ChaCha20Poly1305 (RFC 8439) is an Authenticated Encryption with Associated Data (AEAD) cipher amenable to fast, constant-time implementations in software, based on the ChaCha20 stream cipher and Poly1305 universal hash function.
This crate also contains an implementation of XChaCha20Poly1305: a variant of ChaCha20Poly1305 with an extended 192-bit (24-byte) nonce.
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.
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