2e8eb64a |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: rijndael256.c,v 1.1 2001/05/07 17:32:03 mdw Exp $ |
4 | * |
5 | * The Rijndael block cipher, 256-bit version |
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: rijndael256.c,v $ |
33 | * Revision 1.1 2001/05/07 17:32:03 mdw |
34 | * New Rijndael block sizes. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <assert.h> |
41 | #include <stdio.h> |
42 | |
43 | #include <mLib/bits.h> |
44 | |
45 | #include "blkc.h" |
46 | #include "gcipher.h" |
47 | #include "rijndael.h" |
48 | #include "rijndael256.h" |
49 | #include "rijndael-base.h" |
50 | |
51 | /*----- Main code ---------------------------------------------------------*/ |
52 | |
53 | /* --- @rijndael256_init@ --- * |
54 | * |
55 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
56 | * @const void *buf@ = pointer to buffer of key material |
57 | * @size_t sz@ = size of the key material |
58 | * |
59 | * Returns: --- |
60 | * |
61 | * Use: Initializes a Rijndael context with a particular key. This |
62 | * implementation of Rijndael doesn't impose any particular |
63 | * limits on the key size except that it must be multiple of 4 |
64 | * bytes long. 256 bits seems sensible, though. |
65 | */ |
66 | |
67 | void rijndael256_init(rijndael_ctx *k, const void *buf, size_t sz) |
68 | { |
69 | rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz); |
70 | } |
71 | |
72 | /* --- @rijndael256_eblk@, @rijndael256_dblk@ --- * |
73 | * |
74 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
75 | * @const uint32 s[4]@ = pointer to source block |
76 | * @uint32 d[4]@ = pointer to destination block |
77 | * |
78 | * Returns: --- |
79 | * |
80 | * Use: Low-level block encryption and decryption. |
81 | */ |
82 | |
83 | #define DO(what, t, \ |
84 | aa, bb, cc, dd, ee, ff, gg, hh, \ |
85 | a, b, c, d, e, f, g, h, w) do { \ |
86 | aa = what(t, a, b, d, e) ^ *w++; \ |
87 | bb = what(t, b, c, e, f) ^ *w++; \ |
88 | cc = what(t, c, d, f, g) ^ *w++; \ |
89 | dd = what(t, d, e, g, h) ^ *w++; \ |
90 | ee = what(t, e, f, h, a) ^ *w++; \ |
91 | ff = what(t, f, g, a, b) ^ *w++; \ |
92 | gg = what(t, g, h, b, c) ^ *w++; \ |
93 | hh = what(t, h, a, c, d) ^ *w++; \ |
94 | } while (0) |
95 | |
96 | #define UNDO(what, t, \ |
97 | aa, bb, cc, dd, ee, ff, gg, hh, \ |
98 | a, b, c, d, e, f, g, h, w) do { \ |
99 | aa = what(t, a, h, f, e) ^ *w++; \ |
100 | bb = what(t, b, a, g, f) ^ *w++; \ |
101 | cc = what(t, c, b, h, g) ^ *w++; \ |
102 | dd = what(t, d, c, a, h) ^ *w++; \ |
103 | ee = what(t, e, d, b, a) ^ *w++; \ |
104 | ff = what(t, f, e, c, b) ^ *w++; \ |
105 | gg = what(t, g, f, d, c) ^ *w++; \ |
106 | hh = what(t, h, g, e, d) ^ *w++; \ |
107 | } while (0) |
108 | |
109 | void rijndael256_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
110 | { |
111 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
112 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; |
113 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; |
114 | uint32 *w = k->w; |
115 | |
116 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
117 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; |
118 | |
119 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
120 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
121 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
122 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
123 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
124 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
125 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
126 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
127 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
128 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
129 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
130 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
131 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
132 | DO(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
133 | |
134 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
135 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; |
136 | } |
137 | |
138 | void rijndael256_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
139 | { |
140 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
141 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; |
142 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; |
143 | uint32 *w = k->wi; |
144 | |
145 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
146 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; |
147 | |
148 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
149 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
150 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
151 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
152 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
153 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
154 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
155 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
156 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
157 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
158 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
159 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
160 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); |
161 | UNDO(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); |
162 | |
163 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
164 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; |
165 | } |
166 | |
167 | BLKC_TEST(RIJNDAEL256, rijndael256) |
168 | |
169 | /*----- That's all, folks -------------------------------------------------*/ |