Calculated passwords ?

Hi,

is it possible (using 8i+) to use calculated passwords?

something like

create user foo identified by checkpass();

E.g. user attempts to log into oracle, using SQL*Plus or whatever other application, and instead for checking for a fixed password, a PL/SQL-function is called that checks the password and allows/denies login.

-- 
                                                   Andreas
To boldly go where no sane person has gone before