3 * The Rijndael block cipher
5 * (c) 2000 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 ------------------------------------------------------*/
35 #include <mLib/bits.h>
41 #include "rijndael-base.h"
43 /*----- Main code ---------------------------------------------------------*/
45 /* --- @rijndael_init@ --- *
47 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
48 * @const void *buf@ = pointer to buffer of key material
49 * @size_t sz@ = size of the key material
53 * Use: Initializes a Rijndael context with a particular key. This
54 * implementation of Rijndael doesn't impose any particular
55 * limits on the key size except that it must be multiple of 4
56 * bytes long. 256 bits seems sensible, though.
59 void rijndael_init(rijndael_ctx *k, const void *buf, size_t sz)
61 rijndael_setup(k, RIJNDAEL_BLKSZ / 4, buf, sz);
64 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
66 * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
67 * @const uint32 s[4]@ = pointer to source block
68 * @uint32 d[4]@ = pointer to destination block
72 * Use: Low-level block encryption and decryption.
75 CPU_DISPATCH(EMPTY, EMPTY, void, rijndael_eblk, (const rijndael_ctx *k,
78 (k, s, d), pick_eblk, simple_eblk)
80 CPU_DISPATCH(EMPTY, EMPTY, void, rijndael_dblk, (const rijndael_ctx *k,
83 (k, s, d), pick_dblk, simple_dblk)
85 #if CPUFAM_X86 || CPUFAM_AMD64
86 extern rijndael_eblk__functype rijndael_eblk_x86ish_aesni;
87 extern rijndael_dblk__functype rijndael_dblk_x86ish_aesni;
90 static rijndael_eblk__functype *pick_eblk(void)
92 #if CPUFAM_X86 || CPUFAM_AMD64
93 DISPATCH_PICK_COND(rijndael_eblk, rijndael_eblk_x86ish_aesni,
94 cpu_feature_p(CPUFEAT_X86_AESNI));
96 DISPATCH_PICK_FALLBACK(rijndael_eblk, simple_eblk);
99 static rijndael_dblk__functype *pick_dblk(void)
101 #if CPUFAM_X86 || CPUFAM_AMD64
102 DISPATCH_PICK_COND(rijndael_dblk, rijndael_dblk_x86ish_aesni,
103 cpu_feature_p(CPUFEAT_X86_AESNI));
105 DISPATCH_PICK_FALLBACK(rijndael_dblk, simple_dblk);
108 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
109 aa = what(t, a, b, c, d) ^ *w++; \
110 bb = what(t, b, c, d, a) ^ *w++; \
111 cc = what(t, c, d, a, b) ^ *w++; \
112 dd = what(t, d, a, b, c) ^ *w++; \
115 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
116 aa = what(t, a, d, c, b) ^ *w++; \
117 bb = what(t, b, a, d, c) ^ *w++; \
118 cc = what(t, c, b, a, d) ^ *w++; \
119 dd = what(t, d, c, b, a) ^ *w++; \
122 static void simple_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
124 uint32 a = s[0], b = s[1], c = s[2], d = s[3];
125 uint32 aa, bb, cc, dd;
126 const uint32 *w = k->w;
128 a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
129 aa = a; bb = b; cc = c; dd = d;
133 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
135 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
137 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
139 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
142 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
143 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
144 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
145 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
146 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
147 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
148 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
149 DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
150 DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
152 DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w);
154 dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
157 static void simple_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
159 uint32 a = s[0], b = s[1], c = s[2], d = s[3];
160 uint32 aa, bb, cc, dd;
161 const uint32 *w = k->wi;
163 a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
164 aa = a; bb = b; cc = c; dd = d;
168 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
170 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
172 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
174 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
177 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
178 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
179 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
180 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
181 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
182 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
183 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
184 UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
185 UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
187 UNDO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w);
189 dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
192 BLKC_TEST(RIJNDAEL, rijndael)
194 /*----- That's all, folks -------------------------------------------------*/