5c3f75ec |
1 | /* -*-c-*- |
2 | * |
c65df279 |
3 | * $Id$ |
5c3f75ec |
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 | |
c65df279 |
53 | #include "ectab.h" |
54 | #include "ptab.h" |
55 | |
5c3f75ec |
56 | /*----- Static variables --------------------------------------------------*/ |
57 | |
58 | static const char *keyring = "keyring"; |
59 | |
60 | /*----- Data format -------------------------------------------------------*/ |
61 | |
62 | /* --- Overview --- * |
63 | * |
64 | * The encrypted message is divided into chunks, each preceded by a two-octet |
65 | * length. The chunks don't need to be large -- the idea is that we can |
66 | * stream the chunks in and out. |
67 | * |
68 | * The first chunk is a header. It contains the decryption key-id, and maybe |
69 | * the verification key-id if the message is signed. |
70 | * |
71 | * Next comes the key-encapsulation chunk. This is decrypted in some |
38b90111 |
72 | * KEM-specific way to yield a secret hash. The hash is expanded using an |
73 | * MGF (or similar) to make a symmetric encryption and MAC key. |
5c3f75ec |
74 | * |
75 | * If the message is signed, there comes a signature chunk. The signature is |
f9e51332 |
76 | * on the header and key-encapsulation chunks, and further output of the MGF. |
77 | * This means that the recipient can modify the message and still have a |
78 | * valid signature, so it's not useful for proving things to other people; |
79 | * but it also means that the recipient knows that the message is from |
80 | * someone who knows the hash, which limits the possiblities to (a) whoever |
81 | * encrypted the message (good!) and (b) whoever knows the recipient's |
82 | * private key. |
5c3f75ec |
83 | * |
84 | * Then come message chunks. Each one begins with a MAC over an implicit |
85 | * sequence number and the ciphertext. The final chunk's ciphertext is |
86 | * empty; no other chunk is empty. Thus can the correct end-of-file be |
87 | * discerned. |
88 | */ |
89 | |
90 | /*----- Chunk I/O ---------------------------------------------------------*/ |
91 | |
92 | static void chunk_write(enc *e, buf *b) |
93 | { |
94 | octet l[2]; |
95 | size_t n = BLEN(b); |
96 | assert(n <= MASK16); |
97 | STORE16(l, n); |
98 | if (e->ops->write(e, l, 2) || |
99 | e->ops->write(e, BBASE(b), BLEN(b))) |
100 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
101 | } |
102 | |
103 | static void chunk_read(enc *e, dstr *d, buf *b) |
104 | { |
105 | octet l[2]; |
106 | size_t n; |
107 | |
108 | dstr_reset(d); |
109 | errno = 0; |
110 | if (e->ops->read(e, l, 2) != 2) |
111 | goto err; |
112 | n = LOAD16(l); |
113 | dstr_ensure(d, n); |
114 | if (e->ops->read(e, d->buf, n) != n) |
115 | goto err; |
116 | d->len = n; |
117 | buf_init(b, d->buf, d->len); |
118 | return; |
119 | |
120 | err: |
121 | if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); |
122 | else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
123 | } |
124 | |
125 | /*----- Encryption --------------------------------------------------------*/ |
