3 * $Id: gfshare-mktab.c,v 1.2 2000/06/18 23:12:15 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 /*----- Revision history --------------------------------------------------*
32 * $Log: gfshare-mktab.c,v $
33 * Revision 1.2 2000/06/18 23:12:15 mdw
34 * Change typesetting of Galois Field names.
36 * Revision 1.1 2000/06/17 10:56:30 mdw
37 * Fast but nonstandard secret sharing system.
41 /*----- Header files ------------------------------------------------------*/
46 #include <mLib/bits.h>
48 /*----- Magic numbers -----------------------------------------------------*/
52 /*----- Main code ---------------------------------------------------------*/
54 int main(int argc
, char *argv
[])
56 octet log
[256], alog
[256];
61 for (i
= 0; i
< 255; i
++) {
74 * Log tables for secret sharing in %$\gf{2^8}$% [generated]\n\
77 #ifndef GFSHARE_TAB_H\n\
78 #define GFSHARE_TAB_H\n\
80 #define GFSHARE_LOG { \\\n\
83 for (i
= 0; i
< 256; i
++) {
84 printf("0x%02x", log
[i
]);
88 fputs(", \\\n ", stdout
);
94 #define GFSHARE_EXP { \\\n\
97 for (i
= 0; i
< 510; i
++) {
98 printf("0x%02x", alog
[i
% 255]);
102 fputs(", \\\n ", stdout
);
109 fputs("#endif\n", stdout
);
111 if (fclose(stdout
)) {
112 fprintf(stderr
, "error writing data\n");
119 /*----- That's all, folks -------------------------------------------------*/