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 -------------------------------------------------*/