c4f2d992 |
1 | /* -*-c-*- |
2 | * |
c758e654 |
3 | * $Id: keygen.c,v 1.5 1998/01/12 16:46:05 mdw Exp $ |
c4f2d992 |
4 | * |
5 | * Key generation |
6 | * |
c758e654 |
7 | * (c) 1998 EBI |
c4f2d992 |
8 | */ |
9 | |
03f996bd |
10 | /*----- Licensing notice --------------------------------------------------* |
c4f2d992 |
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 |
03f996bd |
25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
c4f2d992 |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: keygen.c,v $ |
c758e654 |
32 | * Revision 1.5 1998/01/12 16:46:05 mdw |
33 | * Fix copyright date. |
34 | * |
27d41d48 |
35 | * Revision 1.4 1997/12/08 15:29:27 mdw |
36 | * Major update: make random number sources configurable. Generate |
37 | * warnings if there isn't enough randomness available. |
38 | * |
39 | * Revision 1.3 1997/09/17 15:29:28 mdw |
b80cbed5 |
40 | * Mix the noise from the key timings with some other environmental noise |
41 | * (obtained from `noise_acquire') for a little bit more randomness. |
42 | * |
03f996bd |
43 | * Revision 1.2 1997/08/04 10:24:23 mdw |
44 | * Sources placed under CVS control. |
45 | * |
46 | * Revision 1.1 1997/07/21 13:47:48 mdw |
c4f2d992 |
47 | * Initial revision |
48 | * |
49 | */ |
50 | |
51 | /*----- Header files ------------------------------------------------------*/ |
52 | |
53 | /* --- ANSI headers --- */ |
54 | |
55 | #include <ctype.h> |
56 | #include <errno.h> |
57 | #include <signal.h> |
58 | #include <stdio.h> |
59 | #include <stdlib.h> |
60 | #include <string.h> |
61 | |
62 | /* --- Unix headers --- */ |
63 | |
64 | #include <sys/types.h> |
65 | #include <sys/time.h> |
66 | #include <fcntl.h> |
67 | |
68 | #include <termios.h> |
69 | #include <unistd.h> |
70 | |
71 | /* --- Local headers --- */ |
72 | |
73 | #include "config.h" |
c4f2d992 |
74 | #include "mdwopt.h" |
b80cbed5 |
75 | #include "noise.h" |
76 | #include "rand.h" |
77 | #include "tx.h" |
c4f2d992 |
78 | #include "utils.h" |
79 | |
80 | /*----- Static variables --------------------------------------------------*/ |
81 | |
82 | static struct termios kg__raw, kg__old; /* Terminal settings */ |
83 | static int kg__tty; /* File handle for the terminal */ |
84 | static FILE *kg__ttyfp; /* Stream pointer for terminal */ |
85 | static unsigned int kg__flags; /* Various interesting flags */ |
86 | |
87 | enum { |
88 | kgFlag__cbreak = 1 /* Terminal is in cbreak mode */ |
89 | }; |
90 | |
91 | /*----- Main code ---------------------------------------------------------*/ |
92 | |
93 | /* --- @kg__cbreak@ --- * |
94 | * |
95 | * Arguments: --- |
96 | * |
97 | * Returns: --- |
98 | * |
99 | * Use: Makes the terminal return characters as soon as they're |
100 | * asked for. |
101 | */ |
102 | |
103 | void kg__cbreak(void) |
104 | { |
105 | /* --- Don't do this if I don't have to --- */ |
106 | |
107 | if (kg__flags & kgFlag__cbreak) |
108 | return; |
109 | |
110 | /* --- Fetch the old attributes, and remember them --- */ |
111 | |
112 | if (tcgetattr(kg__tty, &kg__old)) |
113 | die("couldn't read terminal attributes: %s", strerror(errno)); |
114 | memcpy(&kg__raw, &kg__old, sizeof(kg__raw)); |
115 | |
