pub fn urandom(dest: &mut [u8]) -> Result<(), UrandomError>Expand description
Read random bytes, using platform-provided randomness.
dest is completely filled with bytes that are expected to be a
cryptographically secure pseudo-random number in binary form.
In 2017, Linux manpage random(7) writes that “no cryptographic primitive
available today can hope to promise more than 256 bits of security”. So it
might be questionable to pass a slice where dest.len() > 32 to this
method.
§Examples
use spinoso_random::Error;
let mut bytes = [0_u8; 32];
spinoso_random::urandom(&mut bytes)?;
assert!(!bytes.iter().all(|&b| b == 0));§Errors
If the randomness feature provided by the platform is not present or failed
to completely fill dest, an error is returned. This error should be raised
as a Ruby RuntimeError.