Ed25519Signer
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math.EC.Rfc8032;
using System;
using System.IO;
namespace Org.BouncyCastle.Crypto.Signers
{
public class Ed25519Signer : ISigner
{
private sealed class Buffer : MemoryStream
{
internal byte[] GenerateSignature(Ed25519PrivateKeyParameters privateKey)
{
lock (this) {
byte[] buffer = GetBuffer();
int msgLen = Convert.ToInt32(Length);
byte[] array = new byte[Ed25519PrivateKeyParameters.SignatureSize];
privateKey.Sign(Ed25519.Algorithm.Ed25519, null, buffer, 0, msgLen, array, 0);
Reset();
return array;
}
}
internal bool VerifySignature(Ed25519PublicKeyParameters publicKey, byte[] signature)
{
if (Ed25519.SignatureSize != signature.Length) {
Reset();
return false;
}
lock (this) {
byte[] buffer = GetBuffer();
int msgLen = Convert.ToInt32(Length);
bool result = publicKey.Verify(Ed25519.Algorithm.Ed25519, null, buffer, 0, msgLen, signature, 0);
Reset();
return result;
}
}
internal void Reset()
{
lock (this) {
int length = Convert.ToInt32(Length);
Array.Clear(GetBuffer(), 0, length);
SetLength(0);
}
}
}
private readonly Buffer buffer = new Buffer();
private bool forSigning;
private Ed25519PrivateKeyParameters privateKey;
private Ed25519PublicKeyParameters publicKey;
public virtual string AlgorithmName => "Ed25519";
public virtual void Init(bool forSigning, ICipherParameters parameters)
{
this.forSigning = forSigning;
if (forSigning) {
privateKey = (Ed25519PrivateKeyParameters)parameters;
publicKey = null;
} else {
privateKey = null;
publicKey = (Ed25519PublicKeyParameters)parameters;
}
Reset();
}
public virtual void Update(byte b)
{
buffer.WriteByte(b);
}
public virtual void BlockUpdate(byte[] buf, int off, int len)
{
buffer.Write(buf, off, len);
}
public virtual int GetMaxSignatureSize()
{
return Ed25519.SignatureSize;
}
public virtual byte[] GenerateSignature()
{
if (!forSigning || privateKey == null)
throw new InvalidOperationException("Ed25519Signer not initialised for signature generation.");
return buffer.GenerateSignature(privateKey);
}
public virtual bool VerifySignature(byte[] signature)
{
if (forSigning || publicKey == null)
throw new InvalidOperationException("Ed25519Signer not initialised for verification");
return buffer.VerifySignature(publicKey, signature);
}
public virtual void Reset()
{
buffer.Reset();
}
}
}