ChaCha20 and Poly1305 for IETF Protocols, May 2015
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This document defines the ChaCha20 stream cipher as well as the use of the Poly1305 authenticator, both as stand-alone algorithms and as a "combined mode", or Authenticated Encryption with Associated Data (AEAD) algorithm.
This document does not introduce any new crypto, but is meant to serve as a stable reference and an implementation guide. It is a product of the Crypto Forum Research Group (CFRG).
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.