| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: grand.h,v 1.5 2004/04/08 01:36:15 mdw Exp $ |
| 4 | * |
| 5 | * Generic interface to random number generators |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb 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 Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | #ifndef CATACOMB_GRAND_H |
| 31 | #define CATACOMB_GRAND_H |
| 32 | |
| 33 | #ifdef __cplusplus |
| 34 | extern "C" { |
| 35 | #endif |
| 36 | |
| 37 | /*----- Header files ------------------------------------------------------*/ |
| 38 | |
| 39 | #include <assert.h> |
| 40 | #include <stddef.h> |
| 41 | |
| 42 | #include <mLib/bits.h> |
| 43 | |
| 44 | /*----- Generic random number generator interface -------------------------*/ |
| 45 | |
| 46 | typedef struct grand { |
| 47 | const struct grand_ops *ops; |
| 48 | } grand; |
| 49 | |
| 50 | typedef struct grand_ops { |
| 51 | |
| 52 | /* --- Various important properties --- */ |
| 53 | |
| 54 | const char *name; /* Generator's name */ |
| 55 | unsigned f; /* Various flags */ |
| 56 | uint32 max; /* Maximum raw output */ |
| 57 | |
| 58 | /* --- Maintenance methods --- */ |
| 59 | |
| 60 | int (*misc)(grand */*r*/, unsigned /*op*/, ...); /* Miscellaneous ops */ |
| 61 | void (*destroy)(grand */*r*/); /* Destroy generator context */ |
| 62 | |
| 63 | /* --- Output methods --- * |
| 64 | * |
| 65 | * Only one of these operations need actually be implemented. All the |
| 66 | * other operations may be synthesized. Of course, performance is improved |
| 67 | * if more are provided. |
| 68 | */ |
| 69 | |
| 70 | uint32 (*raw)(grand */*r*/); /* Uniform over %$[0, max)$% */ |
| 71 | octet (*byte)(grand */*r*/); /* Uniform over %$[0, 256)$% */ |
| 72 | uint32 (*word)(grand */*r*/); /* Uniform over %$[0, 2^{32})$% */ |
| 73 | uint32 (*range)(grand */*r*/, uint32 /*l*/); /* Uniform over %$[0, l)$% */ |
| 74 | void (*fill)(grand */*r*/, void */*p*/, size_t /*sz*/); /* Fill buffer */ |
| 75 | } grand_ops; |
| 76 | |
| 77 | #define GR_DESTROY(r) (r)->ops->destroy((r)) |
| 78 | #define GR_RAW(r) (r)->ops->raw((r)) |
| 79 | #define GR_WORD(r) (r)->ops->word((r)) |
| 80 | #define GR_RANGE(r, l) (r)->ops->range((r), (l)) |
| 81 | #define GR_FILL(r, p, sz) (r)->ops->fill((r), (p), (sz)) |
| 82 | |
| 83 | /* --- Flag types --- */ |
| 84 | |
| 85 | #define GRAND_CRYPTO 1u /* Cryptographically strong */ |
| 86 | |
| 87 | /* --- Operation types --- */ |
| 88 | |
| 89 | enum { |
| 90 | |
| 91 | /* --- Required operations --- */ |
| 92 | |
| 93 | GRAND_CHECK, /* @unsigned op2@ */ |
| 94 | |
| 95 | /* --- Standard seeding operations --- */ |
| 96 | |
| 97 | GRAND_SEEDINT, /* @int i@ */ |
| 98 | GRAND_SEEDUINT32, /* @uint32 i@ */ |
| 99 | GRAND_SEEDBLOCK, /* @const void *p, size_t sz@ */ |
| 100 | GRAND_SEEDMP, /* @mp *m@ */ |
| 101 | GRAND_SEEDRAND /* @grand *g@ */ |
| 102 | |
| 103 | /* --- Generator-specific operations --- */ |
| 104 | |
| 105 | #define GRAND_SPECIFIC(ch) ((unsigned)(ch) << 8) |
| 106 | }; |
| 107 | |
| 108 | #define GRAND_BADOP assert(((void)"bad grand_misc op", 0)) |
| 109 | |
| 110 | /*----- Functions provided ------------------------------------------------*/ |
| 111 | |
| 112 | /* --- @grand_byte@ --- * |
| 113 | * |
| 114 | * Arguments: @grand *r@ = pointet to generic generator |
| 115 | * |
| 116 | * Returns: A uniformly-distributed pseudorandom integer in the interval |
| 117 | * %$[0, 256)$%. |
| 118 | */ |
| 119 | |
| 120 | extern octet grand_byte(grand */*r*/); |
| 121 | |
| 122 | /* --- @grand_word@ --- * |
| 123 | * |
| 124 | * Arguments: @grand *r@ = pointet to generic generator |
| 125 | * |
| 126 | * Returns: A uniformly-distributed pseudorandom integer in the interval |
| 127 | * %$[0, 2^{32})$%. |
| 128 | */ |
| 129 | |
| 130 | extern uint32 grand_word(grand */*r*/); |
| 131 | |
| 132 | /* --- @grand_range@ --- * |
| 133 | * |
| 134 | * Arguments: @grand *r@ = pointet to generic generator |
| 135 | * @uint32 l@ = limit for acceptable results |
| 136 | * |
| 137 | * Returns: A uniformly-distributed pseudorandom integer in the interval |
| 138 | * %$[0, l)$%. |
| 139 | */ |
| 140 | |
| 141 | extern uint32 grand_range(grand */*r*/, uint32 /*l*/); |
| 142 | |
| 143 | /* --- @grand_fill@ --- * |
| 144 | * |
| 145 | * Arguments: @grand *r@ = pointet to generic generator |
| 146 | * @void *p@ = pointer to a buffer |
| 147 | * @size_t sz@ = size of the buffer |
| 148 | * |
| 149 | * Returns: --- |
| 150 | * |
| 151 | * Use: Fills a buffer with uniformly distributed pseudorandom bytes |
| 152 | * (see @grand_byte@). |
| 153 | */ |
| 154 | |
| 155 | extern void grand_fill(grand */*r*/, void */*p*/, size_t /*sz*/); |
| 156 | |
| 157 | /*----- That's all, folks -------------------------------------------------*/ |
| 158 | |
| 159 | #ifdef __cplusplus |
| 160 | } |
| 161 | #endif |
| 162 | |
| 163 | #endif |