randlc2s.c
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上传日期:2022-08-06
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- /* gmp_randinit_lc_2exp_size -- initialize a random state with a linear
- congruential generator of a requested size.
- Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser 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 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h> /* for NULL */
- #include "gmp.h"
- #include "gmp-impl.h"
- /* Array of LC-schemes, ordered in increasing order of the first
- member (the 'm2exp' value). The end of the array is indicated with
- an entry containing all zeros. */
- /* All multipliers are in the range 0.01*m and 0.99*m, and are
- congruent to 5 (mod 8).
- They all pass the spectral test with Vt >= 2^(30/t) and merit >= 1.
- (Up to and including 196 bits, merit is >= 3.) */
- struct __gmp_rand_lc_scheme_struct
- {
- unsigned long int m2exp; /* Modulus is 2 ^ m2exp. */
- const char *astr; /* Multiplier in string form. */
- unsigned long int c; /* Addend. */
- };
- static const struct __gmp_rand_lc_scheme_struct __gmp_rand_lc_scheme[] =
- {
- {32, "29CF535", 1},
- {33, "51F666D", 1},
- {34, "A3D73AD", 1},
- {35, "147E5B85", 1},
- {36, "28F725C5", 1},
- {37, "51EE3105", 1},
- {38, "A3DD5CDD", 1},
- {39, "147AF833D", 1},
- {40, "28F5DA175", 1},
- {56, "AA7D735234C0DD", 1},
- {64, "BAECD515DAF0B49D", 1},
- {100, "292787EBD3329AD7E7575E2FD", 1},
- {128, "48A74F367FA7B5C8ACBB36901308FA85", 1},
- {156, "78A7FDDDC43611B527C3F1D760F36E5D7FC7C45", 1},
- {196, "41BA2E104EE34C66B3520CE706A56498DE6D44721E5E24F5", 1},
- {200, "4E5A24C38B981EAFE84CD9D0BEC48E83911362C114F30072C5", 1},
- {256, "AF66BA932AAF58A071FD8F0742A99A0C76982D648509973DB802303128A14CB5", 1},
- {0, NULL, 0} /* End of array. */
- };
- int
- gmp_randinit_lc_2exp_size (gmp_randstate_t rstate, mp_bitcnt_t size)
- {
- const struct __gmp_rand_lc_scheme_struct *sp;
- mpz_t a;
- /* Pick a scheme. */
- for (sp = __gmp_rand_lc_scheme; sp->m2exp != 0; sp++)
- if (sp->m2exp / 2 >= size)
- goto found;
- return 0;
- found:
- /* Install scheme. */
- mpz_init_set_str (a, sp->astr, 16);
- gmp_randinit_lc_2exp (rstate, a, sp->c, sp->m2exp);
- mpz_clear (a);
- return 1;
- }