package org.bouncycastle.jce.provider;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.interfaces.DSAKey;
import java.security.spec.AlgorithmParameterSpec;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERInputStream;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
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.SHA1Digest;
import org.bouncycastle.crypto.params.ParametersWithRandom;
//import org.bouncycastle.crypto.signers.DSASigner;
import org.bouncycastle.crypto.signers.ECDSASigner;
import org.bouncycastle.jce.interfaces.ECKey;
public class JDKDSASigner
extends Signature implements PKCSObjectIdentifiers, X509ObjectIdentifiers
{
private Digest digest;
private DSA signer;
private SecureRandom random;
protected JDKDSASigner(
String name,
Digest digest,
DSA signer)
{
super(name);
this.digest = digest;
this.signer = signer;
}
protected void engineInitVerify(
PublicKey publicKey)
throws InvalidKeyException
{
CipherParameters param = null;
if (publicKey instanceof ECKey)
{
param = ECUtil.generatePublicKeyParameter(publicKey);
}
else if (publicKey instanceof DSAKey)
{
param = DSAUtil.generatePublicKeyParameter(publicKey);
}
else
{
try
{
/*
byte[] bytes = publicKey.getEncoded();
publicKey = JDKKeyFactory.createPublicKeyFromDERStream(
new ByteArrayInputStream(bytes));
if (publicKey instanceof ECKey)
{
param = ECUtil.generatePublicKeyParameter(publicKey);
}
else if (publicKey instanceof DSAKey)
{
param = DSAUtil.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 = null;
if (privateKey instanceof ECKey)
{
param = ECUtil.generatePrivateKeyParameter(privateKey);
}
else
{
param = DSAUtil.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
{
BigInteger[] sig = signer.generateSignature(hash);
return derEncode(sig[0], sig[1]);
}
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
{
sig = derDecode(sigBytes);
}
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");
}
private byte[] derEncode(
BigInteger r,
BigInteger s)
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
DEROutputStream dOut = new DEROutputStream(bOut);
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(r));
v.add(new DERInteger(s));
dOut.writeObject(new DERSequence(v));
return bOut.toByteArray();
}
private BigInteger[] derDecode(
byte[] encoding)
throws IOException
{
ByteArrayInputStream bIn = new ByteArrayInputStream(encoding);
DERInputStream dIn = new DERInputStream(bIn);
ASN1Sequence s = (ASN1Sequence)dIn.readObject();
BigInteger[] sig = new BigInteger[2];
sig[0] = ((DERInteger)s.getObjectAt(0)).getValue();
sig[1] = ((DERInteger)s.getObjectAt(1)).getValue();
return sig;
}
/*
static public class stdDSA
extends JDKDSASigner
{
public stdDSA()
{
super("SHA1withDSA", new SHA1Digest(), new DSASigner());
}
}
*/
static public class ecDSA
extends JDKDSASigner
{
public ecDSA()
{
super("SHA1withECDSA", new SHA1Digest(), new ECDSASigner());
}
}
}