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    }