Implementations of the ChaCha20 + Poly1305 and XChaCha20 + Poly1305 AEAD constructions with a goal of simplicity and correctness rather than performance.
One construction is XChaCha20 + Poly1305 in a style similar to
but using XChaCha20 instead of XSalsa20.
The other construction is ChaCha20 + Poly1305 as specified in RFC 7539.
Copyright (C) 2016 Will Glozer.
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