5c3f75ec |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: catcrypt.c,v 1.1 2004/04/17 09:58:36 mdw Exp $ |
4 | * |
5 | * Command-line encryption tool |
6 | * |
7 | * (c) 2004 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
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. |
18 | * |
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. |
23 | * |
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, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include "config.h" |
33 | |
34 | #include <errno.h> |
35 | #include <stdio.h> |
36 | #include <stdlib.h> |
37 | #include <string.h> |
38 | |
39 | #include <mLib/base64.h> |
40 | #include <mLib/dstr.h> |
41 | #include <mLib/mdwopt.h> |
42 | #include <mLib/quis.h> |
43 | #include <mLib/report.h> |
44 | #include <mLib/sub.h> |
45 | |
46 | #include "buf.h" |
47 | #include "rand.h" |
48 | #include "noise.h" |
49 | #include "mprand.h" |
50 | #include "key.h" |
51 | #include "cc.h" |
52 | |
53 | /*----- Utilities ---------------------------------------------------------*/ |
54 | |
55 | /* --- @keyreport@ --- * |
56 | * |
57 | * Arguments: @const char *file@ = filename containing the error |
58 | * @int line@ = line number in file |
59 | * @const char *err@ = error text message |
60 | * @void *p@ = unimportant pointer |
61 | * |
62 | * Returns: --- |
63 | * |
64 | * Use: Reports errors during the opening of a key file. |
65 | */ |
66 | |
67 | static void keyreport(const char *file, int line, const char *err, void *p) |
68 | { |
69 | moan("error in keyring `%s' at line `%s': %s", file, line, err); |
70 | } |
71 | |
72 | /*----- Static variables --------------------------------------------------*/ |
73 | |
74 | static const char *keyring = "keyring"; |
75 | |
76 | /*----- Data format -------------------------------------------------------*/ |
77 | |
78 | /* --- Overview --- * |
79 | * |
80 | * The encrypted message is divided into chunks, each preceded by a two-octet |
81 | * length. The chunks don't need to be large -- the idea is that we can |
82 | * stream the chunks in and out. |
83 | * |
84 | * The first chunk is a header. It contains the decryption key-id, and maybe |
85 | * the verification key-id if the message is signed. |
86 | * |
87 | * Next comes the key-encapsulation chunk. This is decrypted in some |
88 | * KEM-specific way to yield a secret hash. This hash is what is signed if |
89 | * the message is signed. The hash is expanded using an MGF (or similar) to |
90 | * make a symmetric encryption and MAC key. |
91 | * |
92 | * If the message is signed, there comes a signature chunk. The signature is |
93 | * on the secret hash. This means that the recipient can modify the message |
94 | * and still have a valid signature, so it's not useful for proving things to |
95 | * other people; but it also means that the recipient knows that the message |
96 | * is from someone who knows the hash, which limits the possiblities to (a) |
97 | * whoever encrypted the message (good!) and (b) whoever knows the |
98 | * recipient's private key. |
99 | * |
100 | * Then come message chunks. Each one begins with a MAC over an implicit |
101 | * sequence number and the ciphertext. The final chunk's ciphertext is |
102 | * empty; no other chunk is empty. Thus can the correct end-of-file be |
103 | * discerned. |
104 | */ |
105 | |
106 | /*----- Chunk I/O ---------------------------------------------------------*/ |
107 | |
108 | static void chunk_write(enc *e, buf *b) |
109 | { |
110 | octet l[2]; |
111 | size_t n = BLEN(b); |
112 | assert(n <= MASK16); |
113 | STORE16(l, n); |
114 | if (e->ops->write(e, l, 2) || |
115 | e->ops->write(e, BBASE(b), BLEN(b))) |
