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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.io.decoder;
21  
22  
23  import java.io.IOException;
24  import java.util.Enumeration;
25  
26  import org.apache.directory.server.kerberos.shared.messages.Encodable;
27  import org.apache.directory.server.kerberos.shared.messages.components.EncKrbPrivPart;
28  import org.apache.directory.server.kerberos.shared.messages.components.EncKrbPrivPartModifier;
29  import org.apache.directory.shared.asn1.der.ASN1InputStream;
30  import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
31  import org.apache.directory.shared.asn1.der.DEREncodable;
32  import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
33  import org.apache.directory.shared.asn1.der.DERInteger;
34  import org.apache.directory.shared.asn1.der.DEROctetString;
35  import org.apache.directory.shared.asn1.der.DERSequence;
36  import org.apache.directory.shared.asn1.der.DERTaggedObject;
37  
38  
39  /**
40   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
41   * @version $Rev: 502338 $, $Date: 2007-02-01 20:59:43 +0100 (Do, 01 Feb 2007) $
42   */
43  public class EncKrbPrivPartDecoder implements Decoder, DecoderFactory
44  {
45      public Decoder getDecoder()
46      {
47          return new EncKrbPrivPartDecoder();
48      }
49  
50  
51      public Encodable decode( byte[] encodedPrivatePart ) throws IOException
52      {
53          ASN1InputStream ais = new ASN1InputStream( encodedPrivatePart );
54  
55          DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
56  
57          DERSequence privatePart = ( DERSequence ) app.getObject();
58  
59          return decodePrivatePartSequence( privatePart );
60      }
61  
62  
63      private EncKrbPrivPart decodePrivatePartSequence( DERSequence sequence )
64      {
65          EncKrbPrivPartModifier modifier = new EncKrbPrivPartModifier();
66  
67          for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
68          {
69              DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
70              int tag = object.getTagNo();
71              DEREncodable derObject = object.getObject();
72  
73              switch ( tag )
74              {
75                  case 0:
76                      DEROctetString tag0 = ( DEROctetString ) derObject;
77                      modifier.setUserData( tag0.getOctets() );
78                      break;
79                  case 1:
80                      DERGeneralizedTime tag1 = ( DERGeneralizedTime ) derObject;
81                      modifier.setTimestamp( KerberosTimeDecoder.decode( tag1 ) );
82                      break;
83                  case 2:
84                      DERInteger tag2 = ( DERInteger ) derObject;
85                      modifier.setMicroSecond( new Integer( tag2.intValue() ) );
86                      break;
87                  case 3:
88                      DERInteger tag3 = ( DERInteger ) derObject;
89                      modifier.setSequenceNumber( new Integer( tag3.intValue() ) );
90                      break;
91                  case 4:
92                      DERSequence tag4 = ( DERSequence ) derObject;
93                      modifier.setSenderAddress( HostAddressDecoder.decode( tag4 ) );
94                      break;
95                  case 5:
96                      DERSequence tag5 = ( DERSequence ) derObject;
97                      modifier.setRecipientAddress( HostAddressDecoder.decode( tag5 ) );
98                      break;
99              }
100         }
101         return modifier.getEncKrbPrivPart();
102     }
103 }