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CRC Checksum for word seed. Gives a new 25 word seed with checksum if one without checksum is passed. Doxygen comment fix.

This commit is contained in:
Oran Juice 2014-09-28 02:29:25 +05:30
parent f31adbc977
commit 8f587ba1c8
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GPG Key ID: 71C5AF46CCB28124
3 changed files with 109 additions and 41 deletions
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109
src/mnemonics/electrum-words.cpp
View File

@ -47,21 +47,25 @@
#include "mnemonics/electrum-words.h"
#include <stdexcept>
#include <boost/filesystem.hpp>
#include <boost/crc.hpp>
#include <boost/algorithm/string/join.hpp>
namespace
{
int num_words = 0;
int num_words = 0;
const int seed_length = 24;
std::map<std::string,uint32_t> words_map;
std::vector<std::string> words_array;
bool is_old_style_mnemonics = false;
bool is_old_style_word_list = false;
const std::string WORD_LISTS_DIRECTORY = "wordlists";
const std::string LANGUAGES_DIRECTORY = "languages";
const std::string OLD_WORD_FILE = "old-word-list";
/*!
* Tells if the module hasn't been initialized with a word list file.
* \brief Tells if the module hasn't been initialized with a word list file.
* \return Whether the module hasn't been initialized with a word list file.
*/
bool is_uninitialized()
@ -70,7 +74,7 @@ namespace
}
/*!
* Create word list map and array data structres for use during inter-conversion between
* \brief Create word list map and array data structres for use during inter-conversion between
* words and secret key.
* \param word_file Path to the word list file from pwd.
*/
@ -96,7 +100,7 @@ namespace
}
/*!
* Tells if all the words passed in wlist was present in current word list file.
* \brief Tells if all the words passed in wlist was present in current word list file.
* \param wlist List of words to match.
* \return Whether they were all present or not.
*/
@ -111,17 +115,31 @@ namespace
}
return true;
}
/*!
* \brief Creates a checksum index in the word list array on the list of words.
* \param words Space separated list of words
* \return Checksum index
*/
uint32_t create_checksum_index(const std::string &words)
{
boost::crc_32_type result;
result.process_bytes(words.data(), words.length());
return result.checksum() % seed_length;
}
}
/*!
* \namespace crypto
*
* \brief crypto namespace.
*/
namespace crypto
{
/*!
* \namespace ElectrumWords
* \namespace crypto::ElectrumWords
*
* \brief Mnemonic seed word generation and wallet restoration.
* \brief Mnemonic seed word generation and wallet restoration helper functions.
*/
namespace ElectrumWords
{
@ -136,12 +154,12 @@ namespace crypto
{
// Use the old word list file if told to.
create_data_structures(WORD_LISTS_DIRECTORY + '/' + OLD_WORD_FILE);
is_old_style_mnemonics = true;
is_old_style_word_list = true;
}
else
{
create_data_structures(WORD_LISTS_DIRECTORY + '/' + LANGUAGES_DIRECTORY + '/' + language);
is_old_style_mnemonics = false;
is_old_style_word_list = false;
}
if (num_words == 0)
{
@ -150,19 +168,6 @@ namespace crypto
}
}
/*!
* \brief If the module is currenly using an old style word list.
* \return Whether it is currenly using an old style word list.
*/
bool get_is_old_style_mnemonics()
{
if (is_uninitialized())
{
throw std::runtime_error("ElectrumWords hasn't been initialized with a word list yet.");
}
return is_old_style_mnemonics;
}
/*!
* \brief Converts seed words to bytes (secret key).
* \param words String containing the words separated by spaces.
@ -175,10 +180,25 @@ namespace crypto
boost::split(wlist, words, boost::is_any_of(" "));
// If it is seed with a checksum.
if (wlist.size() == seed_length + 1)
{
// The last word is the checksum.
std::string last_word = wlist.back();
wlist.pop_back();
std::string checksum = wlist[create_checksum_index(boost::algorithm::join(wlist, " "))];
if (checksum != last_word)
{
// Checksum fail
return false;
}
}
// Try to find a word list file that contains all the words in the word list.
std::vector<std::string> languages;
get_language_list(languages);
// Try to find a word list file that contains all the words in the word list.
std::vector<std::string>::iterator it;
for (it = languages.begin(); it != languages.end(); it++)
{
@ -232,8 +252,8 @@ namespace crypto
/*!
* \brief Converts bytes (secret key) to seed words.
* \param src Secret key
* \param words Space separated words get copied here.
* \return Whether it was successful or not. Unsuccessful if wrong key size.
* \param words Space delimited concatenated words get written here.
* \return true if successful false if not. Unsuccessful if wrong key size.
*/
bool bytes_to_words(const crypto::secret_key& src, std::string& words)
{
@ -241,9 +261,12 @@ namespace crypto
{
init("", true);
}
// To store the words for random access to add the checksum word later.
std::vector<std::string> words_store;
int n = num_words;
if (sizeof(src.data) % 4 != 0) return false;
if (sizeof(src.data) % 4 != 0 || sizeof(src.data) == 0) return false;
// 8 bytes -> 3 words. 8 digits base 16 -> 3 digits base 1626
for (unsigned int i=0; i < sizeof(src.data)/4; i++, words += ' ')
@ -263,13 +286,20 @@ namespace crypto
words += words_array[w2];
words += ' ';
words += words_array[w3];
words_store.push_back(words_array[w1]);
words_store.push_back(words_array[w2]);
words_store.push_back(words_array[w3]);
}
words.pop_back();
words += (' ' + words_store[create_checksum_index(words)]);
return false;
}
/*!
* \brief Gets a list of seed languages that are supported.
* \param languages The list gets added to this.
* \param languages The list of languages gets added to this vector.
*/
void get_language_list(std::vector<std::string> &languages)
{
@ -287,6 +317,31 @@ namespace crypto
}
}
/*!
* \brief Tells if the module is currenly using an old style word list.
* \return true if it is currenly using an old style word list false if not.
*/
bool get_is_old_style_word_list()
{
if (is_uninitialized())
{
throw std::runtime_error("ElectrumWords hasn't been initialized with a word list yet.");
}
return is_old_style_word_list;
}
/*!
* \brief Tells if the seed passed is an old style seed or not.
* \param seed The seed to check (a space delimited concatenated word list)
* \return true if the seed passed is a old style seed false if not.
*/
bool get_is_old_style_seed(const std::string &seed)
{
std::vector<std::string> wlist;
boost::split(wlist, seed, boost::is_any_of(" "));
return wlist.size() != (seed_length + 1);
}
}
}

