Use StandardCharsets.UTF_8 (Java 1.7) (#998)

Co-authored-by: Jeroen van Erp <jeroen@hierynomus.com>

src/main/java/com/hierynomus/sshj/transport/verification/KnownHostMatchers.java

@@ -17,11 +17,11 @@ package com.hierynomus.sshj.transport.verification;
 
 import net.schmizz.sshj.common.Base64DecodingException;
 import net.schmizz.sshj.common.Base64Decoder;
-import net.schmizz.sshj.common.IOUtils;
 import net.schmizz.sshj.common.SSHException;
 import net.schmizz.sshj.transport.mac.MAC;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
@@ -96,7 +96,7 @@ public class KnownHostMatchers {
 
         private String hashHost(String host) throws IOException, Base64DecodingException {
             sha1.init(getSaltyBytes());
-            return "|1|" + salt + "|" + Base64.getEncoder().encodeToString(sha1.doFinal(host.getBytes(IOUtils.UTF8)));
+            return "|1|" + salt + "|" + Base64.getEncoder().encodeToString(sha1.doFinal(host.getBytes(StandardCharsets.UTF_8)));
         }
 
         private byte[] getSaltyBytes() throws IOException, Base64DecodingException {

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

@@ -59,6 +59,7 @@ import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.security.KeyPair;
 import java.util.*;
 
@@ -126,7 +127,7 @@ public class SSHClient
     private final List<LocalPortForwarder> forwarders = new ArrayList<LocalPortForwarder>();
 
     /** character set of the remote machine */
-    protected Charset remoteCharset = IOUtils.UTF8;
+    protected Charset remoteCharset = StandardCharsets.UTF_8;
 
     /** Default constructor. Initializes this object using {@link DefaultConfig}. */
     public SSHClient() {
@@ -765,7 +766,7 @@ public class SSHClient
      *        remote character set or {@code null} for default
      */
     public void setRemoteCharset(Charset remoteCharset) {
-        this.remoteCharset = remoteCharset != null ? remoteCharset : IOUtils.UTF8;
+        this.remoteCharset = remoteCharset != null ? remoteCharset : StandardCharsets.UTF_8;
     }
 
     @Override

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

@@ -17,6 +17,7 @@ package net.schmizz.sshj.common;
 
 import java.math.BigInteger;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.security.GeneralSecurityException;
 import java.security.PublicKey;
 import java.util.Arrays;
@@ -428,7 +429,7 @@ public class Buffer<T extends Buffer<T>> {
      */
     public String readString()
             throws BufferException {
-        return readString(IOUtils.UTF8);
+        return readString(StandardCharsets.UTF_8);
     }
 
     /**
@@ -454,7 +455,7 @@ public class Buffer<T extends Buffer<T>> {
     }
 
     public T putString(String string) {
-        return putString(string, IOUtils.UTF8);
+        return putString(string, StandardCharsets.UTF_8);
     }
 
     /**

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

@@ -17,8 +17,8 @@ package net.schmizz.sshj.common;
 
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
-import java.nio.charset.Charset;
 import java.nio.charset.CharsetEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 
 /** Utility functions for byte arrays. */
@@ -141,7 +141,7 @@ public class ByteArrayUtils {
      * @return UTF-8 bytes of the string
      */
     public static byte[] encodeSensitiveStringToUtf8(char[] str) {
-        CharsetEncoder charsetEncoder = Charset.forName("UTF-8").newEncoder();
+        CharsetEncoder charsetEncoder = StandardCharsets.UTF_8.newEncoder();
         ByteBuffer utf8Buffer = ByteBuffer.allocate((int) (str.length * charsetEncoder.maxBytesPerChar()));
         assert utf8Buffer.hasArray();
         charsetEncoder.encode(CharBuffer.wrap(str), utf8Buffer, true);

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

@@ -19,12 +19,9 @@ import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.charset.Charset;
 
 public class IOUtils {
 
-    public static final Charset UTF8 = Charset.forName("UTF-8");
-
     public static void closeQuietly(Closeable... closeables) {
         closeQuietly(LoggerFactory.DEFAULT, closeables);
     }