116 | /* --- Now modify them for raw mode --- */ |
117 | |
118 | kg__raw.c_lflag &= ~(ICANON | ECHO); |
119 | kg__raw.c_cc[VTIME] = 0; |
120 | kg__raw.c_cc[VMIN] = 1; |
121 | |
122 | /* --- Remember the new state, and away we go --- */ |
123 | |
124 | kg__flags |= kgFlag__cbreak; |
125 | if (tcsetattr(kg__tty, TCSAFLUSH, &kg__raw)) |
126 | die("couldn't set terminal attributes: %s", strerror(errno)); |
127 | } |
128 | |
129 | /* --- @kg__crepair@ --- * |
130 | * |
131 | * Arguments: --- |
132 | * |
133 | * Returns: --- |
134 | * |
135 | * Use: Unbreaks a cbroken tty. Obvious, innit? |
136 | */ |
137 | |
138 | static void kg__crepair(void) |
139 | { |
140 | /* --- Don't do this if I don't have to --- */ |
141 | |
142 | if (~kg__flags & kgFlag__cbreak) |
143 | return; |
144 | |
145 | /* --- Reset the old attributes --- */ |
146 | |
147 | tcsetattr(kg__tty, TCSAFLUSH, &kg__old); |
148 | kg__flags &= ~kgFlag__cbreak; |
149 | } |
150 | |
151 | /* --- @kg__signal@ --- * |
152 | * |
153 | * Arguments: @int sig@ = signal number |
154 | * |
155 | * Returns: --- |
156 | * |
157 | * Use: Tidies up if I get a signal. |
158 | */ |
159 | |
160 | static void kg__signal(int sig) |
161 | { |
162 | kg__crepair(); |
163 | signal(sig, SIG_DFL); |
164 | raise(sig); |
165 | } |
166 | |
167 | /* --- @kgFmt__binary@ --- * |
168 | * |
169 | * Arguments: @unsigned char *k@ = pointer to key buffer |
170 | * @size_t bits@ = number of bits to write |
171 | * @FILE *fp@ = stream to write on |
172 | * |
173 | * Returns: --- |
174 | * |
175 | * Use: Writes bits on a stream. |
176 | */ |
177 | |
178 | static void kgFmt__binary(unsigned char *k, size_t bits, FILE *fp) |
179 | { |
180 | fwrite(k, 1, bits / 8, fp); |
181 | } |
182 | |
183 | /* --- @kgFmt__base64@ --- * |
184 | * |
185 | * Arguments: @unsigned char *k@ = pointer to key buffer |
186 | * @size_t bits@ = number of bits to write |
187 | * @FILE *fp@ = stream to write on |
188 | * |
189 | * Returns: --- |
190 | * |
191 | * Use: Writes bits on a stream in an encoded way. |
192 | */ |
193 | |
194 | static void kgFmt__base64(unsigned char *k, size_t bits, FILE *fp) |
195 | { |
196 | static const char xlt[64] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
197 | "abcdefghijklmnopqrstuvwxyz" |
198 | "0123456789+/" }; |
199 | unsigned long b; |
200 | int ll = 0; |
201 | |
202 | while (bits > 24) { |
203 | b = ((k[0] & 0xffu) << 16) | ((k[1] & 0xffu) << 8) | (k[2] & 0xffu); |
204 | k += 3; |
205 | bits -= 24; |
206 | putc(xlt[(b >> 18) & 0x3fu], fp); |
207 | putc(xlt[(b >> 12) & 0x3fu], fp); |
208 | putc(xlt[(b >> 6) & 0x3fu], fp); |
209 | putc(xlt[(b >> 0) & 0x3fu], fp); |
210 | if ((ll += 4) > 70) { |
211 | putc('\n', fp); |
212 | ll = 0; |
213 | } |
214 | } |
215 | |
216 | b = 0; |
217 | switch (bits) { |
218 | case 24: |
219 | b = *k++ & 0xffu; |
220 | case 16: |
221 | b = (b << 8) | (*k++ & 0xffu); |
222 | case 8: |
223 | b = (b << 8) | (*k++ & 0xffu); |
224 | } |
225 | b <<= (24 - bits); |
226 | putc(xlt[(b >> 18) & 0x3fu], fp); |
227 | putc(xlt[(b >> 12) & 0x3fu], fp); |
228 | switch (bits) { |
229 | case 24: |
230 | putc(xlt[(b >> 6) & 0x3fu], fp); |
231 | putc(xlt[(b >> 0) & 0x3fu], fp); |
232 | break; |
233 | case 16: |
