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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.Diagnostics;
using System.Runtime.InteropServices;
using VNLib.Utils.Cryptography.Noscrypt.@internal;
using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
using NCResult = System.Int64;
namespace VNLib.Utils.Cryptography.Noscrypt.Encryption
{
public unsafe static class NCCipherUtil
{
/*
* This class wraps the low-level cipher functions provided by
* the Noscrypt utility side-car library.
*/
internal static nint Alloc(NCContext ctx, uint version, uint flags)
{
nint cipher = GetTable(ctx).NCUtilCipherAlloc(version, flags);
if (cipher == nint.Zero)
{
throw new OutOfMemoryException("Failed to allocate cipher context");
}
//Ensure flags are identical to those set during allocation
Debug.Assert(GetFlags(ctx, cipher) == flags);
return cipher;
}
internal static uint GetFlags(NCContext ctx, nint cipher)
{
NCResult result = GetTable(ctx).NCUtilCipherGetFlags(cipher);
NCUtil.CheckResult<FunctionTable.NCUtilCipherGetFlagsDelegate>(result, raiseOnFailure: true);
return (uint)result;
}
internal static void Free(NCContext ctx, nint cipher) => GetTable(ctx).NCUtilCipherFree(cipher);
internal static int GetIvSize(NCContext ctx, nint cipher)
{
NCResult result = GetTable(ctx).NCUtilCipherGetIvSize(cipher);
NCUtil.CheckResult<FunctionTable.NCUtilCipherGetIvSizeDelegate>(result, raiseOnFailure: true);
return checked((int)result);
}
internal static void SetProperty(NCContext ctx, nint cipher, uint property, ref readonly byte value, uint valueLen)
{
fixed (byte* valPtr = &value)
{
NCResult result = GetTable(ctx).NCUtilCipherSetProperty(cipher, property, valPtr, valueLen);
NCUtil.CheckResult<FunctionTable.NCUtilCipherSetPropertyDelegate>(result, raiseOnFailure: true);
}
}
internal static uint GetOutputSize(NCContext ctx, nint cipher)
{
NCResult result = GetTable(ctx).NCUtilCipherGetOutputSize(cipher);
NCUtil.CheckResult<FunctionTable.NCUtilCipherGetOutputSizeDelegate>(result, raiseOnFailure: true);
return (uint)result;
}
internal static uint ReadOutput(NCContext ctx, nint cipher, ref byte outputData, uint outLen)
{
fixed (byte* outPtr = &outputData)
{
NCResult result = GetTable(ctx).NCUtilCipherReadOutput(cipher, outPtr, outLen);
NCUtil.CheckResult<FunctionTable.NCUtilCipherReadOutputDelegate>(result, raiseOnFailure: true);
return (uint)result;
}
}
internal static void InitCipher(NCContext ctx, nint cipher, byte* inputPtr, uint inputSize)
{
NCResult result = GetTable(ctx).NCUtilCipherInit(cipher, inputPtr, inputSize);
NCUtil.CheckResult<FunctionTable.NCUtilCipherInitDelegate>(result, raiseOnFailure: true);
}
internal static void Update(
NCContext ctx,
nint cipher,
ref readonly NCSecretKey localKey,
ref readonly NCPublicKey remoteKey
)
{
fixed (NCSecretKey* sk = &localKey)
fixed (NCPublicKey* pk = &remoteKey)
{
NCResult result = GetTable(ctx).NCUtilCipherUpdate(
cipher: cipher,
libContext: ctx.DangerousGetHandle(),
secKey: sk,
pubKey: pk
);
NCUtil.CheckResult<FunctionTable.NCUtilCipherInitDelegate>(result, raiseOnFailure: true);
}
}
#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(
NCContext ctx,
ref readonly NCSecretKey localKey,
ref readonly NCPublicKey remoteKey,
Span<byte> conversationKeyOut32
)
{
ArgumentNullException.ThrowIfNull(ctx);
ArgumentOutOfRangeException.ThrowIfNotEqual(
conversationKeyOut32.Length,
NC_CONVERSATION_KEY_SIZE,
nameof(conversationKeyOut32)
);
fixed (NCSecretKey* sk = &localKey)
fixed (NCPublicKey* pk = &remoteKey)
fixed(byte* convKey32Ptr = &MemoryMarshal.GetReference(conversationKeyOut32))
{
NCResult result = GetTable(ctx).NCGetConversationKey(
ctx: ctx.DangerousGetHandle(),
sk,
pk,
convKey32Ptr
);
NCUtil.CheckResult<FunctionTable.NCUtilCipherInitDelegate>(result, raiseOnFailure: true);
}
}
#endif
private static ref readonly FunctionTable GetTable(NCContext ctx)
=> ref ctx.Library.Functions;
}
}
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