Import getrandom-0.1.14
Change-Id: I2e27b76bb8b37119712eeda01f94641a77cce5fd
diff --git a/src/windows.rs b/src/windows.rs
new file mode 100644
index 0000000..e1b8df6
--- /dev/null
+++ b/src/windows.rs
@@ -0,0 +1,26 @@
+// 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(())
+}