HDB_KU_MKEY
ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
(*mkey)->key_usage = HDB_KU_MKEY;
db->hdb_master_key->key_usage = HDB_KU_MKEY;