mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-09-19 19:50:18 +02:00
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "mpi.h"
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#include "mpprime.h"
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#include <sys/types.h>
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#include <time.h>
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#define MAX_PREC (4096 / MP_DIGIT_BIT)
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mp_err identity_test(void)
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{
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mp_size preca, precb;
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mp_err res;
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mp_int a, b;
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mp_int t1, t2, t3, t4, t5;
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preca = (rand() % MAX_PREC) + 1;
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precb = (rand() % MAX_PREC) + 1;
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MP_DIGITS(&a) = 0;
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MP_DIGITS(&b) = 0;
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MP_DIGITS(&t1) = 0;
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MP_DIGITS(&t2) = 0;
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MP_DIGITS(&t3) = 0;
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MP_DIGITS(&t4) = 0;
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MP_DIGITS(&t5) = 0;
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MP_CHECKOK( mp_init(&a) );
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MP_CHECKOK( mp_init(&b) );
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MP_CHECKOK( mp_init(&t1) );
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MP_CHECKOK( mp_init(&t2) );
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MP_CHECKOK( mp_init(&t3) );
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MP_CHECKOK( mp_init(&t4) );
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MP_CHECKOK( mp_init(&t5) );
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MP_CHECKOK( mpp_random_size(&a, preca) );
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MP_CHECKOK( mpp_random_size(&b, precb) );
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if (mp_cmp(&a, &b) < 0)
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mp_exch(&a, &b);
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MP_CHECKOK( mp_mod(&a, &b, &t1) ); /* t1 = a%b */
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MP_CHECKOK( mp_div(&a, &b, &t2, NULL) ); /* t2 = a/b */
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MP_CHECKOK( mp_mul(&b, &t2, &t3) ); /* t3 = (a/b)*b */
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MP_CHECKOK( mp_add(&t1, &t3, &t4) ); /* t4 = a%b + (a/b)*b */
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MP_CHECKOK( mp_sub(&t4, &a, &t5) ); /* t5 = a%b + (a/b)*b - a */
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if (mp_cmp_z(&t5) != 0) {
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res = MP_UNDEF;
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goto CLEANUP;
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}
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CLEANUP:
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mp_clear(&t5);
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mp_clear(&t4);
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mp_clear(&t3);
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mp_clear(&t2);
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mp_clear(&t1);
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mp_clear(&b);
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mp_clear(&a);
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return res;
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}
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int
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main(void)
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{
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unsigned int seed = (unsigned int)time(NULL);
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unsigned long count = 0;
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mp_err res;
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srand(seed);
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while (MP_OKAY == (res = identity_test())) {
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if ((++count % 100) == 0)
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fputc('.', stderr);
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}
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fprintf(stderr, "\ntest failed, err %d\n", res);
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return res;
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}
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