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