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
)
86 extern rijndael_eblk__functype rijndael_eblk_x86_aesni
;
87 extern rijndael_dblk__functype rijndael_dblk_x86_aesni
;
90 static rijndael_eblk__functype
*pick_eblk(void)
93 if (cpu_feature_p(CPUFEAT_X86_AESNI
)) return rijndael_eblk_x86_aesni
;
98 static rijndael_dblk__functype
*pick_dblk(void)
101 if (cpu_feature_p(CPUFEAT_X86_AESNI
)) return rijndael_dblk_x86_aesni
;
106 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
107 aa = what(t, a, b, c, d) ^ *w++; \
108 bb = what(t, b, c, d, a) ^ *w++; \
109 cc = what(t, c, d, a, b) ^ *w++; \
110 dd = what(t, d, a, b, c) ^ *w++; \
113 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
114 aa = what(t, a, d, c, b) ^ *w++; \
115 bb = what(t, b, a, d, c) ^ *w++; \
116 cc = what(t, c, b, a, d) ^ *w++; \
117 dd = what(t, d, c, b, a) ^ *w++; \
120 static void simple_eblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
122 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
123 uint32 aa
, bb
, cc
, dd
;
124 const uint32
*w
= k
->w
;
126 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
127 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
131 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
133 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
135 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
137 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
140 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
141 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
);
150 DO(SUB
, S
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
152 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
155 static void simple_dblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
157 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
158 uint32 aa
, bb
, cc
, dd
;
159 const uint32
*w
= k
->wi
;
161 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
162 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
166 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
168 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
170 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
172 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
175 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
176 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
);
185 UNDO(SUB
, SI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
187 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
190 BLKC_TEST(RIJNDAEL
, rijndael
)
192 /*----- That's all, folks -------------------------------------------------*/