To get the actual public and secret keys, use `sodium_crypto_box_publickey()` and `sodium_crypto_box_secretkey()`.
(PHP 7 >= 7.2.0)
sodium_crypto_box_keypair — Randomly generate a secret key and a corresponding public key
This function is currently not documented; only its argument list is available.
This function has no parameters.
To get the actual public and secret keys, use `sodium_crypto_box_publickey()` and `sodium_crypto_box_secretkey()`.