diff options
Diffstat (limited to 'vendor/gmp-6.3.0/tests/mpz/t-lucm.c')
-rw-r--r-- | vendor/gmp-6.3.0/tests/mpz/t-lucm.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/tests/mpz/t-lucm.c b/vendor/gmp-6.3.0/tests/mpz/t-lucm.c new file mode 100644 index 0000000..24be85b --- /dev/null +++ b/vendor/gmp-6.3.0/tests/mpz/t-lucm.c @@ -0,0 +1,144 @@ +/* Test mpz_powm, mpz_lucas_mod. + +Copyright 1991, 1993, 1994, 1996, 1999-2001, 2009, 2012, 2018 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 <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "gmp-impl.h" +#include "tests.h" + +void debug_mp (mpz_t, int); + +#define SIZEM 8 + +/* FIXME: Should we implement another sequence to test lucas mod? */ +/* Eg: a generalisation of what we use for Fibonacci: */ +/* U_{2n-1} = U_n^2 - Q*U_{n-1}^2 */ +/* U_{2n+1} = D*U_n^2 + Q*U_{2n-1} + 2*Q^n ; whith D = (P^2-4*Q) */ +/* P*U_{2n} = U_{2n+1} + Q*U_{2n-1} */ + +int +main (int argc, char **argv) +{ + mpz_t base, exp, mod; + mpz_t r1, r2, t1, t2; + mp_size_t exp_size, mod_size; + int i, res; + int reps = 1000; + long Q; + gmp_randstate_ptr rands; + mpz_t bs; + unsigned long bsi, size_range; + + tests_start (); + TESTS_REPS (reps, argv, argc); + + rands = RANDS; + + mpz_init (bs); + + mpz_init (base); + mpz_init (exp); + mpz_init (mod); + mpz_init (r1); + mpz_init (r2); + mpz_init (t1); + mpz_init (t2); + + for (i = 0; i < reps; i++) + { + mpz_urandomb (bs, rands, 32); + size_range = mpz_get_ui (bs) % SIZEM + 1; + + do /* Loop until base >= 2 and fits in a long. */ + { + mpz_urandomb (base, rands, BITS_PER_ULONG - 2); + } + while (mpz_cmp_ui (base, 2) < 0 || mpz_fits_slong_p (base) == 0); + + Q = mpz_get_ui (base); + + do + { + ++size_range; + size_range = MIN (size_range, SIZEM); + mpz_urandomb (bs, rands, size_range); + mod_size = mpz_get_ui (bs); + mpz_rrandomb (mod, rands, mod_size); + mpz_add_ui (mod, mod, 16); + } + while (mpz_gcd_ui (NULL, mod, Q) != 1); + + mod_size = mpz_sizeinbase (mod, 2) - 3; + mpz_urandomb (bs, rands, 32); + exp_size = mpz_get_ui (bs) % mod_size + 2; + + mpz_tdiv_q_2exp (exp, mod, exp_size); + mpz_add_ui (exp, exp, 1); + + mpz_urandomb (bs, rands, 2); + bsi = mpz_get_ui (bs); + if ((bsi & 1) != 0) + { + mpz_neg (base, base); + Q = -Q; + } + + res = mpz_lucas_mod (t1, r2, Q, exp_size, mod, t2, r1); + if (res && ++reps) + continue; + MPZ_CHECK_FORMAT (r2); + if (mpz_cmp_ui (r2, 0) < 0) + mpz_add (r2, r2, mod); + mpz_powm (r1, base, exp, mod); + + if (mpz_cmp (r1, r2) != 0) + { + fprintf (stderr, "\nIncorrect results in test %d for operands:\n", i); + debug_mp (base, -16); + debug_mp (exp, -16); + debug_mp (mod, -16); + fprintf (stderr, "mpz_powm result:\n"); + debug_mp (r1, -16); + fprintf (stderr, "mpz_lucas_mod result (%d) Q=%ld:\n", res, Q); + debug_mp (r2, -16); + abort (); + } + } + + mpz_clear (bs); + mpz_clear (base); + mpz_clear (exp); + mpz_clear (mod); + mpz_clear (r1); + mpz_clear (r2); + mpz_clear (t1); + mpz_clear (t2); + + tests_end (); + exit (0); +} + +void +debug_mp (mpz_t x, int base) +{ + mpz_out_str (stderr, base, x); fputc ('\n', stderr); +} |