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package org.spongycastle.jcajce.provider.asymmetric.util;
import java.math.BigInteger;
import java.security.SignatureException;
import java.security.SignatureSpi;
import java.security.spec.AlgorithmParameterSpec;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.x509.X509ObjectIdentifiers;
import org.spongycastle.crypto.DSA;
import org.spongycastle.crypto.Digest;
public abstract class DSABase
extends SignatureSpi
implements PKCSObjectIdentifiers, X509ObjectIdentifiers
{
protected Digest digest;
protected DSA signer;
protected DSAEncoder encoder;
protected DSABase(
Digest digest,
DSA signer,
DSAEncoder encoder)
{
this.digest = digest;
this.signer = signer;
this.encoder = encoder;
}
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 encoder.encode(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 = encoder.decode(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");
}
}
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