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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.
*/
/*****************************************************************************
OSSLDES.cpp
OpenSSL (3)DES implementation
*****************************************************************************/
#include "config.h"
#include "OSSLDES.h"
#include <algorithm>
#include "odd.h"
bool OSSLDES::wrapKey(const SymmetricKey* /*key*/, const SymWrap::Type /*mode*/, const ByteString& /*in*/, ByteString& /*out*/)
{
ERROR_MSG("DES does not support key wrapping");
return false;
}
bool OSSLDES::unwrapKey(const SymmetricKey* /*key*/, const SymWrap::Type /*mode*/, const ByteString& /*in*/, ByteString& /*out*/)
{
ERROR_MSG("DES does not support key unwrapping");
return false;
}
const EVP_CIPHER* OSSLDES::getCipher() const
{
if (currentKey == NULL) return NULL;
// Check currentKey bit length; 3DES only supports 56-bit, 112-bit or 168-bit keys
if (
#ifndef WITH_FIPS
(currentKey->getBitLen() != 56) &&
#endif
(currentKey->getBitLen() != 112) &&
(currentKey->getBitLen() != 168))
{
ERROR_MSG("Invalid DES currentKey length (%d bits)", currentKey->getBitLen());
return NULL;
}
// People shouldn't really be using 56-bit DES keys, generate a warning
if (currentKey->getBitLen() == 56)
{
DEBUG_MSG("CAUTION: use of 56-bit DES keys is not recommended!");
}
// Determine the cipher mode
if (currentCipherMode == SymMode::CBC)
{
switch(currentKey->getBitLen())
{
case 56:
return EVP_des_cbc();
case 112:
return EVP_des_ede_cbc();
case 168:
return EVP_des_ede3_cbc();
};
}
else if (currentCipherMode == SymMode::ECB)
{
switch(currentKey->getBitLen())
{
case 56:
return EVP_des_ecb();
case 112:
return EVP_des_ede_ecb();
case 168:
return EVP_des_ede3_ecb();
};
}
else if (currentCipherMode == SymMode::OFB)
{
switch(currentKey->getBitLen())
{
case 56:
return EVP_des_ofb();
case 112:
return EVP_des_ede_ofb();
case 168:
return EVP_des_ede3_ofb();
};
}
else if (currentCipherMode == SymMode::CFB)
{
switch(currentKey->getBitLen())
{
case 56:
return EVP_des_cfb();
case 112:
return EVP_des_ede_cfb();
case 168:
return EVP_des_ede3_cfb();
};
}
ERROR_MSG("Invalid DES cipher mode %i", currentCipherMode);
return NULL;
}
bool OSSLDES::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 OSSLDES::getBlockSize() const
{
// The block size is 64 bits
return 64 >> 3;
}
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