ABC/chacha20_8h_source.html

// Copyright (c) 2017 The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.


#ifndef BITCOIN_CRYPTO_CHACHA20_H

#define BITCOIN_CRYPTO_CHACHA20_H


#include <cstdint>

#include <cstdlib>


class ChaCha20 {

private:

    uint32_t input[16];


public:

    ChaCha20();

    ChaCha20(const uint8_t *key, size_t keylen);

    void SetKey(const uint8_t *key, size_t keylen);

    // set the 64bit nonce

    void SetIV(uint64_t iv);

    // set the 64bit block counter

    void Seek(uint64_t pos);


    void Keystream(uint8_t *c, size_t bytes);


    void Crypt(const uint8_t *input, uint8_t *output, size_t bytes);

};


#endif // BITCOIN_CRYPTO_CHACHA20_H

ChaCha20
A class for ChaCha20 256-bit stream cipher developed by Daniel J.
Definition chacha20.h:15

ChaCha20::SetKey
void SetKey(const uint8_t *key, size_t keylen)
set key with flexible keylength; 256bit recommended
Definition chacha20.cpp:32

ChaCha20::Keystream
void Keystream(uint8_t *c, size_t bytes)
outputs the keystream of size <bytes> into
Definition chacha20.cpp:79

ChaCha20::Crypt
void Crypt(const uint8_t *input, uint8_t *output, size_t bytes)
enciphers the message <input> of length <bytes> and write the enciphered representation into <output>...
Definition chacha20.cpp:194

ChaCha20::input
uint32_t input[16]
Definition chacha20.h:17

ChaCha20::SetIV
void SetIV(uint64_t iv)
Definition chacha20.cpp:69

ChaCha20::ChaCha20
ChaCha20()
Definition chacha20.cpp:61

ChaCha20::Seek
void Seek(uint64_t pos)
Definition chacha20.cpp:74

GetRand
T GetRand(T nMax=std::numeric_limits< T >::max()) noexcept
Generate a uniform random integer of type T in the range [0..nMax) nMax defaults to std::numeric_limi...
Definition random.h:85