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Variable unique prefix lengths for seed
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parent
2c739371ac
commit
9875f5b875
7 changed files with 46 additions and 47 deletions
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@ -59,6 +59,8 @@
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#include "language_base.h"
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#include "singleton.h"
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#include <iostream>
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namespace
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{
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const int seed_length = 24;
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@ -69,11 +71,11 @@ namespace
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* \param seed List of words to match.
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* \param has_checksum If word list passed checksum test, we need to only do a prefix check.
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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, uint32_t &word_list_length,
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std::string &language_name)
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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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@ -83,18 +85,6 @@ namespace
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Language::Singleton<Language::Japanese>::instance(),
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Language::Singleton<Language::OldEnglish>::instance()
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});
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// To hold trimmed seed words in case of a checksum being present.
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std::vector<std::string> trimmed_seed;
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if (has_checksum)
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{
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// If it had a checksum, we'll just compare the unique prefix
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// So we create a list of trimmed seed words
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for (std::vector<std::string>::const_iterator it = seed.begin(); it != seed.end(); it++)
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{
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trimmed_seed.push_back(it->length() > Language::unique_prefix_length ?
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it->substr(0, Language::unique_prefix_length) : *it);
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}
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}
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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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@ -104,23 +94,22 @@ namespace
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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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// To iterate through trimmed seed words
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std::vector<std::string>::iterator it3;
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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(), it3 = trimmed_seed.begin();
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it2 != seed.end(); it2++, it3++)
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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 = it2->substr(0, (*it1)->get_unique_prefix_length());
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// Use the trimmed words and map
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if (trimmed_word_map.count(*it3) == 0)
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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(*it3));
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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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@ -134,8 +123,7 @@ namespace
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}
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if (full_match)
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{
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word_list_length = (*it1)->get_word_list().size();
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language_name = (*it1)->get_language_name();
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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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@ -146,18 +134,20 @@ namespace
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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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* \return Checksum index
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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 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() > 4)
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if (it->length() > unique_prefix_length)
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{
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trimmed_words += it->substr(0, Language::unique_prefix_length);
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trimmed_words += it->substr(0, unique_prefix_length);
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}
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else
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{
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@ -171,20 +161,21 @@ namespace
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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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* \return True if the test passed false if not.
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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)
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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)];
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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() > 4 ? checksum.substr(0, Language::unique_prefix_length) :
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std::string trimmed_checksum = checksum.length() > unique_prefix_length ? checksum.substr(0, unique_prefix_length) :
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checksum;
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std::string trimmed_last_word = checksum.length() > 4 ? last_word.substr(0, Language::unique_prefix_length) :
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std::string trimmed_last_word = last_word.length() > unique_prefix_length ? last_word.substr(0, 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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@ -227,9 +218,19 @@ namespace crypto
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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))
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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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@ -237,13 +238,6 @@ namespace crypto
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seed.pop_back();
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}
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std::vector<uint32_t> matched_indices;
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uint32_t word_list_length = 0;
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if (!find_seed_language(seed, has_checksum, matched_indices, word_list_length, language_name))
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{
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return false;
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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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@ -335,7 +329,7 @@ namespace crypto
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}
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words.pop_back();
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words += (' ' + words_store[create_checksum_index(words_store)]);
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words += (' ' + words_store[create_checksum_index(words_store, language->get_unique_prefix_length())]);
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return false;
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}
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@ -1681,6 +1681,7 @@ namespace Language
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"zones",
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"zoom"
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});
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unique_prefix_length = 3;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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language_name = "English";
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@ -1681,6 +1681,7 @@ namespace Language
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"びじゅつかん",
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"ひしょ"
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});
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unique_prefix_length = 4;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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language_name = "Japanese";
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@ -45,7 +45,6 @@
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*/
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namespace Language
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{
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const int unique_prefix_length = 4; /*!< Length of the prefix of all words guaranteed to be unique */
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/*!
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* \class Base
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* \brief A base language class which all languages have to inherit from for
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@ -58,7 +57,7 @@ namespace Language
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std::unordered_map<std::string, uint32_t> *word_map; /*!< hash table to find word's index */
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std::unordered_map<std::string, uint32_t> *trimmed_word_map; /*!< hash table to find word's trimmed index */
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std::string language_name; /*!< Name of language */
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int trim_length; /*!< Number of unique starting characters to trim the wordlist to when matching */
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uint32_t unique_prefix_length; /*!< Number of unique starting characters to trim the wordlist to when matching */
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/*!
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* \brief Populates the word maps after the list is ready.
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*/
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@ -85,6 +84,7 @@ namespace Language
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word_list = new std::vector<std::string>;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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unique_prefix_length = 4;
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}
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/*!
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* \brief Returns a pointer to the word list.
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* \brief Returns the number of unique starting characters to be used for matching.
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* \return Number of unique starting characters.
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*/
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int get_trim_length() const
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uint32_t get_unique_prefix_length() const
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{
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return trim_length;
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return unique_prefix_length;
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}
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};
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}
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@ -1681,6 +1681,7 @@ namespace Language
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"weapon",
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"weary"
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});
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unique_prefix_length = 4;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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language_name = "OldEnglish";
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@ -1679,6 +1679,7 @@ namespace Language
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"zenite",
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"zumbi"
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});
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unique_prefix_length = 4;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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language_name = "Portuguese";
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@ -1681,6 +1681,7 @@ namespace Language
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"ritmo",
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"rito"
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});
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unique_prefix_length = 4;
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word_map = new std::unordered_map<std::string, uint32_t>;
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trimmed_word_map = new std::unordered_map<std::string, uint32_t>;
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language_name = "Spanish";
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