/*
    * 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;
  
  import java.nio.ByteBuffer;
  import java.util.Properties;
  
  import javax.crypto.Cipher;
  import javax.crypto.spec.IvParameterSpec;
  import javax.crypto.spec.SecretKeySpec;
  
  import org.apache.commons.crypto.cipher.CryptoCipher;
  import org.apache.commons.crypto.cipher.CryptoCipherFactory;
  import org.apache.commons.crypto.random.CryptoRandom;
  import org.apache.commons.crypto.random.CryptoRandomFactory;
  import org.apache.commons.crypto.utils.AES;
  import org.apache.commons.crypto.utils.Utils;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public abstract class AbstractBenchmark {
  
      private static final byte[] KEY = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                  0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16 };
      private static final byte[] IV = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                  0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
      private static final SecretKeySpec keySpec = Utils.newSecretKeySpec(KEY);
      private static final IvParameterSpec ivSpec = new IvParameterSpec(IV);
      private static final byte[] BUFFER = new byte[1000];
  
      public AbstractBenchmark() {
          super();
      }
  
      protected void random(final String cipherClass) throws Exception {
          final CryptoRandom random = getRandom(cipherClass);
          random.nextBytes(new byte[1000]);
          random.nextBytes(new byte[1000]);
          random.close();
      }
  
      protected void encipher(final String cipherClass) throws Exception {
          final CryptoCipher enCipher = getCipher(cipherClass);
          enCipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
          final int bufferSize = 1024;
          final ByteBuffer inBuffer = ByteBuffer.allocateDirect(bufferSize);
          final ByteBuffer outBuffer = ByteBuffer.allocateDirect(bufferSize);
          inBuffer.put(BUFFER);
          inBuffer.flip();
          enCipher.doFinal(inBuffer, outBuffer);
          enCipher.close();
      }
  
      protected CryptoRandom getRandom(final String className) throws Exception {
          final Properties props = new Properties();
          props.setProperty(CryptoRandomFactory.CLASSES_KEY, className);
          final CryptoRandom cryptoRandom = CryptoRandomFactory.getCryptoRandom(props);
          assertEquals(className, cryptoRandom.getClass().getCanonicalName());
          return cryptoRandom;
      }
  
      protected CryptoCipher getCipher(final String className) throws Exception {
          final Properties properties = new Properties();
          properties.setProperty(CryptoCipherFactory.CLASSES_KEY, className);
          final CryptoCipher cipher = CryptoCipherFactory.getCryptoCipher(AES.CTR_NO_PADDING, properties);
          assertEquals(className, cipher.getClass().getCanonicalName());
          return cipher;
      }
  
  }