105 lines
4.2 KiB
C#
105 lines
4.2 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Modes;
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using Org.BouncyCastle.Crypto.Paddings;
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using Org.BouncyCastle.Crypto.Engines;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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/*
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* $Id: AESCipher.cs,v 1.4 2007/03/06 12:29:31 psoares33 Exp $
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*
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* Copyright 2006 Paulo Soares
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf.crypto {
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/**
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* Creates an AES Cipher with CBC and padding PKCS5/7.
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* @author Paulo Soares (psoares@consiste.pt)
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*/
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public class AESCipher {
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private PaddedBufferedBlockCipher bp;
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/** Creates a new instance of AESCipher */
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public AESCipher(bool forEncryption, byte[] key, byte[] iv) {
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IBlockCipher aes = new AesFastEngine();
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IBlockCipher cbc = new CbcBlockCipher(aes);
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bp = new PaddedBufferedBlockCipher(cbc);
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KeyParameter kp = new KeyParameter(key);
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ParametersWithIV piv = new ParametersWithIV(kp, iv);
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bp.Init(forEncryption, piv);
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}
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public byte[] Update(byte[] inp, int inpOff, int inpLen) {
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int neededLen = bp.GetUpdateOutputSize(inpLen);
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byte[] outp = null;
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if (neededLen > 0)
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outp = new byte[neededLen];
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else
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neededLen = 0;
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bp.ProcessBytes(inp, inpOff, inpLen, outp, 0);
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return outp;
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}
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public byte[] DoFinal() {
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int neededLen = bp.GetOutputSize(0);
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byte[] outp = new byte[neededLen];
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int n = 0;
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try {
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n = bp.DoFinal(outp, 0);
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}
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catch {
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return outp;
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}
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if (n != outp.Length) {
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byte[] outp2 = new byte[n];
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System.Array.Copy(outp, 0, outp2, 0, n);
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return outp2;
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}
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else
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return outp;
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}
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}
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} |