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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.EncryptedData;
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: 587682 $, $Date: 2007-10-24 00:47:43 +0200 (Mi, 24 Okt 2007) $
37   */
38  public class EncryptedDataEncoder
39  {
40      /**
41       * Encodes an {@link EncryptedData} into a byte array.
42       *
43       * @param encryptedData
44       * @return The byte array.
45       * @throws IOException
46       */
47      public static byte[] encode( EncryptedData encryptedData ) throws IOException
48      {
49          ByteArrayOutputStream baos = new ByteArrayOutputStream();
50          ASN1OutputStream aos = new ASN1OutputStream( baos );
51  
52          aos.writeObject( encodeSequence( encryptedData ) );
53          aos.close();
54  
55          return baos.toByteArray();
56      }
57  
58  
59      /**
60       * Encodes an {@link EncryptedData} into a {@link DERSequence}.
61       * 
62       * EncryptedData ::=   SEQUENCE {
63       *             etype[0]     INTEGER, -- EncryptionEngine
64       *             kvno[1]      INTEGER OPTIONAL,
65       *             cipher[2]    OCTET STRING -- ciphertext
66       * }
67       * 
68       * @param encryptedData 
69       * @return The {@link DERSequence}.
70       */
71      public static DERSequence encodeSequence( EncryptedData encryptedData )
72      {
73          DERSequence sequence = new DERSequence();
74  
75          sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( encryptedData.getEType().getOrdinal() ) ) );
76  
77          if ( encryptedData.hasKvno() )
78          {
79              sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( encryptedData.getKvno() ) ) );
80          }
81  
82          sequence.add( new DERTaggedObject( 2, new DEROctetString( encryptedData.getCipher() ) ) );
83  
84          return sequence;
85      }
86  }