Poly1305
Poly1305 is a universal hash function which, when combined with a cipher, can be used as a Message Authentication Code (MAC).
In practice, Poly1305 is primarily combined with ciphers from the Salsa20 Family such as ChaCha20.
License
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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.