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Java > Open Source Codes > org > pdfbox > pdmodel > encryption > ProtectionPolicy


1 /**
2  * Copyright (c) 2003-2005, www.pdfbox.org
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */
31
32 package org.pdfbox.pdmodel.encryption;
33
34 /**
35  * This class represents the protection policy to apply to a document.
36  *
37  * Objects implementing this abstract class can be passed to the protect method of PDDocument
38  * to protect a document.
39  *
40  * @see org.pdfbox.pdmodel.PDDocument#protect(ProtectionPolicy)
41  *
42  * @author Benoit Guillon (benoit.guillon@snv.jussieu.fr)
43  * @version $Revision: 1.2 $
44  */
45 public abstract class ProtectionPolicy
46 {
47
48     private static final int DEFAULT_KEY_LENGTH = 40;
49     
50     private int encryptionKeyLength = DEFAULT_KEY_LENGTH;
51     
52     /**
53      * set the length in (bits) of the secret key that will be
54      * used to encrypt document data.
55      * The default value is 40 bits, which provides a low security level
56      * but is compatible with old versions of Acrobat Reader.
57      *
58      * @param l the length in bits (must be 40 or 128)
59      */
60     public void setEncryptionKeyLength(int l)
61     {
62         if(l!=40 && l!=128)
63         {
64             throw new RuntimeException JavaDoc("Invalid key length");
65         }
66         encryptionKeyLength = l;
67     }
68     
69     /**
70      * Get the length of the secrete key that will be used to encrypt
71      * document data.
72      *
73      * @return The length (in bits) of the encryption key.
74      */
75     public int getEncryptionKeyLength()
76     {
77         return encryptionKeyLength;
78     }
79 }
80
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