3 * $Id: serpent.h,v 1.2 2000/10/08 15:48:58 mdw Exp $
5 * The Serpent block cipher
7 * (c) 2000 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 --------------------------------------------------*
33 * Revision 1.2 2000/10/08 15:48:58 mdw
34 * Update comments now that AES has been chosen.
36 * Revision 1.1 2000/06/17 12:08:43 mdw
41 /*----- Notes on the Serpent block cipher ---------------------------------*
43 * Serpent was designed and proposed for the AES contest by Ross Anderson,
44 * Eli Biham and Lars Knudsen. It's not particularly quick, but is
45 * stunningly secure. The best differential and linear attacks are
46 * speculated to require %$2^{256}$% texts (it's a 128-bit block cipher).
47 * The designers originally intended to file a patent, but failed to persue
48 * it. Use of the algorithm is completely unencumbered.
51 #ifndef CATACOMB_SERPENT_H
52 #define CATACOMB_SERPENT_H
58 /*----- Header files ------------------------------------------------------*/
62 #include <mLib/bits.h>
64 /*----- Magic numbers -----------------------------------------------------*/
66 #define SERPENT_BLKSZ 16
67 #define SERPENT_KEYSZ 32
68 #define SERPENT_CLASS (N, L, 128)
70 extern const octet serpent_keysz
[];
72 /*----- Data structures ---------------------------------------------------*/
74 typedef struct serpent_ctx
{
78 /*----- Functions provided ------------------------------------------------*/
80 /* --- @serpent_init@ --- *
82 * Arguments: @serpent_ctx *k@ = pointer to context block to initialize
83 * @const void *buf@ = pointer to input buffer
84 * @size_t sz@ = size of input buffer
88 * Use: Initializes a Serpent context. The key may be any length of
89 * up to 32 bytes (256 bits).
92 extern void serpent_init(serpent_ctx */
*k*/
,
93 const void */
*buf*/
, size_t /*sz*/);
95 /* --- @serpent_eblk@, @serpent_dblk@ --- *
97 * Arguments: @const serpent_ctx *k@ = pointer to key context
98 * @const uint32 s[4]@ = pointer to source block
99 * @uint32 d[4]@ = pointer to destination block
103 * Use: Low-level block encryption.
106 extern void serpent_eblk(const serpent_ctx */
*k*/
,
107 const uint32 */
*s*/
, uint32 */
*d*/
);
108 extern void serpent_dblk(const serpent_ctx */
*k*/
,
109 const uint32 */
*s*/
, uint32 */
*d*/
);
111 /*----- That's all, folks -------------------------------------------------*/