Here you can find the source of reverse(byte[] data)
public static byte[] reverse(byte[] data)
//package com.java2s; /*/*from w w w . j a va 2 s. com*/ * Copyright 2013 bits of proof zrt. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static byte[] reverse(byte[] data) { for (int i = 0, j = data.length - 1; i < data.length / 2; i++, j--) { data[i] ^= data[j]; data[j] ^= data[i]; data[i] ^= data[j]; } return data; } }