126 | |
127 | static int encrypt(int argc, char *argv[]) |
128 | { |
c65df279 |
129 | const char *of = 0, *kn = "ccrypt", *skn = 0; |
5c3f75ec |
130 | FILE *ofp = 0; |
131 | FILE *fp = 0; |
132 | const char *ef = "binary"; |
133 | const char *err; |
134 | int i; |
c65df279 |
135 | int en; |
5c3f75ec |
136 | size_t n; |
137 | dstr d = DSTR_INIT; |
138 | octet *tag, *ct; |
139 | buf b; |
140 | size_t seq; |
141 | char bb[16384]; |
142 | unsigned f = 0; |
143 | key_file kf; |
144 | key *k; |
c65df279 |
145 | key *sk = 0; |
5c3f75ec |
146 | kem *km; |
c65df279 |
147 | sig *s = 0; |
5c3f75ec |
148 | gcipher *cx, *c; |
149 | gmac *m; |
150 | ghash *h; |
151 | const encops *eo; |
152 | enc *e; |
153 | |
154 | #define f_bogus 1u |
946c3f72 |
155 | #define f_nocheck 2u |
5c3f75ec |
156 | |
157 | for (;;) { |
158 | static const struct option opt[] = { |
159 | { "key", OPTF_ARGREQ, 0, 'k' }, |
c65df279 |
160 | { "sign-key", OPTF_ARGREQ, 0, 's' }, |
5c3f75ec |
161 | { "armour", 0, 0, 'a' }, |
162 | { "armor", 0, 0, 'a' }, |
163 | { "format", OPTF_ARGREQ, 0, 'f' }, |
164 | { "output", OPTF_ARGREQ, 0, 'o' }, |
946c3f72 |
165 | { "nocheck", 0, 0, 'C' }, |
5c3f75ec |
166 | { 0, 0, 0, 0 } |
167 | }; |
946c3f72 |
168 | i = mdwopt(argc, argv, "k:s:af:o:C", opt, 0, 0, 0); |
5c3f75ec |
169 | if (i < 0) break; |
170 | switch (i) { |
171 | case 'k': kn = optarg; break; |
c65df279 |
172 | case 's': skn = optarg; break; |
5c3f75ec |
173 | case 'a': ef = "pem"; break; |
174 | case 'f': ef = optarg; break; |
175 | case 'o': of = optarg; break; |
946c3f72 |
176 | case 'C': f |= f_nocheck; break; |
5c3f75ec |
177 | default: f |= f_bogus; break; |
178 | } |
179 | } |
180 | if (argc - optind > 1 || (f & f_bogus)) |
c65df279 |
181 | die(EXIT_FAILURE, "Usage: encrypt [-OPTIONS] [FILE]"); |
5c3f75ec |
182 | |
213e565f |
183 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec |
184 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
185 | if ((k = key_bytag(&kf, kn)) == 0) |
186 | die(EXIT_FAILURE, "key `%s' not found", kn); |
c65df279 |
187 | if (skn && (sk = key_bytag(&kf, skn)) == 0) |
188 | die(EXIT_FAILURE, "key `%s' not found", skn); |
5c3f75ec |
189 | |
190 | if ((eo = getenc(ef)) == 0) |
191 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
192 | |
193 | if (optind == argc) |
194 | fp = stdin; |
195 | else if (strcmp(argv[optind], "-") == 0) { |
196 | fp = stdin; |
197 | optind++; |
198 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { |
199 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
200 | argv[optind], strerror(errno)); |
201 | } else |
202 | optind++; |
203 | |
204 | if (!of || strcmp(of, "-") == 0) |
205 | ofp = stdout; |
206 | else if ((ofp = fopen(of, eo->wmode)) == 0) { |
207 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
208 | ofp, strerror(errno)); |
209 | } |
210 | |
c65df279 |
211 | dstr_reset(&d); |
5c3f75ec |
212 | key_fulltag(k, &d); |
fa54fe1e |
213 | e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE"); |
c65df279 |
