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, 30 insertions, 44 deletions

diff --git a/rand/src/prng/mod.rs b/rand/src/prng/mod.rs
index ed3e018..3c0d27b 100644
--- a/rand/src/prng/mod.rs
+++ b/rand/src/prng/mod.rs
@@ -1,51 +1,37 @@
-// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
+// Copyright 2018 Developers of the Rand project.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// 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.
 
-//! Pseudo random number generators are algorithms to produce *apparently
-//! random* numbers deterministically, and usually fairly quickly.
+//! Pseudo-random number generators.
+//!
+//! This module is deprecated:
 //! 
-//! So long as the algorithm is computationally secure, is initialised with
-//! sufficient entropy (i.e. unknown by an attacker), and its internal state is
-//! also protected (unknown to an attacker), the output will also be
-//! *computationally secure*. Computationally Secure Pseudo Random Number
-//! Generators (CSPRNGs) are thus suitable sources of random numbers for
-//! cryptography. There are a couple of gotchas here, however. First, the seed
-//! used for initialisation must be unknown. Usually this should be provided by
-//! the operating system and should usually be secure, however this may not
-//! always be the case (especially soon after startup). Second, user-space
-//! memory may be vulnerable, for example when written to swap space, and after
-//! forking a child process should reinitialise any user-space PRNGs. For this
-//! reason it may be preferable to source random numbers directly from the OS
-//! for cryptographic applications.
-//! 
-//! PRNGs are also widely used for non-cryptographic uses: randomised
-//! algorithms, simulations, games. In these applications it is usually not
-//! important for numbers to be cryptographically *unguessable*, but even
-//! distribution and independence from other samples (from the point of view
-//! of someone unaware of the algorithm used, at least) may still be important.
-//! Good PRNGs should satisfy these properties, but do not take them for
-//! granted; Wikipedia's article on 
-//! [Pseudorandom number generators](https://en.wikipedia.org/wiki/Pseudorandom_number_generator)
-//! provides some background on this topic.
-//! 
-//! Care should be taken when seeding (initialising) PRNGs. Some PRNGs have
-//! short periods for some seeds. If one PRNG is seeded from another using the
-//! same algorithm, it is possible that both will yield the same sequence of
-//! values (with some lag).
-
-mod chacha;
-mod isaac;
-mod isaac64;
-mod xorshift;
+//! -   documentation has moved to
+//!     [The Book](https://rust-random.github.io/book/guide-rngs.html),
+//! -   PRNGs have moved to other `rand_*` crates.
 
-pub use self::chacha::ChaChaRng;
-pub use self::isaac::IsaacRng;
-pub use self::isaac64::Isaac64Rng;
-pub use self::xorshift::XorShiftRng;
+// Deprecations (to be removed in 0.7)
+#[doc(hidden)] #[allow(deprecated)]
+pub use deprecated::XorShiftRng;
+#[doc(hidden)] pub mod isaac {
+    // Note: we miss `IsaacCore` here but probably unimportant.
+    #[allow(deprecated)] pub use deprecated::IsaacRng;
+}
+#[doc(hidden)] pub mod isaac64 {
+    #[allow(deprecated)] pub use deprecated::Isaac64Rng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::{IsaacRng, Isaac64Rng};
+#[doc(hidden)] pub mod chacha {
+    // Note: we miss `ChaChaCore` here but probably unimportant.
+    #[allow(deprecated)] pub use deprecated::ChaChaRng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::ChaChaRng;
+#[doc(hidden)] pub mod hc128 {
+    // Note: we miss `Hc128Core` here but probably unimportant.
+    #[allow(deprecated)] pub use deprecated::Hc128Rng;
+}
+#[doc(hidden)] #[allow(deprecated)] pub use deprecated::Hc128Rng;