mirror of
https://github.com/PurpleI2P/i2pd
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73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
/*
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* Copyright (c) 2013-2020, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*
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* Kovri go write your own code
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*
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*/
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#ifndef LIBI2PD_CHACHA20_H
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#define LIBI2PD_CHACHA20_H
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#include <cstdint>
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#include <cstring>
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#include <inttypes.h>
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#include <string.h>
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#include "Crypto.h"
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#if !OPENSSL_AEAD_CHACHA20_POLY1305
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namespace i2p
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{
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namespace crypto
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{
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const std::size_t CHACHA20_KEY_BYTES = 32;
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const std::size_t CHACHA20_NOUNCE_BYTES = 12;
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namespace chacha
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{
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constexpr std::size_t blocksize = 64;
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constexpr int rounds = 20;
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struct Chacha20State;
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struct Chacha20Block
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{
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Chacha20Block () {};
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Chacha20Block (Chacha20Block &&) = delete;
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uint8_t data[blocksize];
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void operator << (const Chacha20State & st);
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};
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struct Chacha20State
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{
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Chacha20State (): offset (0) {};
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Chacha20State (Chacha20State &&) = delete;
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Chacha20State & operator += (const Chacha20State & other)
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{
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for(int i = 0; i < 16; i++)
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data[i] += other.data[i];
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return *this;
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}
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void Copy(const Chacha20State & other)
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{
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memcpy(data, other.data, sizeof(uint32_t) * 16);
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}
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uint32_t data[16];
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Chacha20Block block;
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size_t offset;
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};
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void Chacha20Init (Chacha20State& state, const uint8_t * nonce, const uint8_t * key, uint32_t counter);
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void Chacha20SetCounter (Chacha20State& state, uint32_t counter);
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void Chacha20Encrypt (Chacha20State& state, uint8_t * buf, size_t sz); // encrypt buf in place
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} // namespace chacha
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} // namespace crypto
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} // namespace i2p
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#endif
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#endif
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