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Formatting fixes. Very boring.
[become] / src / blowfish.c
1 /* -*-c-*-
2 *
3 * $Id: blowfish.c,v 1.4 1997/12/08 15:29:50 mdw Exp $
4 *
5 * Blowfish encryption routines
6 *
7 * (c) 1997 Mark Wooding
8 */
9
10 /*----- Licencing notice --------------------------------------------------*
11 *
12 * This file is part of `become'
13 *
14 * `Become' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * `Become' 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 General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 */
28
29 /*----- Revision history --------------------------------------------------*
30 *
31 * $Log: blowfish.c,v $
32 * Revision 1.4 1997/12/08 15:29:50 mdw
33 * Formatting fixes. Very boring.
34 *
35 * Revision 1.3 1997/08/07 09:42:58 mdw
36 * Fix address of the FSF.
37 *
38 * Revision 1.2 1997/08/04 10:24:20 mdw
39 * Sources placed under CVS control.
40 *
41 * Revision 1.1 1997/07/21 13:47:53 mdw
42 * Initial revision
43 *
44 */
45
46 /*----- Header files ------------------------------------------------------*/
47
48 /* --- ANSI headers --- */
49
50 #include <stdio.h>
51
52 /* --- Local headers --- */
53
54 #include "config.h"
55 #include "blowfish.h"
56 #include "utils.h"
57
58 /*----- Define the initial S-box values -----------------------------------*/
59
60 #include "blowfish-sbox.h"
61
62 /*----- Useful macros -----------------------------------------------------*/
63
64 /* --- The Blowfish round function --- *
65 *
66 * This is why I like this cipher. The round function is microscopic. And
67 * very fast.
68 */
69
70 #define ROUND(L, R, K) \
71 ((L) ^= k->p[K], \
72 (R) ^= ((((k->s0[((L) >> 24) & 0xFF]) + \
73 k->s1[((L) >> 16) & 0xFF]) ^ \
74 k->s2[((L) >> 8) & 0xFF]) + \
75 k->s3[((L) >> 0) & 0xFF]))
76
77 /*----- Main code ---------------------------------------------------------*/
78
79 /* --- @blowfish_encrypt@ --- *
80 *
81 * Arguments: @const blowfish_key *k@ = pointer to key block
82 * @const void *from@ = block to encrypt from
83 * @void *to@ = block to encrypt to
84 *
85 * Returns: ---
86 *
87 * Use: Encrypts a block using the Blowfish algorithm.
88 */
89
90 void blowfish_encrypt(const blowfish_key *k, const void *from, void *to)
91 {
92 uint_32 l, r;
93 const unsigned char *f = from;
94 unsigned char *t = to;
95
96 /* --- Extract left and right block halves --- */
97
98 l = load32(f + 0);
99 r = load32(f + 4);
100
101 /* --- Now run the round function on these values --- */
102
103 ROUND(l, r, 0);
104 ROUND(r, l, 1);
105 ROUND(l, r, 2);
106 ROUND(r, l, 3);
107 ROUND(l, r, 4);
108 ROUND(r, l, 5);
109 ROUND(l, r, 6);
110 ROUND(r, l, 7);
111 ROUND(l, r, 8);
112 ROUND(r, l, 9);
113 ROUND(l, r, 10);
114 ROUND(r, l, 11);
115 ROUND(l, r, 12);
116 ROUND(r, l, 13);
117 ROUND(l, r, 14);
118 ROUND(r, l, 15);
119
120 /* --- Final transformation --- */
121
122 l ^= k->p[16];
123 r ^= k->p[17];
124
125 /* --- Store the encrypted value --- */
126
127 store32(t + 0, r);
128 store32(t + 4, l);
129 }
130
131 /* --- @blowfish_decrypt@ --- *
132 *
133 * Arguments: @const blowfish_key *k@ = pointer to key block
134 * @const void *from@ = block to decrypt from
135 * @void *to@ = block to decrypt to
136 *
137 * Returns: ---
138 *
139 * Use: Decrypts a block using the Blowfish algorithm.
