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mnemonics: compare canonical words (lowercase)
This commit is contained in:
moneromooo-monero
parent
42abea7f72
commit
11227e0ba2
2 changed files with 115 additions and 24 deletions
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@ -76,8 +76,8 @@ namespace crypto
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namespace
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{
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uint32_t create_checksum_index(const std::vector<epee::wipeable_string> &word_list,
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uint32_t unique_prefix_length);
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bool checksum_test(std::vector<epee::wipeable_string> seed, uint32_t unique_prefix_length);
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const Language::Base *language);
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bool checksum_test(std::vector<epee::wipeable_string> seed, const Language::Base *language);
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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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@ -116,8 +116,8 @@ namespace
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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<epee::wipeable_string, uint32_t> &word_map = (*it1)->get_word_map();
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const std::unordered_map<epee::wipeable_string, uint32_t> &trimmed_word_map = (*it1)->get_trimmed_word_map();
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const std::unordered_map<epee::wipeable_string, uint32_t, Language::WordHash, Language::WordEqual> &word_map = (*it1)->get_word_map();
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const std::unordered_map<epee::wipeable_string, uint32_t, Language::WordHash, Language::WordEqual> &trimmed_word_map = (*it1)->get_trimmed_word_map();
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// To iterate through seed words
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bool full_match = true;
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@ -151,7 +151,7 @@ namespace
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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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if (!checksum_test(seed, *it1))
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{
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fallback = *it1;
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full_match = false;
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@ -190,20 +190,20 @@ namespace
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* \return Checksum index
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*/
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uint32_t create_checksum_index(const std::vector<epee::wipeable_string> &word_list,
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uint32_t unique_prefix_length)
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const Language::Base *language)
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{
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epee::wipeable_string trimmed_words = "";
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epee::wipeable_string trimmed_words = "", word;
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const auto &word_map = language->get_word_map();
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const auto &trimmed_word_map = language->get_trimmed_word_map();
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const uint32_t unique_prefix_length = language->get_unique_prefix_length();
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for (std::vector<epee::wipeable_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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word = Language::utf8prefix(*it, unique_prefix_length);
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auto it2 = trimmed_word_map.find(word);
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if (it2 == trimmed_word_map.end())
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throw std::runtime_error("Word \"" + std::string(word.data(), word.size()) + "\" not found in trimmed word map in " + language->get_english_language_name());
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trimmed_words += it2->first;
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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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@ -216,7 +216,7 @@ namespace
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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<epee::wipeable_string> seed, uint32_t unique_prefix_length)
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bool checksum_test(std::vector<epee::wipeable_string> seed, const Language::Base *language)
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{
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if (seed.empty())
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return false;
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@ -224,13 +224,16 @@ namespace
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epee::wipeable_string last_word = seed.back();
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seed.pop_back();
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epee::wipeable_string checksum = seed[create_checksum_index(seed, unique_prefix_length)];
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const uint32_t unique_prefix_length = language->get_unique_prefix_length();
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auto idx = create_checksum_index(seed, language);
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epee::wipeable_string checksum = seed[idx];
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epee::wipeable_string trimmed_checksum = checksum.length() > unique_prefix_length ? Language::utf8prefix(checksum, unique_prefix_length) :
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checksum;
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epee::wipeable_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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bool ret = trimmed_checksum == trimmed_last_word;
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bool ret = Language::WordEqual()(trimmed_checksum, trimmed_last_word);
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MINFO("Checksum is " << (ret ? "valid" : "invalid"));
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return ret;
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}
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@ -301,7 +304,7 @@ namespace crypto
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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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if (!checksum_test(seed, language))
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{
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// Checksum fail
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MERROR("Invalid seed: invalid checksum");
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@ -424,7 +427,7 @@ namespace crypto
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memwipe(w, sizeof(w));
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}
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words += words_store[create_checksum_index(words_store, language->get_unique_prefix_length())];
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words += words_store[create_checksum_index(words_store, language)];
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return true;
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}
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@ -38,7 +38,9 @@
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#include <vector>
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#include <unordered_map>
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#include <string>
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#include <boost/algorithm/string.hpp>
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#include "misc_log_ex.h"
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#include "fnv1.h"
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/*!
