contiki/core/net/llsec/ccm-star-packetbuf.c
2015-10-14 08:22:44 -07:00

79 lines
3.2 KiB
C

/*
* Copyright (c) 2013, Hasso-Plattner-Institut.
* 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.
*
*/
/**
* \file
* CCM* convenience functions for LLSEC use
* \author
* Justin King-Lacroix <justin.kinglacroix@gmail.com>
* Konrad Krentz <konrad.krentz@gmail.com>
*/
#include "llsec/ccm-star-packetbuf.h"
#include "net/linkaddr.h"
#include "net/packetbuf.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
static const uint8_t *
get_extended_address(const linkaddr_t *addr)
#if LINKADDR_SIZE == 2
{
/* workaround for short addresses: derive EUI64 as in RFC 6282 */
static linkaddr_extended_t template = { { 0x00 , 0x00 , 0x00 ,
0xFF , 0xFE , 0x00 , 0x00 , 0x00 } };
template.u16[3] = LLSEC802154_HTONS(addr->u16);
return template.u8;
}
#else /* LINKADDR_SIZE == 2 */
{
return addr->u8;
}
#endif /* LINKADDR_SIZE == 2 */
/*---------------------------------------------------------------------------*/
void
ccm_star_packetbuf_set_nonce(uint8_t *nonce, int forward)
{
const linkaddr_t *source_addr;
source_addr = forward ? &linkaddr_node_addr : packetbuf_addr(PACKETBUF_ADDR_SENDER);
memcpy(nonce, get_extended_address(source_addr), 8);
nonce[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
nonce[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
nonce[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
nonce[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
nonce[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
}
/*---------------------------------------------------------------------------*/