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   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