234 | putc(xlt[(b >> 6) & 0x3fu], fp); |
235 | putc('=', fp); |
236 | break; |
237 | case 8: |
238 | fputs("==", fp); |
239 | break; |
240 | } |
241 | |
242 | putc('\n', fp); |
243 | } |
244 | |
245 | /* --- @kg__gen@ --- * |
246 | * |
247 | * Arguments: @unsigned char *ui@ = pointer to array to fill in |
248 | * @size_t sz@ = number of bits to generate |
249 | * |
250 | * Returns: --- |
251 | * |
252 | * Use: Uses key timings to generate random numbers. Maybe. |
253 | */ |
254 | |
255 | static void kg__gen(unsigned char *ui, size_t sz) |
256 | { |
257 | int bits = 32 < sz ? 32 : sz; |
258 | size_t wsz = (sz + 31u) & ~31u; |
259 | unsigned long last, ldiff = 0; |
260 | unsigned long a = 0; |
261 | unsigned long fact = 1000000 / CLOCKS_PER_SEC; |
262 | |
263 | fprintf(kg__ttyfp, |
03f996bd |
264 | "I need to get %lu random bits; I'll do this by timing your keypresses.\n" |
c4f2d992 |
265 | "Please type some arbitrary text until I say `done'.\n", |
03f996bd |
266 | (unsigned long)sz); |
c4f2d992 |
267 | |
268 | { |
269 | struct timeval tv; |
270 | gettimeofday(&tv, 0); |
271 | last = tv.tv_usec / fact + tv.tv_sec * fact; |
272 | } |
273 | |
274 | while (sz) { |
275 | int useful; |
276 | uint_32 orr, xor; |
277 | |
278 | /* --- Print current status --- */ |
279 | |
03f996bd |
280 | fprintf(kg__ttyfp, "\r%5lu...", (unsigned long)sz); |
c4f2d992 |
281 | fflush(kg__ttyfp); |
282 | |
283 | /* --- Read the next character --- */ |
284 | |
285 | { |
286 | char buff[16]; |
287 | if (read(kg__tty, buff, sizeof(buff)) < 0) |
288 | die("couldn't read from terminal: %s", strerror(errno)); |
289 | } |
290 | |
291 | /* --- Fiddle with times --- * |
292 | * |
293 | * Read the time now. Turn it into 32 bits of useful information, and |
294 | * find the difference between that and the previous time. Compare this |
295 | * with the difference between the previous pair of keypresses. |
296 | */ |
297 | |
298 | { |
299 | struct timeval tv; |
300 | uint_32 n, nd; |
301 | |
302 | gettimeofday(&tv, 0); |
303 | n = tv.tv_usec / fact + tv.tv_sec * fact; |
304 | if (!ldiff) { |
305 | ldiff = n - last; |
306 | last = n; |
307 | continue; |
308 | } |
309 | nd = n - last; |
310 | orr = nd | ldiff; |
311 | xor = nd ^ ldiff; |
312 | D( printf("\nlast = %08lx, next = %08lx, ldiff = %08lx, nd = %08lx\n", |
313 | (unsigned long)last, (unsigned long)n, |
314 | (unsigned long)ldiff, (unsigned long)nd); |
315 | printf("xor = %08lx\n", (unsigned long)xor); ) |
316 | ldiff = nd; |
317 | last = n; |
318 | } |
319 | |
320 | /* --- Find the useful bits in this value --- * |
321 | * |
322 | * Find the least significant set bit in @bowl@ and chop it off. Then |
323 | * find the most significant set bit and chop that off two. The rest is |
324 | * probably interesting. |
325 | */ |
326 | |
327 | { |
328 | unsigned long i; |
329 | |
330 | if (!orr || !xor) |
331 | continue; /* erk! */ |
332 | |
333 | useful = 30; |
334 | |
335 | i = 0x80000000ul; |
336 | if (xor & i) { |
337 | while (i && (xor & i) != 0) { |
338 | i >>= 1; |
339 | useful--; |
340 | } |
341 | } else { |
342 | while (i && (xor & i) == 0) { |
343 | i >>= 1; |
344 | useful--; |
345 | } |
346 | } |
347 | xor &= ~-i; |
