openethereum/ethkey/src/prefix.rs

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// Copyright 2015-2017 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 super::{Random, Generator, KeyPair, Error};
/// Tries to find keypair with address starting with given prefix.
pub struct Prefix {
prefix: Vec<u8>,
iterations: usize,
}
impl Prefix {
pub fn new(prefix: Vec<u8>, iterations: usize) -> Self {
Prefix {
prefix: prefix,
iterations: iterations,
}
}
}
impl Generator for Prefix {
type Error = Error;
fn generate(&mut self) -> Result<KeyPair, Error> {
for _ in 0..self.iterations {
let keypair = Random.generate()?;
if keypair.address().starts_with(&self.prefix) {
return Ok(keypair)
}
}
Err(Error::Custom("Could not find keypair".into()))
}
}
#[cfg(test)]
mod tests {
use {Generator, Prefix};
#[test]
fn prefix_generator() {
let prefix = vec![0xffu8];
let keypair = Prefix::new(prefix.clone(), usize::max_value()).generate().unwrap();
assert!(keypair.address().starts_with(&prefix));
}
}