3 * $Id: blowfish-mktab.c,v 1.1 2000/06/17 10:47:28 mdw Exp $
5 * Build Blowfish key table
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: 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.
38 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
45 /*----- Main code ---------------------------------------------------------*/
49 * Arguments: @uint32 *buf@ = pointer to the output buffer
50 * @size_t n@ = number of output digits wanted
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
61 * I've not analysed the algorithm very much.
64 #define SPIGOT_WORDS (18 + 4 * 256ul)
66 #define SPIGOT_RADIX (1ul << SPIGOT_BITS)
67 #define SPIGOT_BUFLEN (SPIGOT_WORDS * 32)
69 static void spigot(uint32
*buf
, size_t n
)
73 unsigned a
[SPIGOT_BUFLEN
] = { 0 };
76 unsigned max
= 32 * n
;
82 #define EMIT(z) do { \
86 acc = (acc << SPIGOT_BITS) | (z); \
105 uint32 k
= max
* 2 - 1;
107 for (i
= max
; i
; i
--) {
108 x
= (b
== -1 ? SPIGOT_RADIX
* 2 : a
[i
- 1] << SPIGOT_BITS
) + q
* i
;
110 a
[i
- 1] = x
- q
* k
;
114 k
= x
& (SPIGOT_RADIX
- 1);
115 if (k
== SPIGOT_RADIX
- 1)
118 EMIT(p
+ (x
>> SPIGOT_BITS
));
120 unsigned d
= (x
>= SPIGOT_RADIX ?
0 : SPIGOT_RADIX
- 1);
140 uint32 dbuf
[SPIGOT_WORDS
];
144 spigot(d
, SPIGOT_WORDS
);
149 * Blowfish initial key table [generated]\n\
152 #ifndef CATACOMB_BLOWFISH_TAB_H\n\
153 #define CATACOMB_BLOWFISH_TAB_H\n\
155 #define BLOWFISH_IKEY { \\\n\
158 for (i
= 0; i
< 18; i
++) {
159 printf("0x%08x", *d
++);
165 fputs(", \\\n ", stdout
);
170 for (j
= 0; j
< 4; j
++) {
171 for (i
= 0; i
< 256; i
++) {
172 printf("0x%08x", *d
++);
175 fputs(" } \\\n}\n\n#endif\n", stdout
);
180 } else if (i
% 4 == 3)
181 fputs(", \\\n ", stdout
);
187 if (fclose(stdout
)) {
188 fprintf(stderr
, "error writing data\n");
194 /*----- That's all, folks -------------------------------------------------*/