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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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72 lines
1.5 KiB
72 lines
1.5 KiB
/* |
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* Copyright (c) 2013-2018, 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 LEGACY_OPENSSL |
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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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} |
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} |
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} |
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#endif |
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#endif
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