Functions for interfacing the built-in AES functions of the CC2420 chip
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adamdunkels
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105
core/dev/cc2420-aes.c
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105
core/dev/cc2420-aes.c
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/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: cc2420-aes.c,v 1.1 2008/07/02 08:46:13 adamdunkels Exp $
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*/
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/**
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* \file
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* AES encryption/decryption functions.
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "dev/cc2420-aes.h"
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#include "dev/cc2420_const.h"
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#include "dev/spi.h"
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#define KEYLEN 16
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#define MAX_DATALEN 16
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#define MIN(a,b) ((a) < (b)? (a): (b))
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/*---------------------------------------------------------------------------*/
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void
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cc2420_aes_set_key(uint8_t *key, int index)
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{
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uint16_t f;
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switch(index) {
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case 0:
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FASTSPI_WRITE_RAM_LE(key, CC2420RAM_KEY0, KEYLEN, f);
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break;
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case 1:
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FASTSPI_WRITE_RAM_LE(key, CC2420RAM_KEY0, KEYLEN, f);
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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/* Encrypt at most 16 bytes of data. */
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static void
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cipher16(uint8_t *data, int len)
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{
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uint16_t f;
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len = MIN(len, MAX_DATALEN);
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FASTSPI_WRITE_RAM_LE(data, CC2420RAM_SABUF, len, f);
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FASTSPI_STROBE(CC2420_SAES);
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FASTSPI_READ_RAM_LE(data, CC2420RAM_SABUF, len, f);
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2420_aes_cihper(uint8_t *data, int len, int key_index)
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{
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int i;
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uint16_t secctrl0;
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FASTSPI_GETREG(CC2420_SECCTRL0, secctrl0);
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secctrl0 &= ~(CC2420_SECCTRL0_SAKEYSEL0 | CC2420_SECCTRL0_SAKEYSEL1);
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switch(key_index) {
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case 0:
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secctrl0 |= CC2420_SECCTRL0_SAKEYSEL0;
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break;
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case 1:
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secctrl0 |= CC2420_SECCTRL0_SAKEYSEL1;
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break;
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}
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FASTSPI_SETREG(CC2420_SECCTRL0, secctrl0);
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for(i = 0; i < len; i = i + MAX_DATALEN) {
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cipher16(data + i, MIN(len - i, MAX_DATALEN));
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}
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}
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/*---------------------------------------------------------------------------*/
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76
core/dev/cc2420-aes.h
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76
core/dev/cc2420-aes.h
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@ -0,0 +1,76 @@
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/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: cc2420-aes.h,v 1.1 2008/07/02 08:46:13 adamdunkels Exp $
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*/
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/**
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* \file
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* Interface to the CC2420 AES encryption/decryption functions
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef __CC2420_AES_H__
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#define __CC2420_AES_H__
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/**
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* \brief Setup an AES key
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* \param key A pointer to a 16-byte AES key
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* \param index The key index: either 0 or 1.
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*
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* This function sets up an AES key with the CC2420
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* chip. The AES key can later be used with the
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* cc2420_aes_cipher() function to encrypt or decrypt
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* data.
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*
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* The CC2420 can store two separate keys in its
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* memory. The keys are indexed as 0 or 1 and the key
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* index is given by the 'index' parameter.
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*
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*/
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void cc2420_aes_set_key(uint8_t *key, int index);
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/**
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* \brief Encrypt/decrypt data with AES
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* \param data A pointer to the data to be encrypted/decrypted
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* \param len The length of the data to be encrypted/decrypted
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* \param key_index The key to use. The key must have previously been set up with cc2420_aes_set_key().
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*
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* This function encrypts/decrypts data with AES. A
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* pointer to the data is passed as a parameter, and the
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* function overwrites the data with the encrypted data.
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*
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*/
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void cc2420_aes_cihper(uint8_t *data, int len, int key_index);
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#endif /* __CC2420_AES_H__ */
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