214 | km = getkem(k, "cckem", 0); |
946c3f72 |
215 | if (!(f & f_nocheck) && (err = km->ops->check(km)) != 0) |
fa54fe1e |
216 | moan("key %s fails check: %s", d.buf, err); |
c65df279 |
217 | if (sk) { |
218 | dstr_reset(&d); |
219 | key_fulltag(sk, &d); |
220 | s = getsig(sk, "ccsig", 1); |
221 | if ((err = s->ops->check(s)) != 0) |
fa54fe1e |
222 | moan("key %s fails check: %s", d.buf, err); |
c65df279 |
223 | } |
5c3f75ec |
224 | |
225 | /* --- Build the header chunk --- */ |
226 | |
227 | dstr_reset(&d); |
228 | dstr_ensure(&d, 256); |
229 | buf_init(&b, d.buf, 256); |
230 | buf_putu32(&b, k->id); |
c65df279 |
231 | if (sk) buf_putu32(&b, sk->id); |
5c3f75ec |
232 | assert(BOK(&b)); |
f9e51332 |
233 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec |
234 | chunk_write(e, &b); |
235 | |
236 | /* --- Build the KEM chunk --- */ |
237 | |
238 | dstr_reset(&d); |
239 | if (setupkem(km, &d, &cx, &c, &m)) |
240 | die(EXIT_FAILURE, "failed to encapsulate key"); |
241 | buf_init(&b, d.buf, d.len); |
242 | BSTEP(&b, d.len); |
f9e51332 |
243 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec |
244 | chunk_write(e, &b); |
245 | |
c65df279 |
246 | /* --- Write the signature chunk --- */ |
247 | |
248 | if (s) { |
249 | GC_ENCRYPT(cx, 0, bb, 1024); |
250 | GH_HASH(s->h, bb, 1024); |
251 | dstr_reset(&d); |
252 | if ((en = s->ops->doit(s, &d)) != 0) |
253 | die(EXIT_FAILURE, "error creating signature: %s", key_strerror(en)); |
254 | buf_init(&b, d.buf, d.len); |
255 | BSTEP(&b, d.len); |
256 | chunk_write(e, &b); |
257 | } |
258 | |
5c3f75ec |
259 | /* --- Now do the main crypto --- */ |
260 | |
261 | assert(GC_CLASS(c)->blksz <= sizeof(bb)); |
262 | dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); |
263 | seq = 0; |
264 | for (;;) { |
265 | h = GM_INIT(m); |
dfd1608a |
266 | GH_HASHU32(h, seq); |
5c3f75ec |
267 | seq++; |
268 | if (GC_CLASS(c)->blksz) { |
269 | GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); |
270 | GC_SETIV(c, bb); |
271 | } |
272 | n = fread(bb, 1, sizeof(bb), fp); |
273 | if (!n) break; |
274 | buf_init(&b, d.buf, d.sz); |
275 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
276 | ct = buf_get(&b, n); |
277 | assert(tag); assert(ct); |
278 | GC_ENCRYPT(c, bb, ct, n); |
279 | GH_HASH(h, ct, n); |
280 | GH_DONE(h, tag); |
281 | GH_DESTROY(h); |
282 | chunk_write(e, &b); |
283 | } |
284 | |
285 | /* --- Final terminator packet --- */ |
286 | |
287 | buf_init(&b, d.buf, d.sz); |
288 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
289 | assert(tag); |
290 | GH_DONE(h, tag); |
291 | GH_DESTROY(h); |
292 | chunk_write(e, &b); |
293 | |
294 | /* --- All done --- */ |
295 | |
296 | e->ops->encdone(e); |
297 | GM_DESTROY(m); |
298 | GC_DESTROY(c); |
299 | GC_DESTROY(cx); |
300 | freeenc(e); |
c65df279 |
301 | if (s) freesig(s); |
5c3f75ec |
302 | freekem(km); |
ef13e9a4 |
303 | if (fp != stdin) fclose(fp); |
5c3f75ec |
304 | if (of) fclose(ofp); |
305 | key_close(&kf); |
306 | dstr_destroy(&d); |
307 | return (0); |
308 | |
