CREATE OR REPLACE FUNCTION MD5(passwd IN VARCHAR2)
RETURN VARCHAR2
IS
    retval varchar2(32);
BEGIN
	if passwd is null then 
		return null;
	end if;
    retval := (case when passwd is null then null else utl_raw.cast_to_raw(DBMS_OBFUSCATION_TOOLKIT.MD5(INPUT_STRING => passwd)) end);
RETURN retval;
END;
 

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