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Extracted ASN.1/DER encoding to method (#368)

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This commit is contained in:
charlesrgould
2017-10-04 05:06:37 -04:00
committed by Jeroen van Erp
parent ec46a7a489
commit c161fe26f6
4 changed files with 102 additions and 28 deletions
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36
src/main/java/net/schmizz/sshj/signature/SignatureDSA.java
View File

@@ -82,21 +82,10 @@ public class SignatureDSA
}
@Override
public boolean verify(byte[] incomingSig) {
byte[] extractSig = extractSig(incomingSig, "ssh-dss");
public boolean verify(byte[] sig) {
try {
// ASN.1
ByteArrayOutputStream os = new ByteArrayOutputStream();
ASN1OutputStream asn1OutputStream = new ASN1OutputStream(os);
ASN1EncodableVector vector = new ASN1EncodableVector();
BigInteger bigInteger = new BigInteger(1, Arrays.copyOfRange(extractSig, 0, 20));
vector.add(new ASN1Integer(bigInteger));
BigInteger bigInteger2 = new BigInteger(1, Arrays.copyOfRange(extractSig, 20, 40));
vector.add(new ASN1Integer(bigInteger2));
asn1OutputStream.writeObject(new DERSequence(vector));
asn1OutputStream.close();
byte[] finalSig = os.toByteArray();
return signature.verify(finalSig);
byte[] sigBlob = extractSig(sig, "ssh-dss");
return signature.verify(asnEncode(sigBlob));
} catch (SignatureException e) {
throw new SSHRuntimeException(e);
} catch (IOException e) {
@@ -104,4 +93,23 @@ public class SignatureDSA
}
}
/**
* Encodes the signature as a DER sequence (ASN.1 format).
*/
private byte[] asnEncode(byte[] sigBlob) throws IOException {
byte[] r = new BigInteger(1, Arrays.copyOfRange(sigBlob, 0, 20)).toByteArray();
byte[] s = new BigInteger(1, Arrays.copyOfRange(sigBlob, 20, 40)).toByteArray();
ASN1EncodableVector vector = new ASN1EncodableVector();
vector.add(new ASN1Integer(r));
vector.add(new ASN1Integer(s));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1OutputStream asnOS = new ASN1OutputStream(baos);
asnOS.writeObject(new DERSequence(vector));
asnOS.flush();
return baos.toByteArray();
}
}

24
src/main/java/net/schmizz/sshj/signature/SignatureECDSA.java
View File

@@ -98,7 +98,7 @@ public class SignatureECDSA extends AbstractSignature {
System.arraycopy(sig, 4, r, 0, rLen);
System.arraycopy(sig, 6 + rLen, s, 0, sLen);
Buffer buf = new Buffer.PlainBuffer();
Buffer.PlainBuffer buf = new Buffer.PlainBuffer();
buf.putMPInt(new BigInteger(r));
buf.putMPInt(new BigInteger(s));
@@ -107,18 +107,9 @@ public class SignatureECDSA extends AbstractSignature {
@Override
public boolean verify(byte[] sig) {
byte[] r;
byte[] s;
try {
Buffer sigbuf = new Buffer.PlainBuffer(extractSig(sig, keyTypeName));
r = sigbuf.readBytes();
s = sigbuf.readBytes();
} catch (Exception e) {
throw new SSHRuntimeException(e);
}
try {
return signature.verify(asnEncode(r, s));
byte[] sigBlob = extractSig(sig, keyTypeName);
return signature.verify(asnEncode(sigBlob));
} catch (SignatureException e) {
throw new SSHRuntimeException(e);
} catch (IOException e) {
@@ -126,7 +117,14 @@ public class SignatureECDSA extends AbstractSignature {
}
}
private byte[] asnEncode(byte[] r, byte[] s) throws IOException {
/**
* Encodes the signature as a DER sequence (ASN.1 format).
*/
private byte[] asnEncode(byte[] sigBlob) throws IOException {
Buffer.PlainBuffer sigbuf = new Buffer.PlainBuffer(sigBlob);
byte[] r = sigbuf.readBytes();
byte[] s = sigbuf.readBytes();
ASN1EncodableVector vector = new ASN1EncodableVector();
vector.add(new ASN1Integer(r));
vector.add(new ASN1Integer(s));