!!! Overview
[{$pagename}] is decribed in [RFC 7539]

[AEAD_CHACHA20_POLY1305] is an [Authenticated Encryption with Associated Data] [algorithm]. The inputs to [AEAD_CHACHA20_POLY1305] are:
* A 256-bit key
* A 96-bit [nonce] -- different for each invocation with the same key
* An arbitrary length plaintext
* Arbitrary length additional authenticated data ([AAD])

   Some protocols may have unique per-invocation inputs that are not 96
   bits in length.  For example, IPsec may specify a 64-bit nonce.  In
   such a case, it is up to the protocol document to define how to
   transform the protocol nonce into a 96-bit nonce, for example, by
   concatenating a constant value.

   The [ChaCha20] and [Poly1305] [Cryptographic Primitives] are combined into an [Authenticated Encryption with Associated Data]

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