RustCrypto: stream ciphers

Collection of stream cipher algorithms written in pure Rust.

⚠️ Security Warning: Hazmat!

Crates in this repository do not ensure ciphertexts are authentic (i.e. by using a MAC to verify ciphertext integrity), which can lead to serious vulnerabilities if used incorrectly!

Aside from the chacha20 crate, no crates in this repository have yet received any formal cryptographic and security reviews/audits.

USE AT YOUR OWN RISK!

Crates

Name	Crates.io	Documentation	Build Status
cfb-mode
cfb8
chacha20
ctr
hc-256
ofb
rabbit
salsa20

Minimum Supported Rust Version

Rust 1.41 or higher.

Minimum supported Rust version can be changed in the future, but it will be done with a minor version bump.

Usage

Crates functionality is expressed in terms of traits defined in the cipher crate.

Let's use AES-128-OFB to demonstrate usage of synchronous stream cipher:

use aes::Aes128;
use ofb::Ofb;

// import relevant traits
use ofb::cipher::{NewStreamCipher, SyncStreamCipher};

// OFB mode implementation is generic over block ciphers
// we will create a type alias for convenience
type AesOfb = Ofb<Aes128>;

let key = b"very secret key.";
let iv = b"unique init vect";
let plaintext = b"The quick brown fox jumps over the lazy dog.";

let mut buffer = plaintext.to_vec();

// create cipher instance
let mut cipher = AesOfb::new_var(key, iv)?;

// apply keystream (encrypt)
cipher.apply_keystream(&mut buffer);

// and decrypt it back
AesOfb::new_var(key, iv)?.apply_keystream(&mut buffer);

// stream ciphers can be used with streaming messages
let mut cipher = AesOfb::new_var(key, iv).unwrap();
for chunk in buffer.chunks_mut(3) {
    cipher.apply_keystream(chunk);
}

License

All crates licensed under either of

• Apache License, Version 2.0
• MIT license

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.