/*
* $Id: AESCipher.java 2718 2007-04-25 21:12:47Z xlv $
*
* Copyright 2006 Paulo Soares
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf.crypto;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.engines.AESFastEngine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
/**
* Creates an AES Cipher with CBC and padding PKCS5/7.
* @author Paulo Soares (psoares@consiste.pt)
*/
public class AESCipher {
private PaddedBufferedBlockCipher bp;
/** Creates a new instance of AESCipher */
public AESCipher(boolean forEncryption, byte[] key, byte[] iv) {
BlockCipher aes = new AESFastEngine();
BlockCipher cbc = new CBCBlockCipher(aes);
bp = new PaddedBufferedBlockCipher(cbc);
KeyParameter kp = new KeyParameter(key);
ParametersWithIV piv = new ParametersWithIV(kp, iv);
bp.init(forEncryption, piv);
}
public byte[] update(byte[] inp, int inpOff, int inpLen) {
int neededLen = bp.getUpdateOutputSize(inpLen);
byte[] outp = null;
if (neededLen > 0)
outp = new byte[neededLen];
else
neededLen = 0;
bp.processBytes(inp, inpOff, inpLen, outp, 0);
return outp;
}
public byte[] doFinal() {
int neededLen = bp.getOutputSize(0);
byte[] outp = new byte[neededLen];
int n = 0;
try {
n = bp.doFinal(outp, 0);
} catch (Exception ex) {
return outp;
}
if (n != outp.length) {
byte[] outp2 = new byte[n];
System.arraycopy(outp, 0, outp2, 0, n);
return outp2;
}
else
return outp;
}
}