Struct rand::chacha::ChaChaRng

pub struct ChaChaRng {
    // some fields omitted
}

A random number generator that uses the ChaCha20 algorithm [1].

The ChaCha algorithm is widely accepted as suitable for cryptographic purposes, but this implementation has not been verified as such. Prefer a generator like OsRng that defers to the operating system for cases that need high security.

[1]: D. J. Bernstein, ChaCha, a variant of Salsa20

Methods

impl ChaChaRng

fn new_unseeded() -> ChaChaRng

Create an ChaCha random number generator using the default fixed key of 8 zero words.

fn set_counter(&mut self, counter_low: u64, counter_high: u64)

Sets the internal 128-bit ChaCha counter to a user-provided value. This permits jumping arbitrarily ahead (or backwards) in the pseudorandom stream.

Since the nonce words are used to extend the counter to 128 bits, users wishing to obtain the conventional ChaCha pseudorandom stream associated with a particular nonce can call this function with arguments 0, desired_nonce.

Trait Implementations

impl Rng for ChaChaRng

fn next_u32(&mut self) -> u32

fn next_u64(&mut self) -> u64

fn next_f32(&mut self) -> f32

fn next_f64(&mut self) -> f64

fn fill_bytes(&mut self, dest: &mut [u8])

fn gen<T: Rand>(&mut self) -> T

fn gen_iter<'a, T: Rand>(&'a mut self) -> Generator<'a, T, Self>

fn gen_range<T: PartialOrd + SampleRange>(&mut self, low: T, high: T) -> T

fn gen_weighted_bool(&mut self, n: u32) -> bool

fn gen_ascii_chars<'a>(&'a mut self) -> AsciiGenerator<'a, Self>

fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T>

fn shuffle<T>(&mut self, values: &mut [T])

impl<'a> SeedableRng<&'a [u32]> for ChaChaRng

fn reseed(&mut self, seed: &'a [u32])

fn from_seed(seed: &'a [u32]) -> ChaChaRng

impl Rand for ChaChaRng

fn rand<R: Rng>(other: &mut R) -> ChaChaRng

Derived Implementations

impl Clone for ChaChaRng

fn clone(&self) -> ChaChaRng

fn clone_from(&mut self, source: &Self)

impl Copy for ChaChaRng