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53 lines
1.9 KiB
53 lines
1.9 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.Encodings;
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using Org.BouncyCastle.Crypto.Engines;
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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>Operator supporting the verification of RSASSA-PKCS1-v1_5 signatures using the BC light-weight API.
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/// </summary>
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public class BcTlsRsaVerifier
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: BcTlsVerifier
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{
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public BcTlsRsaVerifier(BcTlsCrypto crypto, RsaKeyParameters publicKey)
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: base(crypto, publicKey)
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{
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}
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public override bool VerifyRawSignature(DigitallySigned signedParams, byte[] hash)
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{
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IDigest nullDigest = new NullDigest();
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SignatureAndHashAlgorithm algorithm = signedParams.Algorithm;
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ISigner signer;
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if (algorithm != null)
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{
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if (algorithm.Signature != SignatureAlgorithm.rsa)
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throw new InvalidOperationException("Invalid algorithm: " + algorithm);
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/*
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* RFC 5246 4.7. In RSA signing, the opaque vector contains the signature generated
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* using the RSASSA-PKCS1-v1_5 signature scheme defined in [PKCS1].
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*/
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signer = new RsaDigestSigner(nullDigest, TlsUtilities.GetOidForHashAlgorithm(algorithm.Hash));
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}
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else
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{
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/*
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* RFC 5246 4.7. Note that earlier versions of TLS used a different RSA signature scheme
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* that did not include a DigestInfo encoding.
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*/
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signer = new GenericSigner(new Pkcs1Encoding(new RsaBlindedEngine()), nullDigest);
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}
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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(signedParams.Signature);
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}
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}
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}
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