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72 lines
2.5 KiB
72 lines
2.5 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 generation of RSASSA-PKCS1-v1_5 signatures using the BC light-weight API.
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/// </summary>
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public class BcTlsRsaSigner
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: BcTlsSigner
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{
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private readonly RsaKeyParameters m_publicKey;
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public BcTlsRsaSigner(BcTlsCrypto crypto, RsaKeyParameters privateKey, RsaKeyParameters publicKey)
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: base(crypto, privateKey)
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{
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this.m_publicKey = publicKey;
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}
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public override byte[] GenerateRawSignature(SignatureAndHashAlgorithm algorithm, byte[] hash)
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{
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IDigest nullDigest = new NullDigest();
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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(true, new ParametersWithRandom(m_privateKey, m_crypto.SecureRandom));
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signer.BlockUpdate(hash, 0, hash.Length);
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try
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{
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byte[] signature = signer.GenerateSignature();
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signer.Init(false, m_publicKey);
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signer.BlockUpdate(hash, 0, hash.Length);
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if (signer.VerifySignature(signature))
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{
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return signature;
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}
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}
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catch (CryptoException e)
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{
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throw new TlsFatalAlert(AlertDescription.internal_error, e);
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}
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throw new TlsFatalAlert(AlertDescription.internal_error);
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}
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}
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}
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