116 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
117 | } |
118 | |
119 | static void chunk_read(enc *e, dstr *d, buf *b) |
120 | { |
121 | octet l[2]; |
122 | size_t n; |
123 | |
124 | dstr_reset(d); |
125 | errno = 0; |
126 | if (e->ops->read(e, l, 2) != 2) |
127 | goto err; |
128 | n = LOAD16(l); |
129 | dstr_ensure(d, n); |
130 | if (e->ops->read(e, d->buf, n) != n) |
131 | goto err; |
132 | d->len = n; |
133 | buf_init(b, d->buf, d->len); |
134 | return; |
135 | |
136 | err: |
137 | if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); |
138 | else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
139 | } |
140 | |
141 | /*----- Encryption --------------------------------------------------------*/ |
142 | |
143 | static int encrypt(int argc, char *argv[]) |
144 | { |
145 | const char *of = 0, *kn = "ccrypt"; |
146 | FILE *ofp = 0; |
147 | FILE *fp = 0; |
148 | const char *ef = "binary"; |
149 | const char *err; |
150 | int i; |
151 | size_t n; |
152 | dstr d = DSTR_INIT; |
153 | octet *tag, *ct; |
154 | buf b; |
155 | size_t seq; |
156 | char bb[16384]; |
157 | unsigned f = 0; |
158 | key_file kf; |
159 | key *k; |
160 | kem *km; |
161 | gcipher *cx, *c; |
162 | gmac *m; |
163 | ghash *h; |
164 | const encops *eo; |
165 | enc *e; |
166 | |
167 | #define f_bogus 1u |
168 | |
169 | for (;;) { |
170 | static const struct option opt[] = { |
171 | { "key", OPTF_ARGREQ, 0, 'k' }, |
172 | { "armour", 0, 0, 'a' }, |
173 | { "armor", 0, 0, 'a' }, |
174 | { "format", OPTF_ARGREQ, 0, 'f' }, |
175 | { "output", OPTF_ARGREQ, 0, 'o' }, |
176 | { 0, 0, 0, 0 } |
177 | }; |
178 | i = mdwopt(argc, argv, "k:af:o:", opt, 0, 0, 0); |
179 | if (i < 0) break; |
180 | switch (i) { |
181 | case 'k': kn = optarg; break; |
182 | case 'a': ef = "pem"; break; |
183 | case 'f': ef = optarg; break; |
184 | case 'o': of = optarg; break; |
185 | default: f |= f_bogus; break; |
186 | } |
187 | } |
188 | if (argc - optind > 1 || (f & f_bogus)) |
189 | die(EXIT_FAILURE, "Usage: encrypt [-options] [file]"); |
190 | |
191 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
192 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
193 | if ((k = key_bytag(&kf, kn)) == 0) |
194 | die(EXIT_FAILURE, "key `%s' not found", kn); |
195 | |
196 | if ((eo = getenc(ef)) == 0) |
197 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
198 | |
199 | if (optind == argc) |
200 | fp = stdin; |
201 | else if (strcmp(argv[optind], "-") == 0) { |
202 | fp = stdin; |
203 | optind++; |
204 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { |
205 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
206 | argv[optind], strerror(errno)); |
207 | } else |
208 | optind++; |
209 | |
210 | if (!of || strcmp(of, "-") == 0) |
211 | ofp = stdout; |
212 | else if ((ofp = fopen(of, eo->wmode)) == 0) { |
213 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
214 | ofp, strerror(errno)); |
215 | } |
216 | |
217 | key_fulltag(k, &d); |
218 | e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE", 1); |
219 | km = getkem(k, "ccrypt", 0); |
220 | if ((err = km->ops->check(km)) != 0) |
221 | moan("key `%s' fails check: %s", d.buf, err); |
222 | |
223 | /* --- Build the header chunk --- */ |
224 | |
225 | dstr_reset(&d); |
226 | dstr_ensure(&d, 256); |
227 | buf_init(&b, d.buf, 256); |
228 | buf_putu32(&b, k->id); |
229 | assert(BOK(&b)); |
230 | chunk_write(e, &b); |
231 | |
232 | /* --- Build the KEM chunk --- */ |
233 | |
234 | dstr_reset(&d); |
235 | if (setupkem(km, &d, &cx, &c, &m)) |
236 | die(EXIT_FAILURE, "failed to encapsulate key"); |
237 | buf_init(&b, d.buf, d.len); |
238 | BSTEP(&b, d.len); |
239 | chunk_write(e, &b); |
240 | |
241 | /* --- Now do the main crypto --- */ |
