MariaDB [(none)]> show status like 'Ssl_cipher';

+---------------+---------------------------+

| Variable_name | Value                     |

+---------------+---------------------------+

| Ssl_cipher    | DHE-RSA-AES256-GCM-SHA384 |

+---------------+---------------------------+

1 row in set (0.01 sec)

MariaDB [(none)]> select aes_decrypt('MySQL','adf');

+----------------------------+

| aes_decrypt('MySQL','adf') |

+----------------------------+

| NULL                       |

+----------------------------+

1 row in set (0.00 sec)

MariaDB [(none)]> select aes_decrypt('MySQL','adf');

ERROR 2013 (HY000): Lost connection to MySQL server during query