309 | #undef f_bogus |
946c3f72 |
310 | #undef f_nocheck |
5c3f75ec |
311 | } |
312 | |
313 | /*---- Decryption ---------------------------------------------------------*/ |
314 | |
315 | static int decrypt(int argc, char *argv[]) |
316 | { |
317 | const char *of = 0; |
fa54fe1e |
318 | FILE *ofp = 0, *rfp = 0; |
5c3f75ec |
319 | FILE *fp = 0; |
320 | const char *ef = "binary"; |
321 | int i; |
fa54fe1e |
322 | size_t n; |
5c3f75ec |
323 | dstr d = DSTR_INIT; |
324 | buf b; |
325 | key_file kf; |
326 | size_t seq; |
327 | uint32 id; |
328 | key *k; |
c65df279 |
329 | key *sk = 0; |
5c3f75ec |
330 | kem *km; |
c65df279 |
331 | sig *s = 0; |
5c3f75ec |
332 | gcipher *cx; |
333 | gcipher *c; |
334 | ghash *h; |
335 | gmac *m; |
336 | octet *tag; |
337 | unsigned f = 0; |
338 | const encops *eo; |
c65df279 |
339 | const char *err; |
340 | int verb = 1; |
5c3f75ec |
341 | enc *e; |
342 | |
343 | #define f_bogus 1u |
fa54fe1e |
344 | #define f_buffer 2u |
946c3f72 |
345 | #define f_nocheck 4u |
5c3f75ec |
346 | |
347 | for (;;) { |
348 | static const struct option opt[] = { |
349 | { "armour", 0, 0, 'a' }, |
350 | { "armor", 0, 0, 'a' }, |
fa54fe1e |
351 | { "buffer", 0, 0, 'b' }, |
c65df279 |
352 | { "verbose", 0, 0, 'v' }, |
353 | { "quiet", 0, 0, 'q' }, |
946c3f72 |
354 | { "nocheck", 0, 0, 'C' }, |
5c3f75ec |
355 | { "format", OPTF_ARGREQ, 0, 'f' }, |
356 | { "output", OPTF_ARGREQ, 0, 'o' }, |
357 | { 0, 0, 0, 0 } |
358 | }; |
946c3f72 |
359 | i = mdwopt(argc, argv, "abf:o:qvC", opt, 0, 0, 0); |
5c3f75ec |
360 | if (i < 0) break; |
361 | switch (i) { |
362 | case 'a': ef = "pem"; break; |
fa54fe1e |
363 | case 'b': f |= f_buffer; break; |
c65df279 |
364 | case 'v': verb++; break; |
365 | case 'q': if (verb) verb--; break; |
946c3f72 |
366 | case 'C': f |= f_nocheck; break; |
5c3f75ec |
367 | case 'f': ef = optarg; break; |
368 | case 'o': of = optarg; break; |
369 | default: f |= f_bogus; break; |
370 | } |
371 | } |
372 | if (argc - optind > 1 || (f & f_bogus)) |
c65df279 |
373 | die(EXIT_FAILURE, "Usage: decrypt [-OPTIONS] [FILE]"); |
5c3f75ec |
374 | |
375 | if ((eo = getenc(ef)) == 0) |
376 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
377 | |
378 | if (optind == argc) |
379 | fp = stdin; |
380 | else if (strcmp(argv[optind], "-") == 0) { |
381 | fp = stdin; |
382 | optind++; |
383 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { |
384 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
385 | argv[optind], strerror(errno)); |
386 | } else |
387 | optind++; |
388 | |
213e565f |
389 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec |
390 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
391 | |
fa54fe1e |
392 | e = initdec(eo, fp, checkbdry, "CATCRYPT ENCRYPTED MESSAGE"); |
5c3f75ec |
393 | |
394 | /* --- Read the header chunk --- */ |
395 | |
396 | chunk_read(e, &d, &b); |
c65df279 |
397 | if (buf_getu32(&b, &id)) { |
398 | if (verb) printf("FAIL malformed header: missing keyid\n"); |
399 | exit(EXIT_FAILURE); |
400 | } |
401 | if ((k = key_byid(&kf, id)) == 0) { |
