// distribution boxbackup-0.11.1 (svn version: 2821_2827)
// Box Backup, http://www.boxbackup.org/
// 
// Copyright (c) 2003-2010, Ben Summers and contributors.
// All rights reserved.
// 
// Note that this project uses mixed licensing. Any file with this license
// attached, or where the code LICENSE-DUAL appears on the first line, falls
// under this license. See the file COPYING.txt for more information.
// 
// This file is dual licensed. You may use and distribute it providing that you
// comply EITHER with the terms of the BSD license, OR the GPL license. It is
// not necessary to comply with both licenses, only one.
// 
// The BSD license option follows:
// 
// 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.
//  
// 3. Neither the name of the Box Backup nor the names of its contributors may
//    be used to endorse or promote products derived from this software without
//    specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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.
// 
// [http://en.wikipedia.org/wiki/BSD_licenses#3-clause_license_.28.22New_BSD_License.22.29]
// 
// The GPL license option follows:
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
// 
// [http://www.gnu.org/licenses/old-licenses/gpl-2.0.html#SEC4]
// --------------------------------------------------------------------------
//
// 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

