84 lines
2.0 KiB
C#
84 lines
2.0 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math.EC.Rfc8032;
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using Org.BouncyCastle.Utilities;
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namespace Org.BouncyCastle.Crypto.Signers;
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public class Ed448phSigner : ISigner
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{
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private readonly IXof prehash = Ed448.CreatePrehash();
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private readonly byte[] context;
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private bool forSigning;
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private Ed448PrivateKeyParameters privateKey;
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private Ed448PublicKeyParameters publicKey;
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public virtual string AlgorithmName => "Ed448ph";
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public Ed448phSigner(byte[] context)
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{
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this.context = Arrays.Clone(context);
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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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if (forSigning)
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{
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privateKey = (Ed448PrivateKeyParameters)parameters;
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publicKey = privateKey.GeneratePublicKey();
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}
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else
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{
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privateKey = null;
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publicKey = (Ed448PublicKeyParameters)parameters;
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}
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Reset();
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}
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public virtual void Update(byte b)
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{
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prehash.Update(b);
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}
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public virtual void BlockUpdate(byte[] buf, int off, int len)
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{
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prehash.BlockUpdate(buf, off, len);
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}
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public virtual byte[] GenerateSignature()
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{
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if (!forSigning || privateKey == null)
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{
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throw new InvalidOperationException("Ed448phSigner not initialised for signature generation.");
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}
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byte[] array = new byte[Ed448.PrehashSize];
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if (Ed448.PrehashSize != prehash.DoFinal(array, 0, Ed448.PrehashSize))
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{
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throw new InvalidOperationException("Prehash digest failed");
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}
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byte[] array2 = new byte[Ed448PrivateKeyParameters.SignatureSize];
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privateKey.Sign(Ed448.Algorithm.Ed448ph, publicKey, context, array, 0, Ed448.PrehashSize, array2, 0);
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return array2;
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}
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public virtual bool VerifySignature(byte[] signature)
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{
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if (forSigning || publicKey == null)
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{
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throw new InvalidOperationException("Ed448phSigner not initialised for verification");
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}
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byte[] encoded = publicKey.GetEncoded();
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return Ed448.VerifyPrehash(signature, 0, encoded, 0, context, prehash);
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}
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public void Reset()
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{
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prehash.Reset();
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}
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}
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