| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: rand.h,v 1.2 1998/01/12 16:46:24 mdw Exp $ |
| 4 | * |
| 5 | * Random number generation |
| 6 | * |
| 7 | * (c) 1998 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 1.2 1998/01/12 16:46:24 mdw |
| 33 | * Fix copyright date. |
| 34 | * |
| 35 | * Revision 1.1 1997/08/07 09:46:05 mdw |
| 36 | * New source file added to maintain a randomness pool. |
| 37 | * |
| 38 | */ |
| 39 | |
| 40 | #ifndef RAND_H |
| 41 | #define RAND_H |
| 42 | |
| 43 | #ifdef __cplusplus |
| 44 | extern "C" { |
| 45 | #endif |
| 46 | |
| 47 | /*----- Required headers --------------------------------------------------*/ |
| 48 | |
| 49 | #include <stdio.h> |
| 50 | |
| 51 | #ifndef ICRYPT_H |
| 52 | # include "icrypt.h" |
| 53 | #endif |
| 54 | |
| 55 | /*----- Functions provided ------------------------------------------------*/ |
| 56 | |
| 57 | /* --- @rand_read@ --- * |
| 58 | * |
| 59 | * Arguments: @FILE *fp@ = pointer to file to read from |
| 60 | * |
| 61 | * Returns: --- |
| 62 | * |
| 63 | * Use: Reads a random number seed from the stream. |
| 64 | */ |
| 65 | |
| 66 | extern void rand_read(FILE */*fp*/); |
| 67 | |
| 68 | /* --- @rand_write@ --- * |
| 69 | * |
| 70 | * Arguments: @FILE *fp@ = pointer to file to write on |
| 71 | * |
| 72 | * Returns: --- |
| 73 | * |
| 74 | * Use: Writes a random number seed back to the stream. |
| 75 | */ |
| 76 | |
| 77 | extern void rand_write(FILE */*fp*/); |
| 78 | |
| 79 | /* --- @rand_clear@ --- * |
| 80 | * |
| 81 | * Arguments: --- |
| 82 | * |
| 83 | * Returns: --- |
| 84 | * |
| 85 | * Use: Clears the random number pool. |
| 86 | */ |
| 87 | |
| 88 | extern void rand_clear(void); |
| 89 | |
| 90 | /* --- @rand_encrypt@ --- * |
| 91 | * |
| 92 | * Arguments: @icrypt_job *j@ = pointer to an encryption job to apply |
| 93 | * |
| 94 | * Returns: --- |
| 95 | * |
| 96 | * Use: Encrypts the randomness pool with a given key. This should |
| 97 | * be done before use, in case the pool gets compromised. |
| 98 | */ |
| 99 | |
| 100 | extern void rand_encrypt(icrypt_job */*j*/); |
| 101 | |
| 102 | /* --- @rand_add@ --- * |
| 103 | * |
| 104 | * Arguments: @const void *p@ = pointer to some data |
| 105 | * @size_t sz@ = size of the data in bytes |
| 106 | * |
| 107 | * Returns: --- |
| 108 | * |
| 109 | * Use: Adds entropy to the pool. |
| 110 | */ |
| 111 | |
| 112 | extern void rand_add(const void */*p*/, size_t /*sz*/); |
| 113 | |
| 114 | /* --- @rand_extract@ --- * |
| 115 | * |
| 116 | * Arguments: @unsigned char *b@ = pointer to output buffer |
| 117 | * @size_t sz@ = number of bytes wanted |
| 118 | * |
| 119 | * Returns: --- |
| 120 | * |
| 121 | * Use: Produces a number of random bytes. |
| 122 | */ |
| 123 | |
| 124 | extern void rand_extract(unsigned char */*b*/, size_t /*sz*/); |
| 125 | |
| 126 | /* --- @rand_churn@ --- * |
| 127 | * |
| 128 | * Arguments: --- |
| 129 | * |
| 130 | * Returns: --- |
| 131 | * |
| 132 | * Use: Churns the randomness pool completely. The pool is replaced |
| 133 | * by repeated MD5-ings of itself. |
| 134 | */ |
| 135 | |
| 136 | extern void rand_churn(void); |
| 137 | |
| 138 | /*----- That's all, folks -------------------------------------------------*/ |
| 139 | |
| 140 | #ifdef __cplusplus |
| 141 | } |
| 142 | #endif |
| 143 | |
| 144 | #endif |