3 * Low-level stuff for all Rijndael block sizes
5 * (c) 2001 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 /*----- Global variables --------------------------------------------------*/
42 const octet rijndael_keysz
[] = { KSZ_RANGE
, RIJNDAEL_KEYSZ
, 4, 32, 4 };
44 /*----- Main code ---------------------------------------------------------*/
46 /* --- @rijndael_setup@ --- *
48 * Arguments: @rijndael_ctx *k@ = pointer to context to initialize
49 * @unsigned nb@ = number of words in the block
50 * @const void *buf@ = pointer to buffer of key material
51 * @size_t sz@ = size of the key material
55 * Use: Low-level key-scheduling.
58 void rijndael_setup(rijndael_ctx
*k
, unsigned nb
, const void *buf
, size_t sz
)
65 /* --- Sort out the key size --- */
67 KSZ_ASSERT(rijndael
, sz
);
70 /* --- Select the number of rounds --- */
72 nr
= (nk
> nb ? nk
: nb
) + 6;
77 /* --- Fetch the first key words out --- */
80 for (i
= 0; i
< nk
; i
++) {
81 k
->w
[i
] = LOAD32_B(p
);
85 /* --- Expand this material to fill the rest of the table --- */
91 uint32 w
= k
->w
[i
- nk
];
94 w
^= SUB(S
, ww
, ww
, ww
, ww
) ^ (*p
++ << 24);
95 } else if (nk
> 6 && i
% nk
== 4)
96 w
^= SUB(S
, ww
, ww
, ww
, ww
);
102 /* --- Make the decryption keys --- */
108 k
->wi
[i
] = k
->w
[j
+ jj
++];
110 for (; i
< nw
- nb
; i
+= nb
) {
112 for (jj
= 0; jj
< nb
; jj
++) {
113 uint32 w
= k
->w
[j
+ jj
];
114 k
->wi
[i
+ jj
] = MIX(U
, w
, w
, w
, w
);
120 k
->wi
[i
] = k
->w
[j
+ jj
++];
123 /*----- That's all, folks -------------------------------------------------*/