From 044ad7c3987460ede48ff27afd6bdb0ca05a0432 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 4 Jul 2011 20:52:54 +0200 Subject: import at91lib from at91lib_20100901_softpack_1_9_v_1_0_svn_v15011 it's sad to see that atmel doesn't publish their svn repo or has a centralized location or even puts proper version/release info into the library itself --- utility/encryption/aes_reference.h | 132 +++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 utility/encryption/aes_reference.h (limited to 'utility/encryption/aes_reference.h') diff --git a/utility/encryption/aes_reference.h b/utility/encryption/aes_reference.h new file mode 100644 index 0000000..8de7b75 --- /dev/null +++ b/utility/encryption/aes_reference.h @@ -0,0 +1,132 @@ +/* ---------------------------------------------------------------------------- + * 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 reference implementation +/// +/// !Usage +/// +/// -# aes_ref_init: Initialize AES hardware +/// -# aes_ref_init_CBC: for the CBC mode +/// -# aes_ref_init_ECB: for the CTR mode +/// -# aes_ref_init_CTR: for the ECB mode +/// -# aes_ref_cleanup: Cleans up AES +/// -# aes_ref_decrypt: Decrypts a variable-length cipher text +/// -# aes_ref_decrypt_CBC: for CBC mode +/// -# aes_ref_decrypt_ECB: for ECB mode +/// -# aes_ref_decrypt_CTR: for CTR mode +//------------------------------------------------------------------------------ + +#ifndef BOOTLOADER_AES_REFERENCE_H +#define BOOTLOADER_AES_REFERENCE_H + +//------------------------------------------------------------------------------ +// Includes +//------------------------------------------------------------------------------ +#include "config.h" + + +#if defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_REF) + +//------------------------------------------------------------------------------ +// Check configuration +//------------------------------------------------------------------------------ + +// Supported modes +#if !defined(ENCRYPTION_ECB) && \ + !defined(ENCRYPTION_CBC) && \ + !defined(ENCRYPTION_CTR) + #error No other mode than ECB, CBC & CTR are supported. +#endif + +// Supported key length +#if (ENCRYPTION_KEY_LENGTH != 16) && \ + (ENCRYPTION_KEY_LENGTH != 24) && \ + (ENCRYPTION_KEY_LENGTH != 32) + #error Only key lengths of 128, 192 or 256 bits are supported. +#endif + +// Supported block length +#if (ENCRYPTION_BLOCK_LENGTH != 16) + #error Only block length of 128 bits is supported. +#endif + +//------------------------------------------------------------------------------ +// Definitions +//------------------------------------------------------------------------------ +#define BC (ENCRYPTION_BLOCK_LENGTH / 4) +#define SC ((BC - 4) >> 1) +#define KC (ENCRYPTION_KEY_LENGTH / 4) +#define t0f 0x000000FF & tf +#define t1f 0x0000FF00 & tf +#define t2f 0x00FF0000 & tf +#define t3f 0xFF000000 & tf + +#if (KC >= BC) + #define ROUNDS (KC + 6) +#else + #define ROUNDS (BC + 6) +#endif + +#ifdef ONLY_ONE_ENCRYPTION +#define ENCRYPTION_INIT aes_ref_init +#define ENCRYPTION_CLEANUP aes_ref_cleanup +#define ENCRYPTION_DECRYPT aes_ref_decrypt +#endif + +//------------------------------------------------------------------------------ +// Prototypes +//------------------------------------------------------------------------------ +extern void aes_ref_init(void); +extern void aes_ref_init_CBC(void); +extern void aes_ref_init_ECB(void); +extern void aes_ref_init_CTR(void); +extern void aes_ref_cleanup(void); +extern int aes_ref_decrypt(const unsigned char * cipherText, + unsigned char * plainText, + unsigned int length); +extern int aes_ref_decrypt_CBC(const unsigned char * cipherText, + unsigned char * plainText, + unsigned int length); +extern int aes_ref_decrypt_ECB(const unsigned char * cipherText, + unsigned char * plainText, + unsigned int length); +extern int aes_ref_decrypt_CTR(const unsigned char * cipherText, + unsigned char * plainText, + unsigned int length); + +#endif // defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_REF) + +#endif // BOOTLOADER_AES_REFERENCE_H + + -- cgit v1.2.3