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105 lines
2.7 KiB
105 lines
2.7 KiB
/*
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* This file and its header file are for translating Electrum-style word lists
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* into their equivalent byte representations for cross-compatibility with
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* that method of "backing up" one's wallet keys.
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*/
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#include <string>
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#include <map>
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#include <cstdint>
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#include <vector>
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#include <boost/algorithm/string.hpp>
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#include "crypto/crypto.h" // for declaration of crypto::secret_key
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#include "crypto/electrum-words.h"
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namespace crypto
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{
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namespace ElectrumWords
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{
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/* convert words to bytes, 3 words -> 4 bytes
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* returns:
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* false if not a multiple of 3 words, or if a words is not in the
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* words list
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*
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* true otherwise
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*/
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bool words_to_bytes(const std::string& words, crypto::secret_key& dst)
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{
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int n = NUMWORDS; // hardcoded because this is what electrum uses
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std::vector<std::string> wlist;
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boost::split(wlist, words, boost::is_any_of(" "));
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// error on non-compliant word list
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if (wlist.size() != 12 && wlist.size() != 24) return false;
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for (unsigned int i=0; i < wlist.size() / 3; i++)
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{
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uint32_t val;
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uint32_t w1, w2, w3;
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// verify all three words exist in the word list
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if (wordsMap.count(wlist[i*3]) == 0 ||
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wordsMap.count(wlist[i*3 + 1]) == 0 ||
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wordsMap.count(wlist[i*3 + 2]) == 0)
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{
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return false;
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}
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w1 = wordsMap.at(wlist[i*3]);
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w2 = wordsMap.at(wlist[i*3 + 1]);
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w3 = wordsMap.at(wlist[i*3 + 2]);
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val = w1 + n * ((w2 - w1) % n) + n * n * ((w3 - w2) % n);
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memcpy(&dst.data + i * 4, &val, 4); // copy 4 bytes to position
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}
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if (wlist.size() == 12)
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{
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memcpy(&dst.data, &dst.data + 16, 16); // if electrum 12-word seed, duplicate
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}
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return true;
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}
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/* convert bytes to words, 4 bytes-> 3 words
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* returns:
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* false if wrong number of bytes (shouldn't be possible)
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* true otherwise
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*/
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bool bytes_to_words(const crypto::secret_key& src, std::string& words)
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{
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int n = NUMWORDS; // hardcoded because this is what electrum uses
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if (sizeof(src.data) % 4 != 0) return false;
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// 8 bytes -> 3 words. 8 digits base 16 -> 3 digits base 1626
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for (unsigned int i=0; i < sizeof(src.data)/4; i++, words += ' ')
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{
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uint32_t w1, w2, w3;
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uint32_t val;
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memcpy(&val, &src.data, 4);
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w1 = val % n;
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w2 = ((val / n) + w1) % n;
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w3 = (((val / n) / n) + w2) % n;
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words += wordsArray[w1];
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words += ' ';
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words += wordsArray[w2];
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words += ' ';
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words += wordsArray[w3];
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}
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return false;
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}
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} // namespace ElectrumWords
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} // namespace crypto
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