Nonce Window

Implementation of Anti-Replay Algorithm without Bit Shifting based on RFC 6479. Number of blocks is not necessarily a power of two.

Examples

use nonce_window::SlidingWindow;

let mut window = SlidingWindow::<u64, u64>::new(64);

assert_eq!((), window.update(5).unwrap());
window.update(5).unwrap_err(); // reuse

assert_eq!((), window.update(20).unwrap());
assert_eq!((), window.update(4).unwrap());
window.update(4).unwrap_err(); // reuse

assert_eq!((), window.update(128).unwrap()); // advance window
let _unused_result = window.update(10); // may or may not return an error
window.update(10).unwrap_err(); // reuse

• A nonce will be accepted if it is not less than the highest accepted nonce minus minimum_sliding_window_size AND it has not been accepted before
• A nonce will be rejected if it has been accepted before
• A nonce that has not been accepted before AND is less than the highest accepted nonce minus minimum_sliding_window_size MAY be rejected