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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
namespace Org.BouncyCastle.Tls.Crypto.Impl.BC
{
/// <summary>Operator supporting the generation of RSASSA-PSS signatures using the BC light-weight API.</summary>
public class BcTlsRsaPssSigner
: BcTlsSigner
{
private readonly int m_signatureScheme;
public BcTlsRsaPssSigner(BcTlsCrypto crypto, RsaKeyParameters privateKey, int signatureScheme)
: base(crypto, privateKey)
{
if (!SignatureScheme.IsRsaPss(signatureScheme))
throw new ArgumentException("signatureScheme");
this.m_signatureScheme = signatureScheme;
}
public override byte[] GenerateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash)
{
if (algorithm == null || SignatureScheme.From(algorithm) != m_signatureScheme)
throw new InvalidOperationException("Invalid algorithm: " + algorithm);
int cryptoHashAlgorithm = SignatureScheme.GetCryptoHashAlgorithm(m_signatureScheme);
IDigest digest = m_crypto.CreateDigest(cryptoHashAlgorithm);
PssSigner signer = PssSigner.CreateRawSigner(new RsaBlindedEngine(), digest);
signer.Init(true, new ParametersWithRandom(m_privateKey, m_crypto.SecureRandom));
signer.BlockUpdate(hash, 0, hash.Length);
try
{
return signer.GenerateSignature();
}
catch (CryptoException e)
{
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
}
}
}
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