001 /** 002 * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved. 003 * 004 * The contents of this file are subject to the terms of the Liferay Enterprise 005 * Subscription License ("License"). You may not use this file except in 006 * compliance with the License. You can obtain a copy of the License by 007 * contacting Liferay, Inc. See the License for the specific language governing 008 * permissions and limitations under the License, including but not limited to 009 * distribution rights of the Software. 010 * 011 * 012 * 013 */ 014 015 package com.liferay.portal.kernel.security; 016 017 import java.util.Random; 018 019 /** 020 * @author Shuyang Zhou 021 */ 022 public class SecureRandom extends Random { 023 024 @Override 025 protected int next(int bits) { 026 int bytes = (bits + 7) / 8; 027 028 int result = SecureRandomUtil.nextByte(); 029 030 for (int i = 1; i < bytes; i++) { 031 result = (result << 8) + (SecureRandomUtil.nextByte() & 0xFF); 032 } 033 034 return result >>> (bytes * 8 - bits); 035 } 036 037 }