michael@0: /* 
michael@0:  *  mptest4a - modular exponentiation speed test 
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <limits.h>
michael@0: #include <time.h>
michael@0: 
michael@0: #include <sys/time.h>
michael@0: 
michael@0: #include "mpi.h"
michael@0: #include "mpprime.h"
michael@0: 
michael@0: typedef struct {
michael@0:   unsigned int  sec;
michael@0:   unsigned int  usec;
michael@0: } instant_t;
michael@0: 
michael@0: instant_t now(void)
michael@0: {
michael@0:   struct timeval clk;
michael@0:   instant_t      res;
michael@0: 
michael@0:   res.sec = res.usec = 0;
michael@0: 
michael@0:   if(gettimeofday(&clk, NULL) != 0)
michael@0:     return res;
michael@0: 
michael@0:   res.sec = clk.tv_sec;
michael@0:   res.usec = clk.tv_usec;
michael@0: 
michael@0:   return res;
michael@0: }
michael@0: 
michael@0: extern mp_err s_mp_pad();
michael@0: 
michael@0: int main(int argc, char *argv[])
michael@0: {
michael@0:   int        ix, num, prec = 8;
michael@0:   unsigned   int d;
michael@0:   instant_t  start, finish;
michael@0:   time_t     seed;
michael@0:   mp_int     a, m, c;
michael@0: 
michael@0:   seed = time(NULL);
michael@0: 
michael@0:   if(argc < 2) {
michael@0:     fprintf(stderr, "Usage: %s <num-tests> [<precision>]\n", argv[0]);
michael@0:     return 1;
michael@0:   }
michael@0: 
michael@0:   if((num = atoi(argv[1])) < 0)
michael@0:     num = -num;
michael@0: 
michael@0:   if(!num) {
michael@0:     fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
michael@0:     return 1;
michael@0:   }
michael@0: 
michael@0:   if(argc > 2) {
michael@0:     if((prec = atoi(argv[2])) <= 0)
michael@0:       prec = 8;
michael@0:   }
michael@0:   
michael@0:   printf("Test 3a: Modular exponentiation timing test\n"
michael@0: 	 "Precision:  %d digits (%d bits)\n"
michael@0: 	 "# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);
michael@0: 
michael@0:   mp_init_size(&a, prec);
michael@0:   mp_init_size(&m, prec);
michael@0:   mp_init_size(&c, prec);
michael@0:   s_mp_pad(&a, prec);
michael@0:   s_mp_pad(&m, prec);
michael@0:   s_mp_pad(&c, prec);
michael@0: 
michael@0:   printf("Testing modular exponentiation ... \n");
michael@0:   srand((unsigned int)seed);
michael@0: 
michael@0:   start = now();
michael@0:   for(ix = 0; ix < num; ix++) {
michael@0:     mpp_random(&a);
michael@0:     mpp_random(&c);
michael@0:     mpp_random(&m);
michael@0:     mp_exptmod(&a, &c, &m, &c);
michael@0:   }
michael@0:   finish = now();
michael@0: 
michael@0:   d = (finish.sec - start.sec) * 1000000;
michael@0:   d -= start.usec; d += finish.usec;
michael@0: 
michael@0:   printf("Total time elapsed:        %u usec\n", d);
michael@0:   printf("Time per exponentiation:   %u usec (%.3f sec)\n", 
michael@0: 	 (d / num), (double)(d / num) / 1000000);
michael@0: 
michael@0:   mp_clear(&c);
michael@0:   mp_clear(&a);
michael@0:   mp_clear(&m);
michael@0: 
michael@0:   return 0;
michael@0: }