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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 static VNLib.Utils.Cryptography.Noscrypt.LibNoscrypt;
namespace VNLib.Utils.Cryptography.Noscrypt
{
public static class NoscryptExtensions
{
public static void EncryptNip44(
this INostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ReadOnlySpan<byte> nonce32,
ReadOnlySpan<byte> plainText,
Span<byte> hmackKeyOut32,
Span<byte> cipherText
)
{
ArgumentNullException.ThrowIfNull(lib);
//Chacha requires the output buffer to be at-least the size of the input buffer
ArgumentOutOfRangeException.ThrowIfGreaterThan(plainText.Length, cipherText.Length, nameof(plainText));
//Nonce must be exactly 32 bytes
ArgumentOutOfRangeException.ThrowIfNotEqual(nonce32.Length, NC_ENCRYPTION_NONCE_SIZE, nameof(nonce32));
ArgumentOutOfRangeException.ThrowIfNotEqual(hmackKeyOut32.Length, NC_HMAC_KEY_SIZE, nameof(hmackKeyOut32));
//Encrypt data, use the plaintext buffer size as the data size
lib.EncryptNip44(
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: in MemoryMarshal.GetReference(nonce32),
plainText: in MemoryMarshal.GetReference(plainText),
cipherText: ref MemoryMarshal.GetReference(cipherText),
size: (uint)plainText.Length,
hmacKeyOut32: ref MemoryMarshal.GetReference(hmackKeyOut32)
);
}
public static unsafe void EncryptNip44(
this INostrCrypto lib,
ref NCSecretKey secretKey,
ref NCPublicKey publicKey,
void* nonce32,
void* hmacKeyOut32,
void* plainText,
void* cipherText,
uint size
)
{
ArgumentNullException.ThrowIfNull(plainText);
ArgumentNullException.ThrowIfNull(cipherText);
ArgumentNullException.ThrowIfNull(nonce32);
//Spans are easer to forward references from pointers without screwing up arguments
EncryptNip44(
lib: lib,
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: new ReadOnlySpan<byte>(nonce32, NC_ENCRYPTION_NONCE_SIZE),
plainText: new ReadOnlySpan<byte>(plainText, (int)size),
hmackKeyOut32: new Span<byte>(hmacKeyOut32, NC_HMAC_KEY_SIZE),
cipherText: new Span<byte>(cipherText, (int)size)
);
}
public static void DecryptNip44(
this INostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ReadOnlySpan<byte> nonce32,
ReadOnlySpan<byte> cipherText,
Span<byte> plainText
)
{
ArgumentNullException.ThrowIfNull(lib);
//Chacha requires the output buffer to be at-least the size of the input buffer
ArgumentOutOfRangeException.ThrowIfGreaterThan(cipherText.Length, plainText.Length, nameof(cipherText));
//Nonce must be exactly 32 bytes
ArgumentOutOfRangeException.ThrowIfNotEqual(nonce32.Length, 32, nameof(nonce32));
//Decrypt data, use the ciphertext buffer size as the data size
lib.DecryptNip44(
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: in MemoryMarshal.GetReference(nonce32),
cipherText: in MemoryMarshal.GetReference(cipherText),
plainText: ref MemoryMarshal.GetReference(plainText),
size: (uint)cipherText.Length
);
}
public static unsafe void DecryptNip44(
this INostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
void* nonce32,
void* cipherText,
void* plainText,
uint size
)
{
ArgumentNullException.ThrowIfNull(nonce32);
ArgumentNullException.ThrowIfNull(cipherText);
ArgumentNullException.ThrowIfNull(plainText);
//Spans are easer to forward references from pointers without screwing up arguments
DecryptNip44(
lib: lib,
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: new Span<byte>(nonce32, NC_ENCRYPTION_NONCE_SIZE),
cipherText: new Span<byte>(cipherText, (int)size),
plainText: new Span<byte>(plainText, (int)size)
);
}
public static bool VerifyMac(
this INostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
ReadOnlySpan<byte> nonce32,
ReadOnlySpan<byte> mac32,
ReadOnlySpan<byte> payload
)
{
ArgumentNullException.ThrowIfNull(lib);
ArgumentOutOfRangeException.ThrowIfZero(payload.Length, nameof(payload));
ArgumentOutOfRangeException.ThrowIfNotEqual(nonce32.Length, NC_ENCRYPTION_NONCE_SIZE, nameof(nonce32));
ArgumentOutOfRangeException.ThrowIfNotEqual(mac32.Length, NC_ENCRYPTION_MAC_SIZE, nameof(mac32));
//Verify the HMAC
return lib.VerifyMac(
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: in MemoryMarshal.GetReference(nonce32),
mac32: in MemoryMarshal.GetReference(mac32),
payload: in MemoryMarshal.GetReference(payload),
payloadSize: (uint)payload.Length
);
}
public static unsafe bool VerifyMac(
this INostrCrypto lib,
ref readonly NCSecretKey secretKey,
ref readonly NCPublicKey publicKey,
void* nonce32,
void* mac32,
void* payload,
uint payloadSize
)
{
ArgumentNullException.ThrowIfNull(nonce32);
ArgumentNullException.ThrowIfNull(mac32);
ArgumentNullException.ThrowIfNull(payload);
//Spans are easer to forward references from pointers without screwing up arguments
return VerifyMac(
lib: lib,
secretKey: in secretKey,
publicKey: in publicKey,
nonce32: new Span<byte>(nonce32, NC_ENCRYPTION_NONCE_SIZE),
mac32: new Span<byte>(mac32, NC_ENCRYPTION_MAC_SIZE),
payload: new Span<byte>(payload, (int)payloadSize)
);
}
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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