3 * $Id: gfshare-mktab.c,v 1.1 2000/06/17 10:56:30 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 /*----- Revision history --------------------------------------------------*
32 * $Log: gfshare-mktab.c,v $
33 * Revision 1.1 2000/06/17 10:56:30 mdw
34 * Fast but nonstandard secret sharing system.
38 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
45 /*----- Magic numbers -----------------------------------------------------*/
49 /*----- Main code ---------------------------------------------------------*/
51 int main(int argc, char *argv[])
53 octet log[256], alog[256];
58 for (i = 0; i < 255; i++) {
71 * Log tables for secret sharing in %$\\gf(2^8)$% [generated]\n\
74 #ifndef GFSHARE_TAB_H\n\
75 #define GFSHARE_TAB_H\n\
77 #define GFSHARE_LOG { \\\n\
80 for (i = 0; i < 256; i++) {
81 printf("0x%02x", log[i]);
85 fputs(", \\\n ", stdout);
91 #define GFSHARE_EXP { \\\n\
94 for (i = 0; i < 510; i++) {
95 printf("0x%02x", alog[i % 255]);
99 fputs(", \\\n ", stdout);
106 fputs("#endif\n", stdout);
108 if (fclose(stdout)) {
109 fprintf(stderr, "error writing data\n");
116 /*----- That's all, folks -------------------------------------------------*/