Oracle Function for Password encryption

This code shows the password enryption logic in oracle database

CREATE OR REPLACE FUNCTION pass_encrypt( p_usernam IN VARCHAR2, p_password IN VARCHAR2 ) RETURN VARCHAR2
IS
BEGIN
RETURN LTRIM( TO_CHAR( dbms_utility.get_hash_value( UPPER(p_usernam)||'/'||UPPER(p_password),
         10000, POWER(2,30) ),
         RPAD( 'X',29,'X')||'X' ) );
END pass_encrypt;
/