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
let mut bytes = [0_u8; 32]; spinoso_random::urandom(&mut bytes)?; assert!(!bytes.iter().all(|&b| b == 0));
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