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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