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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.encoder;
21  
22  
23  import java.io.ByteArrayOutputStream;
24  import java.io.IOException;
25  
26  import org.apache.directory.server.kerberos.shared.messages.value.EncryptionTypeInfo2Entry;
27  import org.apache.directory.shared.asn1.der.ASN1OutputStream;
28  import org.apache.directory.shared.asn1.der.DERGeneralString;
29  import org.apache.directory.shared.asn1.der.DERInteger;
30  import org.apache.directory.shared.asn1.der.DEROctetString;
31  import org.apache.directory.shared.asn1.der.DERSequence;
32  import org.apache.directory.shared.asn1.der.DERTaggedObject;
33  
34  
35  /**
36   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
37   * @version $Rev: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
38   */
39  public class EncryptionTypeInfo2Encoder
40  {
41      /**
42       * Encodes an array of {@link EncryptionTypeInfo2Entry}s into a byte array.
43       *
44       * @param entries
45       * @return The byte array.
46       * @throws IOException
47       */
48      public static byte[] encode( EncryptionTypeInfo2Entry[] entries ) throws IOException
49      {
50          ByteArrayOutputStream baos = new ByteArrayOutputStream();
51          ASN1OutputStream aos = new ASN1OutputStream( baos );
52          aos.writeObject( encodeSequence( entries ) );
53          aos.close();
54  
55          return baos.toByteArray();
56      }
57  
58  
59      /**
60       * ETYPE-INFO2             ::= SEQUENCE SIZE (1..MAX) OF ETYPE-INFO2-ENTRY
61       */
62      protected static DERSequence encodeSequence( EncryptionTypeInfo2Entry[] entries )
63      {
64          DERSequence sequence = new DERSequence();
65  
66          for ( int ii = 0; ii < entries.length; ii++ )
67          {
68              sequence.add( encode( entries[ii] ) );
69          }
70  
71          return sequence;
72      }
73  
74  
75      /**
76       * ETYPE-INFO2-ENTRY       ::= SEQUENCE {
77       *         etype           [0] Int32,
78       *         salt            [1] KerberosString OPTIONAL,
79       *         s2kparams       [2] OCTET STRING OPTIONAL
80       * }
81       */
82      protected static DERSequence encode( EncryptionTypeInfo2Entry entry )
83      {
84          DERSequence sequence = new DERSequence();
85  
86          sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) );
87  
88          if ( entry.getSalt() != null )
89          {
90              sequence.add( new DERTaggedObject( 1, DERGeneralString.valueOf( entry.getSalt() ) ) );
91          }
92  
93          if ( entry.getS2kParams() != null )
94          {
95              sequence.add( new DERTaggedObject( 2, new DEROctetString( entry.getS2kParams() ) ) );
96          }
97  
98          return sequence;
99      }
100 }