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

@@ -27,6 +27,7 @@ import org.slf4j.Logger;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.LinkedList;
 import java.util.Queue;
 import java.util.concurrent.TimeUnit;
@@ -90,7 +91,7 @@ public abstract class AbstractChannel
         this.log = loggerFactory.getLogger(getClass());
         this.trans = conn.getTransport();
 
-        this.remoteCharset = remoteCharset != null ? remoteCharset : IOUtils.UTF8;
+        this.remoteCharset = remoteCharset != null ? remoteCharset : StandardCharsets.UTF_8;
         id = conn.nextID();
 
         lwin = new Window.Local(conn.getWindowSize(), conn.getMaxPacketSize(), loggerFactory);

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

@@ -17,7 +17,6 @@ package net.schmizz.sshj.sftp;
 
 import com.hierynomus.sshj.common.ThreadNameProvider;
 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;
@@ -28,6 +27,7 @@ import java.io.Closeable;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Map;
@@ -373,7 +373,7 @@ public class SFTPEngine
     /** Using UTF-8 */
     protected static String readSingleName(Response res)
         throws IOException {
-        return readSingleName(res, IOUtils.UTF8);
+        return readSingleName(res, StandardCharsets.UTF_8);
     }
 
     /** Using any character set */

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

@@ -33,6 +33,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
@@ -207,7 +208,7 @@ public final class TransportImpl
      */
     private void sendClientIdent() throws IOException {
         log.info("Client identity string: {}", clientID);
-        connInfo.out.write((clientID + "\r\n").getBytes(IOUtils.UTF8));
+        connInfo.out.write((clientID + "\r\n").getBytes(StandardCharsets.UTF_8));
         connInfo.out.flush();
     }
 

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

@@ -31,6 +31,7 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Reader;
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.KeyFactory;
 import java.security.PublicKey;
 import java.security.spec.RSAPublicKeySpec;
@@ -189,7 +190,7 @@ public class OpenSSHKnownHosts
         final BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(khFile));
         try {
             for (KnownHostEntry entry : entries)
-                bos.write((entry.getLine() + LS).getBytes(IOUtils.UTF8));
+                bos.write((entry.getLine() + LS).getBytes(StandardCharsets.UTF_8));
         } finally {
             bos.close();
         }

src/main/java/net/schmizz/sshj/userauth/password/PrivateKeyFileResource.java

@@ -16,6 +16,7 @@
 package net.schmizz.sshj.userauth.password;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 
 public class PrivateKeyFileResource
         extends Resource<File> {
@@ -27,6 +28,6 @@ public class PrivateKeyFileResource
     @Override
     public Reader getReader()
             throws IOException {
-        return new InputStreamReader(new FileInputStream(getDetail()), "UTF-8");
+        return new InputStreamReader(new FileInputStream(getDetail()), StandardCharsets.UTF_8);
     }
 }

src/main/java/net/schmizz/sshj/xfer/scp/SCPEngine.java

@@ -29,6 +29,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 
 /** @see <a href="https://blogs.oracle.com/janp/entry/how_the_scp_protocol_works">SCP Protocol</a> */
 class SCPEngine {
@@ -128,7 +129,7 @@ class SCPEngine {
                 baos.write(x);
             }
         }
-        final String msg = baos.toString(IOUtils.UTF8.displayName());
+        final String msg = baos.toString(StandardCharsets.UTF_8.displayName());
         log.debug("Read message: `{}`", msg);
         return msg;
     }

src/test/java/com/hierynomus/sshj/test/util/FileUtil.java

@@ -18,6 +18,7 @@ package com.hierynomus.sshj.test.util;
 import net.schmizz.sshj.common.IOUtils;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 
 public class FileUtil {
 
