Source Code Cross Referenced for IVGenerator.java in  » PDF » pdf-itext » com » lowagie » text » pdf » crypto » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » PDF » pdf itext » com.lowagie.text.pdf.crypto 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $Id: IVGenerator.java 2699 2007-04-19 12:19:40Z blowagie $
03:         *
04:         * Copyright 2006 Paulo Soares
05:         *
06:         * The contents of this file are subject to the Mozilla Public License Version 1.1
07:         * (the "License"); you may not use this file except in compliance with the License.
08:         * You may obtain a copy of the License at http://www.mozilla.org/MPL/
09:         *
10:         * Software distributed under the License is distributed on an "AS IS" basis,
11:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12:         * for the specific language governing rights and limitations under the License.
13:         *
14:         * The Original Code is 'iText, a free JAVA-PDF library'.
15:         *
16:         * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
17:         * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
18:         * All Rights Reserved.
19:         * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
20:         * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
21:         *
22:         * Contributor(s): all the names of the contributors are added in the source code
23:         * where applicable.
24:         *
25:         * Alternatively, the contents of this file may be used under the terms of the
26:         * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
27:         * provisions of LGPL are applicable instead of those above.  If you wish to
28:         * allow use of your version of this file only under the terms of the LGPL
29:         * License and not to allow others to use your version of this file under
30:         * the MPL, indicate your decision by deleting the provisions above and
31:         * replace them with the notice and other provisions required by the LGPL.
32:         * If you do not delete the provisions above, a recipient may use your version
33:         * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
34:         *
35:         * This library is free software; you can redistribute it and/or modify it
36:         * under the terms of the MPL as stated above or under the terms of the GNU
37:         * Library General Public License as published by the Free Software Foundation;
38:         * either version 2 of the License, or any later version.
39:         *
40:         * This library is distributed in the hope that it will be useful, but WITHOUT
41:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
42:         * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
43:         * details.
44:         *
45:         * If you didn't download this code from the following link, you should check if
46:         * you aren't using an obsolete version:
47:         * http://www.lowagie.com/iText/
48:         */
49:        package com.lowagie.text.pdf.crypto;
50:
51:        /**
52:         * An initialization vector generator for a CBC block encryption. It's a random generator based on ARCFOUR.
53:         * @author Paulo Soares (psoares@consiste.pt)
54:         */
55:        public class IVGenerator {
56:
57:            private static ARCFOUREncryption arcfour;
58:
59:            static {
60:                arcfour = new ARCFOUREncryption();
61:                long time = System.currentTimeMillis();
62:                long mem = Runtime.getRuntime().freeMemory();
63:                String s = time + "+" + mem;
64:                arcfour.prepareARCFOURKey(s.getBytes());
65:            }
66:
67:            /** Creates a new instance of IVGenerator */
68:            private IVGenerator() {
69:            }
70:
71:            /**
72:             * Gets a 16 byte random initialization vector.
73:             * @return a 16 byte random initialization vector
74:             */
75:            public static byte[] getIV() {
76:                return getIV(16);
77:            }
78:
79:            /**
80:             * Gets a random initialization vector.
81:             * @param len the length of the initialization vector
82:             * @return a random initialization vector
83:             */
84:            public static byte[] getIV(int len) {
85:                byte[] b = new byte[len];
86:                synchronized (arcfour) {
87:                    arcfour.encryptARCFOUR(b);
88:                }
89:                return b;
90:            }
91:        }
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