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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
/// \unit
///
/// !Purpose
///
/// Firmware encryption
///
/// !Usage
///
/// This file must include the header of every encryption module implemented for
/// the bootloader. It is also responsible for defining mock functions if no
/// encryption module is selected, as well as checking that parameters are
/// correctly set.
//
/// An encryption module must define the following functions:
/// -# void encryption_init(void);
/// -# void encryption_cleanup(void);
/// -# int encryption_decrypt(const unsigned char *, unsigned char *, unsigned int)
//------------------------------------------------------------------------------
#ifndef BOOTLOADER_ENCRYPTION_H
#define BOOTLOADER_ENCRYPTION_H
//------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------
#include "config.h"
//------------------------------------------------------------------------------
// Check configuration
//------------------------------------------------------------------------------
#ifdef ONLY_ONE_ENCRYPTION
#if !defined(ENCRYPTION_INIT) && !defined(USE_ENCRYPTION)
#define ENCRYPTION_INIT();
#define ENCRYPTION_CLEANUP();
#define ENCRYPTION_DECRYPT(...) 1
#elif !defined(ENCRYPTION_INIT) && defined(USE_ENCRYPTION)
#error USE_ENCRYPTION defined but no encryption method selected.
#elif !defined(ENCRYPTION_AES_LTC) && \
!defined(ENCRYPTION_AES_REF) && \
!defined(ENCRYPTION_AES_HARD) && \
!defined(ENCRYPTION_3DES_LTC) && \
!defined(ENCRYPTION_3DES_HARD)
#error No algorithm selected.
#elif !defined(ENCRYPTION_ECB) && \
!defined(ENCRYPTION_CBC) && \
!defined(ENCRYPTION_CTR)
#error No encryption mode selected.
#elif !defined(ENCRYPTION_KEY)
#error No key defined.
#elif !defined(ENCRYPTION_KEY_LENGTH)
#error No key length selected.
#elif !defined(ENCRYPTION_IV)
#error No initialization vector defined.
#elif !defined(ENCRYPTION_BLOCK_LENGTH)
#error No block length selected.
#endif
#endif // ONLY_ONE_ENCRYPTION
#endif // BOOTLOADER_ENCRYPTION_H
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