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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.
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   */
  package org.apache.cassandra.security;
  
  import java.io.IOException;
  import java.security.NoSuchAlgorithmException;
  import java.security.SecureRandom;
  
  import javax.crypto.BadPaddingException;
  import javax.crypto.Cipher;
  import javax.crypto.IllegalBlockSizeException;
  
  import com.google.common.base.Charsets;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  import org.apache.cassandra.config.TransparentDataEncryptionOptions;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.fail;
  
  public class CipherFactoryTest
  {
      // http://www.gutenberg.org/files/4300/4300-h/4300-h.htm
      static final String ULYSSEUS = "Stately, plump Buck Mulligan came from the stairhead, bearing a bowl of lather on which a mirror and a razor lay crossed. " +
                                     "A yellow dressinggown, ungirdled, was sustained gently behind him on the mild morning air. He held the bowl aloft and intoned: " +
                                     "-Introibo ad altare Dei.";
      TransparentDataEncryptionOptions encryptionOptions;
      CipherFactory cipherFactory;
      SecureRandom secureRandom;
  
      @Before
      public void setup()
      {
          try
          {
              secureRandom = SecureRandom.getInstance("SHA1PRNG");
              assertNotNull(secureRandom.getProvider());
          }
          catch (NoSuchAlgorithmException e)
          {
              fail("NoSuchAlgorithmException: SHA1PRNG not found.");
          }
          long seed = new java.util.Random().nextLong();
          System.out.println("Seed: " + seed);
          secureRandom.setSeed(seed);
          encryptionOptions = EncryptionContextGenerator.createEncryptionOptions();
          cipherFactory = new CipherFactory(encryptionOptions);
      }
  
      @Test
      public void roundTrip() throws IOException, BadPaddingException, IllegalBlockSizeException
      {
          Cipher encryptor = cipherFactory.getEncryptor(encryptionOptions.cipher, encryptionOptions.key_alias);
          byte[] original = ULYSSEUS.getBytes(Charsets.UTF_8);
          byte[] encrypted = encryptor.doFinal(original);
  
          Cipher decryptor = cipherFactory.getDecryptor(encryptionOptions.cipher, encryptionOptions.key_alias, encryptor.getIV());
          byte[] decrypted = decryptor.doFinal(encrypted);
          Assert.assertEquals(ULYSSEUS, new String(decrypted, Charsets.UTF_8));
      }
  
      private byte[] nextIV()
      {
          byte[] b = new byte[16];
          secureRandom.nextBytes(b);
          return b;
      }
  
      @Test
      public void buildCipher_SameParams() throws Exception
      {
          byte[] iv = nextIV();
          Cipher c1 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, iv, Cipher.ENCRYPT_MODE);
          Cipher c2 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, iv, Cipher.ENCRYPT_MODE);
          Assert.assertTrue(c1 == c2);
      }
  
      @Test
      public void buildCipher_DifferentModes() throws Exception
      {
          byte[] iv = nextIV();
          Cipher c1 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, iv, Cipher.ENCRYPT_MODE);
          Cipher c2 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, iv, Cipher.DECRYPT_MODE);
          Assert.assertFalse(c1 == c2);
      }
  
      @Test
      public void buildCipher_DifferentIVs() throws Exception
      {
          Cipher c1 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, nextIV(), Cipher.ENCRYPT_MODE);
          Cipher c2 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, nextIV(), Cipher.DECRYPT_MODE);
          Assert.assertFalse(c1 == c2);
      }
  
      @Test
      public void buildCipher_DifferentAliases() throws Exception
      {
          Cipher c1 = cipherFactory.buildCipher(encryptionOptions.cipher, encryptionOptions.key_alias, nextIV(), Cipher.ENCRYPT_MODE);
          Cipher c2 = cipherFactory.buildCipher(encryptionOptions.cipher, EncryptionContextGenerator.KEY_ALIAS_2, nextIV(), Cipher.DECRYPT_MODE);
          Assert.assertFalse(c1 == c2);
      }
  
      @Test(expected = AssertionError.class)
      public void getDecryptor_NullIv() throws IOException
      {
          cipherFactory.getDecryptor(encryptionOptions.cipher, encryptionOptions.key_alias, null);
      }
  
      @Test(expected = AssertionError.class)
      public void getDecryptor_EmptyIv() throws IOException
      {
          cipherFactory.getDecryptor(encryptionOptions.cipher, encryptionOptions.key_alias, new byte[0]);
      }
  }
  