Struct MessageCounter

pub struct MessageCounter { /* private fields */ }

A cryptographic counter for verifying message order.

To verify that messages arrive in the correct order and aren’t reused at a later time, you can use a cryptographic counter. It is essentially a PRNG that always returns a single byte. Similarly to a PRNG, we need to provide a seed before we can generate values.

let mut counter = MessageCounter::new(random::<u32>());
let first = counter.next_byte();
let second = counter.next_byte();
assert_ne!(first, second);

Implementations

impl MessageCounter

pub fn new(seed: u32) -> MessageCounter

Creates a new counter with the given seed.

pub fn next_byte(&mut self) -> u8

Generates the next byte of the counter.

Generates the next byte by advancing the internal state according to the generation algorithm.