140 */
141
142 void blowfish_decrypt(const blowfish_key *k, const void *from, void *to)
143 {
144 uint_32 l, r;
145 const unsigned char *f = from;
146 unsigned char *t = to;
147
148 /* --- Extract left and right block halves --- */
149
150 l = load32(f + 0);
151 r = load32(f + 4);
152
153 /* --- Now run the round function on these values --- */
154
155 ROUND(l, r, 17);
156 ROUND(r, l, 16);
157 ROUND(l, r, 15);
158 ROUND(r, l, 14);
159 ROUND(l, r, 13);
160 ROUND(r, l, 12);
161 ROUND(l, r, 11);
162 ROUND(r, l, 10);
163 ROUND(l, r, 9);
164 ROUND(r, l, 8);
165 ROUND(l, r, 7);
166 ROUND(r, l, 6);
167 ROUND(l, r, 5);
168 ROUND(r, l, 4);
169 ROUND(l, r, 3);
170 ROUND(r, l, 2);
171
172 /* --- Final transformation --- */
173
174 l ^= k->p[1];
175 r ^= k->p[0];
176
177 /* --- Store the decrypted value --- */
178
179 store32(t + 0, r);
180 store32(t + 4, l);
181 }
182
183 /* --- @blowfish__qcrypt@ --- *
184 *
185 * Arguments: @const blowfish_key *k@ = pointer to a key block
186 * @uint_32 *p@ = pointer to block to mangle
187 *
188 * Returns: ---
189 *
190 * Use: Mangles a block using the Blowfish algorithm.
191 */
192
193 static void blowfish__qcrypt(blowfish_key *k, uint_32 *p)
194 {
195 uint_32 l = p[0], r = p[1];
196
197 /* --- Run the round function --- */
198
199 ROUND(l, r, 0);
200 ROUND(r, l, 1);
201 ROUND(l, r, 2);
202 ROUND(r, l, 3);
203 ROUND(l, r, 4);
204 ROUND(r, l, 5);
205 ROUND(l, r, 6);
206 ROUND(r, l, 7);
207 ROUND(l, r, 8);
208 ROUND(r, l, 9);
209 ROUND(l, r, 10);
210 ROUND(r, l, 11);
211 ROUND(l, r, 12);
212 ROUND(r, l, 13);
213 ROUND(l, r, 14);
214 ROUND(r, l, 15);
215
216 /* --- Output transformation --- */
217
218 l ^= k->p[16];
219 r ^= k->p[17];
220
221 /* --- Store the new values --- */
222
223 p[0] = r;
224 p[1] = l;
225 }
226
227 /* --- @blowfish__buildKey@ --- *
228 *
229 * Arguments: @blowfish_key *k@ = pointer to a key block to set up
230 *
231 * Returns: ---
232 *
233 * Use: Sets up the P-array and S-boxes once a key has been mixed
234 * into the P-array. Use a local copy of the Blowfish
235 * encryption routine, to avoid penalising the main code too
236 * much with having to veneer onto a general args-in-words
237 * function, and to avoid me messing about with transforming
238 * values backwards and forwards between char arrays and
239 * integers.
240 */
241
242 static void blowfish__buildKey(blowfish_key *k)
243 {
244 uint_32 b[2] = { 0, 0 };
245 int i;
246
247 /* --- First, run through the P-array --- */
248
249 for (i = 0; i < 18; i += 2) {
250 blowfish__qcrypt(k, b);
251 k->p[i] = b[0];
252 k->p[i + 1] = b[1];
253 }
254
255 /* --- Now do the S-boxes --- */
256
257 for (i = 0; i < 256; i += 2) {
258 blowfish__qcrypt(k, b);
259 k->s0[i] = b[0];
260 k->s0[i + 1] = b[1];
261 }
262
263 for (i = 0; i < 256; i += 2) {
264 blowfish__qcrypt(k, b);
265 k->s1[i] = b[0];
266 k->s1[i + 1] = b[1];
267 }
268
269 for (i = 0; i < 256; i += 2) {
270 blowfish__qcrypt(k, b);
271 k->s2[i] = b[0];
272 k->s2[i + 1] = b[1];
273 }
274
275 for (i = 0; i < 256; i += 2) {
276 blowfish__qcrypt(k, b);
277 k->s3[i] = b[0];
278 k->s3[i + 1] = b[1];
279 }
280 }
281
282 /* --- @blowfish_setKey@ --- *
283 *
284 * Arguments: @blowfish_key *kb@ = pointer to key block to fill
285 * @void *k@ = pointer to key data
286 * @size_t sz@ = length of data in bytes
287 *
288 * Returns: ---
289 *
290 * Use: Expands a key which isn't represented as a number of whole
291 * words. This is a nonstandard extension, although it can be
292 * used to support 40-bit keys, which some governments might
293 * find more palatable than 160-bit (or 448-bit!) keys.
