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96 lines
4.3 KiB
C++
96 lines
4.3 KiB
C++
// Copyright (c) 2014-2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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#pragma once
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#include <stdint.h>
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#include <stddef.h>
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#define CHACHA_KEY_SIZE 32
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#define CHACHA_IV_SIZE 8
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#if defined(__cplusplus)
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#include <memory.h>
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#include "memwipe.h"
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#include "mlocker.h"
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#include "hash.h"
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namespace crypto {
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extern "C" {
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#endif
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void chacha8(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher);
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void chacha20(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher);
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#if defined(__cplusplus)
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}
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using chacha_key = epee::mlocked<tools::scrubbed_arr<uint8_t, CHACHA_KEY_SIZE>>;
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#pragma pack(push, 1)
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// MS VC 2012 doesn't interpret `class chacha_iv` as POD in spite of [9.0.10], so it is a struct
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struct chacha_iv {
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uint8_t data[CHACHA_IV_SIZE];
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};
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#pragma pack(pop)
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static_assert(sizeof(chacha_key) == CHACHA_KEY_SIZE && sizeof(chacha_iv) == CHACHA_IV_SIZE, "Invalid structure size");
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inline void chacha8(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher) {
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chacha8(data, length, key.data(), reinterpret_cast<const uint8_t*>(&iv), cipher);
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}
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inline void chacha20(const void* data, std::size_t length, const chacha_key& key, const chacha_iv& iv, char* cipher) {
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chacha20(data, length, key.data(), reinterpret_cast<const uint8_t*>(&iv), cipher);
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}
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inline void generate_chacha_key(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds) {
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static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
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epee::mlocked<tools::scrubbed_arr<char, HASH_SIZE>> pwd_hash;
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crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 0/*prehashed*/, 0/*height*/);
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for (uint64_t n = 1; n < kdf_rounds; ++n)
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crypto::cn_slow_hash(pwd_hash.data(), pwd_hash.size(), pwd_hash.data(), 0/*variant*/, 0/*prehashed*/, 0/*height*/);
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memcpy(&unwrap(unwrap(key)), pwd_hash.data(), sizeof(key));
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}
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inline void generate_chacha_key_prehashed(const void *data, size_t size, chacha_key& key, uint64_t kdf_rounds) {
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static_assert(sizeof(chacha_key) <= sizeof(hash), "Size of hash must be at least that of chacha_key");
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epee::mlocked<tools::scrubbed_arr<char, HASH_SIZE>> pwd_hash;
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crypto::cn_slow_hash(data, size, pwd_hash.data(), 0/*variant*/, 1/*prehashed*/, 0/*height*/);
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for (uint64_t n = 1; n < kdf_rounds; ++n)
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crypto::cn_slow_hash(pwd_hash.data(), pwd_hash.size(), pwd_hash.data(), 0/*variant*/, 0/*prehashed*/, 0/*height*/);
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memcpy(&unwrap(unwrap(key)), pwd_hash.data(), sizeof(key));
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}
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inline void generate_chacha_key(std::string password, chacha_key& key, uint64_t kdf_rounds) {
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return generate_chacha_key(password.data(), password.size(), key, kdf_rounds);
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}
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}
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#endif
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