View Javadoc

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.encoder;
21  
22  
23  import java.io.ByteArrayOutputStream;
24  import java.io.IOException;
25  
26  import org.apache.directory.server.kerberos.shared.messages.value.EncryptionTypeInfoEntry;
27  import org.apache.directory.shared.asn1.der.ASN1OutputStream;
28  import org.apache.directory.shared.asn1.der.DERInteger;
29  import org.apache.directory.shared.asn1.der.DEROctetString;
30  import org.apache.directory.shared.asn1.der.DERSequence;
31  import org.apache.directory.shared.asn1.der.DERTaggedObject;
32  
33  
34  /**
35   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
36   * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Di, 22 Mai 2007) $
37   */
38  public class EncryptionTypeInfoEncoder
39  {
40      /**
41       * Encodes an array of {@link EncryptionTypeInfoEntry}s into a byte array.
42       *
43       * @param entries
44       * @return The byte array.
45       * @throws IOException
46       */
47      public static byte[] encode( EncryptionTypeInfoEntry[] entries ) throws IOException
48      {
49          ByteArrayOutputStream baos = new ByteArrayOutputStream();
50          ASN1OutputStream aos = new ASN1OutputStream( baos );
51          aos.writeObject( encodeSequence( entries ) );
52          aos.close();
53  
54          return baos.toByteArray();
55      }
56  
57  
58      /**
59       * ETYPE-INFO              ::= SEQUENCE OF ETYPE-INFO-ENTRY
60       */
61      protected static DERSequence encodeSequence( EncryptionTypeInfoEntry[] entries )
62      {
63          DERSequence sequence = new DERSequence();
64  
65          for ( int ii = 0; ii < entries.length; ii++ )
66          {
67              sequence.add( encode( entries[ii] ) );
68          }
69  
70          return sequence;
71      }
72  
73  
74      /**
75       * ETYPE-INFO-ENTRY        ::= SEQUENCE {
76       *     etype               [0] Int32,
77       *     salt                [1] OCTET STRING OPTIONAL
78       * }
79       */
80      protected static DERSequence encode( EncryptionTypeInfoEntry entry )
81      {
82          DERSequence sequence = new DERSequence();
83  
84          sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) );
85  
86          if ( entry.getSalt() != null )
87          {
88              sequence.add( new DERTaggedObject( 1, new DEROctetString( entry.getSalt() ) ) );
89          }
90  
91          return sequence;
92      }
93  }