+++ /dev/null
-/* -*-c-*-
- *
- * $Id: twofish-mktab.c,v 1.5 2004/04/08 01:36:15 mdw Exp $
- *
- * Build constant tables for Twofish
- *
- * (c) 2000 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <mLib/bits.h>
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct { octet t[4][16]; } t_tab;
-typedef struct { octet q[256]; } q_tab;
-
-/*----- Various Twofish tables --------------------------------------------*/
-
-/* --- The t-tables --- */
-
-static const t_tab qt0 = {{
- { 0x8, 0x1, 0x7, 0xd, 0x6, 0xf, 0x3, 0x2,
- 0x0, 0xb, 0x5, 0x9, 0xe, 0xc, 0xa, 0x4 },
- { 0xe, 0xc, 0xb, 0x8, 0x1, 0x2, 0x3, 0x5,
- 0xf, 0x4, 0xa, 0x6, 0x7, 0x0, 0x9, 0xd },
- { 0xb, 0xa, 0x5, 0xe, 0x6, 0xd, 0x9, 0x0,
- 0xc, 0x8, 0xf, 0x3, 0x2, 0x4, 0x7, 0x1 },
- { 0xd, 0x7, 0xf, 0x4, 0x1, 0x2, 0x6, 0xe,
- 0x9, 0xb, 0x3, 0x0, 0x8, 0x5, 0xc, 0xa }
-}};
-
-static const t_tab qt1 = {{
- { 0x2, 0x8, 0xb, 0xd, 0xf, 0x7, 0x6, 0xe,
- 0x3, 0x1, 0x9, 0x4, 0x0, 0xa, 0xc, 0x5 },
- { 0x1, 0xe, 0x2, 0xb, 0x4, 0xc, 0x3, 0x7,
- 0x6, 0xd, 0xa, 0x5, 0xf, 0x9, 0x0, 0x8 },
- { 0x4, 0xc, 0x7, 0x5, 0x1, 0x6, 0x9, 0xa,
- 0x0, 0xe, 0xd, 0x8, 0x2, 0xb, 0x3, 0xf },
- { 0xb, 0x9, 0x5, 0x1, 0xc, 0x3, 0xd, 0xe,
- 0x6, 0x4, 0x7, 0xf, 0x2, 0x0, 0x8, 0xa }
-}};
-
-static q_tab q0, q1;
-
-/* --- The MDS and Reed-Solomon matrices --- */
-
-static const octet mds[16] = {
- 0x01, 0xef, 0x5b, 0x5b,
- 0x5b, 0xef, 0xef, 0x01,
- 0xef, 0x5b, 0x01, 0xef,
- 0xef, 0x01, 0xef, 0x5b
-};
-
-static const octet rs[32] = {
- 0x01, 0xa4, 0x55, 0x87, 0x5a, 0x58, 0xdb, 0x9e,
- 0xa4, 0x56, 0x82, 0xf3, 0x1e, 0xc6, 0x68, 0xe5,
- 0x02, 0xa1, 0xfc, 0xc1, 0x47, 0xae, 0x3d, 0x19,
- 0xa4, 0x55, 0x87, 0x5a, 0x58, 0xdb, 0x9e, 0x03
-};
-
-/*----- Magic macros ------------------------------------------------------*/
-
-#define ROR4(x) ((((x) >> 1) | ((x) << 3)) & 15)
-
-/*----- Building and printing @q@ tables ----------------------------------*/
-
-/* --- @mkq@ --- *
- *
- * Arguments: @q_tab *q@ = pointer to output @q@ table
- * @const t_tab *t@ = pointer to input @t@ table
- * @const char *name@ = name of @q@ table
- *
- * Returns: ---
- *
- * Use: Constructs a 256-entry @q@-table.
