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

   1 /*
   2  * Copyright (C) 1997,2000 Ian Jackson
   3  *
   4  * This is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with userv-utils; if not, write to the Free Software
  16  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #ifndef BLOWFISH__H_INCLUDED
  20 #define BLOWFISH__H_INCLUDED
  21
  22 #include <stdint.h>
  23
  24 #define BLOWFISH_BLOCKBYTES 8
  25 #define BLOWFISH_MAXKEYBYTES 56
  26 #define BLOWFISH__N 16
  27 #define BLOWFISH__PSIZE BLOWFISH__N+2
  28
  29 typedef uint32_t blowfish__p[BLOWFISH__PSIZE];
  30 typedef uint32_t blowfish__s[4][256];
  31
  32 struct blowfish_expandedkey {
  33   blowfish__p p;
  34   blowfish__s s;
  35 };
  36
  37 /* It's ok to pass the [_cbc]_(en|de)crypt functions the same
  38  * input and output pointers.
  39  */
  40
  41 void blowfish_loadkey(struct blowfish_expandedkey *ek,
  42                       const uint8_t *key, int keybytes);
  43 void blowfish_encrypt(const struct blowfish_expandedkey *ek,
  44                       const uint8_t plain[BLOWFISH_BLOCKBYTES],
  45                       uint8_t cipher[BLOWFISH_BLOCKBYTES]);
  46 void blowfish_decrypt(const struct blowfish_expandedkey *ek,
  47                       const uint8_t cipher[BLOWFISH_BLOCKBYTES],
  48                       uint8_t plain[BLOWFISH_BLOCKBYTES]);
  49
  50 struct blowfish_cbc_state {
  51   struct blowfish_expandedkey ek;
  52   uint32_t chainl, chainr;
  53 };
  54
  55 void blowfish_cbc_setiv(struct blowfish_cbc_state *cs,
  56                         const uint8_t iv[BLOWFISH_BLOCKBYTES]);
  57 void blowfish_cbc_encrypt(struct blowfish_cbc_state *cs,
  58                           const uint8_t plain[BLOWFISH_BLOCKBYTES],
  59                           uint8_t cipher[BLOWFISH_BLOCKBYTES]);
  60 void blowfish_cbc_decrypt(struct blowfish_cbc_state *cs,
  61                           const uint8_t cipher[BLOWFISH_BLOCKBYTES],
  62                           uint8_t plain[BLOWFISH_BLOCKBYTES]);
  63
  64 #endif