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use std::collections::HashSet;
use edit_distance::edit_distance;
use parity_crypto::publickey::Address;
use parity_wordlist;
use super::Brain;
pub fn brain_recover(
address: &Address,
known_phrase: &str,
expected_words: usize,
) -> Option<String> {
let it = PhrasesIterator::from_known_phrase(known_phrase, expected_words);
for phrase in it {
let keypair = Brain::new(phrase.clone()).generate();
trace!("Testing: {}, got: {:?}", phrase, keypair.address());
if &keypair.address() == address {
return Some(phrase);
}
}
None
}
fn generate_substitutions(word: &str) -> Vec<&'static str> {
let mut words = parity_wordlist::WORDS
.iter()
.cloned()
.map(|w| (edit_distance(w, word), w))
.collect::<Vec<_>>();
words.sort_by(|a, b| a.0.cmp(&b.0));
words.into_iter().map(|pair| pair.1).collect()
}
pub struct PhrasesIterator {
words: Vec<Vec<&'static str>>,
combinations: u64,
indexes: Vec<usize>,
has_next: bool,
}
impl PhrasesIterator {
pub fn from_known_phrase(known_phrase: &str, expected_words: usize) -> Self {
let known_words = parity_wordlist::WORDS
.iter()
.cloned()
.collect::<HashSet<_>>();
let mut words = known_phrase
.split(' ')
.map(|word| match known_words.get(word) {
None => {
info!(
"Invalid word '{}', looking for potential substitutions.",
word
);
let substitutions = generate_substitutions(word);
info!("Closest words: {:?}", &substitutions[..10]);
substitutions
}
Some(word) => vec![*word],
})
.collect::<Vec<_>>();
if words.len() < expected_words {
let to_add = expected_words - words.len();
info!("Number of words is insuficcient adding {} more.", to_add);
for _ in 0..to_add {
words.push(parity_wordlist::WORDS.iter().cloned().collect());
}
}
PhrasesIterator::new(words)
}
pub fn new(words: Vec<Vec<&'static str>>) -> Self {
let combinations = words.iter().fold(1u64, |acc, x| acc * x.len() as u64);
let indexes = words.iter().map(|_| 0).collect();
info!("Starting to test {} possible combinations.", combinations);
PhrasesIterator {
words,
combinations,
indexes,
has_next: combinations > 0,
}
}
pub fn combinations(&self) -> u64 {
self.combinations
}
fn current(&self) -> String {
let mut s = self.words[0][self.indexes[0]].to_owned();
for i in 1..self.indexes.len() {
s.push(' ');
s.push_str(self.words[i][self.indexes[i]]);
}
s
}
fn next_index(&mut self) -> bool {
let mut pos = self.indexes.len();
while pos > 0 {
pos -= 1;
self.indexes[pos] += 1;
if self.indexes[pos] >= self.words[pos].len() {
self.indexes[pos] = 0;
} else {
return true;
}
}
false
}
}
impl Iterator for PhrasesIterator {
type Item = String;
fn next(&mut self) -> Option<String> {
if !self.has_next {
return None;
}
let phrase = self.current();
self.has_next = self.next_index();
Some(phrase)
}
}
#[cfg(test)]
mod tests {
use super::PhrasesIterator;
#[test]
fn should_generate_possible_combinations() {
let mut it =
PhrasesIterator::new(vec![vec!["1", "2", "3"], vec!["test"], vec!["a", "b", "c"]]);
assert_eq!(it.combinations(), 9);
assert_eq!(it.next(), Some("1 test a".to_owned()));
assert_eq!(it.next(), Some("1 test b".to_owned()));
assert_eq!(it.next(), Some("1 test c".to_owned()));
assert_eq!(it.next(), Some("2 test a".to_owned()));
assert_eq!(it.next(), Some("2 test b".to_owned()));
assert_eq!(it.next(), Some("2 test c".to_owned()));
assert_eq!(it.next(), Some("3 test a".to_owned()));
assert_eq!(it.next(), Some("3 test b".to_owned()));
assert_eq!(it.next(), Some("3 test c".to_owned()));
assert_eq!(it.next(), None);
}
}
