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   1 /* -*-c-*-
   2  *
   3  * $Id: blowfish.h,v 1.2 1999/12/10 23:29:48 mdw Exp $
   4  *
   5  * The Blowfish block cipher
   6  *
   7  * (c) 1998 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: blowfish.h,v $
  33  * Revision 1.2  1999/12/10 23:29:48  mdw
  34  * Change header file guard names.
  35  *
  36  * Revision 1.1  1999/09/03 08:41:11  mdw
  37  * Initial import.
  38  *
  39  */
  40
  41 /*----- Notes on the Blowfish block cipher --------------------------------*
  42  *
  43  * Blowfish was invented by Bruce Schneier.  The algorithm is unpatented and
  44  * free for anyone to use.  It's fast, simple, offers a big key, and is
  45  * looking relatively bulletproof.  It's also this author's block cipher of
  46  * choice, for what little that's worth.  The disadvantage is that Blowfish
  47  * has a particularly heavyweight key schedule.
  48  */
  49
  50 #ifndef CATACOMB_BLOWFISH_H
  51 #define CATACOMB_BLOWFISH_H
  52
  53 #ifdef __cplusplus
  54   extern "C" {
  55 #endif
  56
  57 /*----- Header files ------------------------------------------------------*/
  58
  59 #include <stddef.h>
  60
  61 #include <mLib/bits.h>
  62
  63 /*----- Magical numbers ---------------------------------------------------*/
  64
  65 #define BLOWFISH_BLKSZ 8
  66 #define BLOWFISH_KEYSZ 0
  67 #define BLOWFISH_CLASS (N, B, 64)
  68
  69 /*----- Data structures ---------------------------------------------------*/
  70
  71 typedef struct blowfish_ctx {
  72   uint32 p[18];
  73   uint32 s0[256], s1[256], s2[256], s3[256];
  74 } blowfish_ctx;
  75
  76 /*----- Functions provided ------------------------------------------------*/
  77
  78 /* --- @blowfish_init@ --- *
  79  *
  80  * Arguments:   @blowfish_ctx *k@ = pointer to key block to fill in
  81  *              @const void *buf@ = pointer to buffer of key material
  82  *              @size_t sz@ = size of key material
  83  *
  84  * Returns:     ---
  85  *
  86  * Use:         Initializes a Blowfish key buffer.  Blowfish accepts
  87  *              a more-or-less arbitrary size key.
  88  */
  89
  90 extern void blowfish_init(blowfish_ctx */*k*/,
  91                           const void */*buf*/, size_t /*sz*/);
  92
  93 /* --- @blowfish_eblk@, @blowfish_dblk@ --- *
  94  *
  95  * Arguments:   @const blowfish_ctx *k@ = pointer to key block
  96  *              @const uint32 s[2]@ = pointer to source block
  97  *              @uint32 d[2]@ = pointer to destination block
  98  *
  99  * Returns:     ---
 100  *
 101  * Use:         Low-level block encryption and decryption.
 102  */
 103
 104 extern void blowfish_eblk(const blowfish_ctx */*k*/,
 105                           const uint32 */*s*/, uint32 */*d*/);
 106
 107 extern void blowfish_dblk(const blowfish_ctx */*k*/,
 108                           const uint32 */*s*/, uint32 */*d*/);
 109
 110 /*----- That's all, folks -------------------------------------------------*/
 111
 112 #ifdef __cplusplus
 113   }
 114 #endif
 115
 116 #endif