1 // Copyright 2015-2019 Brian Smith.
2 //
3 // Permission to use, copy, modify, and/or distribute this software for any
4 // purpose with or without fee is hereby granted, provided that the above
5 // copyright notice and this permission notice appear in all copies.
6 //
7 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
10 // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15 use ring::{
16 rand::{self, SecureRandom as _},
17 test,
18 };
19
20 #[cfg(target_arch = "wasm32")]
21 use wasm_bindgen_test::{wasm_bindgen_test, wasm_bindgen_test_configure};
22
23 #[cfg(target_arch = "wasm32")]
24 wasm_bindgen_test_configure!(run_in_browser);
25
26 #[test]
27 #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
test_system_random_lengths()28 fn test_system_random_lengths() {
29 const LINUX_LIMIT: usize = 256;
30 const WEB_LIMIT: usize = 65536;
31
32 // Test that `fill` succeeds for various interesting lengths. `256` and
33 // multiples thereof are interesting because that's an edge case for
34 // `getrandom` on Linux.
35 let lengths = [
36 0,
37 1,
38 2,
39 3,
40 96,
41 LINUX_LIMIT - 1,
42 LINUX_LIMIT,
43 LINUX_LIMIT + 1,
44 LINUX_LIMIT * 2,
45 511,
46 512,
47 513,
48 4096,
49 WEB_LIMIT - 1,
50 WEB_LIMIT,
51 WEB_LIMIT + 1,
52 WEB_LIMIT * 2,
53 ];
54
55 for len in lengths.iter() {
56 let mut buf = vec![0; *len];
57
58 let rng = rand::SystemRandom::new();
59 assert!(rng.fill(&mut buf).is_ok());
60
61 // If `len` < 96 then there's a big chance of false positives, but
62 // otherwise the likelihood of a false positive is so too low to
63 // worry about.
64 if *len >= 96 {
65 assert!(buf.iter().any(|x| *x != 0));
66 }
67 }
68 }
69
70 #[test]
71 #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
test_system_random_traits()72 fn test_system_random_traits() {
73 test::compile_time_assert_clone::<rand::SystemRandom>();
74 test::compile_time_assert_send::<rand::SystemRandom>();
75
76 assert_eq!(
77 "SystemRandom(())",
78 format!("{:?}", rand::SystemRandom::new())
79 );
80 }
81