1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// 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 FreeBSD
extern crate libc;
use rand_core::{Error, ErrorKind};
use super::OsRngImpl;
use std::ptr;
use std::io;
#[derive(Clone, Debug)]
pub struct OsRng;
impl OsRngImpl for OsRng {
fn new() -> Result<OsRng, Error> { Ok(OsRng) }
fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
let mib = [libc::CTL_KERN, libc::KERN_ARND];
let mut len = dest.len();
let ret = unsafe {
libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint,
dest.as_mut_ptr() as *mut _, &mut len,
ptr::null(), 0)
};
if ret == -1 || len != dest.len() {
return Err(Error::with_cause(
ErrorKind::Unavailable,
"kern.arandom sysctl failed",
io::Error::last_os_error()));
}
Ok(())
}
fn max_chunk_size(&self) -> usize { 256 }
fn method_str(&self) -> &'static str { "kern.arandom" }
}
|
