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/*
Copyright 2012, 2022, Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
The GNU MP Library test suite is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include "testutils.h"
#define MAXBITS 400
#define COUNT 1000
void
testmain (int argc, char **argv)
{
unsigned i;
mpz_t b, e, m, res, ref;
mpz_init (b);
mpz_init (e);
mpz_init (m);
mpz_init (res);
mpz_init (ref);
for (i = 0; i < COUNT; i++)
{
mini_random_op4 (OP_POWM, MAXBITS, b, e, m, ref);
mpz_powm (res, b, e, m);
if (mpz_cmp (res, ref))
{
fprintf (stderr, "mpz_powm failed:\n");
dump ("b", b);
dump ("e", e);
dump ("m", m);
dump ("r", res);
dump ("ref", ref);
abort ();
}
}
/* res >= 0, come from the random choices above, */
if (mpz_cmp_ui (res, 1) <= 0) /* if too small, */
mpz_add_ui (res, res, 9); /* add an arbitrary value. */
mpz_set_ui (e, 0);
/* Test the case m^0 (mod m), expect 1 (m is greater than 1). */
mpz_powm (res, res, e, res);
if (mpz_cmp_ui (res, 1) != 0)
{
fprintf (stderr, "mpz_powm failed: b=m, e=0; 1 expected,\n");
dump ("m", res);
dump ("r", res);
abort ();
}
/* Now res is 1. */
/* Test the case 1^0 (mod 1), expect 0. */
mpz_powm (res, res, e, res);
if (mpz_size (res))
{
fprintf (stderr, "mpz_powm failed: b=1, e=0, m=1; 0 expected,\n");
dump ("r", res);
abort ();
}
mpz_clear (b);
mpz_clear (e);
mpz_clear (m);
mpz_clear (res);
mpz_clear (ref);
}
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