74 lines
2.3 KiB
C#
74 lines
2.3 KiB
C#
using System;
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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.Crypto.Tls;
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public abstract class TlsDsaSigner : AbstractTlsSigner
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{
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protected abstract byte SignatureAlgorithm { get; }
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public override byte[] GenerateRawSignature(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey, byte[] hash)
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{
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ISigner signer = MakeSigner(algorithm, raw: true, forSigning: true, new ParametersWithRandom(privateKey, mContext.SecureRandom));
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if (algorithm == null)
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{
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signer.BlockUpdate(hash, 16, 20);
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}
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else
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{
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signer.BlockUpdate(hash, 0, hash.Length);
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}
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return signer.GenerateSignature();
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}
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public override bool VerifyRawSignature(SignatureAndHashAlgorithm algorithm, byte[] sigBytes, AsymmetricKeyParameter publicKey, byte[] hash)
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{
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ISigner signer = MakeSigner(algorithm, raw: true, forSigning: false, publicKey);
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if (algorithm == null)
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{
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signer.BlockUpdate(hash, 16, 20);
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}
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else
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{
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signer.BlockUpdate(hash, 0, hash.Length);
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}
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return signer.VerifySignature(sigBytes);
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}
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public override ISigner CreateSigner(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey)
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{
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return MakeSigner(algorithm, raw: false, forSigning: true, privateKey);
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}
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public override ISigner CreateVerifyer(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter publicKey)
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{
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return MakeSigner(algorithm, raw: false, forSigning: false, publicKey);
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}
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protected virtual ICipherParameters MakeInitParameters(bool forSigning, ICipherParameters cp)
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{
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return cp;
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}
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protected virtual ISigner MakeSigner(SignatureAndHashAlgorithm algorithm, bool raw, bool forSigning, ICipherParameters cp)
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{
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if (algorithm != null != TlsUtilities.IsTlsV12(mContext))
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{
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throw new InvalidOperationException();
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}
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if (algorithm != null && algorithm.Signature != SignatureAlgorithm)
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{
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throw new InvalidOperationException();
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}
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byte hashAlgorithm = algorithm?.Hash ?? 2;
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IDigest digest = (raw ? new NullDigest() : TlsUtilities.CreateHash(hashAlgorithm));
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ISigner signer = new DsaDigestSigner(CreateDsaImpl(hashAlgorithm), digest);
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signer.Init(forSigning, MakeInitParameters(forSigning, cp));
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return signer;
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}
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protected abstract IDsa CreateDsaImpl(byte hashAlgorithm);
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}
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