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- // Copyright (c) 2014-2018, 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
- #if defined(__cplusplus)
- #include <memory.h>
- #include "memwipe.h"
- #include "hash.h"
- namespace crypto {
- 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);
- #if defined(__cplusplus)
- }
- using chacha_key = tools::scrubbed_arr<uint8_t, CHACHA_KEY_SIZE>;
- #pragma pack(push, 1)
- // MS VC 2012 doesn't interpret `class chacha_iv` as POD in spite of [9.0.10], so it is a struct
- struct chacha_iv {
- uint8_t data[CHACHA_IV_SIZE];
- };
- #pragma pack(pop)
- static_assert(sizeof(chacha_key) == CHACHA_KEY_SIZE && sizeof(chacha_iv) == CHACHA_IV_SIZE, "Invalid structure size");
- inline void chacha8(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher) {
- chacha8(data, length, key.data(), reinterpret_cast<const uint8_t*>(&iv), cipher);
- }
- inline void chacha20(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher) {
- chacha20(data, length, key.data(), reinterpret_cast<const uint8_t*>(&iv), cipher);
- }
- inline void generate_chacha_key(const void *data, size_t size, chacha_key& key) {
- static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
- tools::scrubbed_arr<char, HASH_SIZE> pwd_hash;
- crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 0/*prehashed*/, 0/*height*/);
- memcpy(&key, pwd_hash.data(), sizeof(key));
- }
- inline void generate_chacha_key_prehashed(const void *data, size_t size, chacha_key& key) {
- static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
- tools::scrubbed_arr<char, HASH_SIZE> pwd_hash;
- crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 1/*prehashed*/, 0/*height*/);
- memcpy(&key, pwd_hash.data(), sizeof(key));
- }
- inline void generate_chacha_key(std::string password, chacha_key& key) {
- return generate_chacha_key(password.data(), password.size(), key);
- }
- }
- #endif
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