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.NoSuchAlgorithmException;
020import java.security.SecureRandom;
021
022import org.apache.wicket.WicketRuntimeException;
023
024/**
025 * A very simple {@link ISecureRandomSupplier} that holds a {@code SecureRandom} using
026 * {@code SHA1PRNG}. This {@code SecureRandom} is strong enough for generation of nonces with a
027 * short lifespan, but might not be strong enough for generating long-lived keys. When your
028 * application has stronger requirements on the random implementation, you should replace this class
029 * by your own implementation.
030 * 
031 * @author papegaaij
032 */
033public class DefaultSecureRandomSupplier implements ISecureRandomSupplier
034{
035        private SecureRandom random;
036
037        public DefaultSecureRandomSupplier()
038        {
039                try
040                {
041                        random = SecureRandom.getInstance("SHA1PRNG");
042                }
043                catch (NoSuchAlgorithmException e)
044                {
045                        throw new WicketRuntimeException(e);
046                }
047        }
048
049        @Override
050        public SecureRandom getRandom()
051        {
052                return random;
053        }
054}