| Joel Galenson | 4be0c6d | 2020-07-07 13:20:14 -0700 | [diff] [blame^] | 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 | } |