--
-- crypt() and gen_salt(): crypt-des
--
SELECT crypt('', 'NB');
     crypt     
---------------
 NBPx/38Y48kHg
(1 row)

SELECT crypt('foox', 'NB');
     crypt     
---------------
 NB53EGGqrrb5E
(1 row)

CREATE TABLE ctest (data text, res text, salt text);
INSERT INTO ctest VALUES ('password', '', '');
UPDATE ctest SET salt = gen_salt('des');
UPDATE ctest SET res = crypt(data, salt);
SELECT res = crypt(data, res) AS "worked"
FROM ctest;
 worked 
--------
 t
(1 row)

DROP TABLE ctest;