User passwords in SQL are stored in MD5.

zabbix=> select * from users;

userid | alias | name | surname | passwd |
----------------------------------------------------------------+
1 | Admin | Zabbix | Administrator | 5fce1b3e34b520afeffb37ce08c7cd66 |
2 | guest | | | d41d8cd98f00b204e9800998ecf8427e |
(2 rows)