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, 25 insertions, 0 deletions

diff --git a/getrandom/src/cloudabi.rs b/getrandom/src/cloudabi.rs
new file mode 100644
index 0000000..d3d0928
--- /dev/null
+++ b/getrandom/src/cloudabi.rs
@@ -0,0 +1,25 @@
+// 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 CloudABI
+use crate::Error;
+use core::num::NonZeroU32;
+
+extern "C" {
+    fn cloudabi_sys_random_get(buf: *mut u8, buf_len: usize) -> u16;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    let errno = unsafe { cloudabi_sys_random_get(dest.as_mut_ptr(), dest.len()) };
+    if let Some(code) = NonZeroU32::new(errno as u32) {
+        error!("cloudabi_sys_random_get: failed with {}", errno);
+        Err(Error::from(code))
+    } else {
+        Ok(()) // Zero means success for CloudABI
+    }
+}