Função para criptografar com MD5 (Java)

    /**
* criptografa usando MD5
*
* @param valor
* @return
* @throws NoSuchAlgorithmException
*/
    public static String md5 (String valor) throws Exception {
MessageDigest md = MessageDigest.getInstance(”MD5″);
BigInteger hash = new BigInteger(1, md.digest(valor.getBytes()));
String s = hash.toString(16);
if (s.length() %2 != 0)
s = “0″ + s;
return s;
}