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If a checksum word is present, language detection would use just the word prefixes. However, a set of word prefixes may be found in more than one language, and so the wrong language may be found first, which could then fail the checksum, since the check may be done with a different unique prefix length from the one it was created from. We now make a checksum test when we we detect a language from prefixes only, to make sure we have the correct one.
414 lines
14 KiB
C++
414 lines
14 KiB
C++
// Copyright (c) 2014-2016, 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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