3 * $Id: rijndael.c,v 1.5 2004/04/08 01:36:15 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 /*----- Header files ------------------------------------------------------*/
35 #include <mLib/bits.h>
40 #include "rijndael-base.h"
42 /*----- Main code ---------------------------------------------------------*/
44 /* --- @rijndael_init@ --- *
46 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
47 * @const void *buf@ = pointer to buffer of key material
48 * @size_t sz@ = size of the key material
52 * Use: Initializes a Rijndael context with a particular key. This
53 * implementation of Rijndael doesn't impose any particular
54 * limits on the key size except that it must be multiple of 4
55 * bytes long. 256 bits seems sensible, though.
58 void rijndael_init(rijndael_ctx
*k
, const void *buf
, size_t sz
)
60 rijndael_setup(k
, RIJNDAEL_BLKSZ
/ 4, buf
, sz
);
63 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
65 * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
66 * @const uint32 s[4]@ = pointer to source block
67 * @uint32 d[4]@ = pointer to destination block
71 * Use: Low-level block encryption and decryption.
74 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
75 aa = what(t, a, b, c, d) ^ *w++; \
76 bb = what(t, b, c, d, a) ^ *w++; \
77 cc = what(t, c, d, a, b) ^ *w++; \
78 dd = what(t, d, a, b, c) ^ *w++; \
81 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do { \
82 aa = what(t, a, d, c, b) ^ *w++; \
83 bb = what(t, b, a, d, c) ^ *w++; \
84 cc = what(t, c, b, a, d) ^ *w++; \
85 dd = what(t, d, c, b, a) ^ *w++; \
88 void rijndael_eblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
90 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
91 uint32 aa
, bb
, cc
, dd
;
94 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
95 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
99 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
101 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
103 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
105 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
);
115 DO(MIX
, T
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
116 DO(MIX
, T
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
118 DO(SUB
, S
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
120 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
123 void rijndael_dblk(const rijndael_ctx
*k
, const uint32
*s
, uint32
*dst
)
125 uint32 a
= s
[0], b
= s
[1], c
= s
[2], d
= s
[3];
126 uint32 aa
, bb
, cc
, dd
;
129 a
^= *w
++; b
^= *w
++; c
^= *w
++; d
^= *w
++;
130 aa
= a
; bb
= b
; cc
= c
; dd
= d
;
134 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
136 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
138 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
140 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
);
150 UNDO(MIX
, TI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
151 UNDO(MIX
, TI
, aa
, bb
, cc
, dd
, a
, b
, c
, d
, w
);
153 UNDO(SUB
, SI
, a
, b
, c
, d
, aa
, bb
, cc
, dd
, w
);
155 dst
[0] = a
; dst
[1] = b
; dst
[2] = c
; dst
[3] = d
;
158 BLKC_TEST(RIJNDAEL
, rijndael
)
160 /*----- That's all, folks -------------------------------------------------*/