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// Copyright (C) 2023 Vaughn Nugent
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
using System;
using System.Runtime.InteropServices;
namespace NVault.Crypto.Secp256k1
{
[StructLayout(LayoutKind.Sequential)]
public unsafe readonly ref struct Secp256HashFuncState
{
/// <summary>
/// The opaque pointer passed to the hash function
/// </summary>
public readonly IntPtr Opaque { get; }
private readonly byte* _output;
private readonly byte* _xCoord;
private readonly int _outputLength;
private readonly int _xCoordLength;
internal Secp256HashFuncState(byte* output, int outputLength, byte* xCoord, int xCoordLength, IntPtr opaque)
{
Opaque = opaque;
_output = output;
_outputLength = outputLength;
_xCoord = xCoord;
_xCoordLength = xCoordLength;
}
/// <summary>
/// Gets the output buffer as a span
/// </summary>
/// <returns>The output buffer span</returns>
public readonly Span<byte> GetOutput() => new(_output, _outputLength);
/// <summary>
/// Gets the x coordinate argument as a span
/// </summary>
/// <returns>The xcoordinate buffer span</returns>
public readonly ReadOnlySpan<byte> GetXCoordArg() => new(_xCoord, _xCoordLength);
}
}
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