Struct rand::chacha::ChaChaRng
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[src]
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: usize) -> 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
Create a ChaCha generator from a seed, obtained from a variable-length u32 array. Only up to 8 words are used; if less than 8 words are used, the remaining are set to zero.