242 | |
243 | assert(GC_CLASS(c)->blksz <= sizeof(bb)); |
244 | dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); |
245 | seq = 0; |
246 | for (;;) { |
247 | h = GM_INIT(m); |
248 | STORE32(bb, seq); |
249 | GH_HASH(h, bb, 4); |
250 | seq++; |
251 | if (GC_CLASS(c)->blksz) { |
252 | GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); |
253 | GC_SETIV(c, bb); |
254 | } |
255 | n = fread(bb, 1, sizeof(bb), fp); |
256 | if (!n) break; |
257 | buf_init(&b, d.buf, d.sz); |
258 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
259 | ct = buf_get(&b, n); |
260 | assert(tag); assert(ct); |
261 | GC_ENCRYPT(c, bb, ct, n); |
262 | GH_HASH(h, ct, n); |
263 | GH_DONE(h, tag); |
264 | GH_DESTROY(h); |
265 | chunk_write(e, &b); |
266 | } |
267 | |
268 | /* --- Final terminator packet --- */ |
269 | |
270 | buf_init(&b, d.buf, d.sz); |
271 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
272 | assert(tag); |
273 | GH_DONE(h, tag); |
274 | GH_DESTROY(h); |
275 | chunk_write(e, &b); |
276 | |
277 | /* --- All done --- */ |
278 | |
279 | e->ops->encdone(e); |
280 | GM_DESTROY(m); |
281 | GC_DESTROY(c); |
282 | GC_DESTROY(cx); |
283 | freeenc(e); |
284 | freekem(km); |
285 | if (of) fclose(ofp); |
286 | key_close(&kf); |
287 | dstr_destroy(&d); |
288 | return (0); |
289 | |
290 | #undef f_bogus |
291 | } |
292 | |
293 | /*---- Decryption ---------------------------------------------------------*/ |
294 | |
295 | static int decrypt(int argc, char *argv[]) |
296 | { |
297 | const char *of = 0; |
298 | FILE *ofp = 0; |
299 | FILE *fp = 0; |
300 | const char *ef = "binary"; |
301 | int i; |
302 | dstr d = DSTR_INIT; |
303 | buf b; |
304 | key_file kf; |
305 | size_t seq; |
306 | uint32 id; |
307 | key *k; |
308 | kem *km; |
309 | gcipher *cx; |
310 | gcipher *c; |
311 | ghash *h; |
312 | gmac *m; |
313 | octet *tag; |
314 | unsigned f = 0; |
315 | const encops *eo; |
316 | enc *e; |
317 | |
318 | #define f_bogus 1u |
319 | |
320 | for (;;) { |
321 | static const struct option opt[] = { |
322 | { "armour", 0, 0, 'a' }, |
323 | { "armor", 0, 0, 'a' }, |
324 | { "format", OPTF_ARGREQ, 0, 'f' }, |
325 | { "output", OPTF_ARGREQ, 0, 'o' }, |
326 | { 0, 0, 0, 0 } |
327 | }; |
328 | i = mdwopt(argc, argv, "af:o:", opt, 0, 0, 0); |
329 | if (i < 0) break; |
330 | switch (i) { |
331 | case 'a': ef = "pem"; break; |
332 | case 'f': ef = optarg; break; |
333 | case 'o': of = optarg; break; |
334 | default: f |= f_bogus; break; |
335 | } |
336 | } |
337 | if (argc - optind > 1 || (f & f_bogus)) |
338 | die(EXIT_FAILURE, "Usage: decrypt [-options] [file]"); |
339 | |
340 | if ((eo = getenc(ef)) == 0) |
341 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
342 | |
343 | if (optind == argc) |
344 | fp = stdin; |
345 | else if (strcmp(argv[optind], "-") == 0) { |
346 | fp = stdin; |
347 | optind++; |
348 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { |
349 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
350 | argv[optind], strerror(errno)); |
351 | } else |
352 | optind++; |
353 | |
354 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
355 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
356 | |
357 | e = initenc(eo, fp, "CATCRYPT ENCRYPTED MESSAGE", 0); |
358 | |
359 | /* --- Read the header chunk --- */ |
360 | |
361 | chunk_read(e, &d, &b); |
362 | if (buf_getu32(&b, &id)) |
363 | die(EXIT_FAILURE, "malformed header: missing keyid"); |
364 | if (BLEFT(&b)) |
365 | die(EXIT_FAILURE, "malformed header: junk at end"); |
366 | |
367 | /* --- Find the key --- */ |
368 | |
369 | if ((k = key_byid(&kf, id)) == 0) |
370 | die(EXIT_FAILURE, "key id %08lx not found", (unsigned long)id); |
371 | km = getkem(k, "ccrypt", 1); |
