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// Copyright (c) 2014-2017, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/*!
* \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 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(std::string words, std::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(std::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, std::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, std::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.
*/
void get_language_list(std::vector<std::string> &languages);
/*!
* \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(std::string seed);
}
}
#endif
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