348 | |
349 | while ((orr & 1) == 0) { |
350 | useful--; |
351 | orr >>= 1; |
352 | xor >>= 1; |
353 | } |
354 | xor >>= 1; |
355 | |
356 | if (useful < 1) |
357 | continue; |
358 | } |
359 | |
360 | /* --- Now add the bits in the mixing bowl to my stash --- * |
361 | * |
362 | * There are two cases: |
363 | * |
364 | * 1. I have more bits than will fit into the accumulator. Then I must |
365 | * put as many bits into the accumulator as will fit, store the |
366 | * accumulator, and remove the spent bits. |
367 | * |
368 | * 2. I have too few bits to fit in the accumulator. Then shift them |
369 | * in and return. |
370 | */ |
371 | |
372 | while (sz && useful) { |
373 | |
374 | D( printf("got %i bits, need %i/%i: %8lx\n", |
375 | useful, bits, sz, (unsigned long)xor); ) |
376 | |
377 | if (useful >= bits) { |
378 | |
379 | D( printf("shifted acc = %08lx\n" |
380 | " new bits = %08lx\n" |
381 | " result = %08lx\n", |
382 | (unsigned long)(a << bits), |
383 | (unsigned long)(xor >> (useful - bits)), |
384 | (unsigned long)((a << bits) | (xor >> (useful - bits)))); ) |
385 | |
386 | a = (a << bits) | (xor >> (useful - bits)); |
387 | |
388 | sz -= bits; |
389 | wsz -= bits; |
390 | useful -= bits; |
391 | |
392 | if (sz == 0) { |
393 | a <<= wsz; |
394 | bits = 32 - wsz; |
395 | } else |
396 | bits = 32; |
397 | |
398 | while (bits > 0) { |
399 | D( printf("writing %02x\n", (a >> 24) & 0xffu); ) |
400 | *ui++ = (a >> 24) & 0xffu; |
401 | a <<= 8; |
402 | bits -= 8; |
403 | } |
404 | a = 0; |
405 | |
406 | bits = 32 < sz ? 32 : sz; |
407 | |
408 | } else { |
409 | |
410 | D( printf("shifted acc = %08lx\n" |
411 | " new bits = %08lx\n" |
412 | " result = %08lx\n", |
413 | (unsigned long)(a << useful), |
414 | (unsigned long)(xor), |
415 | (unsigned long)((a << useful) | (xor))); ) |
416 | a = (a << useful) | xor; |
417 | bits -= useful; |
418 | sz -= useful; |
419 | wsz -= useful; |
420 | useful = 0; |
421 | } |
422 | } |
423 | } |
424 | |
425 | fputs("\rDone! \n", kg__ttyfp); |
426 | putc('\a', kg__ttyfp); fflush(kg__ttyfp); |
427 | sleep(1); |
428 | } |
429 | |
430 | /* --- @main@ --- * |
431 | * |
432 | * Arguments: @int argc@ = number of arguments |
433 | * @char *argv[]@ = array of arguments |
434 | * |
435 | * Returns: Zero if it worked, nonzero if it didn't. |
436 | * |
437 | * Use: Generates random numbers from the keyboard. |
438 | */ |
439 | |
440 | int main(int argc, char *argv[]) |
441 | { |
442 | unsigned char *uip; |
443 | size_t sz = 128; |
27d41d48 |
444 | size_t keybits = 0; |
445 | unsigned f = 0; |
c4f2d992 |
446 | const char *file = 0; |
447 | FILE *fp; |
448 | |
27d41d48 |
449 | enum { |
450 | f_envNoise = 1, |
451 | f_keyTimer = 2 |
452 | }; |
453 | |
c4f2d992 |
454 | /* --- Formats table --- */ |
455 | |
456 | static struct { |
457 | const char *name; |
458 | void (*proc)(unsigned char *k, size_t bits, FILE *fp); |
459 | } format[] = { |
460 | { "tx", tx_putBits }, |
461 | { "hex", tx_putBits }, |
462 | { "binary", kgFmt__binary }, |
463 | { "base64", kgFmt__base64 }, |
464 | { 0, 0 } |
465 | }; |
466 | |
467 | void (*fmt)(unsigned char *, size_t, FILE *) = tx_putBits; |
468 | |
469 | /* --- Explain who I am --- */ |
