102 lines
4.1 KiB
C
102 lines
4.1 KiB
C
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2008, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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//------------------------------------------------------------------------------
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/// \unit
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///
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/// !Purpose
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///
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/// Firmware encryption using AES hardware acceleration
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/// This code is based on the AES reference implementation published by Paulo
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/// Barreto and Vincent Rijmen.
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///
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/// !Usage
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///
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/// -# aes_hard_init: Initialize AES hardware
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/// -# aes_hard_init_CBC: for the CBC mode
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/// -# aes_hard_init_CTR: for the CTR mode
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/// -# aes_hard_init_ECB: for the ECB mode
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/// -# aes_hard_cleanup: Cleans up AES
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/// -# aes_hard_decrypt: Decrypts a variable-length cipher text
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//------------------------------------------------------------------------------
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#ifndef BOOTLOADER_AES_HARDWARE_H
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#define BOOTLOADER_AES_HARDWARE_H
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//------------------------------------------------------------------------------
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// Includes
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//------------------------------------------------------------------------------
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#include "config.h"
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#if defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
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//------------------------------------------------------------------------------
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// Check configuration
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//------------------------------------------------------------------------------
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#if (ENCRYPTION_KEY_LENGTH != 16) && (ENCRYPTION_KEY_LENGTH != 24) \
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&& (ENCRYPTION_KEY_LENGTH != 32)
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#error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits keys.
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#endif
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#if (ENCRYPTION_BLOCK_LENGTH != 16)
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#error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits blocks.
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#endif
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#if !defined(ENCRYPTION_ECB) && \
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!defined(ENCRYPTION_CBC) && \
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!defined(ENCRYPTION_CTR)
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#error Only ECB, CBC & CTR modes are supported.
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#endif
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//------------------------------------------------------------------------------
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// Definitions
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//------------------------------------------------------------------------------
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#ifdef ONLY_ONE_ENCRYPTION
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#define ENCRYPTION_INIT aes_hard_init
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#define ENCRYPTION_CLEANUP aes_hard_cleanup
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#define ENCRYPTION_DECRYPT aes_hard_decrypt
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#endif
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//------------------------------------------------------------------------------
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// Exported functions
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//------------------------------------------------------------------------------
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extern void aes_hard_init(void);
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#ifndef ONLY_ONE_ENCRYPTION
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extern void aes_hard_init_CBC(void);
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extern void aes_hard_init_CTR(void);
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extern void aes_hard_init_ECB(void);
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#endif
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extern void aes_hard_cleanup(void);
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extern int aes_hard_decrypt(const unsigned char *, unsigned char *, unsigned int);
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#endif // defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
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#endif // BOOTLOADER_AES_HARDWARE_H
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