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/*
* Copyright (c) 2010 SURFnet bv
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
DESKey.cpp
DES key class
*****************************************************************************/
#include "config.h"
#include "ByteString.h"
#include "Serialisable.h"
#include "DESKey.h"
#include "CryptoFactory.h"
// Set the key
bool DESKey::setKeyBits(const ByteString& keybits)
{
if (bitLen > 0)
{
// Check if the correct input data is supplied
size_t expectedLen = 0;
switch(bitLen)
{
case 56:
expectedLen = 8;
break;
case 112:
expectedLen = 16;
break;
case 168:
expectedLen = 24;
break;
};
// Check the length
if (keybits.size() != expectedLen)
{
return false;
}
}
keyData = keybits;
return true;
}
// Get key check value
ByteString DESKey::getKeyCheckValue() const
{
SymAlgo::Type algo = SymAlgo::Unknown;
ByteString iv;
ByteString data;
ByteString encryptedData;
ByteString encryptedFinal;
switch (this->getBitLen())
{
case 56:
algo = SymAlgo::DES;
break;
case 112:
case 168:
algo = SymAlgo::DES3;
break;
default:
return encryptedData;
}
SymmetricAlgorithm* cipher = CryptoFactory::i()->getSymmetricAlgorithm(algo);
if (cipher == NULL) return encryptedData;
// Single block of null (0x00) bytes
data.resize(cipher->getBlockSize());
memset(&data[0], 0, data.size());
if (!cipher->encryptInit(this, SymMode::ECB, iv, false) ||
!cipher->encryptUpdate(data, encryptedData) ||
!cipher->encryptFinal(encryptedFinal))
{
CryptoFactory::i()->recycleSymmetricAlgorithm(cipher);
return encryptedData;
}
CryptoFactory::i()->recycleSymmetricAlgorithm(cipher);
encryptedData += encryptedFinal;
encryptedData.resize(3);
return encryptedData;
}
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