Oracle MD5 函数

CREATE OR REPLACE FUNCTION md5hash (str IN VARCHAR2)
	RETURN VARCHAR2
	IS v_checksum VARCHAR2(32);
 
	BEGIN
		v_checksum := LOWER( RAWTOHEX( UTL_RAW.CAST_TO_RAW( sys.dbms_obfuscation_toolkit.md5(input_string => str) ) ) );
		RETURN v_checksum;
		EXCEPTION
			WHEN NO_DATA_FOUND THEN
			NULL;
		WHEN OTHERS THEN
			-- Consider logging the error and then re-raise
			RAISE;
	END md5hash;
/

 from: http://www.pilcrow.nl/2010/12/md5-function-in-oracle