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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rijndael.c,v 1.4 2001/05/07 17:31:53 mdw Exp $ |
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4 | * |
5 | * The Rijndael 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: rijndael.c,v $ |
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33 | * Revision 1.4 2001/05/07 17:31:53 mdw |
34 | * Separate out key scheduling. |
35 | * |
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36 | * Revision 1.3 2001/05/07 15:44:46 mdw |
37 | * Fix unusual numbers of rounds. Simplify implementation. |
38 | * |
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39 | * Revision 1.2 2000/12/06 20:32:59 mdw |
40 | * Fix round count for weird key sizes. |
41 | * |
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42 | * Revision 1.1 2000/06/17 11:56:07 mdw |
43 | * New cipher. |
44 | * |
45 | */ |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <assert.h> |
50 | #include <stdio.h> |
51 | |
52 | #include <mLib/bits.h> |
53 | |
54 | #include "blkc.h" |
55 | #include "gcipher.h" |
56 | #include "rijndael.h" |
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57 | #include "rijndael-base.h" |
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58 | |
59 | /*----- Main code ---------------------------------------------------------*/ |
60 | |
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61 | /* --- @rijndael_init@ --- * |
62 | * |
63 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
64 | * @const void *buf@ = pointer to buffer of key material |
65 | * @size_t sz@ = size of the key material |
66 | * |
67 | * Returns: --- |
68 | * |
69 | * Use: Initializes a Rijndael context with a particular key. This |
70 | * implementation of Rijndael doesn't impose any particular |
71 | * limits on the key size except that it must be multiple of 4 |
72 | * bytes long. 256 bits seems sensible, though. |
73 | */ |
74 | |
75 | void rijndael_init(rijndael_ctx *k, const void *buf, size_t sz) |
76 | { |
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77 | rijndael_setup(k, RIJNDAEL_BLKSZ / 4, buf, sz); |
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78 | } |
79 | |
80 | /* --- @rijndael_eblk@, @rijndael_dblk@ --- * |
81 | * |
82 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
83 | * @const uint32 s[4]@ = pointer to source block |
84 | * @uint32 d[4]@ = pointer to destination block |
85 | * |
86 | * Returns: --- |
87 | * |
88 | * Use: Low-level block encryption and decryption. |
89 | */ |
90 | |
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91 | #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
92 | aa = what(t, a, b, c, d) ^ *w++; \ |
93 | bb = what(t, b, c, d, a) ^ *w++; \ |
94 | cc = what(t, c, d, a, b) ^ *w++; \ |
95 | dd = what(t, d, a, b, c) ^ *w++; \ |
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96 | } while (0) |
97 | |
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98 | #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
99 | aa = what(t, a, d, c, b) ^ *w++; \ |
100 | bb = what(t, b, a, d, c) ^ *w++; \ |
101 | cc = what(t, c, b, a, d) ^ *w++; \ |
102 | dd = what(t, d, c, b, a) ^ *w++; \ |
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103 | } while (0) |
104 | |
105 | void rijndael_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
106 | { |
107 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
108 | uint32 aa, bb, cc, dd; |
109 | uint32 *w = k->w; |
110 | |
111 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
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112 | aa = a; bb = b; cc = c; dd = d; |
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113 | |
114 | switch (k->nr) { |
115 | case 14: |
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116 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
117 | case 13: |
118 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
3a65506d |
119 | case 12: |
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120 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
121 | case 11: |
122 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
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123 | case 10: |
124 | default: |
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125 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
126 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
127 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
128 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
129 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
130 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
131 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
132 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
133 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
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134 | } |
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135 | DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w); |
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136 | |
137 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
138 | } |
139 | |
140 | void rijndael_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
141 | { |
142 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
143 | uint32 aa, bb, cc, dd; |
144 | uint32 *w = k->wi; |
145 | |
146 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
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147 | aa = a; bb = b; cc = c; dd = d; |
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148 | |
149 | switch (k->nr) { |
150 | case 14: |
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151 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
152 | case 13: |
153 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
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154 | case 12: |
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155 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
156 | case 11: |
157 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
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158 | case 10: |
159 | default: |
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160 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
161 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
162 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
163 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
164 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
165 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
166 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
167 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
168 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
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169 | } |
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170 | UNDO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w); |
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171 | |
172 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
173 | } |
174 | |
175 | BLKC_TEST(RIJNDAEL, rijndael) |
176 | |
177 | /*----- That's all, folks -------------------------------------------------*/ |