(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_sign — Sign a message
$message, string $secret_key): stringSign a message with a secret key, that can be verified by the corresponding public key. This function attaches the signature to the message. See sodium_crypto_sign_detached() for detached signatures.
messageMessage to sign.
secret_keySecret key. See sodium_crypto_sign_secretkey()
Signed message (not encrypted).