AES block cipher implementation using AES-NI instruction set.

This crate does not implement any software fallback and does not automatically check CPUID, so if you are using this crate make sure to run software on an appropriate hardware or to use software fallback (e.g. from aes-soft crate) with runtime detection of AES-NI availability (e.g. by using cupid crate).

When using this crate do not forget to enable aes target feature, otherwise you will get an empty crate. You can do it either by using RUSTFLAGS="-C target-feature=+aes" or by editing your .cargo/config. Alternatively you can enable ignore_target_feature_check crate feature which will bypass target feature check, but it will have a negative implact on performance.

This crate currently requires nigthly Rust compiler due to the usage of unstable cfg_target_feature and stdsimd features.

Ciphers functionality is accessed using BlockCipher trait from block-cipher-trait crate.

Usage example

# use aesni::block_cipher_trait::generic_array::GenericArray;
use aesni::{Aes128, BlockCipher};

let key = GenericArray::from_slice(&[0u8; 16]);
let mut block = GenericArray::clone_from_slice(&[0u8; 16]);
let mut block8 = GenericArray::clone_from_slice(&[block; 8]);
// Initialize cipher
let cipher = aesni::Aes128::new(&key);

let block_copy = block.clone();
// Encrypt block in-place
cipher.encrypt_block(&mut block);
// And decrypt it back
cipher.decrypt_block(&mut block);
assert_eq!(block, block_copy);

// We can encrypt 8 blocks simultaneously using
// instruction-level parallelism
let block8_copy = block8.clone();
cipher.encrypt_blocks(&mut block8);
cipher.decrypt_blocks(&mut block8);
assert_eq!(block8, block8_copy);

Related documents

• Intel AES-NI whitepaper
• Use of the AES Instruction Set