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, 3 insertions, 4 deletions

diff --git a/rand/rand_xoshiro/src/splitmix64.rs b/rand/rand_xoshiro/src/splitmix64.rs
index a7cac9f..3a41450 100644
--- a/rand/rand_xoshiro/src/splitmix64.rs
+++ b/rand/rand_xoshiro/src/splitmix64.rs
@@ -6,7 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use byteorder::{ByteOrder, LittleEndian};
+#[cfg(feature="serde1")] use serde::{Serialize, Deserialize};
 use rand_core::le::read_u64_into;
 use rand_core::impls::fill_bytes_via_next;
 use rand_core::{RngCore, SeedableRng, Error};
@@ -22,6 +22,7 @@ use rand_core::{RngCore, SeedableRng, Error};
 /// from [`dsiutils`](http://dsiutils.di.unimi.it/) is used.
 #[allow(missing_copy_implementations)]
 #[derive(Debug, Clone)]
+#[cfg_attr(feature="serde1", derive(Serialize, Deserialize))]
 pub struct SplitMix64 {
     x: u64,
 }
@@ -77,9 +78,7 @@ impl SeedableRng for SplitMix64 {
 
     /// Seed a `SplitMix64` from a `u64`.
     fn seed_from_u64(seed: u64) -> SplitMix64 {
-        let mut x = [0; 8];
-        LittleEndian::write_u64(&mut x, seed);
-        SplitMix64::from_seed(x)
+        SplitMix64::from_seed(seed.to_le_bytes())
     }
 }