mdw@git.distorted.org.uk Git - become/blob - src/rand.h

   1 /* -*-c-*-
   2  *
   3  * $Id: rand.h,v 1.1 1997/08/07 09:46:05 mdw Exp $
   4  *
   5  * Random number generation
   6  *
   7  * (c) 1997 EBI
   8  */
   9
  10 /*----- Licencing notice --------------------------------------------------*
  11  *
  12  * This file is part of Become.
  13  *
  14  * Become is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * Become is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Become; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: rand.h,v $
  32  * Revision 1.1  1997/08/07 09:46:05  mdw
  33  * New source file added to maintain a randomness pool.
  34  *
  35  */
  36
  37 #ifndef RAND_H
  38 #define RAND_H
  39
  40 #ifdef __cplusplus
  41   extern "C" {
  42 #endif
  43
  44 /*----- Required headers --------------------------------------------------*/
  45
  46 #include <stdio.h>
  47
  48 #ifndef ICRYPT_H
  49 #  include "icrypt.h"
  50 #endif
  51
  52 /*----- Functions provided ------------------------------------------------*/
  53
  54 /* --- @rand_read@ --- *
  55  *
  56  * Arguments:   @FILE *fp@ = pointer to file to read from
  57  *
  58  * Returns:     ---
  59  *
  60  * Use:         Reads a random number seed from the stream.
  61  */
  62
  63 extern void rand_read(FILE */*fp*/);
  64
  65 /* --- @rand_write@ --- *
  66  *
  67  * Arguments:   @FILE *fp@ = pointer to file to write on
  68  *
  69  * Returns:     ---
  70  *
  71  * Use:         Writes a random number seed back to the stream.
  72  */
  73
  74 extern void rand_write(FILE */*fp*/);
  75
  76 /* --- @rand_clear@ --- *
  77  *
  78  * Arguments:   ---
  79  *
  80  * Returns:     ---
  81  *
  82  * Use:         Clears the random number pool.
  83  */
  84
  85 extern void rand_clear(void);
  86
  87 /* --- @rand_encrypt@ --- *
  88  *
  89  * Arguments:   @icrypt_job *j@ = pointer to an encryption job to apply
  90  *
  91  * Returns:     ---
  92  *
  93  * Use:         Encrypts the randomness pool with a given key.  This should
  94  *              be done before use, in case the pool gets compromised.
  95  */
  96
  97 extern void rand_encrypt(icrypt_job */*j*/);
  98
  99 /* --- @rand_add@ --- *
 100  *
 101  * Arguments:   @const void *p@ = pointer to some data
 102  *              @size_t sz@ = size of the data in bytes
 103  *
 104  * Returns:     ---
 105  *
 106  * Use:         Adds entropy to the pool.
 107  */
 108
 109 extern void rand_add(const void */*p*/, size_t /*sz*/);
 110
 111 /* --- @rand_extract@ --- *
 112  *
 113  * Arguments:   @unsigned char *b@ = pointer to output buffer
 114  *              @size_t sz@ = number of bytes wanted
 115  *
 116  * Returns:     ---
 117  *
 118  * Use:         Produces a number of random bytes.
 119  */
 120
 121 extern void rand_extract(unsigned char */*b*/, size_t /*sz*/);
 122
 123 /* --- @rand_churn@ --- *
 124  *
 125  * Arguments:   ---
 126  *
 127  * Returns:     ---
 128  *
 129  * Use:         Churns the randomness pool completely.  The pool is replaced
 130  *              by repeated MD5-ings of itself.
 131  */
 132
 133 extern void rand_churn(void);
 134
 135 /*----- That's all, folks -------------------------------------------------*/
 136
 137 #ifdef __cplusplus
 138   }
 139 #endif
 140
 141 #endif