/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
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//------------------------------------------------------------------------------
/// \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