112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $Id: CryptoEngine.cpp,v 1.1.1.1 2000/06/16 18:46:21 thorpej Exp $ */
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#include <Windows.h>
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#include "CryptoEngine.h"
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CryptoEngine::CryptoEngine(des_cblock* key)
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{
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for (int i = 0; i < 8; i++)
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mSessionKey[i] = (*key)[i];
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des_set_key (&mSessionKey, mDesSchedule);
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mIVEncCount = mIVDecCount = 0;
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lastIn = 0;
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}
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CryptoEngine::~CryptoEngine()
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{
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if(lastIn)
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delete[] lastIn;
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}
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void
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CryptoEngine::Encrypt(pUChar in, pUChar out, long length) // pUChar = unsigned char*
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{
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des_cfb64_encrypt(in, out, length, mDesSchedule, &mEncInitVec, &mIVEncCount, DES_ENCRYPT);
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}
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void
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CryptoEngine::Decrypt(pUChar in, pUChar out, long length)
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{
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// Save variables for UndoDecrypt.
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if(lastIn)
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{
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delete[] lastIn;
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lastIn = 0;
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}
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lastIn = new UChar[length];
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CopyMemory(lastIn, in, length);
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lastLength = length;
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CopyMemory(mLastDecInitVec, mDecInitVec, sizeof(mDecInitVec));
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mLastIVDecCount = mIVDecCount;
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// Ok, Let's go cipher jkGs!".-&eEq¤*
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des_cfb64_encrypt(in, out, length, mDesSchedule, &mDecInitVec, &mIVDecCount, DES_DECRYPT);
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}
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void
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CryptoEngine::RandData(pUChar in, int length)
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{
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for(int i=0; i<length; i+=8)
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{
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des_cblock data;
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int size = sizeof(data);
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des_generate_random_block(&data);
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if(i+size > length) size = length - i;
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CopyMemory(in+i, data, size);
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}
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}
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void CryptoEngine::UndoDecrypt(pUChar out, long length)
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{
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if(lastIn)
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{
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// Restore variables.
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CopyMemory(mDecInitVec,mLastDecInitVec, sizeof(mDecInitVec));
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mIVDecCount = mLastIVDecCount;
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// Redo decryption, to proper length.
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des_cfb64_encrypt( lastIn, lastIn, lastLength - length,
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mDesSchedule, &mDecInitVec, &mIVDecCount, DES_DECRYPT);
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// Copy clear text.
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CopyMemory(out, lastIn+lastLength-length, length);
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delete[] lastIn;
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lastIn = 0;
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}
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}
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