001/* 002 * This file is part of the iText (R) project. 003 * Copyright (c) 1998-2011 1T3XT BVBA 004 * Authors: Bruno Lowagie, Paulo Soares, et al. 005 * 006 * This program is free software; you can redistribute it and/or modify 007 * it under the terms of the GNU Affero General Public License version 3 008 * as published by the Free Software Foundation with the addition of the 009 * following permission added to Section 15 as permitted in Section 7(a): 010 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 011 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 012 * 013 * This program is distributed in the hope that it will be useful, but 014 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 015 * or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Affero General Public License for more details. 017 * You should have received a copy of the GNU Affero General Public License 018 * along with this program; if not, see http://www.gnu.org/licenses or write to 019 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 020 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 021 * http://itextpdf.com/terms-of-use/ 022 * 023 * The interactive user interfaces in modified source and object code versions 024 * of this program must display Appropriate Legal Notices, as required under 025 * Section 5 of the GNU Affero General Public License. 026 * 027 * In accordance with Section 7(b) of the GNU Affero General Public License, 028 * a covered work must retain the producer line in every PDF that is created 029 * or manipulated using iText. 030 * 031 * You can be released from the requirements of the license by purchasing 032 * a commercial license. Buying such a license is mandatory as soon as you 033 * develop commercial activities involving the iText software without 034 * disclosing the source code of your own applications. 035 * These activities include: offering paid services to customers as an ASP, 036 * serving PDFs on the fly in a web application, shipping iText with a closed 037 * source product. 038 * 039 * For more information, please contact iText Software Corp. at this 040 * address: sales@itextpdf.com 041 */ 042package com.itextpdf.text.pdf.crypto; 043 044import org.bouncycastle.crypto.BlockCipher; 045import org.bouncycastle.crypto.engines.AESFastEngine; 046import org.bouncycastle.crypto.modes.CBCBlockCipher; 047import org.bouncycastle.crypto.params.KeyParameter; 048 049/** 050 * Creates an AES Cipher with CBC and no padding. 051 * @author Paulo Soares 052 */ 053public class AESCipherCBCnoPad { 054 private BlockCipher cbc; 055 056 /** Creates a new instance of AESCipher */ 057 public AESCipherCBCnoPad(boolean forEncryption, byte[] key) { 058 BlockCipher aes = new AESFastEngine(); 059 cbc = new CBCBlockCipher(aes); 060 KeyParameter kp = new KeyParameter(key); 061 cbc.init(forEncryption, kp); 062 } 063 064 public byte[] processBlock(byte[] inp, int inpOff, int inpLen) { 065 if ((inpLen % cbc.getBlockSize()) != 0) 066 throw new IllegalArgumentException("Not multiple of block: " + inpLen); 067 byte[] outp = new byte[inpLen]; 068 int baseOffset = 0; 069 while (inpLen > 0) { 070 cbc.processBlock(inp, inpOff, outp, baseOffset); 071 inpLen -= cbc.getBlockSize(); 072 baseOffset += cbc.getBlockSize(); 073 inpOff += cbc.getBlockSize(); 074 } 075 return outp; 076 } 077}