3 * $Id: rijndael-base.c,v 1.1 2001/05/07 17:31:37 mdw Exp $
5 * Low-level stuff for all Rijndael block sizes
7 * (c) 2001 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-base.c,v $
33 * Revision 1.1 2001/05/07 17:31:37 mdw
34 * Centralize Rijndael tables and key scheduling.
38 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
48 #include "rijndael-base.h"
49 #include "rijndael-tab.h"
51 /*----- Global variables --------------------------------------------------*/
53 const octet rijndael_keysz
[] = { KSZ_RANGE
, RIJNDAEL_KEYSZ
, 4, 32, 4 };
55 /*----- Constant tables ---------------------------------------------------*/
57 const octet rijndael_s
[256] = RIJNDAEL_S
;
58 const octet rijndael_si
[256] = RIJNDAEL_SI
;
59 const uint32 rijndael_t
[4][256] = RIJNDAEL_T
;
60 const uint32 rijndael_ti
[4][256] = RIJNDAEL_TI
;
61 const uint32 rijndael_u
[4][256] = RIJNDAEL_U
;
62 const octet rijndael_rcon
[] = RIJNDAEL_RCON
;
64 /*----- Main code ---------------------------------------------------------*/
66 /* --- @rijndael_setup@ --- *
68 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
69 * @unsigned nb@ = number of words in the block
70 * @const void *buf@ = pointer to buffer of key material
71 * @size_t sz@ = size of the key material
75 * Use: Low-level key-scheduling.
78 void rijndael_setup(rijndael_ctx
*k
, unsigned nb
, const void *buf
, size_t sz
)
85 /* --- Sort out the key size --- */
87 KSZ_ASSERT(rijndael
, sz
);
90 /* --- Select the number of rounds --- */
92 nr
= (nk
> nb ? nk
: nb
) + 6;
97 /* --- Fetch the first key words out --- */
100 for (i
= 0; i
< nk
; i
++) {
101 k
->w
[i
] = LOAD32_L(p
);
105 /* --- Expand this material to fill the rest of the table --- */
110 for (; i
< nw
; i
++) {
111 uint32 w
= k
->w
[i
- nk
];
114 w
^= SUB(S
, ww
, ww
, ww
, ww
) ^ *p
++;
115 } else if (nk
> 6 && i
% nk
== 4)
116 w
^= SUB(S
, ww
, ww
, ww
, ww
);
122 /* --- Make the decryption keys --- */
128 k
->wi
[i
] = k
->w
[j
+ jj
++];
130 for (; i
< nw
- nb
; i
+= nb
) {
132 for (jj
= 0; jj
< nb
; jj
++) {
133 uint32 w
= k
->w
[j
+ jj
];
134 k
->wi
[i
+ jj
] = MIX(U
, w
, w
, w
, w
);
140 k
->wi
[i
] = k
->w
[j
+ jj
++];
143 /*----- That's all, folks -------------------------------------------------*/