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1 | /* -*-c-*- |
2 | * |
3 | * $Id: square.h,v 1.1 2000/07/15 20:51:58 mdw Exp $ |
4 | * |
5 | * The Square block cipher |
6 | * |
7 | * (c) 2000 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: square.h,v $ |
33 | * Revision 1.1 2000/07/15 20:51:58 mdw |
34 | * New block cipher. |
35 | * |
36 | * Revision 1.1 2000/06/17 11:56:07 mdw |
37 | * New cipher. |
38 | * |
39 | */ |
40 | |
41 | /*----- Notes on the Square block cipher ----------------------------------* |
42 | * |
43 | * Invented by Joan Daemen and Vincent Rijmen, Square is a fast and |
44 | * relatively simple 128-bit block cipher. It is the predecessor to |
45 | * Rijndael. I have grave doubts about the security of Square, though: a |
46 | * dedicated attack against Square's structure by Knudsen has been extended |
47 | * by the Twofish team against Rijndael, and I believe that this extended |
48 | * attack is also effective against Square. This is a shame: the structure |
49 | * of Square (and Rijndael) is extremely elegant, and has some extremely nice |
50 | * properties. |
51 | */ |
52 | |
53 | #ifndef CATACOMB_SQUARE_H |
54 | #define CATACOMB_SQUARE_H |
55 | |
56 | #ifdef __cplusplus |
57 | extern "C" { |
58 | #endif |
59 | |
60 | /*----- Header files ------------------------------------------------------*/ |
61 | |
62 | #include <stddef.h> |
63 | |
64 | #include <mLib/bits.h> |
65 | |
66 | /*----- Magical numbers ---------------------------------------------------*/ |
67 | |
68 | #define SQUARE_BLKSZ 16 |
69 | #define SQUARE_KEYSZ 16 |
70 | #define SQUARE_CLASS (N, L, 128) |
71 | |
72 | extern const octet square_keysz[]; |
73 | |
74 | /*----- Data structures ---------------------------------------------------*/ |
75 | |
76 | #define SQUARE_MAXROUNDS 8 |
77 | #define SQUARE_KWORDS ((SQUARE_MAXROUNDS + 1) * (SQUARE_BLKSZ / 4)) |
78 | |
79 | typedef struct square_ctx { |
80 | uint32 w[SQUARE_KWORDS]; |
81 | uint32 wi[SQUARE_KWORDS]; |
82 | } square_ctx; |
83 | |
84 | /*----- Functions provided ------------------------------------------------*/ |
85 | |
86 | /* --- @square_init@ --- * |
87 | * |
88 | * Arguments: @square_ctx *k@ = pointer to context to initialize |
89 | * @const void *buf@ = pointer to buffer of key material |
90 | * @size_t sz@ = size of the key material |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: Initializes a Square context with a particular key. This |
95 | * implementation of Square doesn't impose any particular |
96 | * limits on the key size except that it must be multiple of 4 |
97 | * bytes long. 256 bits seems sensible, though. |
98 | */ |
99 | |
100 | extern void square_init(square_ctx */*k*/, |
101 | const void */*buf*/, size_t /*sz*/); |
102 | |
103 | /* --- @square_eblk@, @square_dblk@ --- * |
104 | * |
105 | * Arguments: @const square_ctx *k@ = pointer to Square context |
106 | * @const uint32 s[4]@ = pointer to source block |
107 | * @uint32 d[4]@ = pointer to destination block |
108 | * |
109 | * Returns: --- |
110 | * |
111 | * Use: Low-level block encryption and decryption. |
112 | */ |
113 | |
114 | extern void square_eblk(const square_ctx */*k*/, |
115 | const uint32 */*s*/, uint32 */*dst*/); |
116 | extern void square_dblk(const square_ctx */*k*/, |
117 | const uint32 */*s*/, uint32 */*dst*/); |
118 | |
119 | /*----- That's all, folks -------------------------------------------------*/ |
120 | |
121 | #ifdef __cplusplus |
122 | } |
123 | #endif |
124 | |
125 | #endif |