pub struct OsRng;
Expand description
A random number generator that retrieves randomness from the operating system.
This is a zero-sized struct. It can be freely constructed with OsRng
.
The implementation is provided by the getrandom crate. Refer to getrandom documentation for details.
This struct is only available when specifying the crate feature getrandom
or std
. When using the rand
lib, it is also available as rand::rngs::OsRng
.
Blocking and error handling
It is possible that when used during early boot the first call to OsRng
will block until the system’s RNG is initialised. It is also possible
(though highly unlikely) for OsRng
to fail on some platforms, most
likely due to system mis-configuration.
After the first successful call, it is highly unlikely that failures or significant delays will occur (although performance should be expected to be much slower than a user-space PRNG).
Usage example
use rand_core::{RngCore, OsRng};
let mut key = [0u8; 16];
OsRng.fill_bytes(&mut key);
let random_u64 = OsRng.next_u64();
Trait Implementations
sourceimpl RngCore for OsRng
impl RngCore for OsRng
sourcefn fill_bytes(&mut self, dest: &mut [u8])
fn fill_bytes(&mut self, dest: &mut [u8])
Fill dest
with random data. Read more
impl Copy for OsRng
impl CryptoRng for OsRng
Auto Trait Implementations
impl RefUnwindSafe for OsRng
impl Send for OsRng
impl Sync for OsRng
impl Unpin for OsRng
impl UnwindSafe for OsRng
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more