1 files changed, 23 insertions, 0 deletions
diff --git a/vendor/getrandom/src/wasi.rs b/vendor/getrandom/src/wasi.rs
new file mode 100644
index 000000000..2d413e020
--- /dev/null
+++ b/vendor/getrandom/src/wasi.rs
@@ -0,0 +1,23 @@
+// 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
+            // SAFETY: `wasi::Error` is `NonZeroU16` internally, so `e.raw_error()`
+            // will never return 0
+            NonZeroU32::new_unchecked(e.raw_error() as u32).into()
+        })
+    }
+}