| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: sslprf.h,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
| 4 | * |
| 5 | * The SSL pseudo-random function |
| 6 | * |
| 7 | * (c) 2001 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_SSLPRF_H |
| 31 | #define CATACOMB_SSLPRF_H |
| 32 | |
| 33 | #ifdef __cplusplus |
| 34 | extern "C" { |
| 35 | #endif |
| 36 | |
| 37 | /*----- Header files ------------------------------------------------------*/ |
| 38 | |
| 39 | #ifndef CATACOMB_GMAC_H |
| 40 | # include "gmac.h" |
| 41 | #endif |
| 42 | |
| 43 | #ifndef CATACOMB_GRAND_H |
| 44 | # include "grand.h" |
| 45 | #endif |
| 46 | |
| 47 | /*----- Data structures ---------------------------------------------------*/ |
| 48 | |
| 49 | typedef struct sslprf_ctx { |
| 50 | const gchash *co, *ci; /* Outer and inner hash functions */ |
| 51 | size_t ohashsz, ihashsz; /* Size of the hash outputs */ |
| 52 | ghash *h; /* Hash context from last time */ |
| 53 | const octet *k; /* Pointer to the secret */ |
| 54 | size_t ksz; /* Size of the secret buffer */ |
| 55 | const octet *sd; /* Pointer to the seed */ |
| 56 | size_t sdsz; /* Size of the seed buffer */ |
| 57 | unsigned i; /* Which iteration this is */ |
| 58 | octet *p; /* Pointer to output buffer */ |
| 59 | size_t sz; /* How many bytes are left */ |
| 60 | } sslprf_ctx; |
| 61 | |
| 62 | /*----- Functions provided ------------------------------------------------*/ |
| 63 | |
| 64 | /* --- @sslprf_init@ --- * |
| 65 | * |
| 66 | * Arguments: @sslprf_ctx *c@ = pointer to a context structure |
| 67 | * @const gchash *hco, *hci@ = outer and inner hash functions |
| 68 | * @const void *k@ = pointer to secret buffer |
| 69 | * @size_t ksz@ = size of the secret |
| 70 | * @const void *sd@ = pointer to seed buffer |
| 71 | * @size_t sdsz@ = size of the seed |
| 72 | * |
| 73 | * Returns: --- |
| 74 | * |
| 75 | * Use: Initializes an SSL generator context. |
| 76 | */ |
| 77 | |
| 78 | extern void sslprf_init(sslprf_ctx */*c*/, |
| 79 | const gchash */*hco*/, const gchash */*hci*/, |
| 80 | const void */*k*/, size_t /*ksz*/, |
| 81 | const void */*sd*/, size_t /*sdsz*/); |
| 82 | |
| 83 | /* --- @sslprf_encrypt@ --- * |
| 84 | * |
| 85 | * Arguments: @sslprf_ctx *c@ = pointer to a context structure |
| 86 | * @const void *src@ = pointer to source buffer |
| 87 | * @void *dest@ = pointer to destination buffer |
| 88 | * @size_t sz@ = size of the buffers |
| 89 | * |
| 90 | * Returns: --- |
| 91 | * |
| 92 | * Use: Encrypts data using the SSL pseudo-random function. If the |
| 93 | * destination pointer is null, the generator is spun and no |
| 94 | * output is produced; if the source pointer is null, raw output |
| 95 | * from the generator is written; otherwise, the source data is |
| 96 | * XORed with the generator output. |
| 97 | */ |
| 98 | |
| 99 | extern void sslprf_encrypt(sslprf_ctx */*c*/, |
| 100 | const void */*src*/, void */*dest*/, |
| 101 | size_t /*sz*/); |
| 102 | |
| 103 | /* --- @sslprf_free@ --- * |
| 104 | * |
| 105 | * Arguments: @sslprf_ctx@ = pointer to a context |
| 106 | * |
| 107 | * Returns: --- |
| 108 | * |
| 109 | * Use: Frees resources held in an SSL generator context. |
| 110 | */ |
| 111 | |
| 112 | extern void sslprf_free(sslprf_ctx */*c*/); |
| 113 | |
| 114 | /* ---@sslprf_rand@ --- * |
| 115 | * |
| 116 | * Arguments: @const gchash *hco, const gchash *hci@ = hash functions |
| 117 | * @const void *k@ = pointer to the key material |
| 118 | * @size_t ksz@ = size of the key material |
| 119 | * @const void *sd@ = pointer to the seed material |
| 120 | * @size_t sdsz@ = size of the seed material |
| 121 | * |
| 122 | * Returns: Pointer to generic random number generator interface. |
| 123 | * |
| 124 | * Use: Creates a generic generator which does TLS data expansion. |
| 125 | */ |
| 126 | |
| 127 | extern grand *sslprf_rand(const gchash */*hco*/, const gchash */*hci*/, |
| 128 | const void */*k*/, size_t /*ksz*/, |
| 129 | const void */*sd*/, size_t /*sdsz*/); |
| 130 | |
| 131 | /*----- That's all, folks -------------------------------------------------*/ |
| 132 | |
| 133 | #ifdef __cplusplus |
| 134 | } |
| 135 | #endif |
| 136 | |
| 137 | #endif |