3 * Check the Serpent S-boxes
5 * (c) 2000 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
34 #include <mLib/bits.h>
36 #include "serpent-sbox.h"
38 /*----- S-box tables ------------------------------------------------------*/
40 static const octet s[8][16] = {
41 { 3, 8, 15, 1, 10, 6, 5, 11, 14, 13, 4, 2, 7, 0, 9, 12 },
42 { 15, 12, 2, 7, 9, 0, 5, 10, 1, 11, 14, 8, 6, 13, 3, 4 },
43 { 8, 6, 7, 9, 3, 12, 10, 15, 13, 1, 14, 4, 0, 11, 5, 2 },
44 { 0, 15, 11, 8, 12, 9, 6, 3, 13, 1, 2, 4, 10, 7, 5, 14 },
45 { 1, 15, 8, 3, 12, 0, 11, 6, 2, 5, 4, 10, 9, 14, 7, 13 },
46 { 15, 5, 2, 11, 4, 10, 9, 12, 0, 3, 14, 8, 13, 6, 7, 1 },
47 { 7, 2, 12, 5, 8, 4, 6, 11, 14, 9, 1, 15, 13, 3, 10, 0 },
48 { 1, 13, 15, 0, 14, 8, 2, 11, 7, 4, 12, 10, 9, 3, 5, 6 }
51 /*----- Main code ---------------------------------------------------------*/
55 * Arguments: @unsigned a, b, c, d@ = four bitslice output registers
56 * @const octet *p@ = pointer to S-box
58 * Returns: Zero if OK, nonzero on failure.
60 * Use: Checks that an S-box output is correct.
63 static int check(unsigned a, unsigned b, unsigned c, unsigned d,
70 for (i = 0; i < 16; i++) {
71 *q++ = (a & 1) | ((b & 1) << 1) | ((c & 1) << 2) | ((d & 1) << 3);
72 a >>= 1; b >>= 1; c >>= 1; d >>= 1;
74 return (memcmp(buf, p, sizeof(buf)));
77 #define CHECK(i) do { \
78 unsigned a = 0xaaaa, b = 0xcccc, c = 0xf0f0, d = 0xff00; \
80 if (check(a, b, c, d, s[i])) { \
81 fprintf(stderr, "failure in S%i\n", i); \
85 if (a != 0xaaaa || b != 0xcccc || c != 0xf0f0 || d != 0xff00) { \
86 fprintf(stderr, "failure in IS%i\n", i); \
94 CHECK(0); CHECK(1); CHECK(2); CHECK(3);
95 CHECK(4); CHECK(5); CHECK(6); CHECK(7);
99 /*----- That's all, folks -------------------------------------------------*/