Struct ChaChaRng 

pub struct ChaChaRng { /* private fields */ }

ChaCha20-based CSPRNG state. Wraps rand_chacha::ChaCha20Rng and exposes the same TryRng / SeedableRng surface as the other vrd backends.

Examples

use vrd::chacha::ChaChaRng;

let mut rng = ChaChaRng::from_seed([0u8; 32]);
let _ = rng.next_u32();

Implementations

impl ChaChaRng

pub fn from_seed(seed: [u8; 32]) -> Self

Builds a CSPRNG from a deterministic 32-byte seed. Use this for reproducible tests; use Self::from_os_rng for real crypto-quality randomness.

Examples

use vrd::chacha::ChaChaRng;

let mut rng = ChaChaRng::from_seed([1u8; 32]);
assert_ne!(rng.next_u64(), 0);

pub fn from_os_rng() -> Self

Seeds the CSPRNG from the operating system entropy source. Requires std.

Examples

use vrd::chacha::ChaChaRng;

let mut rng = ChaChaRng::from_os_rng();
let _ = rng.next_u32();

pub fn next_u32(&mut self) -> u32

Generates the next random u32.

pub fn next_u64(&mut self) -> u64

Generates the next random u64.

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

Fills dest with CSPRNG-grade random bytes.

Trait Implementations

impl Clone for ChaChaRng

fn clone(&self) -> ChaChaRng

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChaChaRng

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ChaChaRng

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ChaChaRng

fn eq(&self, other: &ChaChaRng) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl SeedableRng for ChaChaRng

type Seed = [u8; 32]

Seed type, which is restricted to types mutably-dereferenceable as u8 arrays (we recommend [u8; N] for some N).

fn from_seed(seed: [u8; 32]) -> Self

Create a new PRNG using the given seed.

fn seed_from_u64(state: u64) -> Self

Create a new PRNG using a u64 seed.

fn from_rng<R>(rng: &mut R) -> Self

where R: Rng + ?Sized,

Create a new PRNG seeded from an infallible Rng.

fn try_from_rng<R>(rng: &mut R) -> Result<Self, <R as TryRng>::Error>

where R: TryRng + ?Sized,

Create a new PRNG seeded from a potentially fallible Rng.

fn fork(&mut self) -> Self

where Self: Rng,

Fork this PRNG

fn try_fork(&mut self) -> Result<Self, Self::Error>

where Self: TryRng,

Fork this PRNG

impl Serialize for ChaChaRng

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryRng for ChaChaRng

type Error = Infallible

The type returned in the event of a RNG error.

fn try_next_u32(&mut self) -> Result<u32, Self::Error>

Return the next random u32.

fn try_next_u64(&mut self) -> Result<u64, Self::Error>

Return the next random u64.

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Self::Error>

Fill dst entirely with random data.

impl Eq for ChaChaRng

impl StructuralPartialEq for ChaChaRng