Cómo calcular correctamente la suma de comprobación en Java

¿público?clase?MD5HashingExample?

{

público?static?void?main(String[]? args) throws?Exception

{

String?123456";

MessageDigest?md?=?MessageDigest.getInstance("MD5");

md.update(password.getBytes("UTF-8"));?

byte byteData[] = md.digest()

//convertir byte a hexadecimal; método de formato 1

StringBuffer sb = new StringBuffer();

for(int i = 0; i lt; byteData.length; i )?{ sb.append(Integer.toString ((byteData[i]?amp;?0xff)??0x100,?16).substring(1));

}

System.out.println("Digest( en?formato hexadecimal)::?") ? ?sb.toString());

//convertir?el?byte?a?formato?hexadecimal?2

StringBuffer?hexString?=?new?StringBuffer();

para ?(int?i=0;ilt;byteData.length;i )?{

String?hex= Integer.toHexString(0xff?amp;?byteData[i]);

? if(hex.length()==1)?hexString.append('0');

? hexString.append(hex);

}

System.out.println("Digest(en? formato hexadecimal)::?") ?hexString.toString( ));

}

}

}

}