git / moonbite-core / src/crypto/chacha20.h · raw

// Copyright (c) 2017-2019 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 <stdint.h>#include <stdlib.h>/** A class for ChaCha20 256-bit stream cipher developed by Daniel J. Bernstein    https://cr.yp.to/chacha/chacha-20080128.pdf */class ChaCha20{private:    uint32_t input[16];public:    ChaCha20();    ChaCha20(const unsigned char* key, size_t keylen);    void SetKey(const unsigned char* key, size_t keylen); //!< set key with flexible keylength; 256bit recommended */    void SetIV(uint64_t iv); // set the 64bit nonce    void Seek(uint64_t pos); // set the 64bit block counter    /** outputs the keystream of size <bytes> into <c> */    void Keystream(unsigned char* c, size_t bytes);    /** enciphers the message <input> of length <bytes> and write the enciphered representation into <output>     *  Used for encryption and decryption (XOR)     */    void Crypt(const unsigned char* input, unsigned char* output, size_t bytes);};#endif // BITCOIN_CRYPTO_CHACHA20_H