3 * $Id: gfshare-mktab.c,v 1.4 2004/04/08 01:36:15 mdw Exp $
5 * Generate tables for %$\gf{2^8}$% multiplication
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>
37 /*----- Magic numbers -----------------------------------------------------*/
41 /*----- Main code ---------------------------------------------------------*/
43 int main(int argc, char *argv[])
45 octet log[256], alog[256];
50 for (i = 0; i < 255; i++) {
63 * Log tables for secret sharing in %$\\gf{2^8}$% [generated]\n\
66 #ifndef GFSHARE_TAB_H\n\
67 #define GFSHARE_TAB_H\n\
69 #define GFSHARE_LOG { \\\n\
72 for (i = 0; i < 256; i++) {
73 printf("0x%02x", log[i]);
77 fputs(", \\\n ", stdout);
83 #define GFSHARE_EXP { \\\n\
86 for (i = 0; i < 510; i++) {
87 printf("0x%02x", alog[i % 255]);
91 fputs(", \\\n ", stdout);
98 fputs("#endif\n", stdout);
100 if (fclose(stdout)) {
101 fprintf(stderr, "error writing data\n");
108 /*----- That's all, folks -------------------------------------------------*/