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// --------------------------------------------------------------------------
//
// File
// Name: CipherAES.cpp
// Purpose: AES cipher description
// Created: 27/4/04
//
// --------------------------------------------------------------------------
#include "Box.h"
// Only available in new versions of openssl
#ifndef HAVE_OLD_SSL
#include <openssl/evp.h>
#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
#include "CipherAES.h"
#include "CipherException.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: CipherAES::CipherAES(CipherDescription::CipherMode, const void *, unsigned int, const void *)
// Purpose: Constructor -- note key material and IV are not copied. KeyLength in bytes.
// Created: 27/4/04
//
// --------------------------------------------------------------------------
CipherAES::CipherAES(CipherDescription::CipherMode Mode, const void *pKey, unsigned int KeyLength, const void *pInitialisationVector)
: CipherDescription(),
mMode(Mode),
mpKey(pKey),
mKeyLength(KeyLength),
mpInitialisationVector(pInitialisationVector)
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherAES::CipherAES(const CipherAES &)
// Purpose: Copy constructor
// Created: 27/4/04
//
// --------------------------------------------------------------------------
CipherAES::CipherAES(const CipherAES &rToCopy)
: CipherDescription(rToCopy),
mMode(rToCopy.mMode),
mpKey(rToCopy.mpKey),
mKeyLength(rToCopy.mKeyLength),
mpInitialisationVector(rToCopy.mpInitialisationVector)
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: ~CipherAES::CipherAES()
// Purpose: Destructor
// Created: 27/4/04
//
// --------------------------------------------------------------------------
CipherAES::~CipherAES()
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherAES::operator=(const CipherAES &)
// Purpose: Assignment operator
// Created: 27/4/04
//
// --------------------------------------------------------------------------
CipherAES &CipherAES::operator=(const CipherAES &rToCopy)
{
CipherDescription::operator=(rToCopy);
mMode = rToCopy.mMode;
mpKey = rToCopy.mpKey;
mKeyLength = rToCopy.mKeyLength;
mpInitialisationVector = rToCopy.mpInitialisationVector;
return *this;
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherAES::GetCipher()
// Purpose: Returns cipher object
// Created: 27/4/04
//
// --------------------------------------------------------------------------
const EVP_CIPHER *CipherAES::GetCipher() const
{
switch(mMode)
{
case CipherDescription::Mode_ECB:
switch(mKeyLength)
{
case (128/8): return EVP_aes_128_ecb(); break;
case (192/8): return EVP_aes_192_ecb(); break;
case (256/8): return EVP_aes_256_ecb(); break;
default:
THROW_EXCEPTION(CipherException, EVPBadKeyLength)
break;
}
break;
case CipherDescription::Mode_CBC:
switch(mKeyLength)
{
case (128/8): return EVP_aes_128_cbc(); break;
case (192/8): return EVP_aes_192_cbc(); break;
case (256/8): return EVP_aes_256_cbc(); break;
default:
THROW_EXCEPTION(CipherException, EVPBadKeyLength)
break;
}
break;
default:
break;
}
// Unknown!
THROW_EXCEPTION(CipherException, UnknownCipherMode)
}
// --------------------------------------------------------------------------
//
// Function
// Name: CipherAES::SetupParameters(EVP_CIPHER_CTX *)
// Purpose: Set up various parameters for cipher
// Created: 27/4/04
//
// --------------------------------------------------------------------------
void CipherAES::SetupParameters(EVP_CIPHER_CTX *pCipherContext) const
{
ASSERT(pCipherContext != 0);
// Set key (key length is implied)
if(EVP_CipherInit_ex(pCipherContext, NULL, NULL, (unsigned char*)mpKey, (unsigned char*)mpInitialisationVector, -1) != 1)
{
THROW_EXCEPTION(CipherException, EVPInitFailure)
}
}
#endif // n HAVE_OLD_SSL
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