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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 using AES hardware acceleration
/// This code is based on the AES reference implementation published by Paulo
/// Barreto and Vincent Rijmen.
///
/// !Usage
///
/// -# aes_hard_init: Initialize AES hardware
/// -# aes_hard_init_CBC: for the CBC mode
/// -# aes_hard_init_CTR: for the CTR mode
/// -# aes_hard_init_ECB: for the ECB mode
/// -# aes_hard_cleanup: Cleans up AES
/// -# aes_hard_decrypt: Decrypts a variable-length cipher text
//------------------------------------------------------------------------------
#ifndef BOOTLOADER_AES_HARDWARE_H
#define BOOTLOADER_AES_HARDWARE_H
//------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------
#include "config.h"
#if defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
//------------------------------------------------------------------------------
// Check configuration
//------------------------------------------------------------------------------
#if (ENCRYPTION_KEY_LENGTH != 16) && (ENCRYPTION_KEY_LENGTH != 24) \
&& (ENCRYPTION_KEY_LENGTH != 32)
#error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits keys.
#endif
#if (ENCRYPTION_BLOCK_LENGTH != 16)
#error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits blocks.
#endif
#if !defined(ENCRYPTION_ECB) && \
!defined(ENCRYPTION_CBC) && \
!defined(ENCRYPTION_CTR)
#error Only ECB, CBC & CTR modes are supported.
#endif
//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------
#ifdef ONLY_ONE_ENCRYPTION
#define ENCRYPTION_INIT aes_hard_init
#define ENCRYPTION_CLEANUP aes_hard_cleanup
#define ENCRYPTION_DECRYPT aes_hard_decrypt
#endif
//------------------------------------------------------------------------------
// Exported functions
//------------------------------------------------------------------------------
extern void aes_hard_init(void);
#ifndef ONLY_ONE_ENCRYPTION
extern void aes_hard_init_CBC(void);
extern void aes_hard_init_CTR(void);
extern void aes_hard_init_ECB(void);
#endif
extern void aes_hard_cleanup(void);
extern int aes_hard_decrypt(const unsigned char *, unsigned char *, unsigned int);
#endif // defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
#endif // BOOTLOADER_AES_HARDWARE_H
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