Function getrandom::getrandom

pub fn getrandom(dest: &mut [u8]) -> Result<(), Error>

Fill dest with random bytes from the system’s preferred random number source.

This function returns an error on any failure, including partial reads. We make no guarantees regarding the contents of dest on error. If dest is empty, getrandom immediately returns success, making no calls to the underlying operating system.

Blocking is possible, at least during early boot; see module documentation.

In general, getrandom will be fast enough for interactive usage, though significantly slower than a user-space CSPRNG; for the latter consider rand::thread_rng.