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414 lines
14 KiB
C++
414 lines
14 KiB
C++
// Copyright (c) 2014-2017, 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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* \file electrum-words.cpp
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*
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* \brief Mnemonic seed generation and wallet restoration from them.
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*
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* This file and its header file are for translating Electrum-style word lists
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* into their equivalent byte representations for cross-compatibility with
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* that method of "backing up" one's wallet keys.
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*/
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#include <string>
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#include <cassert>
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#include <map>
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#include <cstdint>
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#include <vector>
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#include <unordered_map>
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#include <boost/algorithm/string.hpp>
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#include "crypto/crypto.h" // for declaration of crypto::secret_key
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#include <fstream>
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#include "mnemonics/electrum-words.h"
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#include <stdexcept>
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#include <boost/filesystem.hpp>
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#include <boost/crc.hpp>
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#include <boost/algorithm/string/join.hpp>
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#include "english.h"
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#include "italian.h"
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#include "german.h"
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#include "spanish.h"
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#include "portuguese.h"
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#include "japanese.h"
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#include "russian.h"
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#include "old_english.h"
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#include "language_base.h"
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#include "singleton.h"
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namespace
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{
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uint32_t create_checksum_index(const std::vector<std::string> &word_list,
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uint32_t unique_prefix_length);
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bool checksum_test(std::vector<std::string> seed, uint32_t unique_prefix_length);
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/*!
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* \brief Finds the word list that contains the seed words and puts the indices
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* where matches occured in matched_indices.
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* \param seed List of words to match.
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* \param has_checksum The seed has a checksum word (maybe not checked).
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* \param matched_indices The indices where the seed words were found are added to this.
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* \param language Language instance pointer to write to after it is found.
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* \return true if all the words were present in some language false if not.
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*/
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bool find_seed_language(const std::vector<std::string> &seed,
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bool has_checksum, std::vector<uint32_t> &matched_indices, Language::Base **language)
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{
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// If there's a new language added, add an instance of it here.
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std::vector<Language::Base*> language_instances({
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Language::Singleton<Language::English>::instance(),
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Language::Singleton<Language::Spanish>::instance(),
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Language::Singleton<Language::German>::instance(),
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Language::Singleton<Language::Italian>::instance(),
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Language::Singleton<Language::Portuguese>::instance(),
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Language::Singleton<Language::Japanese>::instance(),
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Language::Singleton<Language::Russian>::instance(),
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Language::Singleton<Language::OldEnglish>::instance()
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});
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Language::Base *fallback = NULL;
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// Iterate through all the languages and find a match
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for (std::vector<Language::Base*>::iterator it1 = language_instances.begin();
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it1 != language_instances.end(); it1++)
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{
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const std::unordered_map<std::string, uint32_t> &word_map = (*it1)->get_word_map();
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const std::unordered_map<std::string, uint32_t> &trimmed_word_map = (*it1)->get_trimmed_word_map();
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// To iterate through seed words
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std::vector<std::string>::const_iterator it2;
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bool full_match = true;
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std::string trimmed_word;
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// Iterate through all the words and see if they're all present
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for (it2 = seed.begin(); it2 != seed.end(); it2++)
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{
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if (has_checksum)
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{
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trimmed_word = Language::utf8prefix(*it2, (*it1)->get_unique_prefix_length());
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// Use the trimmed words and map
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if (trimmed_word_map.count(trimmed_word) == 0)
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{
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full_match = false;
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break;
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}
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matched_indices.push_back(trimmed_word_map.at(trimmed_word));
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}
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else
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{
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if (word_map.count(*it2) == 0)
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{
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full_match = false;
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break;
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}
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matched_indices.push_back(word_map.at(*it2));
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}
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}
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if (full_match)
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{
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// if we were using prefix only, and we have a checksum, check it now
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// to avoid false positives due to prefix set being too common
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if (has_checksum)
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if (!checksum_test(seed, (*it1)->get_unique_prefix_length()))
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{
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fallback = *it1;
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full_match = false;
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}
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}
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if (full_match)
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{
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*language = *it1;
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return true;
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}
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// Some didn't match. Clear the index array.