402 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
403 | exit(EXIT_FAILURE); |
404 | } |
405 | if (BLEFT(&b)) { |
406 | if (buf_getu32(&b, &id)) { |
407 | if (verb) printf("FAIL malformed header: missing signature keyid\n"); |
408 | exit(EXIT_FAILURE); |
409 | } |
410 | if ((sk = key_byid(&kf, id)) == 0) { |
411 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
412 | exit(EXIT_FAILURE); |
413 | } |
414 | } |
415 | if (BLEFT(&b)) { |
416 | if (verb) printf("FAIL malformed header: junk at end\n"); |
417 | exit(EXIT_FAILURE); |
418 | } |
f9e51332 |
419 | if (sk) { |
420 | s = getsig(sk, "ccsig", 0); |
421 | if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0) { |
422 | dstr_reset(&d); |
423 | key_fulltag(sk, &d); |
424 | printf("WARN verification key %s fails check: %s\n", d.buf, err); |
425 | } |
426 | GH_HASHBUF16(s->h, BBASE(&b), BSZ(&b)); |
427 | } |
5c3f75ec |
428 | |
429 | /* --- Find the key --- */ |
430 | |
c65df279 |
431 | km = getkem(k, "cckem", 1); |
5c3f75ec |
432 | |
433 | /* --- Read the KEM chunk --- */ |
434 | |
435 | chunk_read(e, &d, &b); |
c65df279 |
436 | if (setupkem(km, &d, &cx, &c, &m)) { |
437 | if (verb) printf("FAIL failed to decapsulate key\n"); |
438 | exit(EXIT_FAILURE); |
439 | } |
f9e51332 |
440 | if (s) GH_HASHBUF16(s->h, d.buf, d.len); |
c65df279 |
441 | |
442 | /* --- Verify the signature, if there is one --- */ |
443 | |
444 | if (sk) { |
c65df279 |
445 | dstr_reset(&d); |
446 | dstr_ensure(&d, 1024); |
447 | GC_ENCRYPT(cx, 0, d.buf, 1024); |
448 | GH_HASH(s->h, d.buf, 1024); |
449 | chunk_read(e, &d, &b); |
450 | if (s->ops->doit(s, &d)) { |
451 | if (verb) printf("FAIL signature verification failed\n"); |
452 | exit(EXIT_FAILURE); |
453 | } |
454 | if (verb) { |
455 | dstr_reset(&d); |
456 | key_fulltag(sk, &d); |
fa54fe1e |
457 | printf("INFO good-signature %s\n", d.buf); |
c65df279 |
458 | } |
ef13e9a4 |
459 | freesig(s); |
c65df279 |
460 | } else if (verb) |
fa54fe1e |
461 | printf("INFO no-signature\n"); |
5c3f75ec |
462 | |
463 | /* --- Now decrypt the main body --- */ |
464 | |
c65df279 |
465 | if (!of || strcmp(of, "-") == 0) { |
5c3f75ec |
466 | ofp = stdout; |
fa54fe1e |
467 | f |= f_buffer; |
5c3f75ec |
468 | } |
fa54fe1e |
469 | if (!(f & f_buffer)) { |
470 | if ((ofp = fopen(of, "wb")) == 0) { |
471 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
472 | ofp, strerror(errno)); |
473 | } |
474 | rfp = ofp; |
475 | } else if ((rfp = tmpfile()) == 0) |
476 | die(EXIT_FAILURE, "couldn't create temporary file: %s", strerror(errno)); |
5c3f75ec |
477 | |
478 | seq = 0; |
479 | dstr_ensure(&d, GC_CLASS(c)->blksz); |
480 | dstr_ensure(&d, 4); |
481 | for (;;) { |
482 | if (GC_CLASS(c)->blksz) { |
483 | GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); |
484 | GC_SETIV(c, d.buf); |
485 | } |
486 | h = GM_INIT(m); |
dfd1608a |
487 | GH_HASHU32(h, seq); |
5c3f75ec |
488 | seq++; |
489 | chunk_read(e, &d, &b); |
c65df279 |
490 | if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) { |