470 | |
471 | ego(argv[0]); |
472 | |
27d41d48 |
473 | f |= f_envNoise | f_keyTimer; |
474 | |
c4f2d992 |
475 | /* --- Read arguments --- */ |
476 | |
477 | for (;;) { |
478 | static struct option opts[] = { |
27d41d48 |
479 | { "help", 0, 0, 'h' }, |
480 | { "bits", gFlag_argReq, 0, 'b' }, |
481 | { "output", gFlag_argReq, 0, 'o' }, |
482 | { "format", gFlag_argReq, 0, 'f' }, |
483 | { "key-times", gFlag_negate|gFlag_argOpt, 0, 'k' }, |
484 | { "env-noise", gFlag_negate, 0, 'e' }, |
485 | { 0, 0, 0, 0 } |
c4f2d992 |
486 | }; |
487 | |
27d41d48 |
488 | int i = mdwopt(argc, argv, "hb:o:f:k+::e+", opts, 0, 0, gFlag_negation); |
c4f2d992 |
489 | |
490 | if (i < 0) |
491 | break; |
492 | switch (i) { |
493 | case 'h': |
494 | printf("" |
27d41d48 |
495 | "Usage: %s [-h] [-|+ek] [-b BITS] [-o FILE] [-f FORMAT]\n" |
c4f2d992 |
496 | "\n" |
27d41d48 |
497 | "Generates BITS (by default, 128) random bits. The resulting number is\n" |
498 | "written to FILE, or standard output.\n\n" |
499 | "Randomness is taken from key-timings and environmental noise, although\n" |
500 | "you can disable either (or both) of these sources.\n\n" |
501 | "Options provided are:\n\n" |
502 | "-h, --help Display this help text\n" |
503 | "-b, --bits=BITS\t Generate BITS random bits instead of 128\n" |
504 | "-o, --output=FILE Write bits to FILE, not standard output\n" |
505 | "-f, --format=FORMAT Write bits in FORMAT:\n" |
506 | " tx, hex Hexadecimal\n" |
507 | " binary Raw binary\n" |
508 | " base64 Base64-encoded binary\n" |
509 | "-e, --[no-]env-noise Do [not] read environmental noise\n" |
510 | "-k, --[no-]key-times[=BITS] Do [not] read key timing information\n" |
511 | " (only read BITS bits from key timings)\n", |
c4f2d992 |
512 | quis()); |
513 | exit(0); |
514 | break; |
515 | case 'b': |
516 | sz = atoi(optarg); |
517 | if (sz == 0) |
518 | die("bad number of bits (illegible or zero)"); |
519 | if (sz % 8) |
520 | die("can only generate a whole number of 8-bit bytes"); |
521 | break; |
522 | case 'o': |
523 | file = optarg; |
524 | break; |
525 | case 'f': |
526 | fmt = 0; |
527 | for (i = 0; format[i].name; i++) { |
528 | const char *p = format[i].name, *q = optarg; |
529 | for (;;) { |
530 | if (*q == 0) |
531 | break; |
532 | if (*p != *q) |
533 | break; |
534 | p++, q++; |
535 | } |
536 | if (!*q) { |
537 | if (fmt) |
538 | die("ambiguous format name: `%s'", optarg); |
539 | fmt = format[i].proc; |
540 | } |
541 | } |
542 | if (!fmt) |
543 | die("unknown format name: `%s'", optarg); |
544 | break; |
27d41d48 |
545 | case 'e': |
546 | f |= f_envNoise; |
547 | break; |
548 | case 'e' | gFlag_negated: |
549 | f &= ~f_envNoise; |
550 | break; |
551 | case 'k': |
552 | f |= f_keyTimer; |
553 | if (optarg) { |
554 | keybits = atoi(optarg); |
555 | if (keybits == 0) |
556 | die("bad number of bits (illegible or zero)"); |
557 | if (keybits % 8) |
558 | die("bad number of bits (must be multiple of 8)"); |
559 | } |
560 | else |
561 | keybits = 0; |
562 | break; |
563 | case 'k' | gFlag_negated: |
564 | f &= ~f_keyTimer; |
565 | break; |
c4f2d992 |
566 | case '?': |
567 | exit(1); |
568 | break; |
569 | } |
570 | } |
571 | |
27d41d48 |
