lib/rand-isaac.h

   1 /* Bob Jenkins's cryptographic random number generator, ISAAC.
   2
   3    Copyright (C) 1999-2005 Free Software Foundation, Inc.
   4    Copyright (C) 1997, 1998, 1999 Colin Plumb.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19
  20    Written by Colin Plumb.  */
  21
  22 #ifndef RAND_ISAAC_H
  23 # define RAND_ISAAC_H
  24
  25 # include <stdint.h>
  26
  27 /* Size of the state tables to use.  ISAAC_LOG should be at least 3,
  28    and smaller values give less security.  */
  29 # define ISAAC_LOG 8
  30 # define ISAAC_WORDS (1 << ISAAC_LOG)
  31 # define ISAAC_BYTES (ISAAC_WORDS * sizeof (uint32_t))
  32
  33 /* RNG state variables.  The members of this structure are private.  */
  34 struct isaac_state
  35   {
  36     uint32_t mm[ISAAC_WORDS];   /* Main state array */
  37     uint32_t iv[8];             /* Seeding initial vector */
  38     uint32_t a, b, c;           /* Extra index variables */
  39   };
  40
  41 void isaac_seed (struct isaac_state *);
  42 void isaac_refill (struct isaac_state *, uint32_t[ISAAC_WORDS]);
  43
  44 #endif