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1 | /* -*-c-*- |
2 | * | |
05dfc037 | 3 | * $Id$ |
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4 | * |
5 | * Search for invertible matrices | |
6 | * | |
7 | * (c) 2000 Mark Wooding | |
8 | */ | |
9 | ||
10 | /*----- Licensing notice --------------------------------------------------* | |
11 | * | |
12 | * Copyright (c) 2000 Mark Wooding | |
13 | * All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions are | |
17 | * met: | |
18 | * | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * | |
22 | * 2, Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * 3. The name of the authors may not be used to endorse or promote | |
27 | * products derived from this software without specific prior written | |
28 | * permission. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
31 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
32 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
6b2d9d76 | 33 | * NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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34 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
35 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
36 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
37 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
38 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | |
39 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | * Instead of accepting the above terms, you may redistribute and/or modify | |
43 | * this software under the terms of either the GNU General Public License, | |
44 | * or the GNU Library General Public License, published by the Free | |
45 | * Software Foundation; either version 2 of the License, or (at your | |
46 | * option) any later version. | |
47 | */ | |
48 | ||
49 | /*----- Revision history --------------------------------------------------* | |
50 | * | |
51 | * $Log: storin-mktab.c,v $ | |
6b2d9d76 MW |
52 | * Revision 1.2 2000/07/02 15:21:20 mdw |
53 | * Fix licence text. | |
54 | * | |
e6e0e332 MW |
55 | * Revision 1.1 2000/05/21 11:28:30 mdw |
56 | * Initial check-in. | |
57 | * | |
58 | */ | |
59 | ||
60 | /*----- Header files ------------------------------------------------------*/ | |
61 | ||
62 | #include <stdio.h> | |
63 | #include <stdlib.h> | |
64 | ||
65 | #include "bits.h" | |
66 | ||
67 | #include "dsarand.h" | |
68 | #include "sha.h" | |
69 | ||
70 | #include "arith24.h" | |
71 | #include "matrix.h" | |
72 | ||
73 | /*----- Main code ---------------------------------------------------------*/ | |
74 | ||
75 | int main(int argc, char *argv[]) | |
76 | { | |
77 | dsarand r; | |
78 | int i, j; | |
79 | uint24 d[16], a[16]; | |
80 | ||
81 | /* --- Make the seed string --- */ | |
82 | ||
83 | { | |
84 | sha_ctx s; | |
85 | octet h[SHA_HASHSZ]; | |
86 | const char *p = "matrix-seed-string"; | |
87 | size_t sz; | |
88 | ||
89 | if (argv[1]) | |
90 | p = argv[1]; | |
91 | sz = strlen(p); | |
92 | sha_init(&s); | |
93 | sha_hash(&s, p, sz); | |
94 | sha_done(&s, h); | |
95 | dsarand_init(&r, h, sizeof(h)); | |
96 | r.passes = 2; | |
97 | } | |
98 | ||
99 | /* --- Make a matrix --- */ | |
100 | ||
101 | for (;;) { | |
102 | octet b[4]; | |
103 | ||
104 | for (i = 0; i < 16; i++) { | |
105 | octet w[3]; | |
106 | dsarand_fill(&r, w, sizeof(w)); | |
107 | a[i] = LOAD24(w); | |
108 | } | |
109 | ||
110 | /* --- Ensure the LSBs have appropriate properties --- */ | |
111 | ||
112 | for (i = 0; i < 4; i++) { | |
113 | int bb = -1; | |
114 | for (j = 0; j < 4; j++) { | |
115 | if ((a[i * 4 + j] & 1) == 0) { | |
116 | if (bb == -1) | |
117 | bb = j; | |
118 | else | |
119 | goto reject; | |
120 | } | |
121 | } | |
122 | if (bb == -1) | |
123 | goto reject; | |
124 | for (j = 0; j < i; j++) { | |
125 | if (b[j] == bb) | |
126 | goto reject; | |
127 | } | |
128 | b[i] = bb; | |
129 | } | |
130 | ||
131 | /* --- Ensure the matrix is invertible (and invert it) --- */ | |
132 | ||
133 | if (matinv(d, a, 4, 4) == 0) | |
134 | break; | |
135 | reject:; | |
136 | } | |
137 | ||
138 | fputs("\ | |
139 | /* -*-c-*-\n\ | |
140 | *\n\ | |
141 | * Tables for Storin [generated]\n\ | |
142 | */\n\ | |
143 | \n\ | |
144 | #ifndef STORIN_TAB_H\n\ | |
145 | #define STORIN_TAB_H\n\ | |
146 | \n\ | |
147 | #define STORIN_M { \\\n\ | |
148 | ", stdout); | |
149 | ||
150 | for (i = 0; i < 16; i++) { | |
151 | printf("0x%06x", a[i]); | |
152 | if (i == 15) | |
153 | fputs(" \\\n}\n\n", stdout); | |
154 | else if (i % 4 == 3) | |
155 | fputs(", \\\n ", stdout); | |
156 | else | |
157 | fputs(", ", stdout); | |
158 | } | |
159 | ||
160 | fputs("\ | |
161 | #define STORIN_MI { \\\n\ | |
162 | ", stdout); | |
163 | ||
164 | for (i = 0; i < 16; i++) { | |
165 | printf("0x%06x", d[i]); | |
166 | if (i == 15) | |
167 | fputs(" \\\n}\n\n", stdout); | |
168 | else if (i % 4 == 3) | |
169 | fputs(", \\\n ", stdout); | |
170 | else | |
171 | fputs(", ", stdout); | |
172 | } | |
173 | ||
174 | fputs("#endif\n", stdout); | |
175 | ||
176 | if (fclose(stdout)) { | |
177 | fputs("error writing data\n", stderr); | |
178 | exit(EXIT_FAILURE); | |
179 | } | |
180 | ||
181 | return (0); | |
182 | } | |
183 | ||
184 | /*----- That's all, folks -------------------------------------------------*/ |