openethereum/accounts/ethstore/src/random.rs

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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
// Parity Ethereum 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 Ethereum 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
use rand::{Rng, OsRng};
pub trait Random {
fn random() -> Self where Self: Sized;
}
impl Random for [u8; 16] {
fn random() -> Self {
let mut result = [0u8; 16];
let mut rng = OsRng::new().unwrap();
rng.fill_bytes(&mut result);
result
}
}
impl Random for [u8; 32] {
fn random() -> Self {
let mut result = [0u8; 32];
let mut rng = OsRng::new().unwrap();
rng.fill_bytes(&mut result);
result
}
}
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/// Generate a random string of given length.
pub fn random_string(length: usize) -> String {
let mut rng = OsRng::new().expect("Not able to operate without random source.");
rng.gen_ascii_chars().take(length).collect()
}