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// Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use io::{self, Error, ErrorKind};
use mem;
use rand::Rng;
use libctru::{sslcInit, sslcExit, sslcGenerateRandomData};
pub struct OsRng(());
impl OsRng {
pub fn new() -> io::Result<OsRng> {
unsafe {
let r = sslcInit(0);
if r < 0 {
Err(Error::new(ErrorKind::Other, "Unable to initialize the RNG"))
} else {
Ok(OsRng(()))
}
}
}
}
impl Rng for OsRng {
fn next_u32(&mut self) -> u32 {
let mut v = [0; 4];
self.fill_bytes(&mut v);
unsafe { mem::transmute(v) }
}
fn next_u64(&mut self) -> u64 {
let mut v = [0; 8];
self.fill_bytes(&mut v);
unsafe { mem::transmute(v) }
}
fn fill_bytes(&mut self, v: &mut [u8]) {
unsafe { sslcGenerateRandomData(v.as_ptr() as _, v.len() as u32); }
}
}
impl Drop for OsRng {
fn drop(&mut self) {
unsafe { sslcExit() }
}
}
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