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

   1 /* -*-c-*-
   2  *
   3  * The SSL pseudo-random function
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef CATACOMB_SSLPRF_H
  29 #define CATACOMB_SSLPRF_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #ifndef CATACOMB_GMAC_H
  38 #  include "gmac.h"
  39 #endif
  40
  41 #ifndef CATACOMB_GRAND_H
  42 #  include "grand.h"
  43 #endif
  44
  45 /*----- Data structures ---------------------------------------------------*/
  46
  47 typedef struct sslprf_ctx {
  48   const gchash *co, *ci;                /* Outer and inner hash functions */
  49   size_t ohashsz, ihashsz;              /* Size of the hash outputs */
  50   ghash *h;                             /* Hash context from last time */
  51   const octet *k;                       /* Pointer to the secret */
  52   size_t ksz;                           /* Size of the secret buffer */
  53   const octet *sd;                      /* Pointer to the seed */
  54   size_t sdsz;                          /* Size of the seed buffer */
  55   unsigned i;                           /* Which iteration this is */
  56   octet *p;                             /* Pointer to output buffer */
  57   size_t sz;                            /* How many bytes are left */
  58 } sslprf_ctx;
  59
  60 /*----- Functions provided ------------------------------------------------*/
  61
  62 /* --- @sslprf_init@ --- *
  63  *
  64  * Arguments:   @sslprf_ctx *c@ = pointer to a context structure
  65  *              @const gchash *hco, *hci@ = outer and inner hash functions
  66  *              @const void *k@ = pointer to secret buffer
  67  *              @size_t ksz@ = size of the secret
  68  *              @const void *sd@ = pointer to seed buffer
  69  *              @size_t sdsz@ = size of the seed
  70  *
  71  * Returns:     ---
  72  *
  73  * Use:         Initializes an SSL generator context.
  74  */
  75
  76 extern void sslprf_init(sslprf_ctx */*c*/,
  77                         const gchash */*hco*/, const gchash */*hci*/,
  78                         const void */*k*/, size_t /*ksz*/,
  79                         const void */*sd*/, size_t /*sdsz*/);
  80
  81 /* --- @sslprf_encrypt@ --- *
  82  *
  83  * Arguments:   @sslprf_ctx *c@ = pointer to a context structure
  84  *              @const void *src@ = pointer to source buffer
  85  *              @void *dest@ = pointer to destination buffer
  86  *              @size_t sz@ = size of the buffers
  87  *
  88  * Returns:     ---
  89  *
  90  * Use:         Encrypts data using the SSL pseudo-random function.  If the
  91  *              destination pointer is null, the generator is spun and no
  92  *              output is produced; if the source pointer is null, raw output
  93  *              from the generator is written; otherwise, the source data is
  94  *              XORed with the generator output.
  95  */
  96
  97 extern void sslprf_encrypt(sslprf_ctx */*c*/,
  98                            const void */*src*/, void */*dest*/,
  99                            size_t /*sz*/);
 100
 101 /* --- @sslprf_free@ --- *
 102  *
 103  * Arguments:   @sslprf_ctx@ = pointer to a context
 104  *
 105  * Returns:     ---
 106  *
 107  * Use:         Frees resources held in an SSL generator context.
 108  */
 109
 110 extern void sslprf_free(sslprf_ctx */*c*/);
 111
 112 /* ---@sslprf_rand@ --- *
 113  *
 114  * Arguments:   @const gchash *hco, const gchash *hci@ = hash functions
 115  *              @const void *k@ = pointer to the key material
 116  *              @size_t ksz@ = size of the key material
 117  *              @const void *sd@ = pointer to the seed material
 118  *              @size_t sdsz@ = size of the seed material
 119  *
 120  * Returns:     Pointer to generic random number generator interface.
 121  *
 122  * Use:         Creates a generic generator which does TLS data expansion.
 123  */
 124
 125 extern grand *sslprf_rand(const gchash */*hco*/, const gchash */*hci*/,
 126                           const void */*k*/, size_t /*ksz*/,
 127                           const void */*sd*/, size_t /*sdsz*/);
 128
 129 /*----- That's all, folks -------------------------------------------------*/
 130
 131 #ifdef __cplusplus
 132   }
 133 #endif
 134
 135 #endif