git.distorted.org.uk Git - u/mdw/catacomb/blob - sslprf.h

   1 /* -*-c-*-
   2  *
   3  * $Id: sslprf.h,v 1.1 2001/04/06 22:05:10 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 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: sslprf.h,v $
  33  * Revision 1.1  2001/04/06 22:05:10  mdw
  34  * Add support for SSL pseudo-random function.
  35  *
  36  */
  37
  38 #ifndef CATACOMB_SSLPRF_H
  39 #define CATACOMB_SSLPRF_H
  40
  41 #ifdef __cplusplus
  42   extern "C" {
  43 #endif
  44
  45 /*----- Header files ------------------------------------------------------*/
  46
  47 #ifndef CATACOMB_GMAC_H
  48 #  include "gmac.h"
  49 #endif
  50
  51 #ifndef CATACOMB_GRAND_H
  52 #  include "grand.h"
  53 #endif
  54
  55 /*----- Data structures ---------------------------------------------------*/
  56
  57 typedef struct sslprf_ctx {
  58   const gchash *co, *ci;                /* Outer and inner hash functions */
  59   size_t ohashsz, ihashsz;              /* Size of the hash outputs */
  60   ghash *h;                             /* Hash context from last time */
  61   const octet *k;                       /* Pointer to the secret */
  62   size_t ksz;                           /* Size of the secret buffer */
  63   const octet *sd;                      /* Pointer to the seed */
  64   size_t sdsz;                          /* Size of the seed buffer */
  65   unsigned i;                           /* Which iteration this is */
  66   octet *p;                             /* Pointer to output buffer */
  67   size_t sz;                            /* How many bytes are left */
  68 } sslprf_ctx;
  69
  70 /*----- Functions provided ------------------------------------------------*/
  71
  72 /* --- @sslprf_init@ --- *
  73  *
  74  * Arguments:   @sslprf_ctx *c@ = pointer to a context structure
  75  *              @const gchash *hco, *hci@ = outer and inner hash functions
  76  *              @const void *k@ = pointer to secret buffer
  77  *              @size_t ksz@ = size of the secret
  78  *              @const void *sd@ = pointer to seed buffer
  79  *              @size_t sdsz@ = size of the seed
  80  *
  81  * Returns:     ---
  82  *
  83  * Use:         Initializes an SSL generator context.
  84  */
  85
  86 extern void sslprf_init(sslprf_ctx */*c*/,
  87                         const gchash */*hco*/, const gchash */*hci*/,
  88                         const void */*k*/, size_t /*ksz*/,
  89                         const void */*sd*/, size_t /*sdsz*/);
  90
  91 /* --- @sslprf_encrypt@ --- *
  92  *
  93  * Arguments:   @sslprf_ctx *c@ = pointer to a context structure
  94  *              @const void *src@ = pointer to source buffer
  95  *              @void *dest@ = pointer to destination buffer
  96  *              @size_t sz@ = size of the buffers
  97  *
  98  * Returns:     ---
  99  *
 100  * Use:         Encrypts data using the SSL pseudo-random function.  If the
 101  *              destination pointer is null, the generator is spun and no
 102  *              output is produced; if the source pointer is null, raw output
 103  *              from the generator is written; otherwise, the source data is
 104  *              XORed with the generator output.
 105  */
 106
 107 extern void sslprf_encrypt(sslprf_ctx */*c*/,
 108                            const void */*src*/, void */*dest*/,
 109                            size_t /*sz*/);
 110
 111 /* --- @sslprf_free@ --- *
 112  *
 113  * Arguments:   @sslprf_ctx@ = pointer to a context
 114  *
 115  * Returns:     ---
 116  *
 117  * Use:         Frees resources held in an SSL generator context.
 118  */
 119
 120 extern void sslprf_free(sslprf_ctx */*c*/);
 121
 122 /* ---@sslprf_rand@ --- *
 123  *
 124  * Arguments:   @const gchash *hco, const gchash *hci@ = hash functions
 125  *              @const void *k@ = pointer to the key material
 126  *              @size_t ksz@ = size of the key material
 127  *              @const void *sd@ = pointer to the seed material
 128  *              @size_t sdsz@ = size of the seed material
 129  *
 130  * Returns:     Pointer to generic random number generator interface.
 131  *
 132  * Use:         Creates a generic generator which does TLS data expansion.
 133  */
 134
 135 extern grand *sslprf_rand(const gchash */*hco*/, const gchash */*hci*/,
 136                           const void */*k*/, size_t /*ksz*/,
 137                           const void */*sd*/, size_t /*sdsz*/);
 138
 139 /*----- That's all, folks -------------------------------------------------*/
 140
 141 #ifdef __cplusplus
 142   }
 143 #endif
 144
 145 #endif