@@ -34,12 +35,12 @@ public class FileUtil {
         FileInputStream fileInputStream = new FileInputStream(f);
         try {
             ByteArrayOutputStream byteArrayOutputStream = IOUtils.readFully(fileInputStream);
-            return byteArrayOutputStream.toString(IOUtils.UTF8.displayName());
+            return byteArrayOutputStream.toString(StandardCharsets.UTF_8.displayName());
         } finally {
             IOUtils.closeQuietly(fileInputStream);
         }
     }
-    
+
     public static boolean compareFileContents(File f1, File f2) throws IOException {
         return readFromFile(f1).equals(readFromFile(f2));
     }

src/test/java/net/schmizz/sshj/signature/SignatureDSATest.java

@@ -17,11 +17,11 @@ package net.schmizz.sshj.signature;
 
 import com.hierynomus.sshj.common.KeyAlgorithm;
 import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.IOUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.KeyFactory;
 import java.security.NoSuchAlgorithmException;
 import java.security.spec.DSAPrivateKeySpec;
@@ -47,7 +47,7 @@ public class SignatureDSATest {
         BigInteger q = new BigInteger(new byte[] { 0, -105, 96, 80, -113, 21, 35, 11, -52, -78, -110, -71, -126, -94, -21, -124, 11, -16, 88, 28, -11 });
         BigInteger g = new BigInteger(new byte[] { 0, -9, -31, -96, -123, -42, -101, 61, -34, -53, -68, -85, 92, 54, -72, 87, -71, 121, -108, -81, -69, -6, 58, -22, -126, -7, 87, 76, 11, 61, 7, -126, 103, 81, 89, 87, -114, -70, -44, 89, 79, -26, 113, 7, 16, -127, -128, -76, 73, 22, 113, 35, -24, 76, 40, 22, 19, -73, -49, 9, 50, -116, -56, -90, -31, 60, 22, 122, -117, 84, 124, -115, 40, -32, -93, -82, 30, 43, -77, -90, 117, -111, 110, -93, 127, 11, -6, 33, 53, 98, -15, -5, 98, 122, 1, 36, 59, -52, -92, -15, -66, -88, 81, -112, -119, -88, -125, -33, -31, 90, -27, -97, 6, -110, -117, 102, 94, -128, 123, 85, 37, 100, 1, 76, 59, -2, -49, 73, 42 });
 
-        byte[] data = "The Magic Words are Squeamish Ossifrage".getBytes(IOUtils.UTF8);
+        byte[] data = "The Magic Words are Squeamish Ossifrage".getBytes(StandardCharsets.UTF_8);
 
         // A previously signed and verified signature using the data and DSA key parameters above.
         byte[] dataSig = new byte[] { 0, 0, 0, 7, 115, 115, 104, 45, 100, 115, 115, 0, 0, 0, 40, 40, -71, 33, 105, -89, -107, 8, 26, -13, -90, 73, -103, 105, 112, 7, -59, -66, 46, 85, -27, 20, 82, 22, -113, -75, -86, -121, -42, -73, 78, 66, 93, -34, 39, -50, -93, 27, -5, 37, -92 };

src/test/java/net/schmizz/sshj/util/BufferTest.java

@@ -31,12 +31,12 @@
 package net.schmizz.sshj.util;
 
 import net.schmizz.sshj.common.Buffer;
-import net.schmizz.sshj.common.IOUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import java.io.UnsupportedEncodingException;
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.GeneralSecurityException;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -51,7 +51,7 @@ public class BufferTest {
     public void setUp()
             throws UnsupportedEncodingException, GeneralSecurityException {
         // for position test
-        byte[] data = "Hello".getBytes(IOUtils.UTF8);
+        byte[] data = "Hello".getBytes(StandardCharsets.UTF_8);
         posBuf = new Buffer.PlainBuffer(data);
         handyBuf = new Buffer.PlainBuffer();
     }

src/test/java/net/schmizz/sshj/util/gss/BogusGSSContext.java

@@ -15,13 +15,13 @@
  */
 package net.schmizz.sshj.util.gss;
 
-import net.schmizz.sshj.common.IOUtils;
 import org.ietf.jgss.*;
 
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 
 import static net.schmizz.sshj.util.gss.BogusGSSManager.unavailable;
@@ -34,7 +34,7 @@ public class BogusGSSContext
     private static final byte[] MIC = fromString("LGTM");
 
     private static byte[] fromString(String s) {
-        return s.getBytes(IOUtils.UTF8);
+        return s.getBytes(StandardCharsets.UTF_8);
     }
 
     private boolean initialized = false;