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matched_indices.clear();
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}
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// if we get there, we've not found a good match, but we might have a fallback,
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// if we detected a match which did not fit the checksum, which might be a badly
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// typed/transcribed seed in the right language
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if (fallback)
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{
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*language = fallback;
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return true;
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}
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return false;
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}
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/*!
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* \brief Creates a checksum index in the word list array on the list of words.
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* \param word_list Vector of words
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* \param unique_prefix_length the prefix length of each word to use for checksum
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* \return Checksum index
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*/
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uint32_t create_checksum_index(const std::vector<std::string> &word_list,
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uint32_t unique_prefix_length)
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{
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std::string trimmed_words = "";
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for (std::vector<std::string>::const_iterator it = word_list.begin(); it != word_list.end(); it++)
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{
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if (it->length() > unique_prefix_length)
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{
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trimmed_words += Language::utf8prefix(*it, unique_prefix_length);
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}
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else
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{
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trimmed_words += *it;
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}
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}
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boost::crc_32_type result;
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result.process_bytes(trimmed_words.data(), trimmed_words.length());
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return result.checksum() % crypto::ElectrumWords::seed_length;
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}
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/*!
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* \brief Does the checksum test on the seed passed.
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* \param seed Vector of seed words
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* \param unique_prefix_length the prefix length of each word to use for checksum
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* \return True if the test passed false if not.
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*/
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bool checksum_test(std::vector<std::string> seed, uint32_t unique_prefix_length)
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{
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// The last word is the checksum.
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std::string last_word = seed.back();
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seed.pop_back();
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std::string checksum = seed[create_checksum_index(seed, unique_prefix_length)];
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std::string trimmed_checksum = checksum.length() > unique_prefix_length ? Language::utf8prefix(checksum, unique_prefix_length) :
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checksum;
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std::string trimmed_last_word = last_word.length() > unique_prefix_length ? Language::utf8prefix(last_word, unique_prefix_length) :
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last_word;
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return trimmed_checksum == trimmed_last_word;
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}
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}
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/*!
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* \namespace crypto
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*
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* \brief crypto namespace.
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*/
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namespace crypto
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{
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/*!
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* \namespace crypto::ElectrumWords
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*
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* \brief Mnemonic seed word generation and wallet restoration helper functions.
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*/
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namespace ElectrumWords
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{
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/*!
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* \brief Converts seed words to bytes (secret key).
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* \param words String containing the words separated by spaces.
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* \param dst To put the secret key restored from the words.
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* \param language_name Language of the seed as found gets written here.
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* \return false if not a multiple of 3 words, or if word is not in the words list
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*/
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bool words_to_bytes(std::string words, crypto::secret_key& dst,
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std::string &language_name)
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{
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std::vector<std::string> seed;
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boost::algorithm::trim(words);
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boost::split(seed, words, boost::is_any_of(" "));
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// error on non-compliant word list
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if (seed.size() != seed_length/2 && seed.size() != seed_length &&
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seed.size() != seed_length + 1)
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{
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return false;
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}
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// If it is seed with a checksum.
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bool has_checksum = seed.size() == (seed_length + 1);
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std::vector<uint32_t> matched_indices;
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Language::Base *language;
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if (!find_seed_language(seed, has_checksum, matched_indices, &language))
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{
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return false;
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}
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language_name = language->get_language_name();
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uint32_t word_list_length = language->get_word_list().size();
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if (has_checksum)
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{
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if (!checksum_test(seed, language->get_unique_prefix_length()))
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{
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// Checksum fail
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return false;
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}
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seed.pop_back();
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}
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for (unsigned int i=0; i < seed.size() / 3; i++)
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{
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uint32_t val;
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uint32_t w1, w2, w3;
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w1 = matched_indices[i*3];
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w2 = matched_indices[i*3 + 1];
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w3 = matched_indices[i*3 + 2];
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val = w1 + word_list_length * (((word_list_length - w1) + w2) % word_list_length) +
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word_list_length * word_list_length * (((word_list_length - w2) + w3) % word_list_length);
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if (!(val % word_list_length == w1)) return false;
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memcpy(dst.data + i * 4, &val, 4); // copy 4 bytes to position
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}
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std::string wlist_copy = words;
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if (seed.size() == seed_length/2)
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{
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memcpy(dst.data+16, dst.data, 16); // if electrum 12-word seed, duplicate
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wlist_copy += ' ';
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wlist_copy += words;
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}
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return true;
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}
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/*!
