lib/util/genrand.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Functions to create reasonable random numbers for crypto use.
   5
   6    Copyright (C) Jeremy Allison 2001
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /**
  23  Copy any user given reseed data.
  24 **/
  25
  26 void set_rand_reseed_callback(void (*fn)(void *, int *), void *userdata);
  27
  28 /**
  29  * Tell the random number generator it needs to reseed.
  30  */
  31 void set_need_random_reseed(void);
  32
  33 /**
  34  Interface to the (hopefully) good crypto random number generator.
  35  Will use our internal PRNG if more than 40 bytes of random generation
  36  has been requested, otherwise tries to read from /dev/random
  37 **/
  38 void generate_random_buffer(uint8_t *out, int len);
  39
  40 /**
  41  Interface to the (hopefully) good crypto random number generator.
  42  Will always use /dev/urandom if available.
  43 **/
  44 void generate_secret_buffer(uint8_t *out, int len);