DERSet


1   /**
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  package org.apache.geronimo.util.asn1;
19  
20  import java.io.ByteArrayOutputStream  ;
21  import java.io.IOException  ;
22  import java.util.Enumeration  ;
23  
24  /**
25   * A DER encoded set object
26   */
27  public class DERSet
28      extends ASN1Set
29  {
30      /**
31       * create an empty set
32       */
33      public DERSet()
34      {
35      }
36  
37      /**
38       * @param obj - a single object that makes up the set.
39       */
40      public DERSet(
41          DEREncodable   obj)
42      {
43          this.addObject(obj);
44      }
45  
46      /**
47       * @param v - a vector of objects making up the set.
48       */
49      public DERSet(
50          DEREncodableVector   v)
51      {
52          this(v, true);
53      }
54  
55      /**
56       * create a set from an array of objects.
57       */
58      public DERSet(
59          ASN1Encodable[]   a)
60      {
61          for (int i = 0; i != a.length; i++)
62          {
63              this.addObject(a[i]);
64          }
65  
66          this.sort();
67      }
68  
69      /**
70       * @param v - a vector of objects making up the set.
71       */
72      DERSet(
73          DEREncodableVector   v,
74          boolean              needsSorting)
75      {
76          for (int i = 0; i != v.size(); i++)
77          {
78              this.addObject(v.get(i));
79          }
80  
81          if (needsSorting)
82          {
83              this.sort();
84          }
85      }
86  
87      /*
88       * A note on the implementation:
89       * <p>
90       * As DER requires the constructed, definite-length model to
91       * be used for structured types, this varies slightly from the
92       * ASN.1 descriptions given. Rather than just outputing SET,
93       * we also have to specify CONSTRUCTED, and the objects length.
94       */
95      void encode(
96          DEROutputStream out)
97          throws IOException  
98      {
99          ByteArrayOutputStream     bOut = new ByteArrayOutputStream  ();
100         DEROutputStream         dOut = new DEROutputStream(bOut);
101         Enumeration               e = this.getObjects();
102 
103         while (e.hasMoreElements())
104         {
105             Object      obj = e.nextElement();
106 
107             dOut.writeObject(obj);
108         }
109 
110         dOut.close();
111 
112         byte[]  bytes = bOut.toByteArray();
113 
114         out.writeEncoded(SET | CONSTRUCTED, bytes);
115     }
116 }
117
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