Update nitrokey crate to 0.2.3

This change updates the nitrokey crate to version 0.2.3. This version
bumps the rand crate used to 0.6.1, which in turn requires an additional
set of dependencies.

Import subrepo nitrokey/:nitrokey at b3e2adc5bb1300441ca74cc7672617c042f3ea31
Import subrepo rand/:rand at 73613ff903512e9503e41cc8ba9eae76269dc598
Import subrepo rustc_version/:rustc_version at 0294f2ba2018bf7be672abd53db351ce5055fa02
Import subrepo semver-parser/:semver-parser at 750da9b11a04125231b1fb293866ca036845acee
Import subrepo semver/:semver at 5eb6db94fa03f4d5c64a625a56188f496be47598

1 files changed, 81 insertions, 0 deletions

diff --git a/rand/src/rngs/std.rs b/rand/src/rngs/std.rs
new file mode 100644
index 0000000..ce1658b
--- /dev/null
+++ b/rand/src/rngs/std.rs
@@ -0,0 +1,81 @@
+// 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.
+
+//! The standard RNG
+
+use {RngCore, CryptoRng, Error, SeedableRng};
+use rand_hc::Hc128Rng;
+
+/// The standard RNG. The PRNG algorithm in `StdRng` is chosen to be efficient
+/// on the current platform, to be statistically strong and unpredictable
+/// (meaning a cryptographically secure PRNG).
+///
+/// The current algorithm used on all platforms is [HC-128].
+///
+/// Reproducibility of output from this generator is however not required, thus
+/// future library versions may use a different internal generator with
+/// different output. Further, this generator may not be portable and can
+/// produce different output depending on the architecture. If you require
+/// reproducible output, use a named RNG, for example [`ChaChaRng`].
+///
+/// [HC-128]: ../../rand_hc/struct.Hc128Rng.html
+/// [`ChaChaRng`]: ../../rand_chacha/struct.ChaChaRng.html
+#[derive(Clone, Debug)]
+pub struct StdRng(Hc128Rng);
+
+impl RngCore for StdRng {
+    #[inline(always)]
+    fn next_u32(&mut self) -> u32 {
+        self.0.next_u32()
+    }
+
+    #[inline(always)]
+    fn next_u64(&mut self) -> u64 {
+        self.0.next_u64()
+    }
+
+    fn fill_bytes(&mut self, dest: &mut [u8]) {
+        self.0.fill_bytes(dest);
+    }
+
+    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+        self.0.try_fill_bytes(dest)
+    }
+}
+
+impl SeedableRng for StdRng {
+    type Seed = <Hc128Rng as SeedableRng>::Seed;
+
+    fn from_seed(seed: Self::Seed) -> Self {
+        StdRng(Hc128Rng::from_seed(seed))
+    }
+
+    fn from_rng<R: RngCore>(rng: R) -> Result<Self, Error> {
+        Hc128Rng::from_rng(rng).map(StdRng)
+    }
+}
+
+impl CryptoRng for StdRng {}
+
+
+#[cfg(test)]
+mod test {
+    use {RngCore, SeedableRng};
+    use rngs::StdRng;
+
+    #[test]
+    fn test_stdrng_construction() {
+        let seed = [1,0,0,0, 23,0,0,0, 200,1,0,0, 210,30,0,0,
+                    0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0];
+        let mut rng1 = StdRng::from_seed(seed);
+        assert_eq!(rng1.next_u64(), 15759097995037006553);
+
+        let mut rng2 = StdRng::from_rng(rng1).unwrap();
+        assert_eq!(rng2.next_u64(), 6766915756997287454);
+    }
+}