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Fix transport encoding of nistp521 signatures #623

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merged 2 commits into from
Jul 28, 2020
Merged

Fix transport encoding of nistp521 signatures #623

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5fbbe35
Fix transport encoding of nistp521 signatures
fmeum Jul 28, 2020
f3d5f93
Merge branch 'master' into ecdsa_521_fix
FabianHenneke Jul 28, 2020
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22 changes: 9 additions & 13 deletions src/main/java/net/schmizz/sshj/signature/SignatureECDSA.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
*/
package net.schmizz.sshj.signature;

import com.hierynomus.asn1.encodingrules.der.DERDecoder;
import com.hierynomus.asn1.encodingrules.der.DEREncoder;
import com.hierynomus.asn1.types.ASN1Object;
import com.hierynomus.asn1.types.constructed.ASN1Sequence;
Expand All @@ -23,6 +24,7 @@
import net.schmizz.sshj.common.KeyType;
import net.schmizz.sshj.common.SSHRuntimeException;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
Expand Down Expand Up @@ -87,22 +89,16 @@ public SignatureECDSA(String algorithm, String keyTypeName) {

@Override
public byte[] encode(byte[] sig) {
int rIndex = 3;
int rLen = sig[rIndex++] & 0xff;
byte[] r = new byte[rLen];
System.arraycopy(sig, rIndex, r, 0, r.length);
ByteArrayInputStream bais = new ByteArrayInputStream(sig);
com.hierynomus.asn1.ASN1InputStream asn1InputStream = new com.hierynomus.asn1.ASN1InputStream(new DERDecoder(), bais);

int sIndex = rIndex + rLen + 1;
int sLen = sig[sIndex++] & 0xff;
byte[] s = new byte[sLen];
System.arraycopy(sig, sIndex, s, 0, s.length);

System.arraycopy(sig, 4, r, 0, rLen);
System.arraycopy(sig, 6 + rLen, s, 0, sLen);
ASN1Sequence sequence = asn1InputStream.readObject();
ASN1Integer r = (ASN1Integer) sequence.get(0);
ASN1Integer s = (ASN1Integer) sequence.get(1);

Buffer.PlainBuffer buf = new Buffer.PlainBuffer();
buf.putMPInt(new BigInteger(r));
buf.putMPInt(new BigInteger(s));
buf.putMPInt(r.getValue());
buf.putMPInt(s.getValue());

return buf.getCompactData();
}
Expand Down