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using System;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Tls
{
internal abstract class TlsDsaSigner
: TlsSigner
{
public virtual byte[] CalculateRawSignature(SecureRandom random,
AsymmetricKeyParameter privateKey, byte[] md5andsha1)
{
ISigner s = MakeSigner(new NullDigest(), true, new ParametersWithRandom(privateKey, random));
// Note: Only use the SHA1 part of the hash
s.BlockUpdate(md5andsha1, 16, 20);
return s.GenerateSignature();
}
public bool VerifyRawSignature(byte[] sigBytes, AsymmetricKeyParameter publicKey, byte[] md5andsha1)
{
ISigner s = MakeSigner(new NullDigest(), false, publicKey);
// Note: Only use the SHA1 part of the hash
s.BlockUpdate(md5andsha1, 16, 20);
return s.VerifySignature(sigBytes);
}
public virtual ISigner CreateSigner(SecureRandom random, AsymmetricKeyParameter privateKey)
{
return MakeSigner(new Sha1Digest(), true, new ParametersWithRandom(privateKey, random));
}
public virtual ISigner CreateVerifyer(AsymmetricKeyParameter publicKey)
{
return MakeSigner(new Sha1Digest(), false, publicKey);
}
public abstract bool IsValidPublicKey(AsymmetricKeyParameter publicKey);
protected virtual ISigner MakeSigner(IDigest d, bool forSigning, ICipherParameters cp)
{
ISigner s = new DsaDigestSigner(CreateDsaImpl(), d);
s.Init(forSigning, cp);
return s;
}
protected abstract IDsa CreateDsaImpl();
}
}
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