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

   1 /* -*-c-*-
   2  *
   3  * $Id: blowfish.h,v 1.3 1997/08/07 09:43:20 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 1.3  1997/08/07 09:43:20  mdw
  33  * Fix address of the FSF.
  34  *
  35  * Revision 1.2  1997/08/04 10:24:20  mdw
  36  * Sources placed under CVS control.
  37  *
  38  * Revision 1.1  1997/07/21  13:47:53  mdw
  39  * Initial revision
  40  *
  41  */
  42
  43 #ifndef BLOWFISH_H
  44 #define BLOWFISH_H
  45
  46 #ifdef __cplusplus
  47   extern "C" {
  48 #endif
  49
  50 /*----- Type definitions --------------------------------------------------*/
  51
  52 /* --- A blowfish expanded key --- */
  53
  54 typedef struct blowfish_key {
  55   uint_32 p[18];
  56   uint_32 s0[256];
  57   uint_32 s1[256];
  58   uint_32 s2[256];
  59   uint_32 s3[256];
  60 } blowfish_key;
  61
  62 /*----- Functions provided ------------------------------------------------*/
  63
  64 /* --- @blowfish_encrypt@ --- *
  65  *
  66  * Arguments:   @const blowfish_key *k@ = pointer to key block
  67  *              @const voic *from@ = block to encrypt from
  68  *              @void *to@ = block to encrypt to
  69  *
  70  * Returns:     ---
  71  *
  72  * Use:         Encrypts a block using the Blowfish algorithm.
  73  */
  74
  75 extern void blowfish_encrypt(const blowfish_key */*k*/,
  76                              const void */*from*/, void */*to*/);
  77
  78
  79 /* --- @blowfish_decrypt@ --- *
  80  *
  81  * Arguments:   @const blowfish_key *k@ = pointer to key block
  82  *              @const void *from@ = block to decrypt from
  83  *              @void *to@ = block to decrypt to
  84  *
  85  * Returns:     ---
  86  *
  87  * Use:         Decrypts a block using the Blowfish algorithm.
  88  */
  89
  90 extern void blowfish_decrypt(const blowfish_key */*k*/,
  91                              const void */*from*/, void */*to*/);
  92
  93 /* --- @blowfish_setKey@ --- *
  94  *
  95  * Arguments:   @blowfish_key *kb@ = pointer to key block to fill
  96  *              @void *k@ = pointer to key data
  97  *              @size_t sz@ = length of data in bytes
  98  *
  99  * Returns:     ---
 100  *
 101  * Use:         Expands a key which isn't represented as a number of whole
 102  *              words.  This is a nonstandard extension, although it can be
 103  *              used to support 40-bit keys, which some governments might
 104  *              find more palatable than 160-bit (or 448-bit!) keys.
 105  */
 106
 107 extern void blowfish_setKey(blowfish_key */*kb*/,
 108                             const void */*k*/, size_t /*sz*/);
 109
 110 /*----- That's all, folks -------------------------------------------------*/
 111
 112 #ifdef __cplusplus
 113   }
 114 #endif
 115
 116 #endif