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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: serpent-check.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Check the Serpent S-boxes |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
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. |
18 | * |
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. |
23 | * |
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, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <stdio.h> |
33 | #include <stdlib.h> |
34 | #include <string.h> |
35 | |
36 | #include <mLib/bits.h> |
37 | |
38 | #include "serpent-sbox.h" |
39 | |
40 | /*----- S-box tables ------------------------------------------------------*/ |
41 | |
42 | static const octet s[8][16] = { |
43 | { 3, 8, 15, 1, 10, 6, 5, 11, 14, 13, 4, 2, 7, 0, 9, 12 }, |
44 | { 15, 12, 2, 7, 9, 0, 5, 10, 1, 11, 14, 8, 6, 13, 3, 4 }, |
45 | { 8, 6, 7, 9, 3, 12, 10, 15, 13, 1, 14, 4, 0, 11, 5, 2 }, |
46 | { 0, 15, 11, 8, 12, 9, 6, 3, 13, 1, 2, 4, 10, 7, 5, 14 }, |
47 | { 1, 15, 8, 3, 12, 0, 11, 6, 2, 5, 4, 10, 9, 14, 7, 13 }, |
48 | { 15, 5, 2, 11, 4, 10, 9, 12, 0, 3, 14, 8, 13, 6, 7, 1 }, |
49 | { 7, 2, 12, 5, 8, 4, 6, 11, 14, 9, 1, 15, 13, 3, 10, 0 }, |
50 | { 1, 13, 15, 0, 14, 8, 2, 11, 7, 4, 12, 10, 9, 3, 5, 6 } |
51 | }; |
52 | |
53 | /*----- Main code ---------------------------------------------------------*/ |
54 | |
55 | /* --- @check@ --- * |
56 | * |
57 | * Arguments: @unsigned a, b, c, d@ = four bitslice output registers |
58 | * @const octet *p@ = pointer to S-box |
59 | * |
60 | * Returns: Zero if OK, nonzero on failure. |
61 | * |
62 | * Use: Checks that an S-box output is correct. |
63 | */ |
64 | |
65 | static int check(unsigned a, unsigned b, unsigned c, unsigned d, |
66 | const octet *p) |
67 | { |
68 | octet buf[16]; |
69 | octet *q = buf; |
70 | unsigned i; |
71 | |
72 | for (i = 0; i < 16; i++) { |
73 | *q++ = (a & 1) | ((b & 1) << 1) | ((c & 1) << 2) | ((d & 1) << 3); |
74 | a >>= 1; b >>= 1; c >>= 1; d >>= 1; |
75 | } |
76 | return (memcmp(buf, p, sizeof(buf))); |
77 | } |
78 | |
79 | #define CHECK(i) do { \ |
80 | unsigned a = 0xaaaa, b = 0xcccc, c = 0xf0f0, d = 0xff00; \ |
81 | S##i(a, b, c, d); \ |
82 | if (check(a, b, c, d, s[i])) { \ |
83 | fprintf(stderr, "failure in S%i\n", i); \ |
84 | rc = EXIT_FAILURE; \ |
85 | } \ |
86 | IS##i(a, b, c, d); \ |
87 | if (a != 0xaaaa || b != 0xcccc || c != 0xf0f0 || d != 0xff00) { \ |
88 | fprintf(stderr, "failure in IS%i\n", i); \ |
89 | rc = EXIT_FAILURE; \ |
90 | } \ |
91 | } while (0) |
92 | |
93 | int main(void) |
94 | { |
95 | int rc = 0; |
96 | CHECK(0); CHECK(1); CHECK(2); CHECK(3); |
97 | CHECK(4); CHECK(5); CHECK(6); CHECK(7); |
98 | return (rc); |
99 | } |
100 | |
101 | /*----- That's all, folks -------------------------------------------------*/ |