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117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
/*
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* Copyright (c) 2013, Hasso-Plattner-Institut.
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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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*/
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/**
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* \file
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* CCM* convenience functions for LLSEC use
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* \author
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* Justin King-Lacroix <justin.kinglacroix@gmail.com>
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* Konrad Krentz <konrad.krentz@gmail.com>
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*/
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#include "llsec/ccm-star-packetbuf.h"
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#include "lib/ccm-star.h"
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#include "net/packetbuf.h"
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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static const uint8_t *
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get_extended_address(const linkaddr_t *addr)
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#if LINKADDR_SIZE == 2
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{
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/* workaround for short addresses: derive EUI64 as in RFC 6282 */
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static linkaddr_extended_t template = { { 0x00 , 0x00 , 0x00 ,
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0xFF , 0xFE , 0x00 , 0x00 , 0x00 } };
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template.u16[3] = LLSEC802154_HTONS(addr->u16);
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return template.u8;
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}
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#else /* LINKADDR_SIZE == 2 */
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{
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return addr->u8;
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}
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#endif /* LINKADDR_SIZE == 2 */
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/*---------------------------------------------------------------------------*/
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/* Inits the 13-byte CCM* nonce as of 802.15.4-2011. */
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static void
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set_nonce(uint8_t *nonce, const linkaddr_t *source_addr)
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{
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memcpy(nonce, get_extended_address(source_addr), 8);
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nonce[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
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nonce[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
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nonce[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
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nonce[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
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nonce[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
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}
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/*---------------------------------------------------------------------------*/
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void
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ccm_star_packetbuf_mic(const linkaddr_t *source_addr,
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uint8_t *result,
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uint8_t mic_len)
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{
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uint8_t nonce[CCM_STAR_NONCE_LENGTH];
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uint8_t *m;
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uint8_t m_len;
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uint8_t *a;
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uint8_t a_len;
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set_nonce(nonce, source_addr);
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a = packetbuf_hdrptr();
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if(packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL) & (1 << 2)) {
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m = packetbuf_dataptr();
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m_len = packetbuf_datalen();
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a_len = packetbuf_hdrlen();
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} else {
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m = NULL;
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m_len = 0;
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a_len = packetbuf_totlen();
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}
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CCM_STAR.mic(nonce,
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m, m_len,
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a, a_len,
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result,
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mic_len);
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}
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/*---------------------------------------------------------------------------*/
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void
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ccm_star_packetbuf_ctr(const linkaddr_t *source_addr)
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{
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uint8_t nonce[CCM_STAR_NONCE_LENGTH];
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set_nonce(nonce, source_addr);
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CCM_STAR.ctr(nonce, packetbuf_dataptr(), packetbuf_datalen());
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}
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/*---------------------------------------------------------------------------*/
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