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2e8eb64a | 1 | /* -*-c-*- |
2 | * | |
2e8eb64a | 3 | * The Rijndael block cipher, 256-bit version |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
2e8eb64a | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
2e8eb64a | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
2e8eb64a | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
2e8eb64a | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
30 | #include <assert.h> | |
31 | #include <stdio.h> | |
32 | ||
33 | #include <mLib/bits.h> | |
34 | ||
416b8869 MW |
35 | #if defined(TEST_RIG) && defined(ENABLE_ASM_DEBUG) |
36 | # include "regdump.h" | |
37 | # define BLKC_TESTHOOK do { regdump_init(); } while (0) | |
38 | #endif | |
39 | ||
2e8eb64a | 40 | #include "blkc.h" |
41 | #include "gcipher.h" | |
42 | #include "rijndael.h" | |
43 | #include "rijndael256.h" | |
44 | #include "rijndael-base.h" | |
45 | ||
46 | /*----- Main code ---------------------------------------------------------*/ | |
47 | ||
48 | /* --- @rijndael256_init@ --- * | |
49 | * | |
50 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize | |
51 | * @const void *buf@ = pointer to buffer of key material | |
52 | * @size_t sz@ = size of the key material | |
53 | * | |
54 | * Returns: --- | |
55 | * | |
56 | * Use: Initializes a Rijndael context with a particular key. This | |
57 | * implementation of Rijndael doesn't impose any particular | |
58 | * limits on the key size except that it must be multiple of 4 | |
59 | * bytes long. 256 bits seems sensible, though. | |
60 | */ | |
61 | ||
62 | void rijndael256_init(rijndael_ctx *k, const void *buf, size_t sz) | |
63 | { | |
64 | rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz); | |
65 | } | |
66 | ||
67 | /* --- @rijndael256_eblk@, @rijndael256_dblk@ --- * | |
68 | * | |
69 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context | |
70 | * @const uint32 s[4]@ = pointer to source block | |
71 | * @uint32 d[4]@ = pointer to destination block | |
72 | * | |
73 | * Returns: --- | |
74 | * | |
75 | * Use: Low-level block encryption and decryption. | |
76 | */ | |
77 | ||
78 | #define DO(what, t, \ | |
79 | aa, bb, cc, dd, ee, ff, gg, hh, \ | |
80 | a, b, c, d, e, f, g, h, w) do { \ | |
81 | aa = what(t, a, b, d, e) ^ *w++; \ | |
82 | bb = what(t, b, c, e, f) ^ *w++; \ | |
83 | cc = what(t, c, d, f, g) ^ *w++; \ | |
84 | dd = what(t, d, e, g, h) ^ *w++; \ | |
85 | ee = what(t, e, f, h, a) ^ *w++; \ | |
86 | ff = what(t, f, g, a, b) ^ *w++; \ | |
87 | gg = what(t, g, h, b, c) ^ *w++; \ | |
88 | hh = what(t, h, a, c, d) ^ *w++; \ | |
89 | } while (0) | |
90 | ||
91 | #define UNDO(what, t, \ | |
92 | aa, bb, cc, dd, ee, ff, gg, hh, \ | |
93 | a, b, c, d, e, f, g, h, w) do { \ | |
94 | aa = what(t, a, h, f, e) ^ *w++; \ | |
95 | bb = what(t, b, a, g, f) ^ *w++; \ | |
96 | cc = what(t, c, b, h, g) ^ *w++; \ | |
97 | dd = what(t, d, c, a, h) ^ *w++; \ | |
98 | ee = what(t, e, d, b, a) ^ *w++; \ | |
99 | ff = what(t, f, e, c, b) ^ *w++; \ | |
100 | gg = what(t, g, f, d, c) ^ *w++; \ | |
101 | hh = what(t, h, g, e, d) ^ *w++; \ | |
102 | } while (0) | |
103 | ||
104 | void rijndael256_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) | |
105 | { | |
106 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; | |
107 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; | |
108 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; | |
78ec50fa | 109 | const uint32 *w = k->w; |
2e8eb64a | 110 | |
111 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; | |
112 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; | |
113 | ||
114 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
115 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
116 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
117 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
118 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
119 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
120 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
121 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
122 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
123 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
124 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
125 | DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
126 | DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
127 | DO(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
128 | ||
129 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; | |
130 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; | |
131 | } | |
132 | ||
133 | void rijndael256_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst) | |
134 | { | |
135 | uint32 a = s[0], b = s[1], c = s[2], d = s[3]; | |
136 | uint32 e = s[4], f = s[5], g = s[6], h = s[7]; | |
137 | uint32 aa, bb, cc, dd, ee, ff, gg, hh; | |
78ec50fa | 138 | const uint32 *w = k->wi; |
2e8eb64a | 139 | |
140 | a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; | |
141 | e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++; | |
142 | ||
143 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
144 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
145 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
146 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
147 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
148 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
149 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
150 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
151 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
152 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
153 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
154 | UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
155 | UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w); | |
156 | UNDO(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w); | |
157 | ||
158 | dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; | |
159 | dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h; | |
160 | } | |
161 | ||
162 | BLKC_TEST(RIJNDAEL256, rijndael256) | |
163 | ||
164 | /*----- That's all, folks -------------------------------------------------*/ |