SQL

CREATE OR REPLACE FUNCTION MD5(passwd IN VARCHAR2) RETURN VARCHAR2 IS
  retval varchar2(32);
BEGIN
  retval := utl_raw.cast_to_raw(DBMS_OBFUSCATION_TOOLKIT.MD5(INPUT_STRING => passwd));
  RETURN retval;
END;

测试

select md5('lw112190') from dual

效果