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Description
https://tools.ietf.org/html/draft-irtf-cfrg-xchacha-01#section-2
AEAD_XChaCha20_Poly1305
XChaCha20-Poly1305 is a variant of the ChaCha20-Poly1305 AEAD
construction as defined in [RFC7539] that uses a 192-bit nonce
instead of a 96-bit nonce.