chacha20.h

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// 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