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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.server.kerberos.shared.crypto.encryption;
21  
22  
23  import org.apache.directory.server.kerberos.shared.exceptions.KerberosException;
24  import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData;
25  import org.apache.directory.server.kerberos.shared.messages.value.EncryptionKey;
26  
27  
28  /**
29   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
30   * @version $Rev: 587682 $, $Date: 2007-10-24 00:47:43 +0200 (Mi, 24 Okt 2007) $
31   */
32  class NullEncryption extends EncryptionEngine
33  {
34      public EncryptionType getEncryptionType()
35      {
36          return EncryptionType.NULL;
37      }
38  
39  
40      public int getChecksumLength()
41      {
42          return 0;
43      }
44  
45  
46      public int getConfounderLength()
47      {
48          return 0;
49      }
50  
51  
52      public byte[] getDecryptedData( EncryptionKey key, EncryptedData data, KeyUsage usage ) throws KerberosException
53      {
54          return data.getCipher();
55      }
56  
57  
58      public EncryptedData getEncryptedData( EncryptionKey key, byte[] plainText, KeyUsage usage )
59      {
60          return new EncryptedData( getEncryptionType(), key.getKeyVersion(), plainText );
61      }
62  
63  
64      public byte[] encrypt( byte[] plainText, byte[] keyBytes )
65      {
66          return plainText;
67      }
68  
69  
70      public byte[] decrypt( byte[] cipherText, byte[] keyBytes )
71      {
72          return cipherText;
73      }
74  
75  
76      public byte[] calculateIntegrity( byte[] plainText, byte[] key, KeyUsage usage )
77      {
78          return null;
79      }
80  }