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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Accounts
* File: RsaClientDataEncryption.cs
*
* RsaClientDataEncryption.cs is part of VNLib.Plugins.Essentials.Accounts
* which is part of the larger VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Accounts 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.Essentials.Accounts 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.Security.Cryptography;
using VNLib.Utils;
using VNLib.Utils.Memory;
namespace VNLib.Plugins.Essentials.Accounts.SecurityProvider
{
internal static class RsaClientDataEncryption
{
/// <summary>
/// The client data encryption padding. Client library must match this padding
/// </summary>
public static readonly RSAEncryptionPadding ClientEncryptonPadding = RSAEncryptionPadding.OaepSHA256;
/// <summary>
/// Tries to encrypt the specified data using the specified public key
/// </summary>
/// <param name="base64PubKey">A base64 encoded public key used to encrypt client data</param>
/// <param name="data">Data to encrypt</param>
/// <param name="outputBuffer">The buffer to store encrypted data in</param>
/// <returns>
/// The number of encrypted bytes written to the output buffer,
/// or false (0) if the operation failed, or if no credential is
/// specified.
/// </returns>
/// <exception cref="CryptographicException"></exception>
public static ERRNO TryEncrypt(ReadOnlySpan<char> base64PubKey, ReadOnlySpan<byte> data, Span<byte> outputBuffer)
{
if (base64PubKey.IsEmpty)
{
return ERRNO.E_FAIL;
}
//Alloc a buffer for decoding the public key
using UnsafeMemoryHandle<byte> pubKeyBuffer = MemoryUtil.UnsafeAllocNearestPage(base64PubKey.Length, true);
//Decode the public key
ERRNO pbkBytesWritten = VnEncoding.TryFromBase64Chars(base64PubKey, pubKeyBuffer.Span);
//Try to encrypt the data
return pbkBytesWritten ? TryEncrypt(pubKeyBuffer.Span[..(int)pbkBytesWritten], data, outputBuffer) : ERRNO.E_FAIL;
}
/// <summary>
/// Tries to encrypt the specified data using the specified public key
/// </summary>
/// <param name="rawPubKey">The raw SKI public key</param>
/// <param name="data">Data to encrypt</param>
/// <param name="outputBuffer">The buffer to store encrypted data in</param>
/// <returns>
/// The number of encrypted bytes written to the output buffer,
/// or false (0) if the operation failed, or if no credential is
/// specified.
/// </returns>
/// <exception cref="CryptographicException"></exception>
public static ERRNO TryEncrypt(ReadOnlySpan<byte> rawPubKey, ReadOnlySpan<byte> data, Span<byte> outputBuffer)
{
if (rawPubKey.IsEmpty)
{
return false;
}
//Setup new empty rsa
using RSA rsa = RSA.Create();
//Import the public key
rsa.ImportSubjectPublicKeyInfo(rawPubKey, out _);
//Encrypt data with OaepSha256 as configured in the browser
return rsa.TryEncrypt(data, outputBuffer, ClientEncryptonPadding, out int bytesWritten) ? bytesWritten : ERRNO.E_FAIL;
}
}
}
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