Ed448phSigner
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math.EC.Rfc8032;
using System;
namespace Org.BouncyCastle.Crypto.Signers
{
public class Ed448phSigner : ISigner
{
private readonly IXof prehash = Ed448.CreatePrehash();
private readonly byte[] context;
private bool forSigning;
private Ed448PrivateKeyParameters privateKey;
private Ed448PublicKeyParameters publicKey;
public virtual string AlgorithmName => "Ed448ph";
public Ed448phSigner(byte[] context)
{
if (context == null)
throw new ArgumentNullException("context");
this.context = (byte[])context.Clone();
}
public virtual void Init(bool forSigning, ICipherParameters parameters)
{
this.forSigning = forSigning;
if (forSigning) {
privateKey = (Ed448PrivateKeyParameters)parameters;
publicKey = null;
} else {
privateKey = null;
publicKey = (Ed448PublicKeyParameters)parameters;
}
Reset();
}
public virtual void Update(byte b)
{
prehash.Update(b);
}
public virtual void BlockUpdate(byte[] buf, int off, int len)
{
prehash.BlockUpdate(buf, off, len);
}
public virtual int GetMaxSignatureSize()
{
return Ed448.SignatureSize;
}
public virtual byte[] GenerateSignature()
{
if (!forSigning || privateKey == null)
throw new InvalidOperationException("Ed448phSigner not initialised for signature generation.");
byte[] array = new byte[Ed448.PrehashSize];
if (Ed448.PrehashSize != prehash.OutputFinal(array, 0, Ed448.PrehashSize))
throw new InvalidOperationException("Prehash calculation failed");
byte[] array2 = new byte[Ed448PrivateKeyParameters.SignatureSize];
privateKey.Sign(Ed448.Algorithm.Ed448ph, context, array, 0, Ed448.PrehashSize, array2, 0);
return array2;
}
public virtual bool VerifySignature(byte[] signature)
{
if (forSigning || publicKey == null)
throw new InvalidOperationException("Ed448phSigner not initialised for verification");
if (Ed448.SignatureSize != signature.Length) {
prehash.Reset();
return false;
}
byte[] array = new byte[Ed448.PrehashSize];
if (Ed448.PrehashSize != prehash.OutputFinal(array, 0, Ed448.PrehashSize))
throw new InvalidOperationException("Prehash calculation failed");
return publicKey.Verify(Ed448.Algorithm.Ed448ph, context, array, 0, Ed448.PrehashSize, signature, 0);
}
public void Reset()
{
prehash.Reset();
}
}
}