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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Loading
* File: PrivateKey.cs
*
* PrivateKey.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Loading 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.
*
* VNLib.Plugins.Extensions.Loading 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.Text;
using System.Security.Cryptography;
using VNLib.Utils;
using VNLib.Utils.Memory;
using VNLib.Utils.Extensions;
namespace VNLib.Plugins.Extensions.Loading
{
/// <summary>
/// A container for a PKSC#8 encoed private key
/// </summary>
public sealed class PrivateKey : VnDisposeable
{
private readonly byte[] _utf8RawData;
/// <summary>
/// Decodes the PKCS#8 encoded private key from a secret, as an EC private key
/// and recovers the ECDsa algorithm from the key
/// </summary>
/// <returns>The <see cref="ECDsa"/> algoritm from the private key</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="CryptographicException"></exception>
public ECDsa GetECDsa()
{
//Alloc buffer
using IMemoryHandle<byte> buffer = MemoryUtil.SafeAlloc<byte>(_utf8RawData.Length);
//Get base64 bytes from utf8
ERRNO count = VnEncoding.Base64UrlDecode(_utf8RawData, buffer.Span);
//Parse the private key
ECDsa alg = ECDsa.Create();
alg.ImportPkcs8PrivateKey(buffer.Span[..(int)count], out _);
//Wipe the buffer
MemoryUtil.InitializeBlock(buffer.Span);
return alg;
}
/// <summary>
/// Decodes the PKCS#8 encoded private key from a secret, as an RSA private key
/// </summary>
/// <returns>The <see cref="RSA"/> algorithm from the private key</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="CryptographicException"></exception>
public RSA GetRSA()
{
//Alloc buffer
using IMemoryHandle<byte> buffer = MemoryUtil.SafeAlloc<byte>(_utf8RawData.Length);
//Get base64 bytes from utf8
ERRNO count = VnEncoding.Base64UrlDecode(_utf8RawData, buffer.Span);
//Parse the private key
RSA alg = RSA.Create();
alg.ImportPkcs8PrivateKey(buffer.Span[..(int)count], out _);
//Wipe the buffer
MemoryUtil.InitializeBlock(buffer.Span);
return alg;
}
internal PrivateKey(SecretResult secret)
{
//Alloc and get utf8
byte[] buffer = new byte[secret.Result.Length];
int count = Encoding.UTF8.GetBytes(secret.Result, buffer);
//Verify length
if(count != buffer.Length)
{
throw new FormatException("UTF8 deocde failed");
}
//Store
_utf8RawData = buffer;
}
protected override void Free()
{
MemoryUtil.InitializeBlock(_utf8RawData.AsSpan());
}
}
}
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