mdw@git.distorted.org.uk Git - become/blob - src/blowfish.h

   1 /* -*-c-*-
   2  *
   3  * $Id: blowfish.h,v 1.4 1997/09/26 09:14:57 mdw Exp $
   4  *
   5  * Blowfish encryption routines
   6  *
   7  * (c) 1997 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of `become'
  13  *
  14  * `Become' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `Become' 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 General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `become'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: blowfish.h,v $
  32  * Revision 1.4  1997/09/26 09:14:57  mdw
  33  * Merged blowfish branch into trunk.
  34  *
  35  * Revision 1.3.2.1  1997/09/26 09:07:59  mdw
  36  * Use the Blowfish encryption algorithm instead of IDEA.  This is partly
  37  * because I prefer Blowfish (without any particularly strong evidence) but
  38  * mainly because IDEA is patented and Blowfish isn't.
  39  *
  40  * Revision 1.3  1997/08/07 09:43:20  mdw
  41  * Fix address of the FSF.
  42  *
  43  * Revision 1.2  1997/08/04 10:24:20  mdw
  44  * Sources placed under CVS control.
  45  *
  46  * Revision 1.1  1997/07/21  13:47:53  mdw
  47  * Initial revision
  48  *
  49  */
  50
  51 #ifndef BLOWFISH_H
  52 #define BLOWFISH_H
  53
  54 #ifdef __cplusplus
  55   extern "C" {
  56 #endif
  57
  58 /*----- Required headers --------------------------------------------------*/
  59
  60 #ifndef CONFIG_H
  61 #  include "config.h"
  62 #endif
  63
  64 /*----- Type definitions --------------------------------------------------*/
  65
  66 /* --- A blowfish expanded key --- */
  67
  68 typedef struct blowfish_key {
  69   uint_32 p[18];
  70   uint_32 s0[256];
  71   uint_32 s1[256];
  72   uint_32 s2[256];
  73   uint_32 s3[256];
  74 } blowfish_key;
  75
  76 /* --- Size of a blowfish block --- */
  77
  78 #define BLOWFISH_BLKSIZE (8u)
  79
  80 /*----- Functions provided ------------------------------------------------*/
  81
  82 /* --- @blowfish_encrypt@ --- *
  83  *
  84  * Arguments:   @const blowfish_key *k@ = pointer to key block
  85  *              @const voic *from@ = block to encrypt from
  86  *              @void *to@ = block to encrypt to
  87  *
  88  * Returns:     ---
  89  *
  90  * Use:         Encrypts a block using the Blowfish algorithm.
  91  */
  92
  93 extern void blowfish_encrypt(const blowfish_key */*k*/,
  94                              const void */*from*/, void */*to*/);
  95
  96
  97 /* --- @blowfish_decrypt@ --- *
  98  *
  99  * Arguments:   @const blowfish_key *k@ = pointer to key block
 100  *              @const void *from@ = block to decrypt from
 101  *              @void *to@ = block to decrypt to
 102  *
 103  * Returns:     ---
 104  *
 105  * Use:         Decrypts a block using the Blowfish algorithm.
 106  */
 107
 108 extern void blowfish_decrypt(const blowfish_key */*k*/,
 109                              const void */*from*/, void */*to*/);
 110
 111 /* --- @blowfish_setKey@ --- *
 112  *
 113  * Arguments:   @blowfish_key *kb@ = pointer to key block to fill
 114  *              @void *k@ = pointer to key data
 115  *              @size_t sz@ = length of data in bytes
 116  *
 117  * Returns:     ---
 118  *
 119  * Use:         Expands a key which isn't represented as a number of whole
 120  *              words.  This is a nonstandard extension, although it can be
 121  *              used to support 40-bit keys, which some governments might
 122  *              find more palatable than 160-bit (or 448-bit!) keys.
 123  */
 124
 125 extern void blowfish_setKey(blowfish_key */*kb*/,
 126                             const void */*k*/, size_t /*sz*/);
 127
 128 /*----- That's all, folks -------------------------------------------------*/
 129
 130 #ifdef __cplusplus
 131   }
 132 #endif
 133
 134 #endif