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using System;
using Org.BouncyCastle.Crypto;
namespace Org.BouncyCastle.Pqc.Crypto.Lms
{
public sealed class LmsContext
: IDigest
{
private readonly byte[] m_c;
private readonly LMOtsPrivateKey m_privateKey;
private readonly LMSigParameters m_sigParams;
private readonly byte[][] m_path;
private readonly LMOtsPublicKey m_publicKey;
private readonly object m_signature;
private LmsSignedPubKey[] m_signedPubKeys;
private volatile IDigest m_digest;
public LmsContext(LMOtsPrivateKey privateKey, LMSigParameters sigParams, IDigest digest, byte[] C,
byte[][] path)
{
m_privateKey = privateKey;
m_sigParams = sigParams;
m_digest = digest;
m_c = C;
m_path = path;
m_publicKey = null;
m_signature = null;
}
public LmsContext(LMOtsPublicKey publicKey, object signature, IDigest digest)
{
m_publicKey = publicKey;
m_signature = signature;
m_digest = digest;
m_c = null;
m_privateKey = null;
m_sigParams = null;
m_path = null;
}
public byte[] C => m_c;
public byte[] GetQ()
{
byte[] Q = new byte[LMOts.MAX_HASH + 2];
m_digest.DoFinal(Q, 0);
m_digest = null;
return Q;
}
internal byte[][] Path => m_path;
internal LMOtsPrivateKey PrivateKey => m_privateKey;
public LMOtsPublicKey PublicKey => m_publicKey;
internal LMSigParameters SigParams => m_sigParams;
public object Signature => m_signature;
internal LmsSignedPubKey[] SignedPubKeys => m_signedPubKeys;
internal LmsContext WithSignedPublicKeys(LmsSignedPubKey[] signedPubKeys)
{
m_signedPubKeys = signedPubKeys;
return this;
}
public string AlgorithmName => m_digest.AlgorithmName;
public int GetDigestSize() => m_digest.GetDigestSize();
public int GetByteLength() => m_digest.GetByteLength();
public void Update(byte input)
{
m_digest.Update(input);
}
public void BlockUpdate(byte[] input, int inOff, int len)
{
m_digest.BlockUpdate(input, inOff, len);
}
public int DoFinal(byte[] output, int outOff)
{
return m_digest.DoFinal(output, outOff);
}
public void Reset()
{
m_digest.Reset();
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public void BlockUpdate(ReadOnlySpan<byte> input)
{
m_digest.BlockUpdate(input);
}
public int DoFinal(Span<byte> output)
{
return m_digest.DoFinal(output);
}
#endif
}
}
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