The Tor Browser: security/nss/lib/freebl/mpi/utils/identest.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include <stdio.h>

     6 #include <stdlib.h>

     7 #include "mpi.h"

     8 #include "mpprime.h"

     9 #include <sys/types.h>

    10 #include <time.h>

    12 #define MAX_PREC (4096 / MP_DIGIT_BIT)

    14 mp_err identity_test(void)

    15 {

    16   mp_size       preca, precb;

    17   mp_err        res;

    18   mp_int        a, b;

    19   mp_int        t1, t2, t3, t4, t5;

    21   preca = (rand() % MAX_PREC) + 1;

    22   precb = (rand() % MAX_PREC) + 1;

    24   MP_DIGITS(&a) = 0;

    25   MP_DIGITS(&b) = 0;

    26   MP_DIGITS(&t1) = 0;

    27   MP_DIGITS(&t2) = 0;

    28   MP_DIGITS(&t3) = 0;

    29   MP_DIGITS(&t4) = 0;

    30   MP_DIGITS(&t5) = 0;

    32   MP_CHECKOK( mp_init(&a)  );

    33   MP_CHECKOK( mp_init(&b)  );

    34   MP_CHECKOK( mp_init(&t1) );

    35   MP_CHECKOK( mp_init(&t2) );

    36   MP_CHECKOK( mp_init(&t3) );

    37   MP_CHECKOK( mp_init(&t4) );

    38   MP_CHECKOK( mp_init(&t5) );

    40   MP_CHECKOK( mpp_random_size(&a, preca) );

    41   MP_CHECKOK( mpp_random_size(&b, precb) );

    43   if (mp_cmp(&a, &b) < 0)

    44     mp_exch(&a, &b);

    46   MP_CHECKOK( mp_mod(&a, &b, &t1) );       /* t1 = a%b */

    47   MP_CHECKOK( mp_div(&a, &b, &t2, NULL) ); /* t2 = a/b */

    48   MP_CHECKOK( mp_mul(&b, &t2, &t3) );      /* t3 = (a/b)*b */

    49   MP_CHECKOK( mp_add(&t1, &t3, &t4) );     /* t4 = a%b + (a/b)*b */

    50   MP_CHECKOK( mp_sub(&t4, &a, &t5) );      /* t5 = a%b + (a/b)*b - a */

    51   if (mp_cmp_z(&t5) != 0) {

    52     res = MP_UNDEF;

    53     goto CLEANUP;

    54   }

    56 CLEANUP:

    57   mp_clear(&t5);

    58   mp_clear(&t4);

    59   mp_clear(&t3);

    60   mp_clear(&t2);

    61   mp_clear(&t1);

    62   mp_clear(&b);

    63   mp_clear(&a);

    64   return res;

    65 }

    67 int

    68 main(void)

    69 {

    70   unsigned int  seed = (unsigned int)time(NULL);

    71   unsigned long count = 0;

    72   mp_err        res;

    74   srand(seed);

    76   while (MP_OKAY == (res = identity_test())) {

    77      if ((++count % 100) == 0)

    78        fputc('.', stderr);

    79   }

    81   fprintf(stderr, "\ntest failed, err %d\n", res);

    82   return res;

    83 }

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