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Java > Open Source Codes > com > maverick > crypto > asn1 > DERSet


1 /*
2  * SSL-Explorer
3  *
4  * Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2 of
9  * the License, or (at your option) any later version.
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19             
20 package com.maverick.crypto.asn1;
21
22 import java.io.ByteArrayOutputStream JavaDoc;
23 import java.io.IOException JavaDoc;
24 import java.util.Enumeration JavaDoc;
25
26 /**
27  * A DER encoded set object
28  */
29 public class DERSet
30     extends ASN1Set
31 {
32     /**
33      * create an empty set
34      */
35     public DERSet()
36     {
37     }
38
39     /**
40      * @param obj - a single object that makes up the set.
41      */
42     public DERSet(
43         DEREncodable obj)
44     {
45         this.addObject(obj);
46     }
47
48     /**
49      * @param v - a vector of objects making up the set.
50      */
51     public DERSet(
52         DEREncodableVector v)
53     {
54         for (int i = 0; i != v.size(); i++)
55         {
56             this.addObject(v.get(i));
57         }
58     }
59
60     /*
61      * A note on the implementation:
62      * <p>
63      * As DER requires the constructed, definite-length model to
64      * be used for structured types, this varies slightly from the
65      * ASN.1 descriptions given. Rather than just outputing SET,
66      * we also have to specify CONSTRUCTED, and the objects length.
67      */
68     void encode(
69         DEROutputStream out)
70         throws IOException JavaDoc
71     {
72         ByteArrayOutputStream JavaDoc bOut = new ByteArrayOutputStream JavaDoc();
73         DEROutputStream dOut = new DEROutputStream(bOut);
74         Enumeration JavaDoc e = this.getObjects();
75
76         while (e.hasMoreElements())
77         {
78             Object JavaDoc obj = e.nextElement();
79
80             dOut.writeObject(obj);
81         }
82
83         dOut.close();
84
85         byte[] bytes = bOut.toByteArray();
86
87         out.writeEncoded(SET | CONSTRUCTED, bytes);
88     }
89 }
90
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