- */
-
-static void mkq(q_tab *q, const t_tab *t, const char *name)
-{
- int i;
- int ok = 1;
-
- /* --- Ensure the t-table is well-formed --- */
-
- for (i = 0; i < 4; i++) {
- octet f[16] = { 0 };
- int j;
-
- for (j = 0; j < 16; j++) {
- if (f[t->t[i][j]]) {
- fprintf(stderr, "duplicate %i in %s[%i] (col %i and %i)\n",
- t->t[i][j], name, i, j, f[t->t[i][j]]);
- ok = 0;
- }
- f[t->t[i][j]] = j;
- }
- }
-
- if (!ok)
- exit(EXIT_FAILURE);
-
- /* --- Construct the @q@ table --- */
-
- for (i = 0; i < 256; i++) {
- int a = i >> 4, b = i & 15;
- int aa = t->t[0][a ^ b], bb = t->t[1][a ^ ((a << 3) & 15) ^ ROR4(b)];
- a = t->t[2][aa ^ bb], b = t->t[3][aa ^ ((aa << 3) & 15) ^ ROR4(bb)];
- q->q[i] = a | (b << 4);
- }
-
- /* Consider testing @q@ for linear and differential properties here */
-}
-
-/* --- @printq@ --- *
- *
- * Arguments: @const q_tab *t@ = pointer to table
- * @const char *name@ = pointer to table name
- *
- * Returns: ---
- *
- * Use: Prints a q table.
- */
-
-static void printq(const q_tab *q, const char *name)
-{
- int i;
- int j;
-
- printf("\
-#define TWOFISH_%s { \\\n\
- ", name);
- j = 0;
- for (i = 0; i < 256; i++) {
- printf("0x%02x", q->q[i]);
- j = (j + 1) & 7;
- if (i == 255)
- fputs(" \\\n}\n\n", stdout);
- else if (j == 0)
- fputs(", \\\n ", stdout);
- else
- fputs(", ", stdout);
- }
-}
-
-/*----- %$\gf{2^8}$% arithmetic -------------------------------------------*/
-
-#define MDS_MOD 0x169
-#define RS_MOD 0x14d
-
-/* --- @mul@ --- *
- *
- * Arguments: @unsigned x, y@ = polynomials over %$\gf{2^8}$%
- * @unsigned m@ = modulus
- *
- * Returns: The product of two polynomials.
- *
- * Use: Computes a product of polynomials, quite slowly.
- */
-
-static unsigned mul(unsigned x, unsigned y, unsigned m)
-{
- unsigned a = 0;
- unsigned i;
-
- for (i = 0; i < 8; i++) {
- if (y & 1)
- a ^= x;
- y >>= 1;
- x <<= 1;
- if (x & 0x100)
- x ^= m;
- }
-
- return (a);
-}
-
-/* --- @mmul@ --- *
- *
- * Arguments: @octet *d@ = destination vector
- * @const octet *p@ = matrix of bytes
- * @const octet *q@ = vector from somewhere else
- * @size_t r@ = size of destination or number of rows in matrix
- * @size_t n@ = length of row and vector
- * @unsigned m@ = modulus polynomial
- *
- * Returns: ---
- *
- * Use: Computes an inner product of matrices over the finite field
- * %$\gf{2^8}[x]/(m(x))$%. This isn't particularly rapid.
- */
-
-static void mmul(octet *d, const octet *p, const octet *q,
- size_t r, size_t n, unsigned m)
-{
- while (r) {
- const octet *qq = q;
- unsigned a = 0;
- unsigned i;
-
- for (i = 0; i < n; i++)
- a ^= mul(*p++, *qq++, m);
- *d++ = a;
- r--;
- }
-}
-
-/* --- @qrds@ --- *
- *
- * Arguments: ---
- *
- * Returns: ---
- *
- * Use: Prints the MDS/q table.
