121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/* Test mpz_powm_ui, mpz_mul. mpz_mod, mpz_mod_ui, mpz_div_ui.
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "urandom.h"
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void debug_mp ();
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#ifndef SIZE
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#define SIZE 8
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#endif
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main (argc, argv)
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int argc;
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char **argv;
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{
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mpz_t base, mod;
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mpz_t r1, r2, base2;
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mp_size_t base_size, mod_size;
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mp_limb_t exp, exp2;
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int i;
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int reps = 10000;
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if (argc == 2)
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reps = atoi (argv[1]);
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mpz_init (base);
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mpz_init (mod);
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mpz_init (r1);
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mpz_init (r2);
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mpz_init (base2);
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for (i = 0; i < reps; i++)
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{
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base_size = urandom () % SIZE /* - SIZE/2 */;
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mpz_random2 (base, base_size);
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mpn_random2 (&exp, 1);
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mod_size = urandom () % SIZE /* - SIZE/2 */;
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mpz_random2 (mod, mod_size);
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if (mpz_cmp_ui (mod, 0) == 0)
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continue;
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/* This is mathematically undefined. */
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if (mpz_cmp_ui (base, 0) == 0 && exp == 0)
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continue;
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#if 0
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putc ('\n', stderr);
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debug_mp (base, -16);
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debug_mp (mod, -16);
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#endif
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mpz_powm_ui (r1, base, (unsigned long int) exp, mod);
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mpz_set_ui (r2, 1);
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mpz_set (base2, base);
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exp2 = exp;
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mpz_mod (r2, r2, mod); /* needed when exp==0 and mod==1 */
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while (exp2 != 0)
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{
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if (exp2 % 2 != 0)
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{
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mpz_mul (r2, r2, base2);
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mpz_mod (r2, r2, mod);
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}
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mpz_mul (base2, base2, base2);
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mpz_mod (base2, base2, mod);
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exp2 = exp2 / 2;
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}
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#if 0
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debug_mp (r1, -16);
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debug_mp (r2, -16);
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#endif
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if (mpz_cmp (r1, r2) != 0)
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abort ();
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}
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exit (0);
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}
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dump_abort (dividend, divisor)
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MP_INT *dividend, *divisor;
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{
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fprintf (stderr, "ERROR\n");
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fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
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fprintf (stderr, "divisor = "); debug_mp (divisor, -16);
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abort();
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}
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void
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debug_mp (x, base)
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MP_INT *x;
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{
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mpz_out_str (stderr, base, x); fputc ('\n', stderr);
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}
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