protected byte[] engineSign() throws SignatureException {
byte[] hash = new byte[digest.getDigestSize()];
digest.doFinal(hash, 0);
try {
byte[] sigBytes = new byte[64];
BigInteger[] sig = signer.generateSignature(hash);
byte[] r = sig[0].toByteArray();
byte[] s = sig[1].toByteArray();
if (s[0] != 0) {
System.arraycopy(s, 0, sigBytes, 32 - s.length, s.length);
} else {
System.arraycopy(s, 1, sigBytes, 32 - (s.length - 1), s.length - 1);
}
if (r[0] != 0) {
System.arraycopy(r, 0, sigBytes, 64 - r.length, r.length);
} else {
System.arraycopy(r, 1, sigBytes, 64 - (r.length - 1), r.length - 1);
}
return sigBytes;
} catch (Exception e) {
throw new SignatureException(e.toString());
}
}
protected void engineInitVerify(PublicKey publicKey) throws InvalidKeyException {
CipherParameters param;
if (publicKey instanceof ECPublicKey) {
param = ECUtil.generatePublicKeyParameter(publicKey);
} else if (publicKey instanceof GOST3410Key) {
param = GOST3410Util.generatePublicKeyParameter(publicKey);
} else {
try {
byte[] bytes = publicKey.getEncoded();
publicKey = BouncyCastleProvider.getPublicKey(SubjectPublicKeyInfo.getInstance(bytes));
if (publicKey instanceof ECPublicKey) {
param = ECUtil.generatePublicKeyParameter(publicKey);
} else {
throw new InvalidKeyException("can't recognise key type in DSA based signer");
}
} catch (Exception e) {
throw new InvalidKeyException("can't recognise key type in DSA based signer");
}
}
digest.reset();
signer.init(false, param);
}
protected void engineInitSign(PrivateKey privateKey) throws InvalidKeyException {
CipherParameters param;
if (privateKey instanceof ECKey) {
param = ECUtil.generatePrivateKeyParameter(privateKey);
} else {
param = GOST3410Util.generatePrivateKeyParameter(privateKey);
}
digest.reset();
if (random != null) {
signer.init(true, new ParametersWithRandom(param, random));
} else {
signer.init(true, param);
}
}
protected boolean engineVerify(byte[] sigBytes) throws SignatureException {
byte[] hash = new byte[digest.getDigestSize()];
digest.doFinal(hash, 0);
BigInteger[] sig;
try {
byte[] r = new byte[32];
byte[] s = new byte[32];
System.arraycopy(sigBytes, 0, s, 0, 32);
System.arraycopy(sigBytes, 32, r, 0, 32);
sig = new BigInteger[2];
sig[0] = new BigInteger(1, r);
sig[1] = new BigInteger(1, s);
} catch (Exception e) {
throw new SignatureException("error decoding signature bytes.");
}
return signer.verifySignature(hash, sig[0], sig[1]);
}
