112 lines
2.6 KiB
C#
112 lines
2.6 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Security;
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namespace Org.BouncyCastle.Crypto.Signers;
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public class DsaDigestSigner : ISigner
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{
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private readonly IDsa dsa;
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private readonly IDigest digest;
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private readonly IDsaEncoding encoding;
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private bool forSigning;
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public virtual string AlgorithmName => digest.AlgorithmName + "with" + dsa.AlgorithmName;
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public DsaDigestSigner(IDsa dsa, IDigest digest)
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{
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this.dsa = dsa;
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this.digest = digest;
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encoding = StandardDsaEncoding.Instance;
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}
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public DsaDigestSigner(IDsaExt dsa, IDigest digest, IDsaEncoding encoding)
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{
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this.dsa = dsa;
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this.digest = digest;
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this.encoding = encoding;
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}
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public virtual void Init(bool forSigning, ICipherParameters parameters)
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{
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this.forSigning = forSigning;
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AsymmetricKeyParameter asymmetricKeyParameter = ((!(parameters is ParametersWithRandom)) ? ((AsymmetricKeyParameter)parameters) : ((AsymmetricKeyParameter)((ParametersWithRandom)parameters).Parameters));
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if (forSigning && !asymmetricKeyParameter.IsPrivate)
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{
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throw new InvalidKeyException("Signing Requires Private Key.");
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}
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if (!forSigning && asymmetricKeyParameter.IsPrivate)
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{
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throw new InvalidKeyException("Verification Requires Public Key.");
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}
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Reset();
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dsa.Init(forSigning, parameters);
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}
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public virtual void Update(byte input)
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{
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digest.Update(input);
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}
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public virtual void BlockUpdate(byte[] input, int inOff, int length)
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{
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digest.BlockUpdate(input, inOff, length);
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}
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public virtual byte[] GenerateSignature()
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{
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if (!forSigning)
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{
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throw new InvalidOperationException("DSADigestSigner not initialised for signature generation.");
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}
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byte[] array = new byte[digest.GetDigestSize()];
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digest.DoFinal(array, 0);
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BigInteger[] array2 = dsa.GenerateSignature(array);
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try
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{
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return encoding.Encode(GetOrder(), array2[0], array2[1]);
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}
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catch (Exception)
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{
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throw new InvalidOperationException("unable to encode signature");
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}
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}
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public virtual bool VerifySignature(byte[] signature)
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{
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if (forSigning)
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{
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throw new InvalidOperationException("DSADigestSigner not initialised for verification");
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}
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byte[] array = new byte[digest.GetDigestSize()];
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digest.DoFinal(array, 0);
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try
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{
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BigInteger[] array2 = encoding.Decode(GetOrder(), signature);
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return dsa.VerifySignature(array, array2[0], array2[1]);
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}
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catch (Exception)
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{
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return false;
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}
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}
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public virtual void Reset()
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{
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digest.Reset();
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}
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protected virtual BigInteger GetOrder()
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{
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if (!(dsa is IDsaExt))
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{
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return null;
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}
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return ((IDsaExt)dsa).Order;
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}
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}
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