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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 Windows
extern crate winapi;
use rand_core::{Error, ErrorKind};
use super::OsRngImpl;
use std::io;
use self::winapi::shared::minwindef::ULONG;
use self::winapi::um::ntsecapi::RtlGenRandom;
use self::winapi::um::winnt::PVOID;
#[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 ret = unsafe {
RtlGenRandom(dest.as_mut_ptr() as PVOID, dest.len() as ULONG)
};
if ret == 0 {
return Err(Error::with_cause(
ErrorKind::Unavailable,
"couldn't generate random bytes",
io::Error::last_os_error()));
}
Ok(())
}
fn max_chunk_size(&self) -> usize { <ULONG>::max_value() as usize }
fn method_str(&self) -> &'static str { "RtlGenRandom" }
}
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