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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Bcpg.OpenPgp
{
internal sealed class EdDsaSigner
: ISigner
{
private readonly ISigner m_signer;
private readonly IDigest m_digest;
private readonly byte[] m_digBuf;
internal EdDsaSigner(ISigner signer, IDigest digest)
{
m_signer = signer;
m_digest = digest;
m_digBuf = new byte[digest.GetDigestSize()];
}
public string AlgorithmName => m_signer.AlgorithmName;
public void Init(bool forSigning, ICipherParameters cipherParameters)
{
m_signer.Init(forSigning, cipherParameters);
m_digest.Reset();
}
public void Update(byte b)
{
m_digest.Update(b);
}
public void BlockUpdate(byte[] input, int inOff, int inLen)
{
m_digest.BlockUpdate(input, inOff, inLen);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public void BlockUpdate(ReadOnlySpan<byte> input)
{
m_digest.BlockUpdate(input);
}
#endif
public int GetMaxSignatureSize() => m_signer.GetMaxSignatureSize();
public byte[] GenerateSignature()
{
m_digest.DoFinal(m_digBuf, 0);
m_signer.BlockUpdate(m_digBuf, 0, m_digBuf.Length);
return m_signer.GenerateSignature();
}
public bool VerifySignature(byte[] signature)
{
m_digest.DoFinal(m_digBuf, 0);
m_signer.BlockUpdate(m_digBuf, 0, m_digBuf.Length);
return m_signer.VerifySignature(signature);
}
public void Reset()
{
Arrays.Clear(m_digBuf);
m_signer.Reset();
m_digest.Reset();
}
}
}
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