Source Code Cross Referenced for AESCipher.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) 


001:        /*
002:         * $Id: AESCipher.java 2718 2007-04-25 21:12:47Z xlv $
003:         *
004:         * Copyright 2006 Paulo Soares
005:         *
006:         * The contents of this file are subject to the Mozilla Public License Version 1.1
007:         * (the "License"); you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at http://www.mozilla.org/MPL/
009:         *
010:         * Software distributed under the License is distributed on an "AS IS" basis,
011:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
012:         * for the specific language governing rights and limitations under the License.
013:         *
014:         * The Original Code is 'iText, a free JAVA-PDF library'.
015:         *
016:         * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
017:         * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
018:         * All Rights Reserved.
019:         * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
020:         * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
021:         *
022:         * Contributor(s): all the names of the contributors are added in the source code
023:         * where applicable.
024:         *
025:         * Alternatively, the contents of this file may be used under the terms of the
026:         * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
027:         * provisions of LGPL are applicable instead of those above.  If you wish to
028:         * allow use of your version of this file only under the terms of the LGPL
029:         * License and not to allow others to use your version of this file under
030:         * the MPL, indicate your decision by deleting the provisions above and
031:         * replace them with the notice and other provisions required by the LGPL.
032:         * If you do not delete the provisions above, a recipient may use your version
033:         * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
034:         *
035:         * This library is free software; you can redistribute it and/or modify it
036:         * under the terms of the MPL as stated above or under the terms of the GNU
037:         * Library General Public License as published by the Free Software Foundation;
038:         * either version 2 of the License, or any later version.
039:         *
040:         * This library is distributed in the hope that it will be useful, but WITHOUT
041:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
042:         * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
043:         * details.
044:         *
045:         * If you didn't download this code from the following link, you should check if
046:         * you aren't using an obsolete version:
047:         * http://www.lowagie.com/iText/
048:         */
049:        package com.lowagie.text.pdf.crypto;
050:
051:        import org.bouncycastle.crypto.BlockCipher;
052:        import org.bouncycastle.crypto.engines.AESFastEngine;
053:        import org.bouncycastle.crypto.modes.CBCBlockCipher;
054:        import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
055:        import org.bouncycastle.crypto.params.KeyParameter;
056:        import org.bouncycastle.crypto.params.ParametersWithIV;
057:
058:        /**
059:         * Creates an AES Cipher with CBC and padding PKCS5/7.
060:         * @author Paulo Soares (psoares@consiste.pt)
061:         */
062:        public class AESCipher {
063:            private PaddedBufferedBlockCipher bp;
064:
065:            /** Creates a new instance of AESCipher */
066:            public AESCipher(boolean forEncryption, byte[] key, byte[] iv) {
067:                BlockCipher aes = new AESFastEngine();
068:                BlockCipher cbc = new CBCBlockCipher(aes);
069:                bp = new PaddedBufferedBlockCipher(cbc);
070:                KeyParameter kp = new KeyParameter(key);
071:                ParametersWithIV piv = new ParametersWithIV(kp, iv);
072:                bp.init(forEncryption, piv);
073:            }
074:
075:            public byte[] update(byte[] inp, int inpOff, int inpLen) {
076:                int neededLen = bp.getUpdateOutputSize(inpLen);
077:                byte[] outp = null;
078:                if (neededLen > 0)
079:                    outp = new byte[neededLen];
080:                else
081:                    neededLen = 0;
082:                bp.processBytes(inp, inpOff, inpLen, outp, 0);
083:                return outp;
084:            }
085:
086:            public byte[] doFinal() {
087:                int neededLen = bp.getOutputSize(0);
088:                byte[] outp = new byte[neededLen];
089:                int n = 0;
090:                try {
091:                    n = bp.doFinal(outp, 0);
092:                } catch (Exception ex) {
093:                    return outp;
094:                }
095:                if (n != outp.length) {
096:                    byte[] outp2 = new byte[n];
097:                    System.arraycopy(outp, 0, outp2, 0, n);
098:                    return outp2;
099:                } else
100:                    return outp;
101:            }
102:
103:        }
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