http://commons.apache.org/proper/commons-crypto/: Apache Commons Crypto is a cryptographic library optimized with AES-NI (Advanced Encryption Standard New Instructions). It provides Java API for both cipher level and Java stream level. Developers can use it to implement high performance AES encryption/decryption with the minimum code and effort. Please note that Crypto doesn't implement the cryptographic algorithm such as AES directly. It wraps to Openssl or JCE which implement the algorithms. Features -------- 1. Cipher API for low level cryptographic operations. 2. Java stream API (CryptoInputStream/CryptoOutputStream) for high level stream encyrption/decryption. 3. Both optimized with high performance AES encryption/decryption. (1400 MB/s - 1700 MB/s throughput in modern Xeon processors). 4. JNI-based implementation to achieve comparable performance to the native C++ version based on OpenSsl. 5. Portable across various operating systems (currently only Linux/MacOSX/Windows); Apache Commons Crypto loads the library according to your machine environment (it checks system properties, `os.name` and `os.arch`). 6. Simple usage. Add the commons-crypto-(version).jar file to your classpath. Export restrictions ------------------- This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See <http://www.wassenaar.org/> for more information. The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache Software Foundation distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code. The following provides more details on the included cryptographic software: * Commons Crypto use [Java Cryptography Extension](http://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html) provided by Java * Commons Crypto link to and use [OpenSSL](https://www.openssl.org/) ciphers (The Apache Software Foundation)
  • Colin Ma
  • Xianda Ke
  • Ke Jia
  • George Kankava
  • Aaron T Myers
  • Andrew Wang
  • Chris Nauroth
  • Colin P. McCabe
  • Dapeng Sun
  • Dian Fu
  • Dong Chen
  • Ferdinand Xu
  • Haifeng Chen
  • Marcelo Vanzin
  • Uma Maheswara Rao G
  • Yi Liu 
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
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    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
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/**
 * 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.random;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Properties;


A CryptoRandom of Java implementation.

/**
 * A CryptoRandom of Java implementation.
 */
class JavaCryptoRandom implements CryptoRandom {

    private final SecureRandom instance;

    
Constructs a JavaCryptoRandom. 
Params:
Throws:
/**
     * Constructs a {@link JavaCryptoRandom}.
     *
     * @param properties the configuration properties.
     * Uses the key {@link CryptoRandomFactory#SECURE_RANDOM_JAVA_ALGORITHM_KEY}
     * to get the name of the algorithm, with a default of
     * {@link CryptoRandomFactory#JAVA_ALGORITHM_DEFAULT}
     * @throws NoSuchAlgorithmException if no Provider supports a
     *         SecureRandomSpi implementation for the specified algorithm.
     */
    // N.B. this class is not public/protected so does not appear in the main Javadoc
    // Please ensure that property use is documented in the enum CryptoRandomFactory.RandomProvider
    public JavaCryptoRandom(Properties properties)
            throws NoSuchAlgorithmException {
        instance = SecureRandom
                .getInstance(properties
                        .getProperty(
                                CryptoRandomFactory.JAVA_ALGORITHM_KEY,
                                CryptoRandomFactory.JAVA_ALGORITHM_DEFAULT));
    }

    
Overrides AutoCloseable.close(). For JavaCryptoRandom, we don't need to recycle resource. 
/**
     * Overrides {@link java.lang.AutoCloseable#close()}. For
     * {@link JavaCryptoRandom}, we don't need to recycle resource.
     */
    @Override
    public void close() {
        // do nothing
    }

    
Overrides CryptoRandom.nextBytes(byte[]). Generates random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array. 
Params:
  • bytes – the array to be filled in with random bytes.
/**
     * Overrides {@link CryptoRandom#nextBytes(byte[])}. Generates random bytes
     * and places them into a user-supplied byte array. The number of random
     * bytes produced is equal to the length of the byte array.
     *
     * @param bytes the array to be filled in with random bytes.
     */
    @Override
    public void nextBytes(byte[] bytes) {
        instance.nextBytes(bytes);
    }
}