25
src/mnemonics/electrum-words.h
View File

@ -43,18 +43,20 @@
/*!
* \namespace crypto
*
* \brief crypto namespace.
*/
namespace crypto
{
/*!
* \namespace ElectrumWords
* \namespace crypto::ElectrumWords
*
* \brief Mnemonic seed word generation and wallet restoration.
* \brief Mnemonic seed word generation and wallet restoration helper functions.
*/
namespace ElectrumWords
{
/*!
* \brief Called to initialize it work with a word list file.
* \brief Called to initialize it to work with a word list file.
* \param language Language of the word list file.
* \param old_word_list Whether it is to use the old style word list file.
*/
@ -71,21 +73,28 @@ namespace crypto
/*!
* \brief Converts bytes (secret key) to seed words.
* \param src Secret key
* \param words Space separated words get copied here.
* \return Whether it was successful or not. Unsuccessful if wrong key size.
* \param words Space delimited concatenated words get written here.
* \return true if successful false if not. Unsuccessful if wrong key size.
*/
bool bytes_to_words(const crypto::secret_key& src, std::string& words);
/*!
* \brief Gets a list of seed languages that are supported.
* \param languages The list gets added to this.
* \param languages The list of languages gets added to this vector.
*/
void get_language_list(std::vector<std::string> &languages);
/*!
* \brief If the module is currenly using an old style word list.
* \return Whether it is currenly using an old style word list.
* \return true if it is currenly using an old style word list false if not.
*/
bool get_is_old_style_mnemonics();
bool get_is_old_style_word_list();
/*!
* \brief Tells if the seed passed is an old style seed or not.
* \param seed The seed to check (a space delimited concatenated word list)
* \return true if the seed passed is a old style seed false if not.
*/
bool get_is_old_style_seed(const std::string &seed);
}
}

16
src/simplewallet/simplewallet.cpp
View File

@ -511,15 +511,19 @@ bool simple_wallet::new_wallet(const string &wallet_file, const std::string& pas
// convert rng value to electrum-style word list
std::string electrum_words;
// Ask for language if it is not a wallet restore or if the old version of the wallet
// had given the user an old style word list.
if (!m_restore_deterministic_wallet || crypto::ElectrumWords::get_is_old_style_mnemonics())
bool is_deprecated_wallet = m_restore_deterministic_wallet &&
(crypto::ElectrumWords::get_is_old_style_word_list() ||
crypto::ElectrumWords::get_is_old_style_seed(m_electrum_seed));
// Ask for seed language if it is not a wallet restore or if it was a deprecated wallet
// that was earlier used before this restore.
if (!m_restore_deterministic_wallet || is_deprecated_wallet)
{
if (crypto::ElectrumWords::get_is_old_style_mnemonics())
if (is_deprecated_wallet)
{
// The user had used an older version of the wallet with old style mnemonics.
message_writer(epee::log_space::console_color_green, false) << "\nYou have been using " <<
"a deprecated word list file. Please use the new seed that we provide.\n";
message_writer(epee::log_space::console_color_green, false) << "\nYou had been using " <<
"a deprecated version of the wallet. Please use the new seed that we provide.\n";
}
std::string mnemonic_language = get_mnemonic_language();
try