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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rijndael.c,v 1.5 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The Rijndael block cipher |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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. |
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18 | * |
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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. |
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23 | * |
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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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <assert.h> |
33 | #include <stdio.h> |
34 | |
35 | #include <mLib/bits.h> |
36 | |
37 | #include "blkc.h" |
38 | #include "gcipher.h" |
39 | #include "rijndael.h" |
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40 | #include "rijndael-base.h" |
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41 | |
42 | /*----- Main code ---------------------------------------------------------*/ |
43 | |
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44 | /* --- @rijndael_init@ --- * |
45 | * |
46 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
47 | * @const void *buf@ = pointer to buffer of key material |
48 | * @size_t sz@ = size of the key material |
49 | * |
50 | * Returns: --- |
51 | * |
52 | * Use: Initializes a Rijndael context with a particular key. This |
53 | * implementation of Rijndael doesn't impose any particular |
54 | * limits on the key size except that it must be multiple of 4 |
55 | * bytes long. 256 bits seems sensible, though. |
56 | */ |
57 | |
58 | void rijndael_init(rijndael_ctx *k, const void *buf, size_t sz) |
59 | { |
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60 | rijndael_setup(k, RIJNDAEL_BLKSZ / 4, buf, sz); |
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61 | } |
62 | |
63 | /* --- @rijndael_eblk@, @rijndael_dblk@ --- * |
64 | * |
65 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
66 | * @const uint32 s[4]@ = pointer to source block |
67 | * @uint32 d[4]@ = pointer to destination block |
68 | * |
69 | * Returns: --- |
70 | * |
71 | * Use: Low-level block encryption and decryption. |
72 | */ |
73 | |
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74 | #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
75 | aa = what(t, a, b, c, d) ^ *w++; \ |
76 | bb = what(t, b, c, d, a) ^ *w++; \ |
77 | cc = what(t, c, d, a, b) ^ *w++; \ |
78 | dd = what(t, d, a, b, c) ^ *w++; \ |
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79 | } while (0) |
80 | |
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81 | #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \ |
82 | aa = what(t, a, d, c, b) ^ *w++; \ |
83 | bb = what(t, b, a, d, c) ^ *w++; \ |
84 | cc = what(t, c, b, a, d) ^ *w++; \ |
85 | dd = what(t, d, c, b, a) ^ *w++; \ |
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86 | } while (0) |
87 | |
88 | void rijndael_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
89 | { |
90 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
91 | uint32 aa, bb, cc, dd; |
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92 | const uint32 *w = k->w; |
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93 | |
94 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
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95 | aa = a; bb = b; cc = c; dd = d; |
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96 | |
97 | switch (k->nr) { |
98 | case 14: |
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99 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
100 | case 13: |
101 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
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102 | case 12: |
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103 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
104 | case 11: |
105 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
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106 | case 10: |
107 | default: |
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108 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
109 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
110 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
111 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
112 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
113 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
114 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
115 | DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w); |
116 | DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w); |
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117 | } |
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118 | DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w); |
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119 | |
120 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
121 | } |
122 | |
123 | void rijndael_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) |
124 | { |
125 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; |
126 | uint32 aa, bb, cc, dd; |
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127 | const uint32 *w = k->wi; |
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128 | |
129 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; |
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130 | aa = a; bb = b; cc = c; dd = d; |
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131 | |
132 | switch (k->nr) { |
133 | case 14: |
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134 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
135 | case 13: |
136 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
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137 | case 12: |
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138 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
139 | case 11: |
140 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
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141 | case 10: |
142 | default: |
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143 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
144 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
145 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
146 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
147 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
148 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
149 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
150 | UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w); |
151 | UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w); |
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152 | } |
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153 | UNDO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w); |
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154 | |
155 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; |
156 | } |
157 | |
158 | BLKC_TEST(RIJNDAEL, rijndael) |
159 | |
160 | /*----- That's all, folks -------------------------------------------------*/ |