372 | |
373 | /* --- Read the KEM chunk --- */ |
374 | |
375 | chunk_read(e, &d, &b); |
376 | if (setupkem(km, &d, &cx, &c, &m)) |
377 | die(EXIT_FAILURE, "failed to decapsulate key"); |
378 | |
379 | /* --- Now decrypt the main body --- */ |
380 | |
381 | if (!of || strcmp(of, "-") == 0) |
382 | ofp = stdout; |
383 | else if ((ofp = fopen(of, "wb")) == 0) { |
384 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
385 | ofp, strerror(errno)); |
386 | } |
387 | |
388 | seq = 0; |
389 | dstr_ensure(&d, GC_CLASS(c)->blksz); |
390 | dstr_ensure(&d, 4); |
391 | for (;;) { |
392 | if (GC_CLASS(c)->blksz) { |
393 | GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); |
394 | GC_SETIV(c, d.buf); |
395 | } |
396 | h = GM_INIT(m); |
397 | STORE32(d.buf, seq); |
398 | GH_HASH(h, d.buf, 4); |
399 | seq++; |
400 | chunk_read(e, &d, &b); |
401 | if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) |
402 | die(EXIT_FAILURE, "bad ciphertext chunk: no tag"); |
403 | GH_HASH(h, BCUR(&b), BLEFT(&b)); |
404 | if (memcmp(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz) != 0) |
405 | die(EXIT_FAILURE, "bad ciphertext chunk: authentication failure"); |
406 | if (!BLEFT(&b)) |
407 | break; |
408 | GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); |
409 | if (fwrite(BCUR(&b), 1, BLEFT(&b), ofp) != BLEFT(&b)) |
410 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
411 | } |
412 | |
413 | if (fflush(ofp) || ferror(ofp)) |
414 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
415 | |
416 | e->ops->decdone(e); |
417 | freeenc(e); |
418 | GC_DESTROY(c); |
419 | GC_DESTROY(cx); |
420 | GM_DESTROY(m); |
421 | freekem(km); |
422 | if (of) fclose(ofp); |
423 | key_close(&kf); |
424 | dstr_destroy(&d); |
425 | return (0); |
426 | |
427 | #undef f_bogus |
428 | } |
429 | |
430 | /*----- Test code ---------------------------------------------------------*/ |
431 | |
432 | static int encode(int argc, char *argv[]) |
433 | { |
434 | const char *of = 0; |
435 | FILE *ofp = 0; |
436 | FILE *fp = 0; |
437 | const char *ef = "binary"; |
438 | const char *bd = "MESSAGE"; |
439 | int i; |
440 | size_t n; |
441 | char buf[4096]; |
442 | unsigned f = 0; |
443 | const encops *eo; |
444 | enc *e; |
445 | |
446 | #define f_bogus 1u |
447 | |
448 | for (;;) { |
449 | static const struct option opt[] = { |
450 | { "format", OPTF_ARGREQ, 0, 'f' }, |
451 | { "boundary", OPTF_ARGREQ, 0, 'b' }, |
452 | { "output", OPTF_ARGREQ, 0, 'o' }, |
453 | { 0, 0, 0, 0 } |
454 | }; |
455 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); |
456 | if (i < 0) break; |
457 | switch (i) { |
458 | case 'f': ef = optarg; break; |
459 | case 'b': bd = optarg; break; |
460 | case 'o': of = optarg; break; |
461 | default: f |= f_bogus; break; |
462 | } |
463 | } |
464 | if (argc - optind > 1 || (f & f_bogus)) |
465 | die(EXIT_FAILURE, "Usage: encode [-options] [file]"); |
466 | |
467 | if ((eo = getenc(ef)) == 0) |
468 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
469 | |
470 | if (optind == argc) |
471 | fp = stdin; |
472 | else if (strcmp(argv[optind], "-") == 0) { |
473 | fp = stdin; |
474 | optind++; |
475 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { |
476 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
477 | argv[optind], strerror(errno)); |
478 | } else |
479 | optind++; |
480 | |
481 | if (!of || strcmp(of, "-") == 0) |
482 | ofp = stdout; |
483 | else if ((ofp = fopen(of, eo->wmode)) == 0) { |
484 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
485 | ofp, strerror(errno)); |
486 | } |
487 | |
488 | e = initenc(eo, ofp, bd, 1); |
489 | |
490 | do { |
491 | n = fread(buf, 1, sizeof(buf), fp); |
492 | if (e->ops->write(e, buf, n)) |
