// Copyright (c) 2014-2019, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#pragma once

#include <stdint.h>
#include <stddef.h>

#define CHACHA_KEY_SIZE 32
#define CHACHA_IV_SIZE 8

#ifdef __cplusplus
extern "C" {
#endif

void chacha8(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher);
void chacha20(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher);

#ifdef __cplusplus
}

#include "epee/memwipe.h"
#include "epee/mlocker.h"

namespace crypto {

  using chacha_key = epee::mlocked<tools::scrubbed_arr<uint8_t, CHACHA_KEY_SIZE>>;

  struct chacha_iv {
    uint8_t data[CHACHA_IV_SIZE];
  };

  using ::chacha8;
  using ::chacha20;

  void chacha8(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher);
  void chacha20(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher);

  void generate_chacha_key(std::string password, chacha_key& key, uint64_t kdf_rounds);
  void generate_chacha_key(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds);
  void generate_chacha_key_prehashed(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds);
}

#endif