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// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Implementation for NetBSD
use rand_core::Error;
use super::random_device;
use super::OsRngImpl;
use std::fs::File;
use std::io::Read;
use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
#[derive(Clone, Debug)]
pub struct OsRng { initialized: bool }
impl OsRngImpl for OsRng {
fn new() -> Result<OsRng, Error> {
random_device::open("/dev/urandom", &|p| File::open(p))?;
Ok(OsRng { initialized: false })
}
fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
random_device::read(dest)
}
// Read a single byte from `/dev/random` to determine if the OS RNG is
// already seeded. NetBSD always blocks if not yet ready.
fn test_initialized(&mut self, dest: &mut [u8], _blocking: bool)
-> Result<usize, Error>
{
static OS_RNG_INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
if !self.initialized {
self.initialized = OS_RNG_INITIALIZED.load(Ordering::Relaxed);
}
if self.initialized { return Ok(0); }
info!("OsRng: testing random device /dev/random");
let mut file =
File::open("/dev/random").map_err(random_device::map_err)?;
file.read(&mut dest[..1]).map_err(random_device::map_err)?;
OS_RNG_INITIALIZED.store(true, Ordering::Relaxed);
self.initialized = true;
Ok(1)
}
fn method_str(&self) -> &'static str { "/dev/urandom" }
}
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