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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 libTomCrypt
///
/// !Usage
///
/// -# ltc_init: Initialize LibTomCrypt
/// -# ltc_init_AES_CBC
/// -# ltc_init_AES_CTR
/// -# ltc_init_AES_ECB
/// -# ltc_init_3DES_CBC
/// -# ltc_init_3DES_CTR
/// -# ltc_init_3DES_ECB
/// -# ltc_cleanup
/// -# ltc_cleanup_CBC
/// -# ltc_cleanup_CTR
/// -# ltc_cleanup_ECB
/// -# ltc_decrypt
/// -# ltc_decrypt_CBC
/// -# ltc_decrypt_CTR
/// -# ltc_decrypt_ECB
//------------------------------------------------------------------------------
#ifndef BOOTLOADER_LIBTOMCRYPT_H
#define BOOTLOADER_LIBTOMCRYPT_H
//------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------
#include "config.h"
#if defined(USE_ENCRYPTION) && (defined(ENCRYPTION_AES_LTC) || defined(ENCRYPTION_3DES_LTC))
//------------------------------------------------------------------------------
// Check configuration
//------------------------------------------------------------------------------
// Supported modes
#if !defined(ENCRYPTION_CTR) && \
!defined(ENCRYPTION_CBC) && \
!defined(ENCRYPTION_ECB)
#error No other mode than ECB, CBC & CTR are supported.
#endif
// Supported key length
#if defined(ENCRYPTION_AES_LTC)
#if (ENCRYPTION_KEY_LENGTH != 16) && \
(ENCRYPTION_KEY_LENGTH != 24) && \
(ENCRYPTION_KEY_LENGTH != 32)
#error Only a key length of 128, 192 or 256 bits are supported with AES.
#endif
#elif defined(ENCRYPTION_3DES_LTC)
#if (ENCRYPTION_KEY_LENGTH != 16) && \
(ENCRYPTION_KEY_LENGTH != 24)
#error Only a key length of 128 or 192 bits are supported with Triple-DES.
#endif
#endif
// Supported block length
#if defined(ENCRYPTION_AES_LTC)
#if (ENCRYPTION_BLOCK_LENGTH != 16)
#error Only a block length of 128 bits is supported with AES.
#endif
#elif defined(ENCRYPTION_3DES_LTC)
#if (ENCRYPTION_BLOCK_LENGTH != 8)
#error Only a block length of 64 bits is supported with Triple-DES.
#endif
#endif
//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------
// Functions
#ifdef ONLY_ONE_ENCRYPTION
#define ENCRYPTION_INIT ltc_init
#define ENCRYPTION_CLEANUP ltc_cleanup
#define ENCRYPTION_DECRYPT ltc_decrypt
#if defined(ENCRYPTION_AES_LTC)
#define CIPHER_NAME "rijndael"
#define CIPHER_DESC rijndael_desc
#elif defined(ENCRYPTION_3DES_LTC)
#define CIPHER_NAME "3des"
#define CIPHER_DESC des3_desc
#endif
#endif
//------------------------------------------------------------------------------
// Prototypes
//------------------------------------------------------------------------------
#ifdef ONLY_ONE_ENCRYPTION
extern void ltc_init(void);
#endif
extern void ltc_init_AES_CBC(void);
extern void ltc_init_AES_CTR(void);
extern void ltc_init_AES_ECB(void);
extern void ltc_init_3DES_CBC(void);
extern void ltc_init_3DES_CTR(void);
extern void ltc_init_3DES_ECB(void);
extern void ltc_cleanup(void);
extern void ltc_cleanup_CBC(void);
extern void ltc_cleanup_CTR(void);
extern void ltc_cleanup_ECB(void);
extern int ltc_decrypt(const unsigned char * cipherText, unsigned char * plainText, unsigned int length);
extern int ltc_decrypt_CBC(const unsigned char * cipherText, unsigned char * plainText, unsigned int length);
extern int ltc_decrypt_CTR(const unsigned char * cipherText, unsigned char * plainText, unsigned int length);
extern int ltc_decrypt_ECB(const unsigned char * cipherText, unsigned char * plainText, unsigned int length);
#endif // defined(USE_ENCRYPTION) && (defined(ENCRYPTION_AES_LTC) || defined(ENCRYPTION_3DES_LTC))
#endif // BOOTLOADER_AES_LIBTOMCRYPT_H
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