oracle password

create or replace function open_password(passwordStr in varchar2) return varchar2 is
begin
declare v_password varchar2(100);
     begin
      select translate(passwordStr,'M!qNw@eBr#tVy$uCi%oXp^aZs&dLf*mWn1Qb2AvE3ScRxD4FzTlG5YkH6jUhJ7gI8KOP90'
             ,'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890!@#$%^&*') into v_password from dual;
       return v_password;
       end;
end open_password;

create or replace function close_password(passwordStr in varchar2) return varchar2 is
begin
declare v_password varchar2(100);
     begin
       select translate(passwordStr,'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890!@#$%^&*'
       ,'M!qNw@eBr#tVy$uCi%oXp^aZs&dLf*mWn1Qb2AvE3ScRxD4FzTlG5YkH6jUhJ7gI8KOP90') into v_password from dual;
       return v_password;
       end;
end close_password;