--
-- crypt() and gen_salt(): bcrypt
--
select crypt('', '$2a$06$RQiOJ.3ELirrXwxIZY8q0O');
                            crypt                             
--------------------------------------------------------------
 $2a$06$RQiOJ.3ELirrXwxIZY8q0OlGbBEpDmx7IRZlNYvGJ1SHXwNi2cEKK
(1 row)

select crypt('foox', '$2a$06$RQiOJ.3ELirrXwxIZY8q0O');
                            crypt                             
--------------------------------------------------------------
 $2a$06$RQiOJ.3ELirrXwxIZY8q0OR3CVJrAfda1z26CCHPnB6mmVZD8p0/C
(1 row)

create table ctest (data text, res text, salt text);
insert into ctest values ('password', '', '');
update ctest set salt = gen_salt('bf', 8);
update ctest set res = crypt(data, salt);
select res = crypt(data, res) as "worked" from ctest;
 worked 
--------
 t
(1 row)

drop table ctest;