init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Signers/Ed25519Signer.cs

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+using System;
+using System.IO;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Math.EC.Rfc8032;
+
+namespace Org.BouncyCastle.Crypto.Signers;
+
+public class Ed25519Signer : ISigner
+{
+	private class Buffer : MemoryStream
+	{
+		internal byte[] GenerateSignature(Ed25519PrivateKeyParameters privateKey, Ed25519PublicKeyParameters publicKey)
+		{
+			lock (this)
+			{
+				byte[] buffer = GetBuffer();
+				int msgLen = (int)Position;
+				byte[] array = new byte[Ed25519PrivateKeyParameters.SignatureSize];
+				privateKey.Sign(Ed25519.Algorithm.Ed25519, publicKey, null, buffer, 0, msgLen, array, 0);
+				Reset();
+				return array;
+			}
+		}
+
+		internal bool VerifySignature(Ed25519PublicKeyParameters publicKey, byte[] signature)
+		{
+			lock (this)
+			{
+				byte[] buffer = GetBuffer();
+				int mLen = (int)Position;
+				byte[] encoded = publicKey.GetEncoded();
+				bool result = Ed25519.Verify(signature, 0, encoded, 0, buffer, 0, mLen);
+				Reset();
+				return result;
+			}
+		}
+
+		internal void Reset()
+		{
+			lock (this)
+			{
+				long position = Position;
+				Array.Clear(GetBuffer(), 0, (int)position);
+				Position = 0L;
+			}
+		}
+	}
+
+	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 = privateKey.GeneratePublicKey();
+		}
+		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 byte[] GenerateSignature()
+	{
+		if (!forSigning || privateKey == null)
+		{
+			throw new InvalidOperationException("Ed25519Signer not initialised for signature generation.");
+		}
+		return buffer.GenerateSignature(privateKey, publicKey);
+	}
+
+	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();
+	}
+}