openethereum/ethkey/src/brain.rs

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2016-12-11 19:30:54 +01:00
// Copyright 2015, 2016 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, Error, Generator, Secret};
/// Simple brainwallet.
pub struct Brain(String);
impl Brain {
pub fn new(s: String) -> Self {
Brain(s)
}
}
impl Generator for Brain {
fn generate(self) -> Result<KeyPair, Error> {
let seed = self.0;
let mut secret = seed.bytes().collect::<Vec<u8>>().keccak256();
let mut i = 0;
loop {
secret = secret.keccak256();
match i > 16384 {
false => i += 1,
true => {
if let Ok(secret) = Secret::from_slice(&secret) {
let result = KeyPair::from_secret(secret);
if result.as_ref().ok().map_or(false, |r| r.address()[0] == 0) {
return result;
}
}
},
}
}
}
}
#[cfg(test)]
mod tests {
use {Brain, Generator};
#[test]
fn test_brain() {
let words = "this is sparta!".to_owned();
let first_keypair = Brain(words.clone()).generate().unwrap();
let second_keypair = Brain(words.clone()).generate().unwrap();
assert_eq!(first_keypair.secret(), second_keypair.secret());
}
}