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, 68 insertions, 0 deletions

diff --git a/getrandom/tests/common.rs b/getrandom/tests/common.rs
new file mode 100644
index 0000000..afefa03
--- /dev/null
+++ b/getrandom/tests/common.rs
@@ -0,0 +1,68 @@
+#[cfg(feature = "wasm-bindgen")]
+use wasm_bindgen_test::*;
+
+use getrandom::getrandom;
+
+#[cfg(feature = "test-in-browser")]
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[cfg_attr(feature = "wasm-bindgen", wasm_bindgen_test)]
+#[test]
+fn test_zero() {
+    // Test that APIs are happy with zero-length requests
+    getrandom(&mut [0u8; 0]).unwrap();
+}
+
+#[cfg_attr(feature = "wasm-bindgen", wasm_bindgen_test)]
+#[test]
+fn test_diff() {
+    let mut v1 = [0u8; 1000];
+    getrandom(&mut v1).unwrap();
+
+    let mut v2 = [0u8; 1000];
+    getrandom(&mut v2).unwrap();
+
+    let mut n_diff_bits = 0;
+    for i in 0..v1.len() {
+        n_diff_bits += (v1[i] ^ v2[i]).count_ones();
+    }
+
+    // Check at least 1 bit per byte differs. p(failure) < 1e-1000 with random input.
+    assert!(n_diff_bits >= v1.len() as u32);
+}
+
+#[cfg_attr(feature = "wasm-bindgen", wasm_bindgen_test)]
+#[test]
+fn test_huge() {
+    let mut huge = [0u8; 100_000];
+    getrandom(&mut huge).unwrap();
+}
+
+#[cfg(any(unix, windows, target_os = "redox", target_os = "fuchsia"))]
+#[test]
+fn test_multithreading() {
+    use std::sync::mpsc::channel;
+    use std::thread;
+
+    let mut txs = vec![];
+    for _ in 0..20 {
+        let (tx, rx) = channel();
+        txs.push(tx);
+
+        thread::spawn(move || {
+            // wait until all the tasks are ready to go.
+            rx.recv().unwrap();
+            let mut v = [0u8; 1000];
+
+            for _ in 0..100 {
+                getrandom(&mut v).unwrap();
+                thread::yield_now();
+            }
+        });
+    }
+
+    // start all the tasks
+    for tx in txs.iter() {
+        tx.send(()).unwrap();
+    }
+}