BcTlsECDsa13Signer
Implementation class for generation of ECDSA signatures in TLS 1.3+ using the BC light-weight API.
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using System;
namespace Org.BouncyCastle.Tls.Crypto.Impl.BC
{
public class BcTlsECDsa13Signer : BcTlsSigner
{
private readonly int m_signatureScheme;
public BcTlsECDsa13Signer(BcTlsCrypto crypto, ECPrivateKeyParameters privateKey, int signatureScheme)
: base(crypto, privateKey)
{
if (!SignatureScheme.IsECDsa(signatureScheme))
throw new ArgumentException("signatureScheme");
m_signatureScheme = signatureScheme;
}
public override byte[] GenerateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash)
{
if (algorithm != null && SignatureScheme.From(algorithm) == m_signatureScheme) {
int cryptoHashAlgorithm = SignatureScheme.GetCryptoHashAlgorithm(m_signatureScheme);
ISigner signer = new DsaDigestSigner(new ECDsaSigner(new HMacDsaKCalculator(m_crypto.CreateDigest(cryptoHashAlgorithm))), new NullDigest());
signer.Init(true, new ParametersWithRandom(m_privateKey, m_crypto.SecureRandom));
signer.BlockUpdate(hash, 0, hash.Length);
try {
return signer.GenerateSignature();
} catch (CryptoException alertCause) {
throw new TlsFatalAlert(80, alertCause);
}
}
throw new InvalidOperationException("Invalid algorithm: " + algorithm?.ToString());
}
}
}