osd-contiki/examples/cc2538-common/pka/ecc-ecdh.c

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/*
* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich.
* All rights reserved.
*
* Author: Andreas Dröscher <contiki@anticat.ch>
*
* 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.
*/
/**
* \addtogroup cc2538-examples
* @{
*
* \defgroup cc2538-ecdh-test cc2538 ECDH Test Project
*
* ECDH example for CC2538-based platforms
*
* This example shows how ECDH should be used. The example also verifies
* the ECDH functionality.
*
* @{
*
* \file
* Example demonstrating ECDH
*/
#include "contiki.h"
#include "dev/ecc-algorithm.h"
#include "dev/ecc-curve.h"
#include "lib/random.h"
#include "sys/rtimer.h"
#include "sys/pt.h"
#include <string.h>
#include <stdio.h>
static void
ecc_set_random(uint32_t *secret)
{
int i;
for(i = 0; i < 8; ++i) {
secret[i] = (uint32_t)random_rand() | (uint32_t)random_rand() << 16;
}
}
PROCESS(ecdh_test, "ecdh test");
AUTOSTART_PROCESSES(&ecdh_test);
PROCESS_THREAD(ecdh_test, ev, data) {
PROCESS_BEGIN();
/*
* Variable for Time Measurement
*/
static rtimer_clock_t time;
/*
* Activate Engine
*/
puts("-----------------------------------------\n"
"Initializing pka...");
pka_init();
/*
* Generate secrets make sure they are valid (smaller as order)
*/
static ecc_compare_state_t state = {
.process = &ecdh_test,
.size = 8,
};
memcpy(state.b, nist_p_256.n, sizeof(uint32_t) * 8);
static uint32_t secret_a[8];
do {
ecc_set_random(secret_a);
memcpy(state.a, secret_a, sizeof(uint32_t) * 8);
PT_SPAWN(&(ecdh_test.pt), &(state.pt), ecc_compare(&state));
} while(state.result != PKA_STATUS_A_LT_B);
static uint32_t secret_b[8];
ecc_set_random(secret_b);
do {
ecc_set_random(secret_b);
memcpy(state.a, secret_b, sizeof(uint32_t) * 8);
PT_SPAWN(&(ecdh_test.pt), &(state.pt), ecc_compare(&state));
} while(state.result != PKA_STATUS_A_LT_B);
/*
* Prepare Points
*/
static ecc_multiply_state_t side_a = {
.process = &ecdh_test,
.curve_info = &nist_p_256,
};
memcpy(side_a.point_in.x, nist_p_256.x, sizeof(uint32_t) * 8);
memcpy(side_a.point_in.y, nist_p_256.y, sizeof(uint32_t) * 8);
memcpy(side_a.secret, secret_a, sizeof(secret_a));
static ecc_multiply_state_t side_b = {
.process = &ecdh_test,
.curve_info = &nist_p_256,
};
memcpy(side_b.point_in.x, nist_p_256.x, sizeof(uint32_t) * 8);
memcpy(side_b.point_in.y, nist_p_256.y, sizeof(uint32_t) * 8);
memcpy(side_b.secret, secret_b, sizeof(secret_b));
/*
* Round 1
*/
time = RTIMER_NOW();
PT_SPAWN(&(ecdh_test.pt), &(side_a.pt), ecc_multiply(&side_a));
time = RTIMER_NOW() - time;
printf("Round 1, Side a: %i, %lu ms\n", (unsigned)side_a.result,
(uint32_t)((uint64_t)time * 1000 / RTIMER_SECOND));
time = RTIMER_NOW();
PT_SPAWN(&(ecdh_test.pt), &(side_b.pt), ecc_multiply(&side_b));
time = RTIMER_NOW() - time;
printf("Round 1, Side b: %i, %lu ms\n", (unsigned)side_b.result,
(uint32_t)((uint64_t)time * 1000 / RTIMER_SECOND));
/*
* Key Exchange
*/
memcpy(side_a.point_in.x, side_b.point_out.x, sizeof(uint32_t) * 8);
memcpy(side_a.point_in.y, side_b.point_out.y, sizeof(uint32_t) * 8);
memcpy(side_b.point_in.x, side_a.point_out.x, sizeof(uint32_t) * 8);
memcpy(side_b.point_in.y, side_a.point_out.y, sizeof(uint32_t) * 8);
/*
* Round 2
*/
time = RTIMER_NOW();
PT_SPAWN(&(ecdh_test.pt), &(side_a.pt), ecc_multiply(&side_a));
time = RTIMER_NOW() - time;
printf("Round 2, Side a: %i, %lu ms\n", (unsigned)side_a.result,
(uint32_t)((uint64_t)time * 1000 / RTIMER_SECOND));
time = RTIMER_NOW();
PT_SPAWN(&(ecdh_test.pt), &(side_b.pt), ecc_multiply(&side_b));
time = RTIMER_NOW() - time;
printf("Round 2, Side b: %i, %lu ms\n", (unsigned)side_b.result,
(uint32_t)((uint64_t)time * 1000 / RTIMER_SECOND));
/*
* Check Result
*/
memcpy(state.a, side_a.point_out.x, sizeof(uint32_t) * 8);
memcpy(state.b, side_b.point_out.x, sizeof(uint32_t) * 8);
PT_SPAWN(&(ecdh_test.pt), &(state.pt), ecc_compare(&state));
if(state.result) {
puts("shared secrets do not match");
} else {
puts("shared secrets MATCH");
}
puts("-----------------------------------------\n"
"Disabling pka...");
pka_disable();
puts("Done!");
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
*/