (m.sMarker.equals(str))
                     return m;
             return null;
         }
-        
+
     }
 
-}
+}

src/main/java/net/schmizz/sshj/userauth/UserAuthImpl.java

@@ -32,13 +32,14 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
-/** {@link UserAuth} implementation. */
+/**
+ * {@link UserAuth} implementation.
+ */
 public class UserAuthImpl
         extends AbstractService
         implements UserAuth {
 
-    private final Promise<Boolean, UserAuthException> authenticated
-            = new Promise<Boolean, UserAuthException>("authenticated", UserAuthException.chainer);
+    private final Promise<Boolean, UserAuthException> authenticated;
 
     // Externally available
     private volatile String banner = "";
@@ -51,6 +52,7 @@ public class UserAuthImpl
 
     public UserAuthImpl(Transport trans) {
         super("ssh-userauth", trans);
+        authenticated = new Promise<Boolean, UserAuthException>("authenticated", UserAuthException.chainer, trans.getConfig().getLoggerFactory());
     }
 
     @Override
@@ -111,22 +113,20 @@ public class UserAuthImpl
         try {
             switch (msg) {
 
-                case USERAUTH_BANNER: {
+                case USERAUTH_BANNER:
                     banner = buf.readString();
-                }
-                break;
+                    break;
 
-                case USERAUTH_SUCCESS: {
+                case USERAUTH_SUCCESS:
                     // In order to prevent race conditions, we immediately set the authenticated flag on the transport
                     // And change the service before delivering the authenticated promise.
                     // Should fix https://github.com/hierynomus/sshj/issues/237
                     trans.setAuthenticated(); // So it can put delayed compression into force if applicable
                     trans.setService(nextService); // We aren't in charge anymore, next service is
                     authenticated.deliver(true);
-                }
-                break;
+                    break;
 
-                case USERAUTH_FAILURE: {
+                case USERAUTH_FAILURE:
                     allowedMethods = Arrays.asList(buf.readString().split(","));
                     partialSuccess |= buf.readBoolean();
                     if (allowedMethods.contains(currentMethod.getName()) && currentMethod.shouldRetry()) {
@@ -134,18 +134,16 @@ public class UserAuthImpl
                     } else {
                         authenticated.deliver(false);
                     }
-                }
-                break;
+                    break;
 
-                default: {
+                default:
                     log.debug("Asking `{}` method to handle {} packet", currentMethod.getName(), msg);
                     try {
                         currentMethod.handle(msg, buf);
                     } catch (UserAuthException e) {
                         authenticated.deliverError(e);
                     }
-                }
-
+                    break;
             }
         } finally {
             authenticated.unlock();

src/main/java/net/schmizz/sshj/userauth/keyprovider/BaseFileKeyProvider.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.schmizz.sshj.userauth.keyprovider;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Reader;
+import java.security.KeyPair;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+
+import net.schmizz.sshj.common.KeyType;
+import net.schmizz.sshj.userauth.password.*;
+
+public abstract class BaseFileKeyProvider implements FileKeyProvider {
+    protected Resource<?> resource;
+    protected PasswordFinder pwdf;
+    protected KeyPair kp;
+
+    protected KeyType type;
+
+    @Override
+    public void init(Reader location) {
+        assert location != null;
+        resource = new PrivateKeyReaderResource(location);
+    }
+
+    @Override
+    public void init(Reader location, PasswordFinder pwdf) {
+        init(location);
+        this.pwdf = pwdf;
+    }
+
+    @Override
+    public void init(File location) {
+        assert location != null;
+        resource = new PrivateKeyFileResource(location.getAbsoluteFile());
+    }
+
+    @Override
+    public void init(File location, PasswordFinder pwdf) {
+        init(location);
+        this.pwdf = pwdf;
+    }
+
+    @Override
+    public void init(String privateKey, String publicKey) {
+        assert privateKey != null;
+        assert publicKey == null;
+        resource = new PrivateKeyStringResource(privateKey);
+    }
+
+    @Override
+    public void init(String privateKey, String publicKey, PasswordFinder pwdf) {
+        init(privateKey, publicKey);
+        this.pwdf = pwdf;
+    }
+
+    @Override
+    public PrivateKey getPrivate()
+            throws IOException {
+        return kp != null ? kp.getPrivate() : (kp = readKeyPair()).getPrivate();
+    }
+
+    @Override
+    public PublicKey getPublic()
+            throws IOException {
+        return kp != null ? kp.getPublic() : (kp = readKeyPair()).getPublic();
+    }
+
+    @Override
+    public KeyType getType()
+            throws IOException {
+        return type != null ? type : (type = KeyType.fromKey(getPublic()));
+    }
+
+
+    protected abstract KeyPair readKeyPair() throws IOException;
+}