118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* Test mpz_invert.
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Copyright 1991, 1993, 1994, 1996, 1997, 2000-2005, 2008, 2009, 2012, 2014 Free
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Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp-impl.h"
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#include "tests.h"
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int
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main (int argc, char **argv)
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{
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mpz_t a, m, ainv, t;
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int test, r;
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gmp_randstate_ptr rands;
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mpz_t bs;
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unsigned long bsi, size_range;
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int reps = 1000;
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tests_start ();
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TESTS_REPS (reps, argv, argc);
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rands = RANDS;
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mpz_init (bs);
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mpz_init (a);
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mpz_init (m);
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mpz_init (ainv);
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mpz_init (t);
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for (test = 0; test < reps; test++)
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{
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mpz_urandomb (bs, rands, 32);
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size_range = mpz_get_ui (bs) % 16 + 2;
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mpz_urandomb (bs, rands, size_range);
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mpz_rrandomb (a, rands, mpz_get_ui (bs));
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do {
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mpz_urandomb (bs, rands, size_range);
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mpz_rrandomb (m, rands, mpz_get_ui (bs));
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} while (mpz_sgn (m) == 0);
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mpz_urandomb (bs, rands, 8);
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bsi = mpz_get_ui (bs);
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if ((bsi & 1) != 0)
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mpz_neg (a, a);
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if ((bsi & 2) != 0)
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mpz_neg (m, m);
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r = mpz_invert (ainv, a, m);
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if (r != 0)
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{
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MPZ_CHECK_FORMAT (ainv);
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if (mpz_cmp_ui (ainv, 0) < 0 || mpz_cmpabs (ainv, m) >= 0)
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{
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fprintf (stderr, "ERROR in test %d\n", test);
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gmp_fprintf (stderr, "Inverse out of range.\n");
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gmp_fprintf (stderr, "a = %Zx\n", a);
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gmp_fprintf (stderr, "1/a = %Zx\n", ainv);
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gmp_fprintf (stderr, "m = %Zx\n", m);
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abort ();
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}
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mpz_mul (t, ainv, a);
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mpz_mod (t, t, m);
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if (mpz_cmp_ui (t, mpz_cmpabs_ui (m, 1) != 0) != 0)
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{
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fprintf (stderr, "ERROR in test %d\n", test);
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gmp_fprintf (stderr, "a^(-1)*a != 1 (mod m)\n");
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gmp_fprintf (stderr, "a = %Zx\n", a);
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gmp_fprintf (stderr, "m = %Zx\n", m);
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abort ();
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}
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}
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else /* Inverse deos not exist */
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{
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mpz_gcd (t, a, m);
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if (mpz_cmp_ui (t, 1) == 0)
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{
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fprintf (stderr, "ERROR in test %d\n", test);
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gmp_fprintf (stderr, "Inverse exists, but was not found.\n");
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gmp_fprintf (stderr, "a = %Zx\n", a);
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gmp_fprintf (stderr, "m = %Zx\n", m);
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abort ();
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}
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}
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}
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mpz_clear (bs);
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mpz_clear (a);
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mpz_clear (m);
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mpz_clear (ainv);
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mpz_clear (t);
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tests_end ();
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exit (0);
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}
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