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/*
* mptest4a - modular exponentiation speed test
*
* 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"
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[])
{
int ix, num, prec = 8;
unsigned int d;
instant_t start, finish;
time_t seed;
mp_int a, m, c;
seed = time(NULL);
if (argc < 2) {
fprintf(stderr, "Usage: %s <num-tests> [<precision>]\n", argv[0]);
return 1;
}
if ((num = atoi(argv[1])) < 0)
num = -num;
if (!num) {
fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
return 1;
}
if (argc > 2) {
if ((prec = atoi(argv[2])) <= 0)
prec = 8;
}
printf("Test 3a: Modular exponentiation timing test\n"
"Precision: %d digits (%d bits)\n"
"# of tests: %d\n\n",
prec, prec * DIGIT_BIT, num);
mp_init_size(&a, prec);
mp_init_size(&m, prec);
mp_init_size(&c, prec);
s_mp_pad(&a, prec);
s_mp_pad(&m, prec);
s_mp_pad(&c, prec);
printf("Testing modular exponentiation ... \n");
srand((unsigned int)seed);
start = now();
for (ix = 0; ix < num; ix++) {
mpp_random(&a);
mpp_random(&c);
mpp_random(&m);
mp_exptmod(&a, &c, &m, &c);
}
finish = now();
d = (finish.sec - start.sec) * 1000000;
d -= start.usec;
d += finish.usec;
printf("Total time elapsed: %u usec\n", d);
printf("Time per exponentiation: %u usec (%.3f sec)\n",
(d / num), (double)(d / num) / 1000000);
mp_clear(&c);
mp_clear(&a);
mp_clear(&m);
return 0;
}
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