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/*
* mptest-4b.c
*
* Test speed of a large modular exponentiation of a primitive element
* modulo a prime.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <time.h>
#include <sys/time.h>
#include "mpi.h"
#include "mpprime.h"
char *g_prime =
"34BD53C07350E817CCD49721020F1754527959C421C1533244769D4CF060A8B1C3DA"
"25094BE723FB1E2369B55FEEBBE0FAC16425161BF82684062B5EC5D7D47D1B23C117"
"0FA19745E44A55E148314E582EB813AC9EE5126295E2E380CACC2F6D206B293E5ED9"
"23B54EE961A8C69CD625CE4EC38B70C649D7F014432AEF3A1C93";
char *g_gen = "5";
typedef struct {
unsigned int sec;
unsigned int usec;
} instant_t;
instant_t
now(void)
{
struct timeval clk;
instant_t res;
res.sec = res.usec = 0;
if (gettimeofday(&clk, NULL) != 0)
return res;
res.sec = clk.tv_sec;
res.usec = clk.tv_usec;
return res;
}
extern mp_err s_mp_pad();
int
main(int argc, char *argv[])
{
instant_t start, finish;
mp_int prime, gen, expt, res;
unsigned int ix, diff;
int num;
srand(time(NULL));
if (argc < 2) {
fprintf(stderr, "Usage: %s <num-tests>\n", argv[0]);
return 1;
}
if ((num = atoi(argv[1])) < 0)
num = -num;
if (num == 0)
++num;
mp_init(&prime);
mp_init(&gen);
mp_init(&res);
mp_read_radix(&prime, g_prime, 16);
mp_read_radix(&gen, g_gen, 16);
mp_init_size(&expt, USED(&prime) - 1);
s_mp_pad(&expt, USED(&prime) - 1);
printf("Testing %d modular exponentations ... \n", num);
start = now();
for (ix = 0; ix < num; ix++) {
mpp_random(&expt);
mp_exptmod(&gen, &expt, &prime, &res);
}
finish = now();
diff = (finish.sec - start.sec) * 1000000;
diff += finish.usec;
diff -= start.usec;
printf("%d operations took %u usec (%.3f sec)\n",
num, diff, (double)diff / 1000000.0);
printf("That is %.3f sec per operation.\n",
((double)diff / 1000000.0) / num);
mp_clear(&expt);
mp_clear(&res);
mp_clear(&gen);
mp_clear(&prime);
return 0;
}
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