Trait Variant 

pub trait Variant: Sealed {
    type Counter: Copy;

    // Required methods
    fn get_block_pos(row: &[u32]) -> Self::Counter;
    fn set_block_pos(row: &mut [u32], pos: Self::Counter);
    fn remaining_blocks(block_pos: Self::Counter) -> Option<usize>;
}

A trait that distinguishes some ChaCha variants. Contains configurations for “Legacy” DJB variant and the IETF variant.

Required Associated Types

type Counter: Copy

The counter’s type.

Required Methods

fn get_block_pos(row: &[u32]) -> Self::Counter

Takes a slice of state[12..NONCE_INDEX] to convert it into Self::Counter.

fn set_block_pos(row: &mut [u32], pos: Self::Counter)

Breaks down the Self::Counter type into a u32 array for setting the block pos.

fn remaining_blocks(block_pos: Self::Counter) -> Option<usize>

A helper method for calculating the remaining blocks using these types

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Variant for Ietf

type Counter = u32

impl Variant for Legacy

Available on crate features legacy or rng only.

type Counter = u64