Java MD5 Hash Generator which is equivalent to PHP MD5()

Java MD5 Hash Generator

 public static String md5Hash (String input) throws NoSuchAlgorithmException {
        String result = input;
        if(input != null) {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.update(input.getBytes());
            BigInteger hash = new BigInteger(1, messageDigest.digest());
            result = hash.toString(16);
            while (result.length() < 32) {
                result = "0"+result;
            }
        }
        return result;
    }