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// Copyright (c) 2017-2022 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 <cstdlib>
#include <stdint.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
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