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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.InteropServices;
using VNLib.Utils.Extensions;
using VNLib.Utils.Cryptography.Noscrypt.@internal;
using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
using NCResult = System.Int64;
namespace VNLib.Utils.Cryptography.Noscrypt.Singatures
{
/// <summary>
/// Contains utility methods for signing and verifying data using the noscrypt library
/// </summary>
public unsafe static class NCSignatureUtil
{
/// <summary>
/// Signs the data using the supplied secret key and
/// entropy pointer
/// </summary>
/// <param name="context">The initialized context memory to pass to the library</param>
/// <param name="secretKey">A reference to a structure containing the private key data</param>
/// <param name="random32">A pointer to a 32 byte buffer containing high entropy random data</param>
/// <param name="data">A pointer to a buffer containing the data to sign</param>
/// <param name="dataSize">The size of the data buffer in bytes</param>
/// <param name="sig64">A pointer to a 64 byte buffer to write signature data to</param>
/// <exception cref="InvalidOperationException"></exception>
public static void SignData(
NCContext context,
ref readonly NCSecretKey secretKey,
ref readonly byte random32,
ref readonly byte data,
uint dataSize,
ref byte sig64
)
{
Check(context);
fixed (NCSecretKey* pSecKey = &secretKey)
fixed (byte* pData = &data, pSig = &sig64, pRandom = &random32)
{
NCResult result = GetTable(context).NCSignData(
ctx: context.DangerousGetHandle(),
sk: pSecKey,
random32: pRandom,
data: pData,
dataSize,
sig64: pSig
);
NCUtil.CheckResult<FunctionTable.NCSignDataDelegate>(result, raiseOnFailure: true);
}
}
/// <summary>
/// Verifies signed data against the supplied public key
/// </summary>
/// <param name="context">The initialized context memory to pass to the library</param>
/// <param name="publicKey">A reference to a structure containing the public key data</param>
/// <param name="data">A pointer to a buffer containing the data to verify</param>
/// <param name="dataSize">The size of the data buffer in bytes</param>
/// <param name="sig64">A pointer to a 64 byte buffer to read signature data from</param>
/// <returns>True if the signature was signed by the supplied public key, false otherwise</returns>
public static bool VerifyData(
NCContext context,
ref readonly NCPublicKey publicKey,
ref readonly byte data,
uint dataSize,
ref readonly byte sig64
)
{
Check(context);
fixed (NCPublicKey* pPubKey = &publicKey)
fixed (byte* pData = &data, pSig = &sig64)
{
NCResult result = GetTable(context).NCVerifyData(
context.DangerousGetHandle(),
pk: pPubKey,
data: pData,
dataSize,
sig64: pSig
);
NCUtil.CheckResult<FunctionTable.NCVerifyDataDelegate>(result, false);
return result == NC_SUCCESS;
}
}
/// <summary>
/// Signs the data using the supplied secret key and
/// entropy pointer
/// </summary>
/// <param name="context">The initialized context memory to pass to the library</param>
/// <param name="secretKey">A reference to a structure containing the private key data</param>
/// <param name="random32">A pointer to a 32 byte buffer containing high entropy random data</param>
/// <param name="data">A pointer to a buffer containing the data to sign</param>
/// <param name="signatureBuffer">A pointer to a 64 byte buffer to write signature data to</param>
/// <exception cref="InvalidOperationException"></exception>
public static void SignData(
NCContext context,
ref readonly NCSecretKey secretKey,
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));
SignData(
context,
secretKey: in secretKey,
random32: in MemoryMarshal.GetReference(random32),
data: in MemoryMarshal.GetReference(data),
dataSize: (uint)data.Length,
sig64: ref MemoryMarshal.GetReference(signatureBuffer)
);
}
/// <summary>
/// Verifies signed data against the supplied public key
/// </summary>
/// <param name="context">The initialized context memory to pass to the library</param>
/// <param name="publicKey">A reference to a structure containing the public key data</param>
/// <param name="data">A pointer to a buffer containing the data to verify</param>
/// <param name="signatureBuffer">A pointer to a 64 byte buffer to read signature data from</param>
/// <returns>True if the signature was signed by the supplied public key, false otherwise</returns>
public static bool VerifyData(
NCContext context,
ref readonly NCPublicKey publicKey,
ReadOnlySpan<byte> data,
ReadOnlySpan<byte> signatureBuffer
)
{
ArgumentOutOfRangeException.ThrowIfLessThan(signatureBuffer.Length, NC_SIGNATURE_SIZE, nameof(signatureBuffer));
ArgumentOutOfRangeException.ThrowIfZero(data.Length, nameof(data));
return VerifyData(
context,
publicKey: in publicKey,
data: in MemoryMarshal.GetReference(data),
dataSize: (uint)data.Length,
sig64: ref MemoryMarshal.GetReference(signatureBuffer)
);
}
private static void Check(NCContext? context)
{
ArgumentNullException.ThrowIfNull(context);
context.ThrowIfClosed();
}
private static ref readonly FunctionTable GetTable(NCContext ctx)
=> ref ctx.Library.Functions;
}
}
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