aes-ctr 0.5.0

AES-CTR stream ciphers

RustCrypto: AES-CTR

Crate Docs Apache2/MIT licensed Rust Version Build Status HAZMAT

Pure Rust implementation of the Advanced Encryption Standard (AES) in Counter Mode.

Provides a high-performance implementation based on AES-NI and other x86(-64) CPU intrinsics when available, or otherwise falls back on a bitsliced software implementation and the ctr crate.


⚠️ Security Warning: Hazmat!

This crate does not ensure ciphertexts are authentic (i.e. by using a MAC to verify ciphertext integrity), which can lead to serious vulnerabilities if used incorrectly!

To avoid this, use an AEAD mode based on AES, such as AES-GCM or AES-GCM-SIV.

See the RustCrypto/AEADs repository for more information.


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.

SemVer Policy

  • All on-by-default features of this library are covered by SemVer
  • MSRV is considered exempt from SemVer as noted above


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.