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// Copyright (C) 2024 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;
using VNLib.Utils.Memory;
namespace NVault.Crypto.Secp256k1
{
/// <summary>
/// Represents a Secp256k1 secret key, the size is fixed, and should use
/// the sizeof() operator to get the size
/// </summary>
[StructLayout(LayoutKind.Sequential, Size = 32)]
public unsafe struct Secp256k1SecretKey
{
private fixed byte data[32];
/// <summary>
/// Implict cast to a span of raw bytes
/// </summary>
/// <param name="key">The secret key to cast</param>
public static implicit operator Span<byte>(Secp256k1SecretKey key) => new(key.data, 32);
/// <summary>
/// Casts the secret key span to a <see cref="Secp256k1SecretKey"/> via a structure copy
/// </summary>
/// <param name="key">The key data to copy</param>
/// <exception cref="ArgumentOutOfRangeException"></exception>
public static explicit operator Secp256k1SecretKey(ReadOnlySpan<byte> key) => FromSpan(key);
/// <summary>
/// Creates a new <see cref="Secp256k1SecretKey"/> from a span of bytes
/// by copying the bytes into the struct
/// </summary>
/// <param name="span">The secret key data to copy</param>
/// <returns>An initilaized <see cref="Secp256k1SecretKey"/></returns>
public static Secp256k1SecretKey FromSpan(ReadOnlySpan<byte> span)
{
Secp256k1SecretKey newKey = new();
MemoryUtil.CopyStruct(span, ref newKey);
return newKey;
}
}
}
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