ChaCha20
ChaCha20 is a stream cipher which is designed to support high-performance software implementations.
It improves upon the previous Salsa20 stream cipher with increased per-round diffusion at no cost to performance.
This crate also contains an implementation of XChaCha20: a variant
of ChaCha20 with an extended 192-bit (24-byte) nonce, gated under the
xchacha20 Cargo feature (on-by-default).
Security Warning
This crate does not ensure ciphertexts are authentic! Thus ciphertext integrity is not verified, which can lead to serious vulnerabilities! To avoid this, use the ChaCha20Poly1305 Authenticated Encryption with Associated Data (AEAD) algorithm instead.
No security audits of this crate have ever been performed, and it has not been thoroughly assessed to ensure its operation is constant-time on common CPU architectures.
USE AT YOUR OWN RISK!
License
Licensed under either of:
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.