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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.CompilerServices;
using VNLib.Utils;
using NCResult = System.Int64;
namespace NVault.Crypto.Noscrypt
{
/// <summary>
/// A default implementation of the <see cref="INostrCrypto"/> interface
/// </summary>
/// <param name="context">The initialized library context</param>
public unsafe class NostrCrypto(NCContext context, bool ownsContext) : VnDisposeable, INostrCrypto
{
/// <summary>
/// Gets the underlying library context.
/// </summary>
public NCContext Context => context;
private ref readonly FunctionTable Functions => ref context.Library.Functions;
///<inheritdoc/>
public void Decrypt(
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ref readonly byte nonce,
ref readonly byte cipherText,
ref byte plainText,
uint size
)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
NCCryptoData data = default;
data.dataSize = size;
//Copy nonce to struct memory buffer
Unsafe.CopyBlock(
ref Unsafe.AsRef<byte>(data.nonce),
in nonce,
LibNoscrypt.NC_ENCRYPTION_NONCE_SIZE
);
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (NCPublicKey* pPubKey = &publicKey)
fixed (byte* pCipherText = &cipherText, pTextPtr = &plainText)
{
//Set input data to the cipher text to decrypt and the output data to the plaintext buffer
data.inputData = pCipherText;
data.outputData = pTextPtr;
NCResult result = Functions.NCDecrypt.Invoke(libCtx, pSecKey, pPubKey, &data);
NCUtil.CheckResult<FunctionTable.NCDecryptDelegate>(result);
}
}
///<inheritdoc/>
public void Encrypt(
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ref readonly byte nonce,
ref readonly byte plainText,
ref byte cipherText,
uint size
)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
NCCryptoData data = default;
data.dataSize = size;
//Copy nonce to struct memory buffer
Unsafe.CopyBlock(
ref Unsafe.AsRef<byte>(data.nonce),
in nonce,
0
);
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (NCPublicKey* pPubKey = &publicKey)
fixed (byte* pCipherText = &cipherText, pTextPtr = &plainText)
{
//Set input data to the plaintext to encrypt and the output data to the cipher text buffer
data.inputData = pTextPtr;
data.outputData = pCipherText;
NCResult result = Functions.NCEncrypt.Invoke(libCtx, pSecKey, pPubKey, &data);
NCUtil.CheckResult<FunctionTable.NCEncryptDelegate>(result);
}
}
///<inheritdoc/>
public void GetPublicKey(ref readonly NCSecretKey secretKey, ref NCPublicKey publicKey)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
fixed(NCSecretKey* pSecKey = &secretKey)
fixed(NCPublicKey* pPubKey = &publicKey)
{
NCResult result = Functions.NCGetPublicKey.Invoke(libCtx, pSecKey, pPubKey);
NCUtil.CheckResult<FunctionTable.NCGetPublicKeyDelegate>(result);
}
}
///<inheritdoc/>
public void SignData(
ref readonly NCSecretKey secretKey,
ref readonly byte random32,
ref readonly byte data,
nint dataSize,
ref byte sig64
)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
fixed (NCSecretKey* pSecKey = &secretKey)
fixed(byte* pData = &data, pSig = &sig64, pRandom = &random32)
{
NCResult result = Functions.NCSignData.Invoke(libCtx, pSecKey, pRandom, pData, dataSize, pSig);
NCUtil.CheckResult<FunctionTable.NCSignDataDelegate>(result);
}
}
///<inheritdoc/>
public bool ValidateSecretKey(ref readonly NCSecretKey secretKey)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
fixed (NCSecretKey* pSecKey = &secretKey)
{
/*
* Validate should return a result of 1 if the secret key is valid
* or a 0 if it is not.
*/
NCResult result = Functions.NCValidateSecretKey.Invoke(libCtx, pSecKey);
NCUtil.CheckResult<FunctionTable.NCValidateSecretKeyDelegate>(result);
//Result should be 1 if the secret key is valid
return result == 1;
}
}
///<inheritdoc/>
public void VerifyData(
ref readonly NCPublicKey pubKey,
ref readonly byte data,
nint dataSize,
ref byte sig64
)
{
Check();
IntPtr libCtx = context.DangerousGetHandle();
fixed(NCPublicKey* pPubKey = &pubKey)
fixed (byte* pData = &data, pSig = &sig64)
{
NCResult result = Functions.NCVerifyData.Invoke(libCtx, pPubKey, pData, dataSize, pSig);
NCUtil.CheckResult<FunctionTable.NCVerifyDataDelegate>(result);
}
}
///<inheritdoc/>
protected override void Free()
{
if(ownsContext)
{
context.Dispose();
}
}
}
}
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