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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.jcajce.provider.asymmetric.dsa;
import java.math.BigInteger;
import java.security.AlgorithmParameters;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.security.SignatureSpi;
import java.security.spec.AlgorithmParameterSpec;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DSAExt;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.NullDigest;
import org.bouncycastle.crypto.digests.RIPEMD160Digest;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.DSAEncoding;
import org.bouncycastle.crypto.signers.HMacDSAKCalculator;
import org.bouncycastle.crypto.signers.StandardDSAEncoding;
import org.bouncycastle.crypto.util.DigestFactory;
public class DSASigner
extends SignatureSpi
implements PKCSObjectIdentifiers, X509ObjectIdentifiers
{
private Digest digest;
private DSAExt signer;
private DSAEncoding encoding = StandardDSAEncoding.INSTANCE;
private SecureRandom random;
protected DSASigner(
Digest digest,
DSAExt signer)
{
this.digest = digest;
this.signer = signer;
}
protected void engineInitVerify(
PublicKey publicKey)
throws InvalidKeyException
{
CipherParameters param = DSAUtil.generatePublicKeyParameter(publicKey);
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 = DSAUtil.generatePrivateKeyParameter(privateKey);
if (random != null)
{
param = new ParametersWithRandom(param, random);
}
digest.reset();
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 encoding.encode(signer.getOrder(), 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 = encoding.decode(signer.getOrder(), sigBytes);
}
catch (Exception e)
{
throw new SignatureException("error decoding signature bytes.");
}
return signer.verifySignature(hash, sig[0], sig[1]);
}
protected AlgorithmParameters engineGetParameters()
{
return null;
}
protected void engineSetParameter(
AlgorithmParameterSpec params)
{
throw new UnsupportedOperationException("engineSetParameter unsupported");
}
/**
* @deprecated replaced with #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("engineGetParameter unsupported");
}
static public class stdDSA
extends DSASigner
{
public stdDSA()
{
super(DigestFactory.createSHA1(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSA
extends DSASigner
{
public detDSA()
{
super(DigestFactory.createSHA1(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA1())));
}
}
static public class dsaRMD160
extends DSASigner
{
public dsaRMD160()
{
super(new RIPEMD160Digest(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class dsa224
extends DSASigner
{
public dsa224()
{
super(DigestFactory.createSHA224(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSA224
extends DSASigner
{
public detDSA224()
{
super(DigestFactory.createSHA224(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA224())));
}
}
static public class dsa256
extends DSASigner
{
public dsa256()
{
super(DigestFactory.createSHA256(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSA256
extends DSASigner
{
public detDSA256()
{
super(DigestFactory.createSHA256(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA256())));
}
}
static public class dsa384
extends DSASigner
{
public dsa384()
{
super(DigestFactory.createSHA384(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSA384
extends DSASigner
{
public detDSA384()
{
super(DigestFactory.createSHA384(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA384())));
}
}
static public class dsa512
extends DSASigner
{
public dsa512()
{
super(DigestFactory.createSHA512(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSA512
extends DSASigner
{
public detDSA512()
{
super(DigestFactory.createSHA512(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA512())));
}
}
static public class dsaSha3_224
extends DSASigner
{
public dsaSha3_224()
{
super(DigestFactory.createSHA3_224(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSASha3_224
extends DSASigner
{
public detDSASha3_224()
{
super(DigestFactory.createSHA3_224(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA3_224())));
}
}
static public class dsaSha3_256
extends DSASigner
{
public dsaSha3_256()
{
super(DigestFactory.createSHA3_256(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSASha3_256
extends DSASigner
{
public detDSASha3_256()
{
super(DigestFactory.createSHA3_256(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA3_256())));
}
}
static public class dsaSha3_384
extends DSASigner
{
public dsaSha3_384()
{
super(DigestFactory.createSHA3_384(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSASha3_384
extends DSASigner
{
public detDSASha3_384()
{
super(DigestFactory.createSHA3_384(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA3_384())));
}
}
static public class dsaSha3_512
extends DSASigner
{
public dsaSha3_512()
{
super(DigestFactory.createSHA3_512(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
static public class detDSASha3_512
extends DSASigner
{
public detDSASha3_512()
{
super(DigestFactory.createSHA3_512(), new org.bouncycastle.crypto.signers.DSASigner(new HMacDSAKCalculator(DigestFactory.createSHA3_512())));
}
}
static public class noneDSA
extends DSASigner
{
public noneDSA()
{
super(new NullDigest(), new org.bouncycastle.crypto.signers.DSASigner());
}
}
}