493 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
494 | } while (n == sizeof(buf)); |
495 | e->ops->encdone(e); |
496 | freeenc(e); |
497 | return (0); |
498 | |
499 | #undef f_bogus |
500 | } |
501 | |
502 | static int decode(int argc, char *argv[]) |
503 | { |
504 | const char *of = 0; |
505 | FILE *ofp = 0; |
506 | FILE *fp = 0; |
507 | const char *ef = "binary"; |
508 | const char *bd = 0; |
509 | int i; |
510 | char buf[4096]; |
511 | unsigned f = 0; |
512 | const encops *eo; |
513 | enc *e; |
514 | |
515 | #define f_bogus 1u |
516 | |
517 | for (;;) { |
518 | static const struct option opt[] = { |
519 | { "format", OPTF_ARGREQ, 0, 'f' }, |
520 | { "boundary", OPTF_ARGREQ, 0, 'b' }, |
521 | { "output", OPTF_ARGREQ, 0, 'o' }, |
522 | { 0, 0, 0, 0 } |
523 | }; |
524 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); |
525 | if (i < 0) break; |
526 | switch (i) { |
527 | case 'f': ef = optarg; break; |
528 | case 'b': bd = optarg; break; |
529 | case 'o': of = optarg; break; |
530 | default: f |= f_bogus; break; |
531 | } |
532 | } |
533 | if (argc - optind > 1 || (f & f_bogus)) |
534 | die(EXIT_FAILURE, "Usage: decode [-options] [file]"); |
535 | |
536 | if ((eo = getenc(ef)) == 0) |
537 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
538 | |
539 | if (optind == argc) |
540 | fp = stdin; |
541 | else if (strcmp(argv[optind], "-") == 0) { |
542 | fp = stdin; |
543 | optind++; |
544 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { |
545 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
546 | argv[optind], strerror(errno)); |
547 | } else |
548 | optind++; |
549 | |
550 | if (!of || strcmp(of, "-") == 0) |
551 | ofp = stdout; |
552 | else if ((ofp = fopen(of, "wb")) == 0) { |
553 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
554 | ofp, strerror(errno)); |
555 | } |
556 | |
557 | e = initenc(eo, fp, bd, 0); |
558 | |
559 | do { |
560 | if ((i = e->ops->read(e, buf, sizeof(buf))) < 0) |
561 | die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
562 | if (fwrite(buf, 1, i, ofp) < i) |
563 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
564 | } while (i == sizeof(buf)); |
565 | e->ops->decdone(e); |
566 | freeenc(e); |
567 | return (0); |
568 | |
569 | #undef f_bogus |
570 | } |
571 | |
572 | /*----- Main code ---------------------------------------------------------*/ |
573 | |
574 | typedef struct cmd { |
575 | const char *name; |
576 | int (*func)(int /*argc*/, char */*argv*/[]); |
577 | const char *usage; |
578 | const char *help; |
579 | } cmd; |
580 | |
581 | static cmd cmdtab[] = { |
582 | { "encode", encode, |
583 | "encode [-f format] [-b label] [-o output] [file]", |
584 | "\ |
585 | Options:\n\ |
586 | \n\ |
587 | -f, --format=FORMAT Encode to FORMAT.\n\ |
588 | -b, --boundary=LABEL PEM boundary is LABEL.\n\ |
589 | -o, --output=FILE Write output to FILE.\n\ |
590 | " }, |
591 | { "decode", decode, |
592 | "decode [-f format] [-b label] [-o output] [file]", |
593 | "\ |
594 | Options:\n\ |
595 | \n\ |
596 | -f, --format=FORMAT Decode from FORMAT.\n\ |
597 | -b, --boundary=LABEL PEM boundary is LABEL.\n\ |
598 | -o, --output=FILE Write output to FILE.\n\ |
599 | " }, |
600 | { "encrypt", encrypt, |
601 | "encrypt [-a] [-k tag] [f format]] [-o output] [file]", |
602 | "\ |
603 | Options:\n\ |
604 | \n\ |
605 | -a, --armour Same as `-f pem'.\n\ |
606 | -f, --format=FORMAT Encode as FORMAT.\n\ |
607 | -k, --key=TAG Use public key named by TAG.\n\ |
608 | -o, --output=FILE Write output to FILE.\n\ |
609 | " }, |
610 | { "decrypt", decrypt, |
611 | "decrypt [-t] [-o output] [file]", "\ |
612 | Options:\n\ |
613 | \n\ |
614 | -t, --text Read PEM-encoded input.\n\ |
