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// --------------------------------------------------------------------------
//
// File
// Name: CipherBlowfish.cpp
// Purpose: Blowfish cipher description
// Created: 1/12/03
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <openssl/evp.h>
#ifdef HAVE_OLD_SSL
#include <string.h>
#include <strings.h>
#endif
#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
#include "CipherBlowfish.h"
#include "CipherException.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: CipherBlowfish::CipherBlowfish(CipherDescription::CipherMode, const void *, unsigned int, const void *)
// Purpose: Constructor -- note key material and IV are not copied. KeyLength in bytes.
// Created: 1/12/03
//
// --------------------------------------------------------------------------
CipherBlowfish::CipherBlowfish(CipherDescription::CipherMode Mode, const void *pKey, unsigned int KeyLength, const void *pInitialisationVector)
: CipherDescription(),
mMode(Mode)
#ifndef HAVE_OLD_SSL
, mpKey(pKey),
mKeyLength(KeyLength),
mpInitialisationVector(pInitialisationVector)
{
}
#else
{
mKey.assign((const char *)pKey, KeyLength);
if(pInitialisationVector == 0)
{
bzero(mInitialisationVector, sizeof(mInitialisationVector));
}
else
{
::memcpy(mInitialisationVector, pInitialisationVector, sizeof(mInitialisationVector));
}
}
#endif
// --------------------------------------------------------------------------
//
// Function
// Name: CipherBlowfish::CipherBlowfish(const CipherBlowfish &)
// Purpose: Copy constructor
// Created: 1/12/03
//
// --------------------------------------------------------------------------
CipherBlowfish::CipherBlowfish(const CipherBlowfish &rToCopy)
: CipherDescription(rToCopy),
mMode(rToCopy.mMode),
#ifndef HAVE_OLD_SSL
mpKey(rToCopy.mpKey),
mKeyLength(rToCopy.mKeyLength),
mpInitialisationVector(rToCopy.mpInitialisationVector)
{
}
#else
mKey(rToCopy.mKey)
{
::memcpy(mInitialisationVector, rToCopy.mInitialisationVector, sizeof(mInitialisationVector));
}
#endif
#ifdef HAVE_OLD_SSL
// Hack functions to support old OpenSSL API
CipherDescription *CipherBlowfish::Clone() const
{
return new CipherBlowfish(*this);
}
void CipherBlowfish::SetIV(const void *pIV)
{
if(pIV == 0)
{
bzero(mInitialisationVector, sizeof(mInitialisationVector));
}
else
{
::memcpy(mInitialisationVector, pIV, sizeof(mInitialisationVector));
}
}
#endif
// --------------------------------------------------------------------------
//
// Function
// Name: ~CipherBlowfish::CipherBlowfish()
// Purpose: Destructor
// Created: 1/12/03
//
// --------------------------------------------------------------------------
CipherBlowfish::~CipherBlowfish()
{
#ifdef HAVE_OLD_SSL
// Zero copy of key
for(unsigned int l = 0; l < mKey.size(); ++l)
{
mKey[l] = '\0';
}
#endif
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherBlowfish::operator=(const CipherBlowfish &)
// Purpose: Assignment operator
// Created: 1/12/03
//
// --------------------------------------------------------------------------
CipherBlowfish &CipherBlowfish::operator=(const CipherBlowfish &rToCopy)
{
CipherDescription::operator=(rToCopy);
mMode = rToCopy.mMode;
#ifndef HAVE_OLD_SSL
mpKey = rToCopy.mpKey;
mKeyLength = rToCopy.mKeyLength;
mpInitialisationVector = rToCopy.mpInitialisationVector;
#else
mKey = rToCopy.mKey;
::memcpy(mInitialisationVector, rToCopy.mInitialisationVector, sizeof(mInitialisationVector));
#endif
return *this;
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherBlowfish::GetCipher()
// Purpose: Returns cipher object
// Created: 1/12/03
//
// --------------------------------------------------------------------------
const EVP_CIPHER *CipherBlowfish::GetCipher() const
{
switch(mMode)
{
case CipherDescription::Mode_ECB:
return EVP_bf_ecb();
break;
case CipherDescription::Mode_CBC:
return EVP_bf_cbc();
break;
case CipherDescription::Mode_CFB:
return EVP_bf_cfb();
break;
case CipherDescription::Mode_OFB:
return EVP_bf_ofb();
break;
default:
break;
}
// Unknown!
THROW_EXCEPTION(CipherException, UnknownCipherMode)
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherBlowfish::SetupParameters(EVP_CIPHER_CTX *)
// Purpose: Set up various parameters for cipher
// Created: 1/12/03
//
// --------------------------------------------------------------------------
void CipherBlowfish::SetupParameters(EVP_CIPHER_CTX *pCipherContext) const
{
ASSERT(pCipherContext != 0);
// Set key length
#ifndef HAVE_OLD_SSL
if(EVP_CIPHER_CTX_set_key_length(pCipherContext, mKeyLength) != 1)
#else
if(EVP_CIPHER_CTX_set_key_length(pCipherContext, mKey.size()) != 1)
#endif
{
THROW_EXCEPTION(CipherException, EVPBadKeyLength)
}
// Set key
#ifndef HAVE_OLD_SSL
if(EVP_CipherInit_ex(pCipherContext, GetCipher(), NULL, (unsigned char*)mpKey, (unsigned char*)mpInitialisationVector, -1) != 1)
#else
if(EVP_CipherInit(pCipherContext, NULL, (unsigned char*)mKey.c_str(), (unsigned char*)mInitialisationVector, -1) != 1)
#endif
{
THROW_EXCEPTION(CipherException, EVPInitFailure)
}
}
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