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exp.c

/* unused */

#include <stdio.h>
#include <openssl/tmdiff.h>
#include "bn_lcl.h"

#define SIZE      256
#define NUM (8*8*8)
#define MOD (8*8*8*8*8)

main(argc,argv)
int argc;
char *argv[];
      {
      BN_CTX ctx;
      BIGNUM a,b,c,r,rr,t,l;
      int j,i,size=SIZE,num=NUM,mod=MOD;
      char *start,*end;
      BN_MONT_CTX mont;
      double d,md;

      BN_MONT_CTX_init(&mont);
      BN_CTX_init(&ctx);
      BN_init(&a);
      BN_init(&b);
      BN_init(&c);
      BN_init(&r);

      start=ms_time_new();
      end=ms_time_new();
      while (size <= 1024*8)
            {
            BN_rand(&a,size,0,0);
            BN_rand(&b,size,1,0);
            BN_rand(&c,size,0,1);

            BN_mod(&a,&a,&c,&ctx);

            ms_time_get(start);
            for (i=0; i<10; i++)
                  BN_MONT_CTX_set(&mont,&c,&ctx);
            ms_time_get(end);
            md=ms_time_diff(start,end);

            ms_time_get(start);
            for (i=0; i<num; i++)
                  {
                  /* bn_mull(&r,&a,&b,&ctx); */
                  /* BN_sqr(&r,&a,&ctx); */
                  BN_mod_exp_mont(&r,&a,&b,&c,&ctx,&mont);
                  }
            ms_time_get(end);
            d=ms_time_diff(start,end)/* *50/33 */;
            printf("%5d bit:%6.2f %6d %6.4f %4d m_set(%5.4f)\n",size,
                  d,num,d/num,(int)((d/num)*mod),md/10.0);
            num/=8;
            mod/=8;
            if (num <= 0) num=1;
            size*=2;
            }

      }

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