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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
use crate::{error::RTL_GEN_RANDOM_FAILED, Error};
extern "system" {
#[link_name = "SystemFunction036"]
fn RtlGenRandom(RandomBuffer: *mut u8, RandomBufferLength: u32) -> u8;
}
pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
// Prevent overflow of u32
for chunk in dest.chunks_mut(u32::max_value() as usize) {
let ret = unsafe { RtlGenRandom(chunk.as_mut_ptr(), chunk.len() as u32) };
if ret == 0 {
return Err(RTL_GEN_RANDOM_FAILED);
}
}
Ok(())
}
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