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

   1 /* -*-c-*-
   2  *
   3  * $Id: blowfish.h,v 1.2 1997/08/04 10:24:20 mdw Exp $
   4  *
   5  * Blowfish encryption routines
   6  *
   7  * (c) 1997 Mark Wooding
   8  */
   9
  10 /*----- Licencing 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
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: blowfish.h,v $
  32  * Revision 1.2  1997/08/04 10:24:20  mdw
  33  * Sources placed under CVS control.
  34  *
  35  * Revision 1.1  1997/07/21  13:47:53  mdw
  36  * Initial revision
  37  *
  38  */
  39
  40 #ifndef BLOWFISH_H
  41 #define BLOWFISH_H
  42
  43 #ifdef __cplusplus
  44   extern "C" {
  45 #endif
  46
  47 /*----- Type definitions --------------------------------------------------*/
  48
  49 /* --- A blowfish expanded key --- */
  50
  51 typedef struct blowfish_key {
  52   uint_32 p[18];
  53   uint_32 s0[256];
  54   uint_32 s1[256];
  55   uint_32 s2[256];
  56   uint_32 s3[256];
  57 } blowfish_key;
  58
  59 /*----- Functions provided ------------------------------------------------*/
  60
  61 /* --- @blowfish_encrypt@ --- *
  62  *
  63  * Arguments:   @const blowfish_key *k@ = pointer to key block
  64  *              @const voic *from@ = block to encrypt from
  65  *              @void *to@ = block to encrypt to
  66  *
  67  * Returns:     ---
  68  *
  69  * Use:         Encrypts a block using the Blowfish algorithm.
  70  */
  71
  72 extern void blowfish_encrypt(const blowfish_key */*k*/,
  73                              const void */*from*/, void */*to*/);
  74
  75
  76 /* --- @blowfish_decrypt@ --- *
  77  *
  78  * Arguments:   @const blowfish_key *k@ = pointer to key block
  79  *              @const void *from@ = block to decrypt from
  80  *              @void *to@ = block to decrypt to
  81  *
  82  * Returns:     ---
  83  *
  84  * Use:         Decrypts a block using the Blowfish algorithm.
  85  */
  86
  87 extern void blowfish_decrypt(const blowfish_key */*k*/,
  88                              const void */*from*/, void */*to*/);
  89
  90 /* --- @blowfish_setKey@ --- *
  91  *
  92  * Arguments:   @blowfish_key *kb@ = pointer to key block to fill
  93  *              @void *k@ = pointer to key data
  94  *              @size_t sz@ = length of data in bytes
  95  *
  96  * Returns:     ---
  97  *
  98  * Use:         Expands a key which isn't represented as a number of whole
  99  *              words.  This is a nonstandard extension, although it can be
 100  *              used to support 40-bit keys, which some governments might
 101  *              find more palatable than 160-bit (or 448-bit!) keys.
 102  */
 103
 104 extern void blowfish_setKey(blowfish_key */*kb*/,
 105                             const void */*k*/, size_t /*sz*/);
 106
 107 /*----- That's all, folks -------------------------------------------------*/
 108
 109 #ifdef __cplusplus
 110   }
 111 #endif
 112
 113 #endif