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/*
* metime.c
*
* Modular exponentiation timing 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 "mpi.h"
#include "mpprime.h"
double clk_to_sec(clock_t start, clock_t stop);
int main(int argc, char *argv[])
{
int ix, num, prec = 8;
unsigned int seed;
clock_t start, stop;
double sec;
mp_int a, m, c;
if(getenv("SEED") != NULL)
seed = abs(atoi(getenv("SEED")));
else
seed = (unsigned int)time(NULL);
if(argc < 2) {
fprintf(stderr, "Usage: %s <num-tests> [<nbits>]\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;
else
prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
}
printf("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);
srand(seed);
start = clock();
for(ix = 0; ix < num; ix++) {
mpp_random_size(&a, prec);
mpp_random_size(&c, prec);
mpp_random_size(&m, prec);
/* set msb and lsb of m */
DIGIT(&m,0) |= 1;
DIGIT(&m, USED(&m)-1) |= (mp_digit)1 << (DIGIT_BIT - 1);
if (mp_cmp(&a, &m) > 0)
mp_sub(&a, &m, &a);
mp_exptmod(&a, &c, &m, &c);
}
stop = clock();
sec = clk_to_sec(start, stop);
printf("Total: %.3f seconds\n", sec);
printf("Individual: %.3f seconds\n", sec / num);
mp_clear(&c);
mp_clear(&a);
mp_clear(&m);
return 0;
}
double clk_to_sec(clock_t start, clock_t stop)
{
return (double)(stop - start) / CLOCKS_PER_SEC;
}
/*------------------------------------------------------------------------*/
/* HERE THERE BE DRAGONS */
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