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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.Runtime.InteropServices;
using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
namespace VNLib.Utils.Cryptography.Noscrypt
{
public static class NoscryptExtensions
{
public static void SignData(
this INostrCrypto lib,
ref readonly NCSecretKey secKey,
ReadOnlySpan<byte> random32,
ReadOnlySpan<byte> data,
Span<byte> signatureBuffer
)
{
ArgumentOutOfRangeException.ThrowIfLessThan(signatureBuffer.Length, NC_SIGNATURE_SIZE, nameof(signatureBuffer));
ArgumentOutOfRangeException.ThrowIfLessThan(random32.Length, 32, nameof(random32));
ArgumentOutOfRangeException.ThrowIfZero(data.Length, nameof(data));
lib.SignData(
secretKey: in secKey,
random32: in MemoryMarshal.GetReference(random32),
data: in MemoryMarshal.GetReference(data),
dataSize: (uint)data.Length,
sig64: ref MemoryMarshal.GetReference(signatureBuffer)
);
}
#if DEBUG
/*
* Conversation key is not meant to be a public api. Callers
* should use Encrypt/Decrypt methods to handle encryption.
*
* This method exists for vector testing purposes only.
*/
public static void GetConverstationKey(
this NostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
Span<byte> conversationKeyOut32
)
{
ArgumentNullException.ThrowIfNull(lib);
ArgumentOutOfRangeException.ThrowIfNotEqual(conversationKeyOut32.Length, NC_CONVERSATION_KEY_SIZE, nameof(conversationKeyOut32));
//Get the conversation key
lib.GetConverstationKey(
secretKey: in secretKey,
publicKey: in publicKey,
key32: ref MemoryMarshal.GetReference(conversationKeyOut32)
);
}
#endif
}
}
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