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(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_auth — Compute a tag for the message
Symmetric message authentication via sodium_crypto_auth() provides integrity, but not confidentiality.
Unlike with digital signatures (e.g. sodium_crypto_sign_detached()), any party capable of verifying a message is also capable of authenticating their own messages. (Hence, symmetric authentication.)
messagekeyAuthentication tag
