99075ad22a
* whisper skeleton * basic message store * rallying and message logic * pass host info to network protocol handlers * choose who starts rally based on node key * module reshuffling * mining messages * prune messages by low PoW until below size target * associated error type for ethkey generators and `OsRng` generator * beginnings of RPC * generic message handler for whisper * reshuffle code order * standard payload encoding and decoding * basic crypto * minor restructuring of net code * implement shh_post * merge? * implement filters * rand trait for hash types * filter RPCs for whisper * symmetric encryption of payload * pub-sub * filter tests * use only secure random IDs * attach arbitrary protocols to network * basic integration of whisper into Parity * eagerly prune low PoW entries * broadcast messages with salted topics * node info RPC * fix import * fix leading zeros calculation * address minor grumbles
60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
// 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(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));
|
|
}
|
|
}
|