3 * $Id: serpent-check.c,v 1.1 2000/06/17 12:08:43 mdw Exp $
5 * Check the Serpent S-boxes
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: serpent-check.c,v $
33 * Revision 1.1 2000/06/17 12:08:43 mdw
38 /*----- Header files ------------------------------------------------------*/
44 #include <mLib/bits.h>
46 #include "serpent-sbox.h"
48 /*----- S-box tables ------------------------------------------------------*/
50 static const octet s
[8][16] = {
51 { 3, 8, 15, 1, 10, 6, 5, 11, 14, 13, 4, 2, 7, 0, 9, 12 },
52 { 15, 12, 2, 7, 9, 0, 5, 10, 1, 11, 14, 8, 6, 13, 3, 4 },
53 { 8, 6, 7, 9, 3, 12, 10, 15, 13, 1, 14, 4, 0, 11, 5, 2 },
54 { 0, 15, 11, 8, 12, 9, 6, 3, 13, 1, 2, 4, 10, 7, 5, 14 },
55 { 1, 15, 8, 3, 12, 0, 11, 6, 2, 5, 4, 10, 9, 14, 7, 13 },
56 { 15, 5, 2, 11, 4, 10, 9, 12, 0, 3, 14, 8, 13, 6, 7, 1 },
57 { 7, 2, 12, 5, 8, 4, 6, 11, 14, 9, 1, 15, 13, 3, 10, 0 },
58 { 1, 13, 15, 0, 14, 8, 2, 11, 7, 4, 12, 10, 9, 3, 5, 6 }
61 /*----- Main code ---------------------------------------------------------*/
65 * Arguments: @unsigned a, b, c, d@ = four bitslice output registers
66 * @const octet *p@ = pointer to S-box
68 * Returns: Zero if OK, nonzero on failure.
70 * Use: Checks that an S-box output is correct.
73 static int check(unsigned a
, unsigned b
, unsigned c
, unsigned d
,
80 for (i
= 0; i
< 16; i
++) {
81 *q
++ = (a
& 1) | ((b
& 1) << 1) | ((c
& 1) << 2) | ((d
& 1) << 3);
82 a
>>= 1; b
>>= 1; c
>>= 1; d
>>= 1;
84 return (memcmp(buf
, p
, sizeof(buf
)));
87 #define CHECK(i) do { \
88 unsigned a = 0xaaaa, b = 0xcccc, c = 0xf0f0, d = 0xff00; \
90 if (check(a, b, c, d, s[i])) { \
91 fprintf(stderr, "failure in S%i\n", i); \
95 if (a != 0xaaaa || b != 0xcccc || c != 0xf0f0 || d != 0xff00) { \
96 fprintf(stderr, "failure in IS%i\n", i); \
104 CHECK(0); CHECK(1); CHECK(2); CHECK(3);
105 CHECK(4); CHECK(5); CHECK(6); CHECK(7);
109 /*----- That's all, folks -------------------------------------------------*/