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101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
/*
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* metime.c
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*
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* Modular exponentiation timing test
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <time.h>
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#include "mpi.h"
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#include "mpprime.h"
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double clk_to_sec(clock_t start, clock_t stop);
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int main(int argc, char *argv[])
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{
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int ix, num, prec = 8;
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unsigned int seed;
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clock_t start, stop;
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double sec;
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mp_int a, m, c;
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if(getenv("SEED") != NULL)
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seed = abs(atoi(getenv("SEED")));
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else
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seed = (unsigned int)time(NULL);
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if(argc < 2) {
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fprintf(stderr, "Usage: %s <num-tests> [<nbits>]\n", argv[0]);
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return 1;
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}
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if((num = atoi(argv[1])) < 0)
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num = -num;
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if(!num) {
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fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
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return 1;
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}
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if(argc > 2) {
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if((prec = atoi(argv[2])) <= 0)
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prec = 8;
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else
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prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
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}
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printf("Modular exponentiation timing test\n"
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"Precision: %d digits (%d bits)\n"
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"# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);
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mp_init_size(&a, prec);
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mp_init_size(&m, prec);
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mp_init_size(&c, prec);
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srand(seed);
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start = clock();
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for(ix = 0; ix < num; ix++) {
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mpp_random_size(&a, prec);
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mpp_random_size(&c, prec);
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mpp_random_size(&m, prec);
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/* set msb and lsb of m */
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DIGIT(&m,0) |= 1;
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DIGIT(&m, USED(&m)-1) |= (mp_digit)1 << (DIGIT_BIT - 1);
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if (mp_cmp(&a, &m) > 0)
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mp_sub(&a, &m, &a);
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mp_exptmod(&a, &c, &m, &c);
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}
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stop = clock();
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sec = clk_to_sec(start, stop);
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printf("Total: %.3f seconds\n", sec);
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printf("Individual: %.3f seconds\n", sec / num);
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mp_clear(&c);
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mp_clear(&a);
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mp_clear(&m);
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return 0;
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}
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double clk_to_sec(clock_t start, clock_t stop)
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{
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return (double)(stop - start) / CLOCKS_PER_SEC;
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}
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/*------------------------------------------------------------------------*/
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/* HERE THERE BE DRAGONS */
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