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I've unfortunately seen many situations where only NIST approved constructions are allowed. ChaCha is not an approved NIST algorithm but AES-256-GCM is


I totally get that, but XAES-256-GCM/11 is in an even worse situation than XChachaPoly since none are NIST but XChachaPoly has at least a RFC ^^

EDIT: I'm wrong, ChachaPoly has an rfc, but not the X variant


XChaCha20Poly1305 does have an RFC authored by Scott Arciszewski: https://datatracker.ietf.org/doc/html/draft-arciszewski-xcha...


Yes but it has been expired for a while




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