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42 lines
1.6 KiB
42 lines
1.6 KiB
2 months ago
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using System;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Digests;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Crypto.Signers;
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namespace Org.BouncyCastle.Tls.Crypto.Impl.BC
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{
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/// <summary>Implementation class for verification of ECDSA signatures in TLS 1.3+ using the BC light-weight API.
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/// </summary>
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public class BcTlsECDsa13Verifier
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: BcTlsVerifier
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{
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private readonly int m_signatureScheme;
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public BcTlsECDsa13Verifier(BcTlsCrypto crypto, ECPublicKeyParameters publicKey, int signatureScheme)
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: base(crypto, publicKey)
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{
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if (!SignatureScheme.IsECDsa(signatureScheme))
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throw new ArgumentException("signatureScheme");
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this.m_signatureScheme = signatureScheme;
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}
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public override bool VerifyRawSignature(DigitallySigned signature, byte[] hash)
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{
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SignatureAndHashAlgorithm algorithm = signature.Algorithm;
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if (algorithm == null || SignatureScheme.From(algorithm) != m_signatureScheme)
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throw new InvalidOperationException("Invalid algorithm: " + algorithm);
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int cryptoHashAlgorithm = SignatureScheme.GetCryptoHashAlgorithm(m_signatureScheme);
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IDsa dsa = new ECDsaSigner(new HMacDsaKCalculator(m_crypto.CreateDigest(cryptoHashAlgorithm)));
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ISigner signer = new DsaDigestSigner(dsa, new NullDigest());
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signer.Init(false, m_publicKey);
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signer.BlockUpdate(hash, 0, hash.Length);
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return signer.VerifySignature(signature.Signature);
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}
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}
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}
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