mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-23 16:29:34 +00:00
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2008, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* $Id: cc2420-aes.c,v 1.5 2010/06/24 11:25:55 nifi Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* AES encryption functions.
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "contiki.h"
|
|
#include "dev/cc2420.h"
|
|
#include "dev/cc2420-aes.h"
|
|
#include "dev/spi.h"
|
|
|
|
#define KEYLEN 16
|
|
#define MAX_DATALEN 16
|
|
|
|
#define CC2420_WRITE_RAM_REV(buffer,adr,count) \
|
|
do { \
|
|
uint8_t i; \
|
|
CC2420_SPI_ENABLE(); \
|
|
SPI_WRITE_FAST(0x80 | (adr & 0x7f)); \
|
|
SPI_WRITE_FAST((adr >> 1) & 0xc0); \
|
|
for(i = (count); i > 0; i--) { \
|
|
SPI_WRITE_FAST(((uint8_t*)(buffer))[i - 1]); \
|
|
} \
|
|
SPI_WAITFORTx_ENDED(); \
|
|
CC2420_SPI_DISABLE(); \
|
|
} while(0)
|
|
|
|
#define MIN(a,b) ((a) < (b)? (a): (b))
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_aes_set_key(const uint8_t *key, int index)
|
|
{
|
|
switch(index) {
|
|
case 0:
|
|
CC2420_WRITE_RAM_REV(key, CC2420RAM_KEY0, KEYLEN);
|
|
break;
|
|
case 1:
|
|
CC2420_WRITE_RAM_REV(key, CC2420RAM_KEY1, KEYLEN);
|
|
break;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Encrypt at most 16 bytes of data. */
|
|
static void
|
|
cipher16(uint8_t *data, int len)
|
|
{
|
|
uint8_t status;
|
|
|
|
len = MIN(len, MAX_DATALEN);
|
|
|
|
CC2420_WRITE_RAM(data, CC2420RAM_SABUF, len);
|
|
CC2420_STROBE(CC2420_SAES);
|
|
/* Wait for the encryption to finish */
|
|
do {
|
|
CC2420_GET_STATUS(status);
|
|
} while(status & BV(CC2420_ENC_BUSY));
|
|
CC2420_READ_RAM(data, CC2420RAM_SABUF, len);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_aes_cipher(uint8_t *data, int len, int key_index)
|
|
{
|
|
int i;
|
|
uint16_t secctrl0;
|
|
|
|
CC2420_READ_REG(CC2420_SECCTRL0, secctrl0);
|
|
|
|
secctrl0 &= ~(CC2420_SECCTRL0_SAKEYSEL0 | CC2420_SECCTRL0_SAKEYSEL1);
|
|
|
|
switch(key_index) {
|
|
case 0:
|
|
secctrl0 |= CC2420_SECCTRL0_SAKEYSEL0;
|
|
break;
|
|
case 1:
|
|
secctrl0 |= CC2420_SECCTRL0_SAKEYSEL1;
|
|
break;
|
|
}
|
|
CC2420_WRITE_REG(CC2420_SECCTRL0, secctrl0);
|
|
|
|
for(i = 0; i < len; i = i + MAX_DATALEN) {
|
|
cipher16(data + i, MIN(len - i, MAX_DATALEN));
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|