| // 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(()) |
| } |
