3 * $Id: gfshare-mktab.c,v 1.3 2000/06/18 23:26:09 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 1.3 2000/06/18 23:26:09 mdw
36 * Revision 1.2 2000/06/18 23:12:15 mdw
37 * Change typesetting of Galois Field names.
39 * Revision 1.1 2000/06/17 10:56:30 mdw
40 * Fast but nonstandard secret sharing system.
44 /*----- Header files ------------------------------------------------------*/
49 #include <mLib/bits.h>
51 /*----- Magic numbers -----------------------------------------------------*/
55 /*----- Main code ---------------------------------------------------------*/
57 int main(int argc
, char *argv
[])
59 octet log
[256], alog
[256];
64 for (i
= 0; i
< 255; i
++) {
77 * Log tables for secret sharing in %$\\gf{2^8}$% [generated]\n\
80 #ifndef GFSHARE_TAB_H\n\
81 #define GFSHARE_TAB_H\n\
83 #define GFSHARE_LOG { \\\n\
86 for (i
= 0; i
< 256; i
++) {
87 printf("0x%02x", log
[i
]);
91 fputs(", \\\n ", stdout
);
97 #define GFSHARE_EXP { \\\n\
100 for (i
= 0; i
< 510; i
++) {
101 printf("0x%02x", alog
[i
% 255]);
105 fputs(", \\\n ", stdout
);
112 fputs("#endif\n", stdout
);
114 if (fclose(stdout
)) {
115 fprintf(stderr
, "error writing data\n");
122 /*----- That's all, folks -------------------------------------------------*/