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@ -47,21 +47,25 @@
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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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namespace
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{
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int num_words = 0;
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int num_words = 0;
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const int seed_length = 24;
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std::map<std::string,uint32_t> words_map;
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std::vector<std::string> words_array;
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bool is_old_style_mnemonics = false;
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bool is_old_style_word_list = false;
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const std::string WORD_LISTS_DIRECTORY = "wordlists";
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const std::string LANGUAGES_DIRECTORY = "languages";
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const std::string OLD_WORD_FILE = "old-word-list";
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/*!
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* Tells if the module hasn't been initialized with a word list file.
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* \brief Tells if the module hasn't been initialized with a word list file.
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* \return Whether the module hasn't been initialized with a word list file.
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*/
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bool is_uninitialized()
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@ -70,7 +74,7 @@ namespace
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}
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/*!
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* Create word list map and array data structres for use during inter-conversion between
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* \brief Create word list map and array data structres for use during inter-conversion between
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* words and secret key.
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* \param word_file Path to the word list file from pwd.
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*/
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@ -96,7 +100,7 @@ namespace
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}
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/*!
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* Tells if all the words passed in wlist was present in current word list file.
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* \brief Tells if all the words passed in wlist was present in current word list file.
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* \param wlist List of words to match.
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* \return Whether they were all present or not.
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*/
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@ -111,17 +115,31 @@ namespace
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}
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return true;
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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 words Space separated list of words
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* \return Checksum index
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*/
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uint32_t create_checksum_index(const std::string &words)
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{
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boost::crc_32_type result;
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result.process_bytes(words.data(), words.length());
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return result.checksum() % seed_length;
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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 ElectrumWords
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* \namespace crypto::ElectrumWords
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*
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* \brief Mnemonic seed word generation and wallet restoration.
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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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@ -136,12 +154,12 @@ namespace crypto
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{
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// Use the old word list file if told to.
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create_data_structures(WORD_LISTS_DIRECTORY + '/' + OLD_WORD_FILE);
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is_old_style_mnemonics = true;
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is_old_style_word_list = true;
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}
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else
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{
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create_data_structures(WORD_LISTS_DIRECTORY + '/' + LANGUAGES_DIRECTORY + '/' + language);
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is_old_style_mnemonics = false;
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is_old_style_word_list = false;
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}
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if (num_words == 0)
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{
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@ -150,19 +168,6 @@ namespace crypto
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}
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}
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/*!
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* \brief If the module is currenly using an old style word list.
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* \return Whether it is currenly using an old style word list.
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*/
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bool get_is_old_style_mnemonics()
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{
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if (is_uninitialized())
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{
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throw std::runtime_error("ElectrumWords hasn't been initialized with a word list yet.");
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}
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return is_old_style_mnemonics;
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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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@ -175,10 +180,25 @@ namespace crypto
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boost::split(wlist, words, boost::is_any_of(" "));
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// If it is seed with a checksum.
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if (wlist.size() == seed_length + 1)
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{
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// The last word is the checksum.
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std::string last_word = wlist.back();
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wlist.pop_back();
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std::string checksum = wlist[create_checksum_index(boost::algorithm::join(wlist, " "))];
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if (checksum != last_word)
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{
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// Checksum fail
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return false;
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}
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}
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// Try to find a word list file that contains all the words in the word list.
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std::vector<std::string> languages;
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get_language_list(languages);
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// Try to find a word list file that contains all the words in the word list.
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std::vector<std::string>::iterator it;
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for (it = languages.begin(); it != languages.end(); it++)
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{
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@ -232,8 +252,8 @@ namespace crypto
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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 separated words get copied here.
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* \return Whether it was successful or not. Unsuccessful if wrong key size.
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* \param words Space delimited concatenated words get written here.
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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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{
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@ -241,9 +261,12 @@ namespace crypto
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{
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init("", true);
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}
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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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int n = num_words;
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if (sizeof(src.data) % 4 != 0) return false;
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if (sizeof(src.data) % 4 != 0 || sizeof(src.data) == 0) return false;
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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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@ -263,13 +286,20 @@ namespace crypto
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words += words_array[w2];
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words += ' ';
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words += words_array[w3];
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words_store.push_back(words_array[w1]);
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words_store.push_back(words_array[w2]);
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words_store.push_back(words_array[w3]);
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}
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words.pop_back();
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words += (' ' + words_store[create_checksum_index(words)]);
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return false;
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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 list gets added to this.
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* \param languages The list of languages gets added to this vector.
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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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@ -287,6 +317,31 @@ namespace crypto
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}
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}
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/*!
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* \brief Tells if the module is currenly using an old style word list.
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* \return true if it is currenly using an old style word list false if not.
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*/
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bool get_is_old_style_word_list()
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{
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if (is_uninitialized())
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{
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throw std::runtime_error("ElectrumWords hasn't been initialized with a word list yet.");
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}
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return is_old_style_word_list;
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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> wlist;
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boost::split(wlist, seed, boost::is_any_of(" "));
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return wlist.size() != (seed_length + 1);
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}
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}
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}
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