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/*!
* \file electrum-words.h
*
* \brief Mnemonic seed generation and wallet restoration from them.
*
* This file and its cpp file are for translating Electrum-style word lists
* into their equivalent byte representations for cross-compatibility with
* that method of "backing up" one's wallet keys.
*/
#ifndef ELECTRUM_WORDS_H
#define ELECTRUM_WORDS_H
#include <string>
#include <cstdint>
#include <map>
#include "crypto/crypto.h" // for declaration of crypto::secret_key
namespace epee { class wipeable_string; }
/*!
* \namespace crypto
*
* \brief crypto namespace.
*/
namespace crypto
{
/*!
* \namespace crypto::ElectrumWords
*
* \brief Mnemonic seed word generation and wallet restoration helper functions.
*/
namespace ElectrumWords
{
const int seed_length = 24;
const std::string old_language_name = "EnglishOld";
/*!
* \brief Converts seed words to bytes (secret key).
* \param words String containing the words separated by spaces.
* \param dst To put the secret data restored from the words.
* \param len The number of bytes to expect, 0 if unknown
* \param duplicate If true and len is not zero, we accept half the data, and duplicate it
* \param language_name Language of the seed as found gets written here.
* \return false if not a multiple of 3 words, or if word is not in the words list
*/
bool words_to_bytes(const epee::wipeable_string &words, epee::wipeable_string& dst, size_t len, bool duplicate,
std::string &language_name);
/*!
* \brief Converts seed words to bytes (secret key).
* \param words String containing the words separated by spaces.
* \param dst To put the secret key restored from the words.
* \param language_name Language of the seed as found gets written here.
* \return false if not a multiple of 3 words, or if word is not in the words list
*/
bool words_to_bytes(const epee::wipeable_string &words, crypto::secret_key& dst,
std::string &language_name);
/*!
* \brief Converts bytes to seed words.
* \param src Secret data
* \param len Secret data length in bytes (positive multiples of 4 only)
* \param words Space delimited concatenated words get written here.
* \param language_name Seed language name
* \return true if successful false if not. Unsuccessful if wrong key size.
*/
bool bytes_to_words(const char *src, size_t len, epee::wipeable_string& words,
const std::string &language_name);
/*!
* \brief Converts bytes (secret key) to seed words.
* \param src Secret key
* \param words Space delimited concatenated words get written here.
* \param language_name Seed language name
* \return true if successful false if not. Unsuccessful if wrong key size.
*/
bool bytes_to_words(const crypto::secret_key& src, epee::wipeable_string& words,
const std::string &language_name);
/*!
* \brief Gets a list of seed languages that are supported.
* \param languages A vector is set to the list of languages.
* \param english whether to get the names in English or the language language
*/
void get_language_list(std::vector<std::string> &languages, bool english = false);
/*!
* \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 epee::wipeable_string &seed);
/*!
* \brief Returns the name of a language in English
* \param name the name of the language in its own language
* \return the name of the language in English
*/
std::string get_english_name_for(const std::string &name);
}
}
#endif
