Struct rand::chacha::ChaChaRng [] [src]

pub struct ChaChaRng { /* 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
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Create an ChaCha random number generator using the default fixed key of 8 zero words.

Examples

use rand::{Rng, ChaChaRng};

let mut ra = ChaChaRng::new_unseeded();
println!("{:?}", ra.next_u32());
println!("{:?}", ra.next_u32());

Since this equivalent to a RNG with a fixed seed, repeated executions of an unseeded RNG will produce the same result. This code sample will consistently produce:

  • 2917185654
  • 2419978656

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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.

Examples

use rand::{Rng, ChaChaRng};

let mut ra = ChaChaRng::new_unseeded();
ra.set_counter(0u64, 1234567890u64);
println!("{:?}", ra.next_u32());
println!("{:?}", ra.next_u32());

Trait Implementations

impl Rng for ChaChaRng
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Return the next random u32. Read more

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Return the next random u64. Read more

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Return the next random f32 selected from the half-open interval [0, 1). Read more

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Return the next random f64 selected from the half-open interval [0, 1). Read more

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Fill dest with random data. Read more

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Return a random value of a Rand type. Read more

Important traits for Generator<'a, T, R>
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Return an iterator that will yield an infinite number of randomly generated items. Read more

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Generate a random value in the range [low, high). Read more

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Return a bool with a 1 in n chance of true Read more

Important traits for AsciiGenerator<'a, R>
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Return an iterator of random characters from the set A-Z,a-z,0-9. Read more

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Return a random element from values. Read more

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Return a mutable pointer to a random element from values. Read more

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Shuffle a mutable slice in place. Read more

impl Debug for ChaChaRng
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Formats the value using the given formatter. Read more

impl Copy for ChaChaRng
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impl Clone for ChaChaRng
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl Rand for ChaChaRng
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Generates a random instance of this type using the specified source of randomness. Read more

impl<'a> SeedableRng<&'a [u32]> for ChaChaRng
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Reseed an RNG with the given seed. Read more

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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.