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1 | // Copyright 2018 Developers of the Rand project. |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
4 | // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
5 | // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | |
6 | // option. This file may not be copied, modified, or distributed | |
7 | // except according to those terms. | |
8 | ||
9 | //! Implementation for Windows | |
10 | use crate::{error::RTL_GEN_RANDOM_FAILED, Error}; | |
11 | ||
12 | extern "system" { | |
13 | #[link_name = "SystemFunction036"] | |
14 | fn RtlGenRandom(RandomBuffer: *mut u8, RandomBufferLength: u32) -> u8; | |
15 | } | |
16 | ||
17 | pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { | |
18 | // Prevent overflow of u32 | |
19 | for chunk in dest.chunks_mut(u32::max_value() as usize) { | |
20 | let ret = unsafe { RtlGenRandom(chunk.as_mut_ptr(), chunk.len() as u32) }; | |
21 | if ret == 0 { | |
22 | return Err(RTL_GEN_RANDOM_FAILED); | |
23 | } | |
24 | } | |
25 | Ok(()) | |
26 | } |