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(final String []args) throws GeneralSecurityException, IOException {
34 // Constructs a byte array to store random data.
35 final byte[] key = new byte[16];
36 final byte[] iv = new byte[32];
37
38 final 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 }