1 files changed, 43 insertions, 0 deletions
diff --git a/rand/rand_os/src/fuchsia.rs b/rand/rand_os/src/fuchsia.rs
new file mode 100644
index 0000000..7063ff6
--- /dev/null
+++ b/rand/rand_os/src/fuchsia.rs
@@ -0,0 +1,43 @@
+// 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 Fuchsia Zircon
+
+extern crate fuchsia_zircon;
+
+use rand_core::{Error, ErrorKind};
+use super::OsRngImpl;
+
+#[derive(Clone, Debug)]
+pub struct OsRng;
+
+impl OsRngImpl for OsRng {
+    fn new() -> Result<OsRng, Error> { Ok(OsRng) }
+
+    fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+        let mut read = 0;
+        while read < dest.len() {
+            match fuchsia_zircon::cprng_draw(&mut dest[read..]) {
+                Ok(actual) => read += actual,
+                Err(e) => {
+                    return Err(Error::with_cause(
+                        ErrorKind::Unavailable,
+                        "cprng_draw failed",
+                        e.into_io_error()));
+                }
+            };
+        }
+        Ok(())
+    }
+
+    fn max_chunk_size(&self) -> usize {
+        fuchsia_zircon::sys::ZX_CPRNG_DRAW_MAX_LEN
+    }
+
+    fn method_str(&self) -> &'static str { "cprng_draw" }
+}