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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.util.Enumeration;
24  import java.util.HashSet;
25  import java.util.Set;
26  
27  import org.apache.directory.server.kerberos.shared.crypto.encryption.EncryptionType;
28  import org.apache.directory.shared.asn1.der.DEREncodable;
29  import org.apache.directory.shared.asn1.der.DERInteger;
30  import org.apache.directory.shared.asn1.der.DERSequence;
31  
32  
33  /**
34   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35   * @version $Rev: 590715 $, $Date: 2007-10-31 16:23:32 +0100 (Mi, 31 Okt 2007) $
36   */
37  public class EncryptionTypeDecoder
38  {
39      /**
40       * etype[8]             SEQUENCE OF INTEGER, -- EncryptionType,
41       *             -- in preference order
42       */
43      protected static Set<EncryptionType> decode( DERSequence sequence )
44      {
45          Set<EncryptionType> eTypes = new HashSet<EncryptionType>( sequence.size() );
46  
47          int ii = 0;
48          
49          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
50          {
51              DERInteger object = ( DERInteger ) e.nextElement();
52              eTypes.add( EncryptionType.getTypeByOrdinal( object.intValue() ) );
53              ii++;
54          }
55  
56          return eTypes;
57      }
58  }