3 * The Rijndael block cipher, 256-bit version
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
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.
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.
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,
28 /*----- Header files ------------------------------------------------------*/
33 #include <mLib/bits.h>
38 #include "rijndael256.h"
39 #include "rijndael-base.h"
41 /*----- Main code ---------------------------------------------------------*/
43 /* --- @rijndael256_init@ --- *
45 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
46 * @const void *buf@ = pointer to buffer of key material
47 * @size_t sz@ = size of the key material
51 * Use: Initializes a Rijndael context with a particular key. This
52 * implementation of Rijndael doesn't impose any particular
53 * limits on the key size except that it must be multiple of 4
54 * bytes long. 256 bits seems sensible, though.
57 void rijndael256_init(rijndael_ctx *k, const void *buf, size_t sz)
59 rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz);
62 /* --- @rijndael256_eblk@, @rijndael256_dblk@ --- *
64 * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
65 * @const uint32 s[4]@ = pointer to source block
66 * @uint32 d[4]@ = pointer to destination block
70 * Use: Low-level block encryption and decryption.
74 aa, bb, cc, dd, ee, ff, gg, hh, \
75 a, b, c, d, e, f, g, h, w) do { \
76 aa = what(t, a, b, d, e) ^ *w++; \
77 bb = what(t, b, c, e, f) ^ *w++; \
78 cc = what(t, c, d, f, g) ^ *w++; \
79 dd = what(t, d, e, g, h) ^ *w++; \
80 ee = what(t, e, f, h, a) ^ *w++; \
81 ff = what(t, f, g, a, b) ^ *w++; \
82 gg = what(t, g, h, b, c) ^ *w++; \
83 hh = what(t, h, a, c, d) ^ *w++; \
86 #define UNDO(what, t, \
87 aa, bb, cc, dd, ee, ff, gg, hh, \
88 a, b, c, d, e, f, g, h, w) do { \
89 aa = what(t, a, h, f, e) ^ *w++; \
90 bb = what(t, b, a, g, f) ^ *w++; \
91 cc = what(t, c, b, h, g) ^ *w++; \
92 dd = what(t, d, c, a, h) ^ *w++; \
93 ee = what(t, e, d, b, a) ^ *w++; \
94 ff = what(t, f, e, c, b) ^ *w++; \
95 gg = what(t, g, f, d, c) ^ *w++; \
96 hh = what(t, h, g, e, d) ^ *w++; \
99 void rijndael256_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
101 uint32 a = s[0], b = s[1], c = s[2], d = s[3];
102 uint32 e = s[4], f = s[5], g = s[6], h = s[7];
103 uint32 aa, bb, cc, dd, ee, ff, gg, hh;
104 const uint32 *w = k->w;
106 a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
107 e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++;
109 DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
110 DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
111 DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
112 DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
113 DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
114 DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
115 DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
116 DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
117 DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
118 DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
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(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
124 dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
125 dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
128 void rijndael256_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
130 uint32 a = s[0], b = s[1], c = s[2], d = s[3];
131 uint32 e = s[4], f = s[5], g = s[6], h = s[7];
132 uint32 aa, bb, cc, dd, ee, ff, gg, hh;
133 const uint32 *w = k->wi;
135 a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
136 e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++;
138 UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
139 UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
140 UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
141 UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
142 UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
143 UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
144 UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
145 UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
146 UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
147 UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
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(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
153 dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
154 dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
157 BLKC_TEST(RIJNDAEL256, rijndael256)
159 /*----- That's all, folks -------------------------------------------------*/