245bfdef |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: blowfish-mktab.c,v 1.1 2000/06/17 10:47:28 mdw Exp $ |
4 | * |
5 | * Build Blowfish key table |
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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: blowfish-mktab.c,v $ |
33 | * Revision 1.1 2000/06/17 10:47:28 mdw |
34 | * Emits Blowfish initial key data, derived from the digits of pi. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <stdio.h> |
41 | #include <stdlib.h> |
42 | |
43 | #include <mLib/bits.h> |
44 | |
45 | /*----- Main code ---------------------------------------------------------*/ |
46 | |
47 | /* --- @spigot@ --- * |
48 | * |
49 | * Arguments: @uint32 *buf@ = pointer to the output buffer |
50 | * @size_t n@ = number of output digits wanted |
51 | * |
52 | * Returns: --- |
53 | * |
54 | * Use: Writes digits of %$\pi$% to the given array. The algorithm |
55 | * is based on the Spigot algorithm by Stanley Rabinowitz and |
56 | * Stan Wagon, published in Amer.Math.Monthly, March 1995, with |
57 | * bug fixes by C. Haenel. I then bodged it to output hex |
58 | * digits rather than decimal ones, and to leave off the initial |
59 | * `3'. |
60 | * |
61 | * I've not analysed the algorithm very much. |
62 | */ |
63 | |
64 | #define SPIGOT_WORDS (18 + 4 * 256ul) |
65 | #define SPIGOT_BITS 8 |
66 | #define SPIGOT_RADIX (1ul << SPIGOT_BITS) |
67 | #define SPIGOT_BUFLEN (SPIGOT_WORDS * 32) |
68 | |
69 | static void spigot(uint32 *buf, size_t n) |
70 | { |
71 | uint32 acc = 0; |
72 | int b = -1; |
73 | unsigned a[SPIGOT_BUFLEN] = { 0 }; |
74 | uint32 p = 0; |
75 | unsigned f = 0; |
76 | unsigned max = 32 * n; |
77 | size_t step = n / 60; |
78 | |
79 | fputs("[ ]\r[", |
80 | stderr); |
81 | |
82 | #define EMIT(z) do { \ |
83 | if (b == -1) \ |
84 | b = 0; \ |
85 | else { \ |
86 | acc = (acc << SPIGOT_BITS) | (z); \ |
87 | b += SPIGOT_BITS; \ |
88 | if (b == 32) { \ |
89 | *buf++ = acc; \ |
90 | acc = 0; \ |
91 | b = 0; \ |
92 | n--; \ |
93 | if (!n) \ |
94 | goto done; \ |
95 | if (n % step == 0) \ |
96 | fputc('.', stderr); \ |
97 | } \ |
98 | } \ |
99 | } while (0) |
100 | |
101 | while (n) { |
102 | uint32 q = 0; |
103 | uint32 i; |
104 | uint32 x; |
105 | uint32 k = max * 2 - 1; |
106 | |
107 | for (i = max; i; i--) { |
108 | x = (b == -1 ? SPIGOT_RADIX * 2 : a[i - 1] << SPIGOT_BITS) + q * i; |
109 | q = x / k; |
110 | a[i - 1] = x - q * k; |
111 | k -= 2; |
112 | } |
113 | |
114 | k = x & (SPIGOT_RADIX - 1); |
115 | if (k == SPIGOT_RADIX - 1) |
116 | f++; |
117 | else { |
118 | EMIT(p + (x >> SPIGOT_BITS)); |
119 | if (f) { |
120 | unsigned d = (x >= SPIGOT_RADIX ? 0 : SPIGOT_RADIX - 1); |
121 | while (f) { |
122 | EMIT(d); |
123 | f--; |
124 | } |
125 | } |
126 | p = k; |
127 | } |
128 | } |
129 | |
130 | done: |
131 | fputc('\n', stderr); |
132 | |
133 | #undef EMIT |
134 | } |
135 | |
136 | /* --- @main@ --- */ |
137 | |
138 | int main(void) |
139 | { |
140 | uint32 dbuf[SPIGOT_WORDS]; |
141 | int i, j; |
142 | uint32 *d = dbuf; |
143 | |
144 | spigot(d, SPIGOT_WORDS); |
145 | |
146 | fputs("\ |
147 | /* -*-c-*-\n\ |
148 | *\n\ |
149 | * Blowfish initial key table [generated]\n\ |
150 | */\n\ |
151 | \n\ |
152 | #ifndef CATACOMB_BLOWFISH_TAB_H\n\ |
153 | #define CATACOMB_BLOWFISH_TAB_H\n\ |
154 | \n\ |
155 | #define BLOWFISH_IKEY { \\\n\ |
156 | { ", stdout); |
157 | |
158 | for (i = 0; i < 18; i++) { |
159 | printf("0x%08x", *d++); |
160 | if (i == 17) |
161 | fputs(" }, \\\n\ |
162 | \\\n\ |
163 | { ", stdout); |
164 | else if (i % 4 == 3) |
165 | fputs(", \\\n ", stdout); |
166 | else |
167 | fputs(", ", stdout); |
168 | } |
169 | |
170 | for (j = 0; j < 4; j++) { |
171 | for (i = 0; i < 256; i++) { |
172 | printf("0x%08x", *d++); |
173 | if (i == 255) { |
174 | if (j == 3) |
175 | fputs(" } \\\n}\n\n#endif\n", stdout); |
176 | else |
177 | fputs(" }, \\\n\ |
178 | \\\n\ |
179 | { ", stdout); |
180 | } else if (i % 4 == 3) |
181 | fputs(", \\\n ", stdout); |
182 | else |
183 | fputs(", ", stdout); |
184 | } |
185 | } |
186 | |
187 | if (fclose(stdout)) { |
188 | fprintf(stderr, "error writing data\n"); |
189 | exit(EXIT_FAILURE); |
190 | } |
191 | return (0); |
192 | } |
193 | |
194 | /*----- That's all, folks -------------------------------------------------*/ |