3 * $Id: rijndael.c,v 1.4 2001/05/07 17:31:53 mdw Exp $
5 * The Rijndael block cipher
7 * (c) 2000 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: rijndael.c,v $
33 * Revision 1.4 2001/05/07 17:31:53 mdw
34 * Separate out key scheduling.
36 * Revision 1.3 2001/05/07 15:44:46 mdw
37 * Fix unusual numbers of rounds. Simplify implementation.
39 * Revision 1.2 2000/12/06 20:32:59 mdw
40 * Fix round count for weird key sizes.
42 * Revision 1.1 2000/06/17 11:56:07 mdw
47 /*----- Header files ------------------------------------------------------*/
52 #include <mLib/bits.h>
57 #include "rijndael-base.h"
59 /*----- Main code ---------------------------------------------------------*/
61 /* --- @rijndael_init@ --- *
63 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
64 * @const void *buf@ = pointer to buffer of key material
65 * @size_t sz@ = size of the key material
69 * Use: Initializes a Rijndael context with a particular key. This
70 * implementation of Rijndael doesn't impose any particular
71 * limits on the key size except that it must be multiple of 4
72 * bytes long. 256 bits seems sensible, though.
75 void rijndael_init(rijndael_ctx
*k
, const void *buf
, size_t sz
)
77 rijndael_setup(k
, RIJNDAEL_BLKSZ
/ 4, buf
, sz
);
80 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
82 * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
83 * @const uint32 s[4]@ = pointer to source block
84 * @uint32 d[4]@ = pointer to destination block
88 * Use: Low-level block encryption and decryption.
91 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
92 aa = what(t, a, b, c, d) ^ *w++; \
93 bb = what(t, b, c, d, a) ^ *w++; \
94 cc = what(t, c, d, a, b) ^ *w++; \
95 dd = what(t, d, a, b, c) ^ *w++; \
98 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
99 aa = what(t, a, d, c, b) ^ *w++; \
100 bb = what(t, b, a, d, c) ^ *w++; \
101 cc = what(t, c, b, a, d) ^ *w++; \
102 dd = what(t, d, c, b, a) ^ *w++; \
105 void rijndael_eblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
107 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
108 uint32 aa
, bb
, cc
, dd
;
111 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
112 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
116 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
118 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
120 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
122 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
125 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
126 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
127 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
128 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
129 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
130 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
131 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
132 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
133 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
135 DO(SUB
, S
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
137 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
140 void rijndael_dblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
142 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
143 uint32 aa
, bb
, cc
, dd
;
146 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
147 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
151 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
153 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
155 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
157 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
160 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
161 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
162 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
163 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
164 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
165 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
166 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
167 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
168 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
170 UNDO(SUB
, SI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
172 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
175 BLKC_TEST(RIJNDAEL
, rijndael
)
177 /*----- That's all, folks -------------------------------------------------*/