3 * $Id: blowfish.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
5 * The Blowfish block cipher
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb 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 Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Notes on the Blowfish block cipher --------------------------------*
32 * Blowfish was invented by Bruce Schneier. The algorithm is unpatented and
33 * free for anyone to use. It's fast, simple, offers a big key, and is
34 * looking relatively bulletproof. It's also this author's block cipher of
35 * choice, for what little that's worth. The disadvantage is that Blowfish
36 * has a particularly heavyweight key schedule.
39 #ifndef CATACOMB_BLOWFISH_H
40 #define CATACOMB_BLOWFISH_H
46 /*----- Header files ------------------------------------------------------*/
50 #include <mLib/bits.h>
52 /*----- Magical numbers ---------------------------------------------------*/
54 #define BLOWFISH_BLKSZ 8
55 #define BLOWFISH_KEYSZ 32
56 #define BLOWFISH_CLASS (N, B, 64)
58 extern const octet blowfish_keysz
[];
60 /*----- Data structures ---------------------------------------------------*/
62 typedef struct blowfish_ctx
{
64 uint32 s0
[256], s1
[256], s2
[256], s3
[256];
67 /*----- Functions provided ------------------------------------------------*/
69 /* --- @blowfish_init@ --- *
71 * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in
72 * @const void *buf@ = pointer to buffer of key material
73 * @size_t sz@ = size of key material
77 * Use: Initializes a Blowfish key buffer. Blowfish accepts
78 * a more-or-less arbitrary size key.
81 extern void blowfish_init(blowfish_ctx */
*k*/
,
82 const void */
*buf*/
, size_t /*sz*/);
84 /* --- @blowfish_eblk@, @blowfish_dblk@ --- *
86 * Arguments: @const blowfish_ctx *k@ = pointer to key block
87 * @const uint32 s[2]@ = pointer to source block
88 * @uint32 d[2]@ = pointer to destination block
92 * Use: Low-level block encryption and decryption.
95 extern void blowfish_eblk(const blowfish_ctx */
*k*/
,
96 const uint32 */
*s*/
, uint32 */
*d*/
);
98 extern void blowfish_dblk(const blowfish_ctx */
*k*/
,
99 const uint32 */
*s*/
, uint32 */
*d*/
);
101 /*----- That's all, folks -------------------------------------------------*/