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 ------------------------------------------------------*/
33 #include <mLib/bits.h>
38 #include "rijndael-base.h"
40 /*----- Main code ---------------------------------------------------------*/
42 /* --- @rijndael_init@ --- *
44 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
45 * @const void *buf@ = pointer to buffer of key material
46 * @size_t sz@ = size of the key material
50 * Use: Initializes a Rijndael context with a particular key. This
51 * implementation of Rijndael doesn't impose any particular
52 * limits on the key size except that it must be multiple of 4
53 * bytes long. 256 bits seems sensible, though.
56 void rijndael_init(rijndael_ctx
*k
, const void *buf
, size_t sz
)
58 rijndael_setup(k
, RIJNDAEL_BLKSZ
/ 4, buf
, sz
);
61 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
63 * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
64 * @const uint32 s[4]@ = pointer to source block
65 * @uint32 d[4]@ = pointer to destination block
69 * Use: Low-level block encryption and decryption.
72 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
73 aa = what(t, a, b, c, d) ^ *w++; \
74 bb = what(t, b, c, d, a) ^ *w++; \
75 cc = what(t, c, d, a, b) ^ *w++; \
76 dd = what(t, d, a, b, c) ^ *w++; \
79 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
80 aa = what(t, a, d, c, b) ^ *w++; \
81 bb = what(t, b, a, d, c) ^ *w++; \
82 cc = what(t, c, b, a, d) ^ *w++; \
83 dd = what(t, d, c, b, a) ^ *w++; \
86 void rijndael_eblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
88 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
89 uint32 aa
, bb
, cc
, dd
;
90 const uint32
*w
= k
->w
;
92 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
93 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
97 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
99 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
101 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
103 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
106 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
107 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
108 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
109 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
110 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
111 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
112 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
113 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
114 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
116 DO(SUB
, S
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
118 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
121 void rijndael_dblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
123 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
124 uint32 aa
, bb
, cc
, dd
;
125 const uint32
*w
= k
->wi
;
127 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
128 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
132 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
134 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
136 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
138 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
141 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
142 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
143 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
144 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
145 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
146 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
147 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
148 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
149 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
151 UNDO(SUB
, SI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
153 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
156 BLKC_TEST(RIJNDAEL
, rijndael
)
158 /*----- That's all, folks -------------------------------------------------*/