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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.cassandra.security;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import java.util.HashMap;
  import java.util.Random;
  import javax.crypto.BadPaddingException;
  import javax.crypto.Cipher;
  import javax.crypto.IllegalBlockSizeException;
  import javax.crypto.ShortBufferException;
  
  import org.apache.cassandra.io.util.File;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.config.TransparentDataEncryptionOptions;
  import org.apache.cassandra.io.compress.ICompressor;
  import org.apache.cassandra.io.compress.LZ4Compressor;
  import org.apache.cassandra.io.util.FileUtils;
  import org.apache.cassandra.io.util.RandomAccessReader;
  
  public class EncryptionUtilsTest
  {
      @BeforeClass
      public static void initDD()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      final Random random = new Random();
      ICompressor compressor;
      TransparentDataEncryptionOptions tdeOptions;
  
      @Before
      public void setup()
      {
          compressor = LZ4Compressor.create(new HashMap<>());
          tdeOptions = EncryptionContextGenerator.createEncryptionOptions();
      }
  
      @Test
      public void compress() throws IOException
      {
          byte[] buf = new byte[(1 << 13) - 13];
          random.nextBytes(buf);
          ByteBuffer compressedBuffer = EncryptionUtils.compress(ByteBuffer.wrap(buf), ByteBuffer.allocate(0), true, compressor);
          ByteBuffer uncompressedBuffer = EncryptionUtils.uncompress(compressedBuffer, ByteBuffer.allocate(0), true, compressor);
          Assert.assertArrayEquals(buf, uncompressedBuffer.array());
      }
  
      @Test
      public void encrypt() throws BadPaddingException, ShortBufferException, IllegalBlockSizeException, IOException
      {
          byte[] buf = new byte[(1 << 12) - 7];
          random.nextBytes(buf);
  
          // encrypt
          CipherFactory cipherFactory = new CipherFactory(tdeOptions);
          Cipher encryptor = cipherFactory.getEncryptor(tdeOptions.cipher, tdeOptions.key_alias);
  
          File f = FileUtils.createTempFile("commitlog-enc-utils-", ".tmp");
          f.deleteOnExit();
          FileChannel channel = f.newReadWriteChannel();
          EncryptionUtils.encryptAndWrite(ByteBuffer.wrap(buf), channel, true, encryptor);
          channel.close();
  
          // decrypt
          Cipher decryptor = cipherFactory.getDecryptor(tdeOptions.cipher, tdeOptions.key_alias, encryptor.getIV());
          ByteBuffer decryptedBuffer = EncryptionUtils.decrypt(RandomAccessReader.open(f), ByteBuffer.allocate(0), true, decryptor);
  
          // normally, we'd just call BB.array(), but that gives you the *entire* backing array, not with any of the offsets (position,limit) applied.
          // thus, just for this test, we copy the array and perform an array-level comparison with those offsets
          decryptedBuffer.limit(buf.length);
          byte[] b = new byte[buf.length];
          System.arraycopy(decryptedBuffer.array(), 0, b, 0, buf.length);
          Assert.assertArrayEquals(buf, b);
      }
  
      @Test
      public void fullRoundTrip() throws IOException, BadPaddingException, ShortBufferException, IllegalBlockSizeException
      {
          // compress
          byte[] buf = new byte[(1 << 12) - 7];
          random.nextBytes(buf);
          ByteBuffer compressedBuffer = EncryptionUtils.compress(ByteBuffer.wrap(buf), ByteBuffer.allocate(0), true, compressor);
  
          // encrypt
          CipherFactory cipherFactory = new CipherFactory(tdeOptions);
          Cipher encryptor = cipherFactory.getEncryptor(tdeOptions.cipher, tdeOptions.key_alias);
          File f = FileUtils.createTempFile("commitlog-enc-utils-", ".tmp");
          f.deleteOnExit();
          FileChannel channel = f.newReadWriteChannel();
          EncryptionUtils.encryptAndWrite(compressedBuffer, channel, true, encryptor);
  
          // decrypt
          Cipher decryptor = cipherFactory.getDecryptor(tdeOptions.cipher, tdeOptions.key_alias, encryptor.getIV());
          ByteBuffer decryptedBuffer = EncryptionUtils.decrypt(RandomAccessReader.open(f), ByteBuffer.allocate(0), true, decryptor);
  
          // uncompress
          ByteBuffer uncompressedBuffer = EncryptionUtils.uncompress(decryptedBuffer, ByteBuffer.allocate(0), true, compressor);
          Assert.assertArrayEquals(buf, uncompressedBuffer.array());
      }
  }
  