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* \namespace Language
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@ -71,6 +73,92 @@ namespace Language
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return prefix;
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}
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template<typename T>
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inline T utf8canonical(const T &s)
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{
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T sc = "";
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size_t avail = s.size();
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const char *ptr = s.data();
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wint_t cp = 0;
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int bytes = 1;
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char wbuf[8], *wptr;
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while (avail--)
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{
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if ((*ptr & 0x80) == 0)
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{
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cp = *ptr++;
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bytes = 1;
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}
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else if ((*ptr & 0xe0) == 0xc0)
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{
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if (avail < 1)
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throw std::runtime_error("Invalid UTF-8");
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cp = (*ptr++ & 0x1f) << 6;
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cp |= *ptr++ & 0x3f;
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--avail;
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bytes = 2;
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}
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else if ((*ptr & 0xf0) == 0xe0)
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{
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if (avail < 2)
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throw std::runtime_error("Invalid UTF-8");
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cp = (*ptr++ & 0xf) << 12;
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cp |= (*ptr++ & 0x3f) << 6;
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cp |= *ptr++ & 0x3f;
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avail -= 2;
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bytes = 3;
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}
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else if ((*ptr & 0xf8) == 0xf0)
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{
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if (avail < 3)
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throw std::runtime_error("Invalid UTF-8");
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cp = (*ptr++ & 0x7) << 18;
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cp |= (*ptr++ & 0x3f) << 12;
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cp |= (*ptr++ & 0x3f) << 6;
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cp |= *ptr++ & 0x3f;
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avail -= 3;
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bytes = 4;
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}
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else
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throw std::runtime_error("Invalid UTF-8");
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cp = std::towlower(cp);
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wptr = wbuf;
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switch (bytes)
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{
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case 1: *wptr++ = cp; break;
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case 2: *wptr++ = 0xc0 | (cp >> 6); *wptr++ = 0x80 | (cp & 0x3f); break;
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case 3: *wptr++ = 0xe0 | (cp >> 12); *wptr++ = 0x80 | ((cp >> 6) & 0x3f); *wptr++ = 0x80 | (cp & 0x3f); break;
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case 4: *wptr++ = 0xf0 | (cp >> 18); *wptr += 0x80 | ((cp >> 12) & 0x3f); *wptr++ = 0x80 | ((cp >> 6) & 0x3f); *wptr++ = 0x80 | (cp & 0x3f); break;
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default: throw std::runtime_error("Invalid UTF-8");
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}
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*wptr = 0;
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sc += T(wbuf, bytes);
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cp = 0;
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bytes = 1;
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}
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return sc;
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}
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struct WordHash
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{
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std::size_t operator()(const epee::wipeable_string &s) const
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{
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const epee::wipeable_string sc = utf8canonical(s);
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return epee::fnv::FNV1a(sc.data(), sc.size());
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}
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};
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struct WordEqual
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{
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bool operator()(const epee::wipeable_string &s0, const epee::wipeable_string &s1) const
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{
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const epee::wipeable_string s0c = utf8canonical(s0);
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const epee::wipeable_string s1c = utf8canonical(s1);
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return s0c == s1c;
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}
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};
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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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@ -87,8 +175,8 @@ namespace Language
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NWORDS = 1626
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};
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std::vector<std::string> word_list; /*!< A pointer to the array of words */
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std::unordered_map<epee::wipeable_string, uint32_t> word_map; /*!< hash table to find word's index */
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std::unordered_map<epee::wipeable_string, uint32_t> trimmed_word_map; /*!< hash table to find word's trimmed index */
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std::unordered_map<epee::wipeable_string, uint32_t, WordHash, WordEqual> word_map; /*!< hash table to find word's index */
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std::unordered_map<epee::wipeable_string, uint32_t, WordHash, WordEqual> 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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std::string english_language_name; /*!< Name of language */
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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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@ -159,7 +247,7 @@ namespace Language
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* \brief Returns a pointer to the word map.
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* \return A pointer to the word map.
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*/
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const std::unordered_map<epee::wipeable_string, uint32_t>& get_word_map() const
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const std::unordered_map<epee::wipeable_string, uint32_t, WordHash, WordEqual>& get_word_map() const
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{
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return word_map;
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}
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@ -167,7 +255,7 @@ namespace Language
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* \brief Returns a pointer to the trimmed word map.
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* \return A pointer to the trimmed word map.
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*/
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const std::unordered_map<epee::wipeable_string, uint32_t>& get_trimmed_word_map() const
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const std::unordered_map<epee::wipeable_string, uint32_t, WordHash, WordEqual>& get_trimmed_word_map() const
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{
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return trimmed_word_map;
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}
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