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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.Diagnostics;
using Microsoft.Win32.SafeHandles;
using VNLib.Utils.Extensions;
using VNLib.Utils.Memory;
using static VNLib.Utils.Cryptography.Noscrypt.LibNoscrypt;
using NCResult = System.Int64;
namespace VNLib.Utils.Cryptography.Noscrypt
{
/// <summary>
/// Represents a context for the native library
/// </summary>
/// <param name="Heap">The heap the handle was allocated from</param>
/// <param name="Library">A reference to the native library</param>
public sealed class NCContext : SafeHandleZeroOrMinusOneIsInvalid
{
private readonly IUnmangedHeap Heap;
/// <summary>
/// The library this context was created from
/// </summary>
public LibNoscrypt Library { get; }
internal NCContext(IntPtr handle, IUnmangedHeap heap, LibNoscrypt library) :base(true)
{
ArgumentNullException.ThrowIfNull(heap);
ArgumentNullException.ThrowIfNull(library);
Heap = heap;
Library = library;
//Store the handle
SetHandle(handle);
}
/// <summary>
/// Reinitializes the context with the specified entropy
/// </summary>
/// <param name="entropy">The randomness buffer used to randomize the context</param>
/// <param name="size">The random data buffer size (must be 32 bytes)</param>
public unsafe void Reinitalize(ref byte entropy, int size)
{
//Entropy must be exactly 32 bytes
ArgumentOutOfRangeException.ThrowIfNotEqual(size, CTX_ENTROPY_SIZE);
this.ThrowIfClosed();
fixed (byte* p = &entropy)
{
NCResult result = Library.Functions.NCReInitContext.Invoke(handle, p);
NCUtil.CheckResult<FunctionTable.NCReInitContextDelegate>(result, true);
}
}
///<inheritdoc/>
protected override bool ReleaseHandle()
{
if (!Library.IsClosed)
{
//destroy the context
Library.Functions.NCDestroyContext.Invoke(handle);
Trace.WriteLine($"Destroyed noscrypt context 0x{handle:x}");
}
//Free the handle
return Heap.Free(ref handle);
}
}
}
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