3 * $Id: blowfish.h,v 1.3 2000/06/17 10:48:13 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 /*----- Revision history --------------------------------------------------*
32 * $Log: blowfish.h,v $
33 * Revision 1.3 2000/06/17 10:48:13 mdw
34 * Support new key size interface.
36 * Revision 1.2 1999/12/10 23:29:48 mdw
37 * Change header file guard names.
39 * Revision 1.1 1999/09/03 08:41:11 mdw
44 /*----- Notes on the Blowfish block cipher --------------------------------*
46 * Blowfish was invented by Bruce Schneier. The algorithm is unpatented and
47 * free for anyone to use. It's fast, simple, offers a big key, and is
48 * looking relatively bulletproof. It's also this author's block cipher of
49 * choice, for what little that's worth. The disadvantage is that Blowfish
50 * has a particularly heavyweight key schedule.
53 #ifndef CATACOMB_BLOWFISH_H
54 #define CATACOMB_BLOWFISH_H
60 /*----- Header files ------------------------------------------------------*/
64 #include <mLib/bits.h>
66 /*----- Magical numbers ---------------------------------------------------*/
68 #define BLOWFISH_BLKSZ 8
69 #define BLOWFISH_KEYSZ 32
70 #define BLOWFISH_CLASS (N, B, 64)
72 extern const octet blowfish_keysz
[];
74 /*----- Data structures ---------------------------------------------------*/
76 typedef struct blowfish_ctx
{
78 uint32 s0
[256], s1
[256], s2
[256], s3
[256];
81 /*----- Functions provided ------------------------------------------------*/
83 /* --- @blowfish_init@ --- *
85 * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in
86 * @const void *buf@ = pointer to buffer of key material
87 * @size_t sz@ = size of key material
91 * Use: Initializes a Blowfish key buffer. Blowfish accepts
92 * a more-or-less arbitrary size key.
95 extern void blowfish_init(blowfish_ctx */
*k*/
,
96 const void */
*buf*/
, size_t /*sz*/);
98 /* --- @blowfish_eblk@, @blowfish_dblk@ --- *
100 * Arguments: @const blowfish_ctx *k@ = pointer to key block
101 * @const uint32 s[2]@ = pointer to source block
102 * @uint32 d[2]@ = pointer to destination block
106 * Use: Low-level block encryption and decryption.
109 extern void blowfish_eblk(const blowfish_ctx */
*k*/
,
110 const uint32 */
*s*/
, uint32 */
*d*/
);
112 extern void blowfish_dblk(const blowfish_ctx */
*k*/
,
113 const uint32 */
*s*/
, uint32 */
*d*/
);
115 /*----- That's all, folks -------------------------------------------------*/