PHP Manual: Compute a tag for the message

Description

string sodium_crypto_auth(string $message, #[\SensitiveParameter]string $key)

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.)

Parameters

message: The message you intend to authenticate
key: Authentication key

Return Values

Authentication tag