koivunej / stream-ciphers

Collection of stream cipher algorithms

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RustCrypto: stream ciphers Rust Version Project Chat HAZMAT

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.



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

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.


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) {


All crates licensed under either of

at your option.


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.

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Collection of stream cipher algorithms


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