Here you can find the source of generateRandomBytes()
public static byte[] generateRandomBytes()
//package com.java2s; /*// www . j ava 2 s . c o m * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved. * * 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. */ import java.util.Random; public class Main { private static final Random rng = new Random(); public static byte[] generateRandomBytes() { int length = rng.nextInt(200); return generateRandomBytes(length); } public static byte[] generateRandomBytes(int numBytes) { byte[] messageBytes = new byte[numBytes]; rng.nextBytes(messageBytes); return messageBytes; } }