openethereum/ethkey/src/brain.rs

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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
use keccak::Keccak256;
use super::{KeyPair, Generator, Secret};
use parity_wordlist;
/// Simple brainwallet.
pub struct Brain(String);
impl Brain {
pub fn new(s: String) -> Self {
Brain(s)
}
pub fn validate_phrase(phrase: &str, expected_words: usize) -> Result<(), ::WordlistError> {
parity_wordlist::validate_phrase(phrase, expected_words)
}
}
impl Generator for Brain {
type Error = ::Void;
fn generate(&mut self) -> Result<KeyPair, Self::Error> {
let seed = self.0.clone();
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let mut secret = seed.into_bytes().keccak256();
let mut i = 0;
loop {
secret = secret.keccak256();
match i > 16384 {
false => i += 1,
true => {
if let Ok(pair) = Secret::from_unsafe_slice(&secret)
.and_then(KeyPair::from_secret)
{
if pair.address()[0] == 0 {
trace!("Testing: {}, got: {:?}", self.0, pair.address());
return Ok(pair)
}
}
},
}
}
}
}
#[cfg(test)]
mod tests {
use {Brain, Generator};
#[test]
fn test_brain() {
let words = "this is sparta!".to_owned();
let first_keypair = Brain::new(words.clone()).generate().unwrap();
let second_keypair = Brain::new(words.clone()).generate().unwrap();
assert_eq!(first_keypair.secret(), second_keypair.secret());
}
}