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RustCrypto: block ciphers Project Chat dependency status

Collection of block ciphers and block modes written in pure Rust.


Currently only the aes crate provides constant-time implementation and has received a third-party security audit.

Other crates in this repository are not implemented in a constant-time manner and have not yet received any formal cryptographic and security reviews.

It's generally recommended not to use other cipher implementations in this repository besides the aes crate.


Supported algorithms

Name Crate name Docs Build Status
AES (Rijndael) aes Documentation aes build
Blowfish blowfish Documentation build
CAST5 (CAST-128) cast5 Documentation build
DES + 3DES (DEA, 3DEA) des Documentation build
IDEA idea Documentation build
Kuznyechik (GOST R 34.12-2015) kuznyechik Documentation build
Magma (GOST 28147-89 and GOST R 34.12-2015) magma Documentation build
RC2 (ARC2) rc2 Documentation build
Serpent serpent Documentation build
SM4 sm4 Documentation build
Twofish twofish Documentation build
Threefish threefish Documentation build

Additional crates

Crate name Docs Build Status
block-modes Documentation build
gost-modes Documentation build

Minimum Supported Rust Version

All crates in this repository support Rust 1.22 or higher. (except aesni and aes crates, which require Rust 1.27) In future minimum supported Rust version can be changed, but it will be done with the minor version bump.


Block cipher crates provide only bare block cipher implementations. For most applications you will need to use some block cipher mode of operation which are generically implemented in the block-modes crate.

Some block modes (CTR, CFB, OFV) transform block ciphers into stream ciphers.Such modes are published under separate crates in the RustCrypto/stream-ciphers repository.

Lets use AES128-CBC with PKCS7 padding to show an example:

use aes::Aes128;
use block_modes::{BlockMode, Cbc};
use block_modes::block_padding::Pkcs7;
use hex_literal::hex;

// create an alias for convenience
type Aes128Cbc = Cbc<Aes128, Pkcs7>;

let key = hex!("000102030405060708090a0b0c0d0e0f");
let iv = hex!("f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff");
let plaintext = b"Hello world!";
let cipher = Aes128Cbc::new_from_slices(&key, &iv).unwrap();

// buffer must have enough space for message+padding
let mut buffer = [0u8; 32];
// copy message to the buffer
let pos = plaintext.len();
let ciphertext = cipher.encrypt(&mut buffer, pos).unwrap();

assert_eq!(ciphertext, hex!("1b7a4c403124ae2fb52bedc534d82fa8"));

// re-create cipher mode instance and decrypt the message
let cipher = Aes128Cbc::new_from_slices(&key, &iv).unwrap();
let mut buf = ciphertext.to_vec();
let decrypted_ciphertext = cipher.decrypt(&mut buf).unwrap();

assert_eq!(decrypted_ciphertext, plaintext);

With an enabled std feature (which is enabled by default) you can use encrypt_vec and decrypt_vec methods:

let cipher = Aes128Cbc::new_from_slices(&key, &iv).unwrap();
let ciphertext = cipher.encrypt_vec(plaintext);

assert_eq!(ciphertext, hex!("1b7a4c403124ae2fb52bedc534d82fa8"));

let cipher = Aes128Cbc::new_from_slices(&key, &iv).unwrap();
let decrypted_ciphertext = cipher.decrypt_vec(&ciphertext).unwrap();

assert_eq!(decrypted_ciphertext, plaintext);

Note that this example does not use any authentification which can lead to serious vulnarabilities! For Message Authentication Code implementations take a look at RustCrypto/MACs repository.


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.


Collection of block cipher algorithms written in pure Rust