1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/nss/lib/freebl/mpi/utils/metime.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,100 @@
1.4 +/*
1.5 + * metime.c
1.6 + *
1.7 + * Modular exponentiation timing test
1.8 + *
1.9 + * This Source Code Form is subject to the terms of the Mozilla Public
1.10 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.11 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.12 +
1.13 +#include <stdio.h>
1.14 +#include <stdlib.h>
1.15 +#include <string.h>
1.16 +#include <limits.h>
1.17 +#include <time.h>
1.18 +
1.19 +#include "mpi.h"
1.20 +#include "mpprime.h"
1.21 +
1.22 +double clk_to_sec(clock_t start, clock_t stop);
1.23 +
1.24 +int main(int argc, char *argv[])
1.25 +{
1.26 + int ix, num, prec = 8;
1.27 + unsigned int seed;
1.28 + clock_t start, stop;
1.29 + double sec;
1.30 +
1.31 + mp_int a, m, c;
1.32 +
1.33 + if(getenv("SEED") != NULL)
1.34 + seed = abs(atoi(getenv("SEED")));
1.35 + else
1.36 + seed = (unsigned int)time(NULL);
1.37 +
1.38 + if(argc < 2) {
1.39 + fprintf(stderr, "Usage: %s <num-tests> [<nbits>]\n", argv[0]);
1.40 + return 1;
1.41 + }
1.42 +
1.43 + if((num = atoi(argv[1])) < 0)
1.44 + num = -num;
1.45 +
1.46 + if(!num) {
1.47 + fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
1.48 + return 1;
1.49 + }
1.50 +
1.51 + if(argc > 2) {
1.52 + if((prec = atoi(argv[2])) <= 0)
1.53 + prec = 8;
1.54 + else
1.55 + prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
1.56 +
1.57 + }
1.58 +
1.59 + printf("Modular exponentiation timing test\n"
1.60 + "Precision: %d digits (%d bits)\n"
1.61 + "# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);
1.62 +
1.63 + mp_init_size(&a, prec);
1.64 + mp_init_size(&m, prec);
1.65 + mp_init_size(&c, prec);
1.66 +
1.67 + srand(seed);
1.68 +
1.69 + start = clock();
1.70 + for(ix = 0; ix < num; ix++) {
1.71 +
1.72 + mpp_random_size(&a, prec);
1.73 + mpp_random_size(&c, prec);
1.74 + mpp_random_size(&m, prec);
1.75 + /* set msb and lsb of m */
1.76 + DIGIT(&m,0) |= 1;
1.77 + DIGIT(&m, USED(&m)-1) |= (mp_digit)1 << (DIGIT_BIT - 1);
1.78 + if (mp_cmp(&a, &m) > 0)
1.79 + mp_sub(&a, &m, &a);
1.80 +
1.81 + mp_exptmod(&a, &c, &m, &c);
1.82 + }
1.83 + stop = clock();
1.84 +
1.85 + sec = clk_to_sec(start, stop);
1.86 +
1.87 + printf("Total: %.3f seconds\n", sec);
1.88 + printf("Individual: %.3f seconds\n", sec / num);
1.89 +
1.90 + mp_clear(&c);
1.91 + mp_clear(&a);
1.92 + mp_clear(&m);
1.93 +
1.94 + return 0;
1.95 +}
1.96 +
1.97 +double clk_to_sec(clock_t start, clock_t stop)
1.98 +{
1.99 + return (double)(stop - start) / CLOCKS_PER_SEC;
1.100 +}
1.101 +
1.102 +/*------------------------------------------------------------------------*/
1.103 +/* HERE THERE BE DRAGONS */
