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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 System.Diagnostics.CodeAnalysis;
using VNLib.Utils.Cryptography.Noscrypt.@internal;
using VNLib.Utils.Cryptography.Noscrypt.Encryption;
using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
using NCResult = System.Int64;
namespace VNLib.Utils.Cryptography.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 NoscryptCipher AllocCipher(NoscryptCipherVersion version, NoscryptCipherFlags flags) => new (context, version, flags);
///<inheritdoc/>
public void GetPublicKey(ref readonly NCSecretKey secretKey, ref NCPublicKey publicKey)
{
Check();
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (NCPublicKey* pPubKey = &publicKey)
{
NCResult result = Functions.NCGetPublicKey.Invoke(context.DangerousGetHandle(), pSecKey, pPubKey);
NCUtil.CheckResult<FunctionTable.NCGetPublicKeyDelegate>(result, true);
}
}
///<inheritdoc/>
public void SignData(
ref readonly NCSecretKey secretKey,
ref readonly byte random32,
ref readonly byte data,
uint dataSize,
ref byte sig64
)
{
Check();
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (byte* pData = &data, pSig = &sig64, pRandom = &random32)
{
NCResult result = Functions.NCSignData.Invoke(
ctx: context.DangerousGetHandle(),
sk: pSecKey,
random32: pRandom,
data: pData,
dataSize,
sig64: pSig
);
NCUtil.CheckResult<FunctionTable.NCSignDataDelegate>(result, true);
}
}
///<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, false);
return result == NC_SUCCESS;
}
}
///<inheritdoc/>
public bool VerifyData(
ref readonly NCPublicKey pubKey,
ref readonly byte data,
uint dataSize,
ref readonly byte sig64
)
{
Check();
fixed(NCPublicKey* pPubKey = &pubKey)
fixed (byte* pData = &data, pSig = &sig64)
{
NCResult result = Functions.NCVerifyData.Invoke(context.DangerousGetHandle(), pPubKey, pData, dataSize, pSig);
NCUtil.CheckResult<FunctionTable.NCVerifyDataDelegate>(result, false);
return result == NC_SUCCESS;
}
}
#if DEBUG
/// <summary>
/// DEBUG ONLY: Gets the conversation key for the supplied secret key and public key
/// </summary>
/// <param name="secretKey">The sender's private key</param>
/// <param name="publicKey">The receiver's public key</param>
/// <param name="key32">A pointer to the 32byte buffer to write the conversation key to</param>
public void GetConverstationKey(
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ref byte key32
)
{
Check();
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (NCPublicKey* pPubKey = &publicKey)
fixed (byte* pKey = &key32)
{
NCResult result = Functions.NCGetConversationKey.Invoke(context.DangerousGetHandle(), pSecKey, pPubKey, pKey);
NCUtil.CheckResult<FunctionTable.NCGetConversationKeyDelegate>(result, true);
}
}
#endif
///<inheritdoc/>
protected override void Free()
{
if(ownsContext)
{
context.Dispose();
}
}
private static void ThrowIfNullRef([DoesNotReturnIf(false)] ref readonly byte value, string name)
{
if(Unsafe.IsNullRef(in value))
{
throw new ArgumentNullException(name);
}
}
}
}
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