XSalsa20Poly1305 (a.k.a. NaCl crypto_secretbox) is an
authenticated encryption cipher amenable to fast, constant-time
implementations in software, based on the Salsa20 stream cipher
(with XSalsa20 192-bit nonce extension) and the Poly1305 universal
hash function, which acts as a message authentication code.
This algorithm has largely been replaced by the newer ChaCha20Poly1305 (and the associated XChaCha20Poly1305) AEAD ciphers (RFC 8439), but is useful for interoperability with legacy NaCl-based protocols.
This crate has received one security audit by Cure53 (version 0.8.0), with no significant findings. We would like to thank Threema for funding the audit.
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