int main(int argc, char *argv[])
{
mp_digit num;
mp_int a, b;
srand(time(NULL));
if(argc < 3) {
fprintf(stderr, "Usage: %s <a> <b>\n", argv[0]);
return 1;
}
printf("Test 7: Random & divisibility tests\n\n");
mp_init(&a);
mp_init(&b);
mp_read_radix(&a, argv[1], 10);
mp_read_radix(&b, argv[2], 10);
printf("a = "); mp_print(&a, stdout); fputc('\n', stdout);
printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
if(mpp_divis(&a, &b) == MP_YES)
printf("a is divisible by b\n");
else
printf("a is not divisible by b\n");
if(mpp_divis(&b, &a) == MP_YES)
printf("b is divisible by a\n");
else
printf("b is not divisible by a\n");
printf("\nb = mpp_random()\n");
mpp_random(&b);
printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
mpp_random(&b);
printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
mpp_random(&b);
printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
printf("\nTesting a for divisibility by first 170 primes\n");
num = 170;
if(mpp_divis_primes(&a, &num) == MP_YES)
printf("It is divisible by at least one of them\n");
else
printf("It is not divisible by any of them\n");
mp_clear(&b);
mp_clear(&a);
return 0;
}
int main(int argc, char *argv[])
{
instant_t start, finish;
mp_int prime, gen, expt, res;
unsigned int ix, diff;
int num;
srand(time(NULL));
if(argc < 2) {
fprintf(stderr, "Usage: %s <num-tests>\n", argv[0]);
return 1;
}
if((num = atoi(argv[1])) < 0)
num = -num;
if(num == 0)
++num;
mp_init(&prime);
mp_init(&gen);
mp_init(&res);
mp_read_radix(&prime, g_prime, 16);
mp_read_radix(&gen, g_gen, 16);
mp_init_size(&expt, USED(&prime) - 1);
s_mp_pad(&expt, USED(&prime) - 1);
printf("Testing %d modular exponentations ... \n", num);
start = now();
for(ix = 0; ix < num; ix++) {
mpp_random(&expt);
mp_exptmod(&gen, &expt, &prime, &res);
}
finish = now();
diff = (finish.sec - start.sec) * 1000000;
diff += finish.usec;
diff -= start.usec;
printf("%d operations took %u usec (%.3f sec)\n",
num, diff, (double)diff / 1000000.0);
printf("That is %.3f sec per operation.\n",
((double)diff / 1000000.0) / num);
mp_clear(&expt);
mp_clear(&res);
mp_clear(&gen);
mp_clear(&prime);
return 0;
}
mp_err mpp_random_size(mp_int *a, mp_size prec)
{
mp_err res;
ARGCHK(a != NULL && prec > 0, MP_BADARG);
if((res = s_mp_pad(a, prec)) != MP_OKAY)
return res;
return mpp_random(a);
} /* end mpp_random_size() */
int main(int argc, char *argv[])
{
int ix, num, prec = 8;
unsigned int d;
instant_t start, finish;
time_t seed;
mp_int a, m, c;
seed = time(NULL);
if(argc < 2) {
fprintf(stderr, "Usage: %s <num-tests> [<precision>]\n", argv[0]);
return 1;
}
if((num = atoi(argv[1])) < 0)
num = -num;
if(!num) {
fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
return 1;
}
if(argc > 2) {
if((prec = atoi(argv[2])) <= 0)
prec = 8;
}
printf("Test 3a: Modular exponentiation timing test\n"
"Precision: %d digits (%d bits)\n"
"# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);
mp_init_size(&a, prec);
mp_init_size(&m, prec);
mp_init_size(&c, prec);
s_mp_pad(&a, prec);
s_mp_pad(&m, prec);
s_mp_pad(&c, prec);
printf("Testing modular exponentiation ... \n");
srand((unsigned int)seed);
start = now();
for(ix = 0; ix < num; ix++) {
mpp_random(&a);
mpp_random(&c);
mpp_random(&m);
mp_exptmod(&a, &c, &m, &c);
}
finish = now();
d = (finish.sec - start.sec) * 1000000;
d -= start.usec; d += finish.usec;
printf("Total time elapsed: %u usec\n", d);
printf("Time per exponentiation: %u usec (%.3f sec)\n",
(d / num), (double)(d / num) / 1000000);
mp_clear(&c);
mp_clear(&a);
mp_clear(&m);
return 0;
}
mp_err mpp_pprime(mp_int *a, int nt)
{
mp_err res;
mp_int x, amo, m, z; /* "amo" = "a minus one" */
int iter;
unsigned int jx;
mp_size b;
ARGCHK(a != NULL, MP_BADARG);
MP_DIGITS(&x) = 0;
MP_DIGITS(&amo) = 0;
MP_DIGITS(&m) = 0;
MP_DIGITS(&z) = 0;
/* Initialize temporaries... */
MP_CHECKOK( mp_init(&amo));
/* Compute amo = a - 1 for what follows... */
MP_CHECKOK( mp_sub_d(a, 1, &amo) );
b = mp_trailing_zeros(&amo);
if (!b) { /* a was even ? */
res = MP_NO;
goto CLEANUP;
}
MP_CHECKOK( mp_init_size(&x, MP_USED(a)) );
MP_CHECKOK( mp_init(&z) );
MP_CHECKOK( mp_init(&m) );
MP_CHECKOK( mp_div_2d(&amo, b, &m, 0) );
/* Do the test nt times... */
for(iter = 0; iter < nt; iter++) {
/* Choose a random value for x < a */
s_mp_pad(&x, USED(a));
mpp_random(&x);
MP_CHECKOK( mp_mod(&x, a, &x) );
/* Compute z = (x ** m) mod a */
MP_CHECKOK( mp_exptmod(&x, &m, a, &z) );
if(mp_cmp_d(&z, 1) == 0 || mp_cmp(&z, &amo) == 0) {
res = MP_YES;
continue;
}
res = MP_NO; /* just in case the following for loop never executes. */
for (jx = 1; jx < b; jx++) {
/* z = z^2 (mod a) */
MP_CHECKOK( mp_sqrmod(&z, a, &z) );
res = MP_NO; /* previous line set res to MP_YES */
if(mp_cmp_d(&z, 1) == 0) {
break;
}
if(mp_cmp(&z, &amo) == 0) {
res = MP_YES;
break;
}
} /* end testing loop */
/* If the test passes, we will continue iterating, but a failed
test means the candidate is definitely NOT prime, so we will
immediately break out of this loop
*/
if(res == MP_NO)
break;
} /* end iterations loop */
CLEANUP:
mp_clear(&m);
mp_clear(&z);
mp_clear(&x);
mp_clear(&amo);
return res;
} /* end mpp_pprime() */
