mirror of
https://github.com/RGBCube/serenity
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31 lines
802 B
C++
31 lines
802 B
C++
/*
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* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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namespace Crypto::Cipher {
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class ChaCha20 {
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static constexpr u32 CONSTANT_16_BYTES[] { 0x61707865, 0x3120646E, 0x79622D36, 0x6B206574 };
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static constexpr u32 CONSTANT_32_BYTES[] { 0x61707865, 0x3320646E, 0x79622D32, 0x6B206574 };
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public:
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ChaCha20(ReadonlyBytes key, ReadonlyBytes nonce, u32 initial_counter = 0);
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void encrypt(ReadonlyBytes input, Bytes& output);
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void decrypt(ReadonlyBytes input, Bytes& output);
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private:
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void run_cipher(ReadonlyBytes input, Bytes& output);
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void generate_block();
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ALWAYS_INLINE void do_quarter_round(u32& a, u32& b, u32& c, u32& d);
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u32 m_state[16] {};
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u32 m_block[16] {};
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};
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}
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