1 files changed, 19 insertions, 0 deletions
diff --git a/third_party/rust/getrandom/src/wasi.rs b/third_party/rust/getrandom/src/wasi.rs
new file mode 100644
index 0000000000..4674f43960
--- /dev/null
+++ b/third_party/rust/getrandom/src/wasi.rs
@@ -0,0 +1,19 @@
+// 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 WASI
+use crate::Error;
+use core::num::NonZeroU32;
+use wasi::random_get;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    unsafe { random_get(dest.as_mut_ptr(), dest.len()) }.map_err(|e: wasi::Error| {
+        // convert wasi's Error into getrandom's NonZeroU32 error
+        NonZeroU32::new(e.raw_error() as u32).unwrap().into()
+    })
+}