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package org.bouncycastle.jcajce.provider.asymmetric.gost;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.security.spec.AlgorithmParameterSpec;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.GOST3411Digest;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.GOST3410Signer;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jce.interfaces.ECKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.interfaces.GOST3410Key;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jcajce.provider.asymmetric.util.GOST3410Util;
public class SignatureSpi
extends java.security.Signature
implements PKCSObjectIdentifiers, X509ObjectIdentifiers
{
private Digest digest;
private DSA signer;
private SecureRandom random;
public SignatureSpi()
{
super("GOST3410");
this.digest = new GOST3411Digest();
this.signer = new GOST3410Signer();
}
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,
SecureRandom random)
throws InvalidKeyException
{
this.random = random;
engineInitSign(privateKey);
}
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 void engineUpdate(
byte b)
throws SignatureException
{
digest.update(b);
}
protected void engineUpdate(
byte[] b,
int off,
int len)
throws SignatureException
{
digest.update(b, off, len);
}
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 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]);
}
protected void engineSetParameter(
AlgorithmParameterSpec params)
{
throw new UnsupportedOperationException("engineSetParameter unsupported");
}
/**
* @deprecated replaced with <a href = "#engineSetParameter(java.security.spec.AlgorithmParameterSpec)">
*/
protected void engineSetParameter(
String param,
Object value)
{
throw new UnsupportedOperationException("engineSetParameter unsupported");
}
/**
* @deprecated
*/
protected Object engineGetParameter(
String param)
{
throw new UnsupportedOperationException("engineSetParameter unsupported");
}
}
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