mdw@git.distorted.org.uk Git - userv-utils/blob - ipif/blowfish.h

   1 /*
   2  * This file is part of ipif, part of userv-utils
   3  *
   4  * Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
   5  * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
   6  * Copyright 1999,2003
   7  *    Chancellor Masters and Scholars of the University of Cambridge
   8  * Copyright 2010 Tony Finch <fanf@dotat.at>
   9  *
  10  * This is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with userv-utils; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifndef BLOWFISH__H_INCLUDED
  25 #define BLOWFISH__H_INCLUDED
  26
  27 #include <stdint.h>
  28
  29 #define BLOWFISH_BLOCKBYTES 8
  30 #define BLOWFISH_MAXKEYBYTES 56
  31 #define BLOWFISH__N 16
  32 #define BLOWFISH__PSIZE BLOWFISH__N+2
  33
  34 typedef uint32_t blowfish__p[BLOWFISH__PSIZE];
  35 typedef uint32_t blowfish__s[4][256];
  36
  37 struct blowfish_expandedkey {
  38   blowfish__p p;
  39   blowfish__s s;
  40 };
  41
  42 /* It's ok to pass the [_cbc]_(en|de)crypt functions the same
  43  * input and output pointers.
  44  */
  45
  46 void blowfish_loadkey(struct blowfish_expandedkey *ek,
  47                       const uint8_t *key, int keybytes);
  48 void blowfish_encrypt(const struct blowfish_expandedkey *ek,
  49                       const uint8_t plain[BLOWFISH_BLOCKBYTES],
  50                       uint8_t cipher[BLOWFISH_BLOCKBYTES]);
  51 void blowfish_decrypt(const struct blowfish_expandedkey *ek,
  52                       const uint8_t cipher[BLOWFISH_BLOCKBYTES],
  53                       uint8_t plain[BLOWFISH_BLOCKBYTES]);
  54
  55 struct blowfish_cbc_state {
  56   struct blowfish_expandedkey ek;
  57   uint32_t chainl, chainr;
  58 };
  59
  60 void blowfish_cbc_setiv(struct blowfish_cbc_state *cs,
  61                         const uint8_t iv[BLOWFISH_BLOCKBYTES]);
  62 void blowfish_cbc_encrypt(struct blowfish_cbc_state *cs,
  63                           const uint8_t plain[BLOWFISH_BLOCKBYTES],
  64                           uint8_t cipher[BLOWFISH_BLOCKBYTES]);
  65 void blowfish_cbc_decrypt(struct blowfish_cbc_state *cs,
  66                           const uint8_t cipher[BLOWFISH_BLOCKBYTES],
  67                           uint8_t plain[BLOWFISH_BLOCKBYTES]);
  68
  69 #endif