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// Test that a custom handler works on wasm32-unknown-unknown
#![cfg(all(
target_arch = "wasm32",
target_os = "unknown",
feature = "custom",
not(feature = "js")
))]
use wasm_bindgen_test::wasm_bindgen_test as test;
use core::num::NonZeroU32;
use getrandom::{getrandom, register_custom_getrandom, Error};
fn len7_err() -> Error {
NonZeroU32::new(Error::INTERNAL_START + 7).unwrap().into()
}
fn super_insecure_rng(buf: &mut [u8]) -> Result<(), Error> {
// `getrandom` guarantees it will not call any implementation if the output
// buffer is empty.
assert!(!buf.is_empty());
// Length 7 buffers return a custom error
if buf.len() == 7 {
return Err(len7_err());
}
// Otherwise, fill bytes based on input length
let mut start = buf.len() as u8;
for b in buf {
*b = start;
start = start.wrapping_mul(3);
}
Ok(())
}
register_custom_getrandom!(super_insecure_rng);
use getrandom::getrandom as getrandom_impl;
mod common;
#[test]
fn custom_rng_output() {
let mut buf = [0u8; 4];
assert_eq!(getrandom(&mut buf), Ok(()));
assert_eq!(buf, [4, 12, 36, 108]);
let mut buf = [0u8; 3];
assert_eq!(getrandom(&mut buf), Ok(()));
assert_eq!(buf, [3, 9, 27]);
}
#[test]
fn rng_err_output() {
assert_eq!(getrandom(&mut [0; 7]), Err(len7_err()));
}