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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.commons.crypto.examples;
19  
20  import java.io.IOException;
21  import java.security.GeneralSecurityException;
22  import java.util.Arrays;
23  import java.util.Properties;
24  
25  import org.apache.commons.crypto.random.CryptoRandom;
26  import org.apache.commons.crypto.random.CryptoRandomFactory;
27  
28  /**
29   * Example showing use of the CryptoRandom API
30   */
31  public class RandomExample {
32  
33      public static void main(String []args) throws GeneralSecurityException, IOException {
34          // Constructs a byte array to store random data.
35          byte[] key = new byte[16];
36          byte[] iv = new byte[32];
37  
38          Properties properties = new Properties();
39          properties.put(CryptoRandomFactory.CLASSES_KEY,
40              CryptoRandomFactory.RandomProvider.OPENSSL.getClassName());
41  
42          // Gets the 'CryptoRandom' instance.
43          try (CryptoRandom random = CryptoRandomFactory.getCryptoRandom(properties)) {
44  
45              // Show the actual class (may be different from the one requested)
46              System.out.println(random.getClass().getCanonicalName());
47  
48              // Generate random bytes and places them into the byte arrays.
49              random.nextBytes(key);
50              random.nextBytes(iv);
51  
52          }
53  
54          // Show the generated output
55          System.out.println(Arrays.toString(key));
56          System.out.println(Arrays.toString(iv));
57      }
58  }