- */
-
-static void qmds(void)
-{
- uint32 t[4][256];
- int i, j;
- static const q_tab *q[4] = { &q1, &q0, &q1, &q0 };
-
- for (i = 0; i < 4; i++) {
- octet in[4] = { 0, 0, 0, 0 };
- octet out[4];
-
- for (j = 0; j < 256; j++) {
- in[i] = q[i]->q[j];
- mmul(out, mds, in, 4, 4, MDS_MOD);
- t[i][j] = LOAD32_L(out);
- }
- }
-
- puts("\
-/* --- Expanded MDS tables --- *\n\
- *\n\
- * The table contains output vectors for computing the result of pushing\n\
- * bytes through appropriate @q@ tables and the MDS matrix.\n\
- */\n\
-\n\
-#define TWOFISH_QMDS { \\");
- for (i = 0; i < 4; i++) {
- fputs(" { ", stdout);
- for (j = 0; j < 256; j++) {
- printf("0x%08lx", (unsigned long)t[i][j]);
- if (j == 255) {
- if (i == 3)
- puts(" } \\\n}");
- else
- puts(" }, \\\n\
- \\");
- } else if (j % 4 == 3)
- fputs(", \\\n ", stdout);
- else
- fputs(", ", stdout);
- }
- }
-
- putchar('\n');
-}
-
-/* --- @rslog@ --- *
- *
- * Arguments: ---
- *
- * Returns: ---
- *
- * Use: Produces the log and antilog tables for doing the RS
- * arithmetic efficiently.
- */
-
-static void rslog(void)
-{
- octet rslog[256];
- octet rsexp[256];
-
- unsigned x = 1;
- unsigned i;
-
- rslog[0] = 0;
- for (i = 0; i < 255; i++) {
- rslog[x] = i;
- rsexp[i] = x;
- x <<= 1;
- if (x & 0x100)
- x ^= RS_MOD;
- }
-
- x = 0;
- for (i = 0; i < 32; i++) {
- if (rslog[rs[i]] > x)
- x = rslog[rs[i]];
- }
-
- fputs("\
-/* --- Reed-Solomon log tables --- *\n\
- *\n\
- * The Reed-Solomon multiplies are accelerated by using log tables.\n\
- */\n\
-\n\
-#define TWOFISH_RSLOG { \\\n\
- ", stdout);
-
- for (i = 0; i < 256; i++) {
- printf("0x%02x", rslog[i]);
- if (i == 255)
- puts(" \\\n}\n");
- else if (i % 8 == 7)
- fputs(", \\\n ", stdout);
- else
- fputs(", ", stdout);
- }
-
- fputs("\
-#define TWOFISH_RSEXP { \\\n\
- ", stdout);
-
- for (i = 0; i < 255 + x + 1; i++) {
- printf("0x%02x", rsexp[i % 255]);
- if (i == 255 + x)
- puts(" \\\n}\n");
- else if (i % 8 == 7)
- fputs(", \\\n ", stdout);
- else
- fputs(", ", stdout);
- }
-
- fputs("\
-/* --- Reed-Solomon matrix with log entries --- */\n\
-\n\
-#define TWOFISH_RS { \\\n\
- ", stdout);
-
- for (i = 0; i < 32; i++) {
- printf("0x%02x", rslog[rs[i]]);
- if (i == 31)
- puts(" \\\n}\n");
- else if (i % 8 == 7)
- fputs(", \\\n ", stdout);
- else
- fputs(", ", stdout);
- }
-}
-
-/*----- Main program ------------------------------------------------------*/
-
-/* --- @main@ --- */
-
-int main(void)
-{
- fputs("\
-/* -*-c-*-\n\
- *\n\
- * Twofish q tables [generated]\n\
- */\n\
-\n\
-#ifndef CATACOMB_TWOFISH_TAB_H\n\
-#define CATACOMB_TWOFISH_TAB_H\n\
-\n\
-", stdout);
-
- /* --- The q tables --- */
-
- puts("\
-/* --- Precomputed @q@ tables --- */\n\
-");
- mkq(&q0, &qt0, "qt0");
- mkq(&q1, &qt1, "qt1");
- printq(&q0, "Q0");
- printq(&q1, "Q1");
-
- /* --- The MDS/q tables --- */
-
- qmds();
- rslog();
-
- /* --- Done --- */
-
- puts("#endif");
-
- if (fclose(stdout)) {
- fprintf(stderr, "error writing data\n");
- exit(EXIT_FAILURE);
- }
-
- return (0);
-}
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff