b348397a |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: desx.h,v 1.1 2001/04/03 19:36:50 mdw Exp $ |
4 | * |
5 | * The DESX algorithm |
6 | * |
7 | * (c) 2001 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
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. |
18 | * |
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. |
23 | * |
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, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: desx.h,v $ |
33 | * Revision 1.1 2001/04/03 19:36:50 mdw |
34 | * New block cipher DESX added. |
35 | * |
36 | */ |
37 | |
38 | /*----- Notes on DESX -----------------------------------------------------* |
39 | * |
40 | * DESX was designed by Ron Rivest in 1986 as a simple and cheap way to |
41 | * strengthen DES against exhaustive search. It also increases the |
42 | * difficulty of differential and linear attacks. |
43 | */ |
44 | |
45 | #ifndef CATACOMB_DESX_H |
46 | #define CATACOMB_DESX_H |
47 | |
48 | #ifdef __cplusplus |
49 | extern "C" { |
50 | #endif |
51 | |
52 | /*----- Header files ------------------------------------------------------*/ |
53 | |
54 | #include <stddef.h> |
55 | |
56 | #include <mLib/bits.h> |
57 | |
58 | #ifndef CATACOMB_DES_H |
59 | # include "des.h" |
60 | #endif |
61 | |
62 | /*----- Magical numbers ---------------------------------------------------*/ |
63 | |
64 | #define DESX_BLKSZ 8 |
65 | #define DESX_KEYSZ 23 |
66 | #define DESX_CLASS (N, B, 64) |
67 | |
68 | extern const octet desx_keysz[]; |
69 | |
70 | /*----- Data structures ---------------------------------------------------*/ |
71 | |
72 | typedef struct desx_ctx { |
73 | des_ctx k; |
74 | uint32 prea, preb; |
75 | uint32 posta, postb; |
76 | } desx_ctx; |
77 | |
78 | /*----- Functions provided ------------------------------------------------*/ |
79 | |
80 | /* --- @desx_init@ --- * |
81 | * |
82 | * Arguments: @desx_ctx *k@ = pointer to key block |
83 | * @const void *buf@ = pointer to key buffer |
84 | * @size_t sz@ = size of key material |
85 | * |
86 | * Returns: --- |
87 | * |
88 | * Use: Initializes a DESX key buffer. The key buffer contains, in |
89 | * order, an optional 8-byte pre-whitening key, a single-DES key |
90 | * (either 7 or 8 bytes), and an optional 8-byte port-whitening |
91 | * key. If no whitening keys are specified, the algorithm |
92 | * becomes the same as single-DES. |
93 | */ |
94 | |
95 | extern void desx_init(desx_ctx */*k*/, const void */*buf*/, size_t /*sz*/); |
96 | |
97 | /* --- @desx_eblk@, @desx_dblk@ --- * |
98 | * |
99 | * Arguments: @const desx_ctx *k@ = pointer to key block |
100 | * @const uint32 s[2]@ = pointer to source block |
101 | * @uint32 d[2]@ = pointer to destination block |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Low-level block encryption and decryption. |
106 | */ |
107 | |
108 | extern void desx_eblk(const desx_ctx */*k*/, |
109 | const uint32 */*s*/, uint32 */*d*/); |
110 | extern void desx_dblk(const desx_ctx */*k*/, |
111 | const uint32 */*s*/, uint32 */*d*/); |
112 | |
113 | /*----- That's all, folks -------------------------------------------------*/ |
114 | |
115 | #ifdef __cplusplus |
116 | } |
117 | #endif |
118 | |
119 | #endif |