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