001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.core.random; 018 019import java.security.SecureRandom; 020import java.util.Base64; 021 022/** 023 * Supplies the Wicket application with random bytes. 024 * 025 * @author papegaaij 026 */ 027public interface ISecureRandomSupplier 028{ 029 /** 030 * Returns the actual {@code SecureRandom} being used as source. 031 * 032 * @return The {@code SecureRandom}. 033 */ 034 SecureRandom getRandom(); 035 036 /** 037 * Returns a byte array with random bytes of the given length. 038 * 039 * @param length 040 * The number of bytes to return. 041 * @return A byte array with random bytes of the given length. 042 */ 043 default byte[] getRandomBytes(int length) 044 { 045 byte[] ret = new byte[length]; 046 getRandom().nextBytes(ret); 047 return ret; 048 } 049 050 /** 051 * Returns a url-base64 encoded string with random content, base on {@code length} bytes. The 052 * length of the returned string will be {@code length/3*4}. 053 * 054 * @param length 055 * The number of random bytes to use as input. 056 * @return A string with random base64 data. 057 */ 058 default String getRandomBase64(int length) 059 { 060 return Base64.getUrlEncoder().encodeToString(getRandomBytes(length)); 061 } 062}