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* \brief Converts bytes (secret key) to seed words.
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* \param src Secret key
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* \param words Space delimited concatenated words get written here.
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* \param language_name Seed language name
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* \return true if successful false if not. Unsuccessful if wrong key size.
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*/
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bool bytes_to_words(const crypto::secret_key& src, std::string& words,
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const std::string &language_name)
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{
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if (sizeof(src.data) % 4 != 0 || sizeof(src.data) == 0) return false;
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Language::Base *language;
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if (language_name == "English")
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{
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language = Language::Singleton<Language::English>::instance();
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}
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else if (language_name == "Spanish")
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{
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language = Language::Singleton<Language::Spanish>::instance();
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}
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else if (language_name == "Portuguese")
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{
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language = Language::Singleton<Language::Portuguese>::instance();
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}
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else if (language_name == "Japanese")
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{
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language = Language::Singleton<Language::Japanese>::instance();
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}
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else if (language_name == "Italian")
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{
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language = Language::Singleton<Language::Italian>::instance();
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}
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else if (language_name == "German")
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{
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language = Language::Singleton<Language::German>::instance();
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}
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else if (language_name == "Russian")
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{
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language = Language::Singleton<Language::Russian>::instance();
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}
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else
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{
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return false;
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}
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const std::vector<std::string> &word_list = language->get_word_list();
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// To store the words for random access to add the checksum word later.
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std::vector<std::string> words_store;
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uint32_t word_list_length = word_list.size();
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// 8 bytes -> 3 words. 8 digits base 16 -> 3 digits base 1626
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for (unsigned int i=0; i < sizeof(src.data)/4; i++, words += ' ')
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{
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uint32_t w1, w2, w3;
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uint32_t val;
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memcpy(&val, (src.data) + (i * 4), 4);
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w1 = val % word_list_length;
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w2 = ((val / word_list_length) + w1) % word_list_length;
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w3 = (((val / word_list_length) / word_list_length) + w2) % word_list_length;
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words += word_list[w1];
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words += ' ';
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words += word_list[w2];
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words += ' ';
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words += word_list[w3];
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words_store.push_back(word_list[w1]);
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words_store.push_back(word_list[w2]);
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words_store.push_back(word_list[w3]);
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}
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words.pop_back();
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words += (' ' + words_store[create_checksum_index(words_store, language->get_unique_prefix_length())]);
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return true;
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}
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/*!
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* \brief Gets a list of seed languages that are supported.
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* \param languages The vector is set to the list of languages.
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*/
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void get_language_list(std::vector<std::string> &languages)
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{
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std::vector<Language::Base*> language_instances({
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Language::Singleton<Language::English>::instance(),
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Language::Singleton<Language::Spanish>::instance(),
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Language::Singleton<Language::German>::instance(),
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Language::Singleton<Language::Italian>::instance(),
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Language::Singleton<Language::Portuguese>::instance(),
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Language::Singleton<Language::Russian>::instance(),
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Language::Singleton<Language::Japanese>::instance()
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});
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for (std::vector<Language::Base*>::iterator it = language_instances.begin();
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it != language_instances.end(); it++)
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{
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languages.push_back((*it)->get_language_name());
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}
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}
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/*!
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* \brief Tells if the seed passed is an old style seed or not.
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* \param seed The seed to check (a space delimited concatenated word list)
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* \return true if the seed passed is a old style seed false if not.
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*/
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bool get_is_old_style_seed(const std::string &seed)
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{
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std::vector<std::string> word_list;
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boost::split(word_list, seed, boost::is_any_of(" "));
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return word_list.size() != (seed_length + 1);
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}
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}
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}
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