80 lines
2.3 KiB
Rust
80 lines
2.3 KiB
Rust
// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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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// Parity 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 Parity. If not, see <http://www.gnu.org/licenses/>.
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use rand::{Rng, OsRng};
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use itertools::Itertools;
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pub trait Random {
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fn random() -> Self where Self: Sized;
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}
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impl Random for [u8; 16] {
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fn random() -> Self {
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let mut result = [0u8; 16];
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let mut rng = OsRng::new().unwrap();
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rng.fill_bytes(&mut result);
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result
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}
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}
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impl Random for [u8; 32] {
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fn random() -> Self {
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let mut result = [0u8; 32];
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let mut rng = OsRng::new().unwrap();
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rng.fill_bytes(&mut result);
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result
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}
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}
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/// Generate a string which is a random phrase of a number of lowercase words.
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///
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/// `words` is the number of words, chosen from a dictionary of 7,530. An value of
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/// 12 gives 155 bits of entropy (almost saturating address space); 20 gives 258 bits
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/// which is enough to saturate 32-byte key space
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pub fn random_phrase(words: usize) -> String {
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lazy_static! {
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static ref WORDS: Vec<String> = String::from_utf8_lossy(include_bytes!("../res/wordlist.txt"))
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.lines()
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.map(|s| s.to_owned())
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.collect();
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}
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let mut rng = OsRng::new().expect("Not able to operate without random source.");
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(0..words).map(|_| rng.choose(&WORDS).unwrap()).join(" ")
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}
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/// Generate a random string of given length.
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pub fn random_string(length: usize) -> String {
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let mut rng = OsRng::new().expect("Not able to operate without random source.");
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rng.gen_ascii_chars().take(length).collect()
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}
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#[cfg(test)]
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mod tests {
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use super::random_phrase;
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#[test]
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fn should_produce_right_number_of_words() {
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let p = random_phrase(10);
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assert_eq!(p.split(" ").count(), 10);
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}
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#[test]
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fn should_not_include_carriage_return() {
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let p = random_phrase(10);
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assert!(!p.contains('\r'), "Carriage return should be trimmed.");
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}
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}
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