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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.PaData;
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: 587624 $, $Date: 2007-10-23 21:22:08 +0200 (Di, 23 Okt 2007) $
37   */
38  public class PreAuthenticationDataEncoder
39  {
40      /**
41       * Encodes an array of {@link PaData}s into a byte array.
42       *
43       * @param preAuth
44       * @return The byte array.
45       * @throws IOException
46       */
47      public static byte[] encode( PaData[] preAuth ) throws IOException
48      {
49          ByteArrayOutputStream baos = new ByteArrayOutputStream();
50          ASN1OutputStream aos = new ASN1OutputStream( baos );
51  
52          aos.writeObject( encodeSequence( preAuth ) );
53          aos.close();
54  
55          return baos.toByteArray();
56      }
57  
58  
59      /**
60       * METHOD-DATA     ::= SEQUENCE OF PA-DATA
61       */
62      protected static DERSequence encodeSequence( PaData[] preAuth )
63      {
64          DERSequence sequence = new DERSequence();
65  
66          for ( int ii = 0; ii < preAuth.length; ii++ )
67          {
68              sequence.add( encode( preAuth[ii] ) );
69          }
70  
71          return sequence;
72      }
73  
74  
75      /**
76       * PA-DATA ::=        SEQUENCE {
77       *         padata-type[1]        INTEGER,
78       *         padata-value[2]       OCTET STRING
79       * }
80       */
81      protected static DERSequence encode( PaData preAuth )
82      {
83          DERSequence sequence = new DERSequence();
84  
85          sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( preAuth.getPaDataType().getOrdinal() ) ) );
86  
87          if ( preAuth.getPaDataValue() != null )
88          {
89              sequence.add( new DERTaggedObject( 2, new DEROctetString( preAuth.getPaDataValue() ) ) );
90          }
91  
92          return sequence;
93      }
94  }