Update nitrokey crate to 0.4.0

This change finally updates the version of the nitrokey crate that we
consume to 0.4.0. Along with that we update rand_core, one of its
dependencies, to 0.5.1. Further more we add cfg-if in version 0.1.10 and
getrandom in version 0.1.13, both of which are now new (non-development)
dependencies.

Import subrepo nitrokey/:nitrokey at e81057037e9b4f370b64c0a030a725bc6bdfb870
Import subrepo cfg-if/:cfg-if at 4484a6faf816ff8058088ad857b0c6bb2f4b02b2
Import subrepo getrandom/:getrandom at d661aa7e1b8cc80b47dabe3d2135b3b47d2858af
Import subrepo rand/:rand at d877ed528248b52d947e0484364a4e1ae59ca502

1 files changed, 19 insertions, 0 deletions

diff --git a/getrandom/src/wasi.rs b/getrandom/src/wasi.rs
new file mode 100644
index 0000000..713c1ab
--- /dev/null
+++ b/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;
+use wasi::wasi_unstable::random_get;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    random_get(dest).map_err(|e: num::NonZeroU16| {
+        // convert wasi's NonZeroU16 error into getrandom's NonZeroU32 error
+        num::NonZeroU32::new(e.get() as u32).unwrap().into()
+    })
+}