74 lines
2.1 KiB
Rust
74 lines
2.1 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// OpenEthereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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use super::{Brain, Error, Generator, KeyPair};
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use parity_wordlist as wordlist;
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/// Tries to find brain-seed keypair with address starting with given prefix.
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pub struct BrainPrefix {
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prefix: Vec<u8>,
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iterations: usize,
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no_of_words: usize,
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last_phrase: String,
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}
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impl BrainPrefix {
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pub fn new(prefix: Vec<u8>, iterations: usize, no_of_words: usize) -> Self {
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BrainPrefix {
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prefix,
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iterations,
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no_of_words,
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last_phrase: String::new(),
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}
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}
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pub fn phrase(&self) -> &str {
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&self.last_phrase
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}
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}
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impl Generator for BrainPrefix {
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type Error = Error;
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fn generate(&mut self) -> Result<KeyPair, Error> {
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for _ in 0..self.iterations {
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let phrase = wordlist::random_phrase(self.no_of_words);
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let keypair = Brain::new(phrase.clone()).generate().unwrap();
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if keypair.address().starts_with(&self.prefix) {
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self.last_phrase = phrase;
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return Ok(keypair);
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}
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}
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Err(Error::Custom("Could not find keypair".into()))
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}
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}
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#[cfg(test)]
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mod tests {
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use BrainPrefix;
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use Generator;
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#[test]
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fn prefix_generator() {
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let prefix = vec![0x00u8];
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let keypair = BrainPrefix::new(prefix.clone(), usize::max_value(), 12)
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.generate()
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.unwrap();
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assert!(keypair.address().starts_with(&prefix));
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}
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}
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