pub struct ChaChaRng { /* private fields */ }
Expand description

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

Implementations

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

Examples
use sgx_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

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 sgx_rand::{Rng, ChaChaRng};

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

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Generates a random instance of this type using the specified source of randomness. Read more
Return the next random u32. Read more
Return the next random u64. Read more
Return the next random f32 selected from the half-open interval [0, 1). Read more
Return the next random f64 selected from the half-open interval [0, 1). Read more
Fill dest with random data. Read more
Return a random value of a Rand type. Read more
Return an iterator that will yield an infinite number of randomly generated items. Read more
Generate a random value in the range [low, high). Read more
Return a bool with a 1 in n chance of true Read more
Return an iterator of random characters from the set A-Z,a-z,0-9. Read more
Return a random element from values. Read more
Return a mutable pointer to a random element from values. Read more
Shuffle a mutable slice in place. Read more

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.

Reseed an RNG with the given seed. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.