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/*
* Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
* 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.
*/
/*****************************************************************************
BotanDES.cpp
Botan (3)DES implementation
*****************************************************************************/
#include "config.h"
#include "BotanDES.h"
#include <algorithm>
#include "odd.h"
bool BotanDES::wrapKey(const SymmetricKey* /*key*/, const SymWrap::Type /*mode*/, const ByteString& /*in*/, ByteString& /*out*/)
{
ERROR_MSG("DES does not support key wrapping");
return false;
}
bool BotanDES::unwrapKey(const SymmetricKey* /*key*/, const SymWrap::Type /*mode*/, const ByteString& /*in*/, ByteString& /*out*/)
{
ERROR_MSG("DES does not support key unwrapping");
return false;
}
std::string BotanDES::getCipher() const
{
std::string algo;
std::string mode;
std::string padding;
if (currentKey == NULL) return "";
// Check currentKey bit length; 3DES only supports 56-bit, 112-bit or 168-bit keys
switch (currentKey->getBitLen())
{
case 56:
// People shouldn't really be using 56-bit DES keys, generate a warning
DEBUG_MSG("CAUTION: use of 56-bit DES keys is not recommended!");
algo = "DES";
break;
case 112:
case 168:
algo = "TripleDES";
break;
default:
ERROR_MSG("Invalid DES currentKey length (%d bits)", currentKey->getBitLen());
return "";
}
// Determine the cipher mode
switch (currentCipherMode)
{
case SymMode::CBC:
mode = "CBC";
break;
case SymMode::CFB:
mode = "CFB";
break;
case SymMode::ECB:
mode = "ECB";
break;
case SymMode::OFB:
mode = "OFB";
break;
default:
ERROR_MSG("Invalid DES cipher mode %i", currentCipherMode);
return "";
}
// Check padding mode
if (currentCipherMode == SymMode::OFB ||
currentCipherMode == SymMode::CFB)
{
padding = "";
}
else if (currentPaddingMode)
{
padding = "/PKCS7";
}
else
{
padding = "/NoPadding";
}
return algo + "/" + mode + padding;
}
bool BotanDES::generateKey(SymmetricKey& key, RNG* rng /* = NULL */)
{
if (rng == NULL)
{
return false;
}
if (key.getBitLen() == 0)
{
return false;
}
ByteString keyBits;
// don't count parity bit
if (!rng->generateRandom(keyBits, key.getBitLen()/7))
{
return false;
}
// fix the odd parity
size_t i;
for (i = 0; i < keyBits.size(); i++)
{
keyBits[i] = odd_parity[keyBits[i]];
}
return key.setKeyBits(keyBits);
}
size_t BotanDES::getBlockSize() const
{
// The block size is 64 bits
return 64 >> 3;
}
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