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package org.bouncycastle.crypto.tls;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.DSA;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.digests.NullDigest;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.DSADigestSigner;
public abstract class TlsDSASigner
extends AbstractTlsSigner
{
public byte[] generateRawSignature(SignatureAndHashAlgorithm algorithm,
AsymmetricKeyParameter privateKey, byte[] hash)
throws CryptoException
{
Signer signer = makeSigner(algorithm, true, true,
new ParametersWithRandom(privateKey, this.context.getSecureRandom()));
if (algorithm == null)
{
// Note: Only use the SHA1 part of the (MD5/SHA1) hash
signer.update(hash, 16, 20);
}
else
{
signer.update(hash, 0, hash.length);
}
return signer.generateSignature();
}
public boolean verifyRawSignature(SignatureAndHashAlgorithm algorithm, byte[] sigBytes,
AsymmetricKeyParameter publicKey, byte[] hash)
throws CryptoException
{
Signer signer = makeSigner(algorithm, true, false, publicKey);
if (algorithm == null)
{
// Note: Only use the SHA1 part of the (MD5/SHA1) hash
signer.update(hash, 16, 20);
}
else
{
signer.update(hash, 0, hash.length);
}
return signer.verifySignature(sigBytes);
}
public Signer createSigner(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey)
{
return makeSigner(algorithm, false, true, privateKey);
}
public Signer createVerifyer(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter publicKey)
{
return makeSigner(algorithm, false, false, publicKey);
}
protected CipherParameters makeInitParameters(boolean forSigning, CipherParameters cp)
{
return cp;
}
protected Signer makeSigner(SignatureAndHashAlgorithm algorithm, boolean raw, boolean forSigning,
CipherParameters cp)
{
if ((algorithm != null) != TlsUtils.isTLSv12(context))
{
throw new IllegalStateException();
}
if (algorithm != null && algorithm.getSignature() != getSignatureAlgorithm())
{
throw new IllegalStateException();
}
short hashAlgorithm = algorithm == null ? HashAlgorithm.sha1 : algorithm.getHash();
Digest d = raw ? new NullDigest() : TlsUtils.createHash(hashAlgorithm);
Signer s = new DSADigestSigner(createDSAImpl(hashAlgorithm), d);
s.init(forSigning, makeInitParameters(forSigning, cp));
return s;
}
protected abstract short getSignatureAlgorithm();
protected abstract DSA createDSAImpl(short hashAlgorithm);
}
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