source-engine/thirdparty/openssl/crypto/bn/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;
    }

}