3 * $Id: blowfish-mktab.c,v 1.3 2004/04/08 01:36:15 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 /*----- Header files ------------------------------------------------------*/
35 #include <mLib/bits.h>
37 /*----- Main code ---------------------------------------------------------*/
41 * Arguments: @uint32 *buf@ = pointer to the output buffer
42 * @size_t n@ = number of output digits wanted
46 * Use: Writes digits of %$\pi$% to the given array. The algorithm
47 * is based on the Spigot algorithm by Stanley Rabinowitz and
48 * Stan Wagon, published in Amer.Math.Monthly, March 1995, with
49 * bug fixes by C. Haenel. I then bodged it to output hex
50 * digits rather than decimal ones, and to leave off the initial
53 * I've not analysed the algorithm very much.
56 #define SPIGOT_WORDS (18 + 4 * 256ul)
58 #define SPIGOT_RADIX (1ul << SPIGOT_BITS)
59 #define SPIGOT_BUFLEN (SPIGOT_WORDS * 32)
61 static void spigot(uint32
*buf
, size_t n
)
65 unsigned a
[SPIGOT_BUFLEN
] = { 0 };
68 unsigned max
= 32 * n
;
74 #define EMIT(z) do { \
78 acc = (acc << SPIGOT_BITS) | (z); \
97 uint32 k
= max
* 2 - 1;
99 for (i
= max
; i
; i
--) {
100 x
= (b
== -1 ? SPIGOT_RADIX
* 2 : a
[i
- 1] << SPIGOT_BITS
) + q
* i
;
102 a
[i
- 1] = x
- q
* k
;
106 k
= x
& (SPIGOT_RADIX
- 1);
107 if (k
== SPIGOT_RADIX
- 1)
110 EMIT(p
+ (x
>> SPIGOT_BITS
));
112 unsigned d
= (x
>= SPIGOT_RADIX ?
0 : SPIGOT_RADIX
- 1);
132 uint32 dbuf
[SPIGOT_WORDS
];
136 spigot(d
, SPIGOT_WORDS
);
141 * Blowfish initial key table [generated]\n\
144 #ifndef CATACOMB_BLOWFISH_TAB_H\n\
145 #define CATACOMB_BLOWFISH_TAB_H\n\
147 #define BLOWFISH_IKEY { \\\n\
150 for (i
= 0; i
< 18; i
++) {
151 printf("0x%08x", *d
++);
157 fputs(", \\\n ", stdout
);
162 for (j
= 0; j
< 4; j
++) {
163 for (i
= 0; i
< 256; i
++) {
164 printf("0x%08x", *d
++);
167 fputs(" } \\\n}\n\n#endif\n", stdout
);
172 } else if (i
% 4 == 3)
173 fputs(", \\\n ", stdout
);
179 if (fclose(stdout
)) {
180 fprintf(stderr
, "error writing data\n");
186 /*----- That's all, folks -------------------------------------------------*/