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LibCrypto: Add ChaCha20

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stelar7 2022-04-10 13:39:56 +02:00 • committed by Ali Mohammad Pur
parent 5397278bfc
commit 7bd0ebb1ab
5 changed files with 334 additions and 0 deletions
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31
Userland/Libraries/LibCrypto/Cipher/ChaCha20.h Normal file
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/*
* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/ByteBuffer.h>
namespace Crypto::Cipher {
class ChaCha20 {
static constexpr u32 CONSTANT_16_BYTES[] { 0x61707865, 0x3120646E, 0x79622D36, 0x6B206574 };
static constexpr u32 CONSTANT_32_BYTES[] { 0x61707865, 0x3320646E, 0x79622D32, 0x6B206574 };
public:
ChaCha20(ReadonlyBytes key, ReadonlyBytes nonce, u32 initial_counter = 0);
void encrypt(ReadonlyBytes input, Bytes& output);
void decrypt(ReadonlyBytes input, Bytes& output);
private:
void run_cipher(ReadonlyBytes input, Bytes& output);
void generate_block();
ALWAYS_INLINE void do_quarter_round(u32& a, u32& b, u32& c, u32& d);
u32 m_state[16] {};
u32 m_block[16] {};
};
}