572 | /* --- Check the sanity of this request --- */ |
573 | |
574 | { |
575 | size_t bits = 0; |
576 | |
577 | if (f & f_keyTimer) { |
578 | if (!keybits) |
579 | keybits = sz; |
580 | bits += keybits; |
581 | } |
582 | if (f & f_envNoise) |
583 | bits += 384; /* Estimate */ |
584 | |
585 | if (bits == 0) |
586 | die("no randomness sources given"); |
587 | if (bits < sz) |
588 | moan("warning: randomness may not be sufficiently high"); |
589 | } |
590 | |
c4f2d992 |
591 | if (optind < argc) { |
27d41d48 |
592 | fprintf(stderr, "Usage: %s [-opts]\n", quis()); |
c4f2d992 |
593 | exit(1); |
594 | } |
595 | |
596 | /* --- Allocate memory --- */ |
597 | |
27d41d48 |
598 | { |
599 | size_t buff = sz / 8; |
600 | if (f & f_keyTimer && keybits > sz) |
601 | buff = keybits / 8; |
602 | uip = xmalloc(buff); |
603 | } |
604 | |
605 | rand_clear(); |
606 | |
607 | /* --- Fetch randomness from key timings --- */ |
608 | |
609 | if (f & f_keyTimer) { |
610 | |
611 | /* --- Open the terminal --- * |
612 | * |
613 | * I'd like to be able to @fprintf@ to the terminal, so use @fopen@. |
614 | */ |
615 | |
616 | if ((kg__ttyfp = fopen("/dev/tty", "r+")) == 0) |
617 | die("couldn't open terminal: %s", strerror(errno)); |
618 | kg__tty = fileno(kg__ttyfp); |
c4f2d992 |
619 | |
27d41d48 |
620 | /* --- Tidy up nicely if I die --- */ |
c4f2d992 |
621 | |
27d41d48 |
622 | signal(SIGINT, kg__signal); |
623 | signal(SIGTERM, kg__signal); |
624 | atexit(kg__crepair); |
625 | |
626 | /* --- Put the terminal into cbreak, read the key, and restore --- */ |
627 | |
628 | kg__cbreak(); |
629 | kg__gen(uip, keybits); |
630 | kg__crepair(); |
631 | rand_add(uip, keybits / 8); |
632 | rand_churn(); |
633 | } |
634 | |
635 | /* --- Find some noise from the environment too --- */ |
636 | |
637 | if (f & f_envNoise) { |
638 | noise_acquire(); |
639 | rand_churn(); |
640 | } |
641 | |
642 | /* --- Now write the number and exit --- */ |
643 | |
644 | rand_extract(uip, sz / 8); |
645 | D( fputs("*** ", fp); tx_putBits(uip, sz, stdout); ) |
c4f2d992 |
646 | |
647 | /* --- Open the output file, if one is specified --- */ |
648 | |
649 | if (file) { |
650 | int fd; |
651 | |
652 | /* --- Open the file oddly --- * |
653 | * |
654 | * There's a good reason for this. I want to be able to @fprintf@ (for |
655 | * the benefit of @tx_putWords@ mainly) but I also want to ensure that |
656 | * only the user has read permissions for the file. So I'll use @open@ |
27d41d48 |
657 | * with an appropriate mode and then @fdopen@ the file descriptor to |
658 | * get a stream. Yuk. |
c4f2d992 |
659 | */ |
660 | |
661 | if ((fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) |
662 | die("couldn't open output file: %s", strerror(errno)); |
663 | if ((fp = fdopen(fd, "w")) == 0) |
664 | die("couldn't attach stream to output file: %s", strerror(errno)); |
665 | } else |
666 | fp = stdout; |
667 | |
c4f2d992 |
668 | fmt(uip, sz, fp); |
669 | if (file) |
670 | fclose(fp); |
671 | memset(uip, 0, sz / 8); /* Burn temporary buffer */ |
b80cbed5 |
672 | rand_clear(); |
c4f2d992 |
673 | return (0); |
674 | } |
675 | |
676 | /*----- That's all, folks -------------------------------------------------*/ |