294 */
295
296 void blowfish_setKey(blowfish_key *kb, const void *k, size_t sz)
297 {
298 int i, j, l;
299 const unsigned char *p = k;
300 uint_32 a;
301
302 memcpy(kb, &blowfish__init, sizeof(blowfish__init));
303
304 j = 0;
305 for (i = 0; i < 18; i++) {
306 a = 0;
307 for (l = 0; l < 4; l++) {
308 a = (a << 8) | p[j];
309 j++;
310 if (j >= sz)
311 j = 0;
312 }
313 kb->p[i] ^= a;
314 }
315
316 blowfish__buildKey(kb);
317 }
318
319 /*----- Test rig ----------------------------------------------------------*/
320
321 #ifdef TEST_RIG
322
323 int main(void)
324 {
325 /* --- Stage one: ECB tests --- */
326
327 {
328 static struct {
329 uint_32 k[2];
330 uint_32 p[2];
331 uint_32 c[2];
332 } table[] = {
333 { { 0x00000000u, 0x00000000u },
334 { 0x00000000u, 0x00000000u },
335 { 0x4EF99745u, 0x6198DD78u } },
336
337 { { 0xFFFFFFFFu, 0xFFFFFFFFu },
338 { 0xFFFFFFFFu, 0xFFFFFFFFu },
339 { 0x51866FD5u, 0xB85ECB8Au } },
340
341 { { 0x30000000u, 0x00000000u },
342 { 0x10000000u, 0x00000001u },
343 { 0x7D856F9Au, 0x613063F2u } },
344
345 { { 0x11111111u, 0x11111111u },
346 { 0x11111111u, 0x11111111u },
347 { 0x2466DD87u, 0x8B963C9Du } },
348
349 { { 0x01234567u, 0x89ABCDEFu },
350 { 0x11111111u, 0x11111111u },
351 { 0x61F9C380u, 0x2281B096u } },
352
353 { { 0x11111111u, 0x11111111u },
354 { 0x01234567u, 0x89ABCDEFu },
355 { 0x7D0CC630u, 0xAFDA1EC7u } },
356
357 { { 0x00000000u, 0x00000000u },
358 { 0x00000000u, 0x00000000u },
359 { 0x4EF99745u, 0x6198DD78u } },
360
361 { { 0xFEDCBA98u, 0x76543210u },
362 { 0x01234567u, 0x89ABCDEFu },
363 { 0x0ACEAB0Fu, 0xC6A0A28Du } },
364
365 { { 0x7CA11045u, 0x4A1A6E57u },
366 { 0x01A1D6D0u, 0x39776742u },
367 { 0x59C68245u, 0xEB05282Bu } },
368
369 { { 0x0131D961u, 0x9DC1376Eu },
370 { 0x5CD54CA8u, 0x3DEF57DAu },
371 { 0xB1B8CC0Bu, 0x250F09A0u } },
372
373 { { 0x07A1133Eu, 0x4A0B2686u },
374 { 0x0248D438u, 0x06F67172u },
375 { 0x1730E577u, 0x8BEA1DA4u } },
376
377 { { 0x3849674Cu, 0x2602319Eu },
378 { 0x51454B58u, 0x2DDF440Au },
379 { 0xA25E7856u, 0xCF2651EBu } },
380
381 { { 0x04B915BAu, 0x43FEB5B6u },
382 { 0x42FD4430u, 0x59577FA2u },
383 { 0x353882B1u, 0x09CE8F1Au } },
384
385 { { 0x0113B970u, 0xFD34F2CEu },
386 { 0x059B5E08u, 0x51CF143Au },
387 { 0x48F4D088u, 0x4C379918u } },
388
389 { { 0x0170F175u, 0x468FB5E6u },
390 { 0x0756D8E0u, 0x774761D2u },
391 { 0x432193B7u, 0x8951FC98u } },
392
393 { { 0x43297FADu, 0x38E373FEu },
394 { 0x762514B8u, 0x29BF486Au },
395 { 0x13F04154u, 0xD69D1AE5u } },
396
397 { { 0x07A71370u, 0x45DA2A16u },
398 { 0x3BDD1190u, 0x49372802u },
399 { 0x2EEDDA93u, 0xFFD39C79u } },
400
401 { { 0x04689104u, 0xC2FD3B2Fu },
402 { 0x26955F68u, 0x35AF609Au },
403 { 0xD887E039u, 0x3C2DA6E3u } },
404
405 { { 0x37D06BB5u, 0x16CB7546u },
406 { 0x164D5E40u, 0x4F275232u },
