DECLARE
 rawval RAW(32767);
BEGIN
  //Varchar2bol csinalj RAW-ot
  rawval := UTL_RAW.cast_to_raw('You random Varchar2 value goes here');
  DBMS_OUTPUT.put_line(rawval);
  //Itt encode
  rawval := UTL_ENCODE.base64_encode(rawval);
  DBMS_OUTPUT.put_line(rawval);

  //Igen van DECODE IS
  rawval:= UTL_ENCODE.base64_decode(r);
  DBMS_OUTPUT.put_line(r);
END;
/