Crate ctr

Generic implementation of CTR mode for block cipher with 128-bit block size.

Mode functionality is accessed using traits from re-exported stream-cipher crate.

Warning

This crate does not provide any authentification! Thus ciphertext integrity is not verified, which can lead to serious vulnerabilities!

Usage example

// `aes` crate provides AES block cipher implementation
extern crate aes;
extern crate ctr;

use ctr::stream_cipher::generic_array::GenericArray;
use ctr::stream_cipher::{
    NewStreamCipher, SyncStreamCipher, SyncStreamCipherSeek
};

type Aes128Ctr = ctr::Ctr128<aes::Aes128>;

let mut data = [1, 2, 3, 4, 5, 6, 7];

let key = GenericArray::from_slice(b"very secret key.");
let nonce = GenericArray::from_slice(b"and secret nonce");
// create cipher instance
let mut cipher = Aes128Ctr::new(&key, &nonce);
// apply keystream (encrypt)
cipher.apply_keystream(&mut data);
assert_eq!(data, [6, 245, 126, 124, 180, 146, 37]);

// seek to the keystream beginning and apply it again to the `data` (decrypt)
cipher.seek(0);
cipher.apply_keystream(&mut data);
assert_eq!(data, [1, 2, 3, 4, 5, 6, 7]);

Re-exports

pub extern crate stream_cipher;

Structs

Ctr128

CTR mode of operation for 128-bit block ciphers