407 { 0x5F99D04Fu, 0x5B163969u } },
408
409 { { 0x1F08260Du, 0x1AC2465Eu },
410 { 0x6B056E18u, 0x759F5CCAu },
411 { 0x4A057A3Bu, 0x24D3977Bu } },
412
413 { { 0x58402364u, 0x1ABA6176u },
414 { 0x004BD6EFu, 0x09176062u },
415 { 0x452031C1u, 0xE4FADA8Eu } },
416
417 { { 0x02581616u, 0x4629B007u },
418 { 0x480D3900u, 0x6EE762F2u },
419 { 0x7555AE39u, 0xF59B87BDu } },
420
421 { { 0x49793EBCu, 0x79B3258Fu },
422 { 0x437540C8u, 0x698F3CFAu },
423 { 0x53C55F9Cu, 0xB49FC019u } },
424
425 { { 0x4FB05E15u, 0x15AB73A7u },
426 { 0x072D43A0u, 0x77075292u },
427 { 0x7A8E7BFAu, 0x937E89A3u } },
428
429 { { 0x49E95D6Du, 0x4CA229BFu },
430 { 0x02FE5577u, 0x8117F12Au },
431 { 0xCF9C5D7Au, 0x4986ADB5u } },
432
433 { { 0x018310DCu, 0x409B26D6u },
434 { 0x1D9D5C50u, 0x18F728C2u },
435 { 0xD1ABB290u, 0x658BC778u } },
436
437 { { 0x1C587F1Cu, 0x13924FEFu },
438 { 0x30553228u, 0x6D6F295Au },
439 { 0x55CB3774u, 0xD13EF201u } },
440
441 { { 0x01010101u, 0x01010101u },
442 { 0x01234567u, 0x89ABCDEFu },
443 { 0xFA34EC48u, 0x47B268B2u } },
444
445 { { 0x1F1F1F1Fu, 0x0E0E0E0Eu },
446 { 0x01234567u, 0x89ABCDEFu },
447 { 0xA7907951u, 0x08EA3CAEu } },
448
449 { { 0xE0FEE0FEu, 0xF1FEF1FEu },
450 { 0x01234567u, 0x89ABCDEFu },
451 { 0xC39E072Du, 0x9FAC631Du } },
452
453 { { 0x00000000u, 0x00000000u },
454 { 0xFFFFFFFFu, 0xFFFFFFFFu },
455 { 0x014933E0u, 0xCDAFF6E4u } },
456
457 { { 0xFFFFFFFFu, 0xFFFFFFFFu },
458 { 0x00000000u, 0x00000000u },
459 { 0xF21E9A77u, 0xB71C49BCu } },
460
461 { { 0x01234567u, 0x89ABCDEFu },
462 { 0x00000000u, 0x00000000u },
463 { 0x24594688u, 0x5754369Au } },
464
465 { { 0xFEDCBA98u, 0x76543210u },
466 { 0xFFFFFFFFu, 0xFFFFFFFFu },
467 { 0x6B5C5A9Cu, 0x5D9E0A5Au } }
468 };
469
470 int f = 1;
471 int i;
472
473 printf("*** stage one: ");
474 fflush(stdout);
475
476 for (i = 0; i < sizeof(table) / sizeof(table[0]); i++) {
477 char kb[8], p[8], c[8];
478 blowfish_key k;
479
480 store32(kb + 0, table[i].k[0]);
481 store32(kb + 4, table[i].k[1]);
482 blowfish_setKey(&k, kb, 8);
483
484 store32(p + 0, table[i].p[0]);
485 store32(p + 4, table[i].p[1]);
486 blowfish_encrypt(&k, p, c);
487
488 if (load32(c + 0) != table[i].c[0] ||
489 load32(c + 4) != table[i].c[1]) {
490 printf("\n"
491 "!!! bad encryption\n"
492 " key = %08lx-%08lx\n"
493 " plaintext = %08lx-%08lx\n"
494 " expected ciphertext = %08lx-%08lx\n"
495 " calculated ciphertext = %08lx-%08lx\n",
496 (unsigned long)table[i].k[0],
497 (unsigned long)table[i].k[1],
498 (unsigned long)table[i].p[0],
499 (unsigned long)table[i].p[1],
500 (unsigned long)table[i].c[0],
501 (unsigned long)table[i].c[1],
502 (unsigned long)load32(c + 0),
503 (unsigned long)load32(c + 4));
504 f = 0;
505 }
506
507 blowfish_decrypt(&k, c, p);
508 if (load32(p + 0) != table[i].p[0] ||
509 load32(p + 4) != table[i].p[1]) {