615 | -o, --output=FILE Write output to FILE.\n\ |
616 | " }, |
617 | { 0, 0, 0 } |
618 | }; |
619 | |
620 | /* --- @findcmd@ --- * |
621 | * |
622 | * Arguments: @const char *name@ = a command name |
623 | * |
624 | * Returns: Pointer to the command structure. |
625 | * |
626 | * Use: Looks up a command by name. If the command isn't found, an |
627 | * error is reported and the program is terminated. |
628 | */ |
629 | |
630 | static cmd *findcmd(const char *name) |
631 | { |
632 | cmd *c, *chosen = 0; |
633 | size_t sz = strlen(name); |
634 | |
635 | for (c = cmdtab; c->name; c++) { |
636 | if (strncmp(name, c->name, sz) == 0) { |
637 | if (c->name[sz] == 0) { |
638 | chosen = c; |
639 | break; |
640 | } else if (chosen) |
641 | die(EXIT_FAILURE, "ambiguous command name `%s'", name); |
642 | else |
643 | chosen = c; |
644 | } |
645 | } |
646 | if (!chosen) |
647 | die(EXIT_FAILURE, "unknown command name `%s'", name); |
648 | return (chosen); |
649 | } |
650 | |
651 | static void version(FILE *fp) |
652 | { |
653 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
654 | } |
655 | |
656 | static void usage(FILE *fp) |
657 | { |
658 | pquis(fp, "Usage: $ [-k keyring] command [args]\n"); |
659 | } |
660 | |
661 | static void help(FILE *fp, char **argv) |
662 | { |
663 | cmd *c; |
664 | |
665 | if (*argv) { |
666 | c = findcmd(*argv); |
667 | fprintf(fp, "Usage: %s [-k keyring] %s\n", QUIS, c->usage); |
668 | if (c->help) { |
669 | fputc('\n', fp); |
670 | fputs(c->help, fp); |
671 | } |
672 | } else { |
673 | version(fp); |
674 | fputc('\n', fp); |
675 | usage(fp); |
676 | fputs("\n\ |
677 | Create and verify signatures on lists of files.\n\ |
678 | \n", fp); |
679 | for (c = cmdtab; c->name; c++) |
680 | fprintf(fp, "%s\n", c->usage); |
681 | } |
682 | } |
683 | |
684 | /* --- @main@ --- * |
685 | * |
686 | * Arguments: @int argc@ = number of command line arguments |
687 | * @char *argv[]@ = vector of command line arguments |
688 | * |
689 | * Returns: Zero if successful, nonzero otherwise. |
690 | * |
691 | * Use: Signs or verifies signatures on lists of files. Useful for |
692 | * ensuring that a distribution is unmolested. |
693 | */ |
694 | |
695 | int main(int argc, char *argv[]) |
696 | { |
697 | unsigned f = 0; |
698 | |
699 | #define f_bogus 1u |
700 | |
701 | /* --- Initialize the library --- */ |
702 | |
703 | ego(argv[0]); |
704 | sub_init(); |
705 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
706 | rand_seed(RAND_GLOBAL, 160); |
707 | |
708 | /* --- Parse options --- */ |
709 | |
710 | for (;;) { |
711 | static struct option opts[] = { |
712 | { "help", 0, 0, 'h' }, |
713 | { "version", 0, 0, 'v' }, |
714 | { "usage", 0, 0, 'u' }, |
715 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
716 | { 0, 0, 0, 0 } |
717 | }; |
718 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
719 | if (i < 0) |
720 | break; |
721 | switch (i) { |
722 | case 'h': |
723 | help(stdout, argv + optind); |
724 | exit(0); |
725 | break; |
726 | case 'v': |
727 | version(stdout); |
728 | exit(0); |
729 | break; |
730 | case 'u': |
731 | usage(stdout); |
732 | exit(0); |
733 | case 'k': |
734 | keyring = optarg; |
735 | break; |
736 | default: |
737 | f |= f_bogus; |
738 | break; |
739 | } |
740 | } |
741 | |
742 | argc -= optind; |
743 | argv += optind; |
744 | optind = 0; |
745 | if (f & f_bogus || argc < 1) { |
746 | usage(stderr); |
747 | exit(EXIT_FAILURE); |
748 | } |
749 | |
750 | /* --- Dispatch to the correct subcommand handler --- */ |
751 | |
752 | return (findcmd(argv[0])->func(argc, argv)); |
753 | |
754 | #undef f_bogus |
755 | } |
756 | |
757 | /*----- That's all, folks -------------------------------------------------*/ |