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Add a few more ECKey functions that accept wrapper objects.

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This commit is contained in:
Mike Hearn 2013-04-26 16:41:03 +02:00
parent 8a63fbd075
commit 95e43566a6
1 changed files with 31 additions and 13 deletions
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44
core/src/main/java/com/google/bitcoin/core/ECKey.java
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@ -394,6 +394,28 @@ public class ECKey implements Serializable {
return new ECDSASignature(sigs[0], sigs[1]);
}
/**
* Verifies the given ECDSA signature against the message bytes using the public key bytes.
*
* @param data Hash of the data to verify.
* @param signature ASN.1 encoded signature.
* @param pub The public key bytes to use.
*/
public static boolean verify(byte[] data, ECDSASignature signature, byte[] pub) {
ECDSASigner signer = new ECDSASigner();
ECPublicKeyParameters params = new ECPublicKeyParameters(ecParams.getCurve().decodePoint(pub), ecParams);
signer.init(false, params);
try {
return signer.verifySignature(data, signature.r, signature.s);
} catch (NullPointerException e) {
// Bouncy Castle contains a bug that can cause NPEs given specially crafted signatures. Those signatures
// are inherently invalid/attack sigs so we just fail them here rather than crash the thread.
log.error("Caught NPE inside bouncy castle");
e.printStackTrace();
return false;
}
}
/**
* Verifies the given ASN.1 encoded ECDSA signature against a hash using the public key.
*
@ -402,9 +424,6 @@ public class ECKey implements Serializable {
* @param pub The public key bytes to use.
*/
public static boolean verify(byte[] data, byte[] signature, byte[] pub) {
ECDSASigner signer = new ECDSASigner();
ECPublicKeyParameters params = new ECPublicKeyParameters(ecParams.getCurve().decodePoint(pub), ecParams);
signer.init(false, params);
try {
ASN1InputStream decoder = new ASN1InputStream(signature);
DLSequence seq = (DLSequence) decoder.readObject();
@ -414,15 +433,7 @@ public class ECKey implements Serializable {
// OpenSSL deviates from the DER spec by interpreting these values as unsigned, though they should not be
// Thus, we always use the positive versions.
// See: http://r6.ca/blog/20111119T211504Z.html
try {
return signer.verifySignature(data, r.getPositiveValue(), s.getPositiveValue());
} catch (NullPointerException e) {
// Bouncy Castle contains a bug that can cause NPEs given specially crafted signatures. Those signatures
// are inherently invalid/attack sigs so we just fail them here rather than crash the thread.
log.error("Caught NPE inside bouncy castle");
e.printStackTrace();
return false;
}
return verify(data, new ECDSASignature(r.getPositiveValue(), s.getPositiveValue()), pub);
} catch (IOException e) {
throw new RuntimeException(e);
}
@ -435,7 +446,14 @@ public class ECKey implements Serializable {
* @param signature ASN.1 encoded signature.
*/
public boolean verify(byte[] data, byte[] signature) {
return ECKey.verify(data, signature, pub);
return ECKey.verify(data, signature, getPubKey());
}
/**
* Verifies the given R/S pair (signature) against a hash using the public key.
*/
public boolean verify(Sha256Hash sigHash, ECDSASignature signature) {
return ECKey.verify(sigHash.getBytes(), signature, getPubKey());
}
private static BigInteger extractPrivateKeyFromASN1(byte[] asn1privkey) {