510 printf("\n"
511 "!!! bad decryption\n"
512 " key = %08lx-%08lx\n"
513 " ciphertext = %08lx-%08lx\n"
514 " expected plaintext = %08lx-%08lx\n"
515 " calculated plaintext = %08lx-%08lx\n",
516 (unsigned long)table[i].k[0],
517 (unsigned long)table[i].k[1],
518 (unsigned long)table[i].c[0],
519 (unsigned long)table[i].c[1],
520 (unsigned long)table[i].p[0],
521 (unsigned long)table[i].p[1],
522 (unsigned long)load32(p + 0),
523 (unsigned long)load32(p + 4));
524 f = 0;
525 }
526
527 putchar('.');
528 fflush(stdout);
529 }
530 putchar('\n');
531 if (f)
532 printf("*** stage one ok\n");
533 }
534
535 /* --- Stage 2: key scheduling --- */
536
537 {
538 static struct {
539 uint_32 c[2];
540 } table[] = {
541 {{ 0xF9AD597Cu, 0x49DB005Eu }},
542 {{ 0xE91D21C1u, 0xD961A6D6u }},
543 {{ 0xE9C2B70Au, 0x1BC65CF3u }},
544 {{ 0xBE1E6394u, 0x08640F05u }},
545 {{ 0xB39E4448u, 0x1BDB1E6Eu }},
546 {{ 0x9457AA83u, 0xB1928C0Du }},
547 {{ 0x8BB77032u, 0xF960629Du }},
548 {{ 0xE87A244Eu, 0x2CC85E82u }},
549 {{ 0x15750E7Au, 0x4F4EC577u }},
550 {{ 0x122BA70Bu, 0x3AB64AE0u }},
551 {{ 0x3A833C9Au, 0xFFC537F6u }},
552 {{ 0x9409DA87u, 0xA90F6BF2u }},
553 {{ 0x884F8062u, 0x5060B8B4u }},
554 {{ 0x1F85031Cu, 0x19E11968u }},
555 {{ 0x79D9373Au, 0x714CA34Fu }},
556 {{ 0x93142887u, 0xEE3BE15Cu }},
557 {{ 0x03429E83u, 0x8CE2D14Bu }},
558 {{ 0xA4299E27u, 0x469FF67Bu }},
559 {{ 0xAFD5AED1u, 0xC1BC96A8u }},
560 {{ 0x10851C0Eu, 0x3858DA9Fu }},
561 {{ 0xE6F51ED7u, 0x9B9DB21Fu }},
562 {{ 0x64A6E14Au, 0xFD36B46Fu }},
563 {{ 0x80C7D7D4u, 0x5A5479ADu }},
564 {{ 0x05044B62u, 0xFA52D080u }},
565 };
566
567 unsigned char kk[] = {
568 0xF0, 0xE1, 0xD2, 0xC3, 0xB4, 0xA5, 0x96, 0x87,
569 0x78, 0x69, 0x5A, 0x4B, 0x3C, 0x2D, 0x1E, 0x0F,
570 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77
571 };
572
573 int i;
574 int f = 1;
575
576 printf("*** stage two: ");
577 fflush(stdout);
578
579 for (i = 0; i < sizeof(kk); i++) {
580 blowfish_key k;
581 unsigned char p[8] = { 0xFE, 0xDC, 0xBA, 0x98,
582 0x76, 0x54, 0x32, 0x10 };
583
584 blowfish_setKey(&k, kk, i + 1);
585 blowfish_encrypt(&k, p, p);
586
587 if (load32(p + 0) != table[i].c[0] ||
588 load32(p + 4) != table[i].c[1]) {
589 printf("!!! bad encryption\n"
590 " key length = %i\n"
591 " expected = %08lx-%08lx\n"
592 " calculated = %08lx-%08lx\n",
593 i + 1,
594 (unsigned long)table[i].c[0],
595 (unsigned long)table[i].c[1],
596 (unsigned long)load32(p + 0),
597 (unsigned long)load32(p + 4));
598 f = 0;
599 }
600
601 putchar('.');
602 fflush(stdout);
603 }
604
605 putchar('\n');
606
607 if (f)
608 printf("*** stage two ok\n");
609 }
610
611 return (0);
612
613 }
614
615 #endif
616
617 /*----- That's all, folks -------------------------------------------------*/
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