Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.crypto.examples; import java.io.IOException; import java.security.GeneralSecurityException; import java.util.Arrays; import java.util.Properties; import org.apache.commons.crypto.random.CryptoRandom; import org.apache.commons.crypto.random.CryptoRandomFactory; /** * Example showing use of the CryptoRandom API */ public class RandomExample { public static void main(String[] args) throws GeneralSecurityException, IOException { // Constructs a byte array to store random data. byte[] key = new byte[16]; byte[] iv = new byte[32]; Properties properties = new Properties(); properties.put(CryptoRandomFactory.CLASSES_KEY, CryptoRandomFactory.RandomProvider.OPENSSL.getClassName()); // Gets the 'CryptoRandom' instance. try (CryptoRandom random = CryptoRandomFactory.getCryptoRandom(properties)) { // Show the actual class (may be different from the one requested) System.out.println(random.getClass().getCanonicalName()); // Generate random bytes and places them into the byte arrays. random.nextBytes(key); random.nextBytes(iv); } // Show the generated output System.out.println(Arrays.toString(key)); System.out.println(Arrays.toString(iv)); } }