random.c
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上传日期:2022-08-06
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- /* mpn_random -- Generate random numbers.
- Copyright 2001, 2002 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 "gmp.h"
- #include "gmp-impl.h"
- void
- mpn_random (mp_ptr ptr, mp_size_t size)
- {
- gmp_randstate_ptr rands;
- /* FIXME: Is size==0 supposed to be allowed? */
- ASSERT (size >= 0);
- if (size == 0)
- return;
- rands = RANDS;
- _gmp_rand (ptr, rands, size * GMP_NUMB_BITS);
- /* Make sure the most significant limb is non-zero. */
- while (ptr[size-1] == 0)
- _gmp_rand (&ptr[size-1], rands, GMP_NUMB_BITS);
- }