fa54fe1e |
491 | if (verb) printf("FAIL bad ciphertext chunk: no tag\n"); |
c65df279 |
492 | exit(EXIT_FAILURE); |
493 | } |
5c3f75ec |
494 | GH_HASH(h, BCUR(&b), BLEFT(&b)); |
c65df279 |
495 | if (memcmp(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz) != 0) { |
496 | if (verb) |
fa54fe1e |
497 | printf("FAIL bad ciphertext chunk: authentication failure\n"); |
c65df279 |
498 | exit(EXIT_FAILURE); |
499 | } |
ef13e9a4 |
500 | GH_DESTROY(h); |
5c3f75ec |
501 | if (!BLEFT(&b)) |
502 | break; |
503 | GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); |
fa54fe1e |
504 | if (fwrite(BCUR(&b), 1, BLEFT(&b), rfp) != BLEFT(&b)) { |
505 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); |
c65df279 |
506 | exit(EXIT_FAILURE); |
507 | } |
508 | } |
509 | |
fa54fe1e |
510 | if (fflush(rfp) || ferror(rfp)) { |
511 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); |
c65df279 |
512 | exit(EXIT_FAILURE); |
5c3f75ec |
513 | } |
fa54fe1e |
514 | if (f & f_buffer) { |
515 | if (!ofp && (ofp = fopen(of, "wb")) == 0) { |
516 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
517 | of, strerror(errno)); |
518 | } |
519 | rewind(rfp); |
520 | dstr_reset(&d); |
521 | dstr_ensure(&d, 65536); |
64459c98 |
522 | if (verb && ofp == stdout) printf("DATA\n"); |
fa54fe1e |
523 | for (;;) { |
524 | n = fread(d.buf, 1, d.sz, rfp); |
525 | if (!n) break; |
526 | if (fwrite(d.buf, 1, n, ofp) < n) |
527 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
528 | } |
529 | if (ferror(rfp) || fclose(rfp)) |
530 | die(EXIT_FAILURE, "error unbuffering output: %s", strerror(errno)); |
531 | } |
532 | if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp))) |
533 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
5c3f75ec |
534 | |
5c3f75ec |
535 | e->ops->decdone(e); |
c65df279 |
536 | if (verb && ofp != stdout) |
537 | printf("OK decrypted successfully\n"); |
5c3f75ec |
538 | freeenc(e); |
539 | GC_DESTROY(c); |
540 | GC_DESTROY(cx); |
541 | GM_DESTROY(m); |
542 | freekem(km); |
ef13e9a4 |
543 | if (fp != stdin) fclose(fp); |
5c3f75ec |
544 | if (of) fclose(ofp); |
545 | key_close(&kf); |
546 | dstr_destroy(&d); |
547 | return (0); |
548 | |
549 | #undef f_bogus |
fa54fe1e |
550 | #undef f_buffer |
946c3f72 |
551 | #undef f_nocheck |
5c3f75ec |
552 | } |
553 | |
554 | /*----- Main code ---------------------------------------------------------*/ |
555 | |
c65df279 |
556 | #define LISTS(LI) \ |
557 | LI("Lists", list, \ |
558 | listtab[i].name, listtab[i].name) \ |
559 | LI("Key-encapsulation mechanisms", kem, \ |
560 | kemtab[i].name, kemtab[i].name) \ |
561 | LI("Signature schemes", sig, \ |
562 | sigtab[i].name, sigtab[i].name) \ |
563 | LI("Encodings", enc, \ |
564 | enctab[i].name, enctab[i].name) \ |
565 | LI("Symmetric encryption algorithms", cipher, \ |
566 | gciphertab[i], gciphertab[i]->name) \ |
567 | LI("Hash functions", hash, \ |
568 | ghashtab[i], ghashtab[i]->name) \ |
569 | LI("Message authentication codes", mac, \ |
570 | gmactab[i], gmactab[i]->name) |
571 | |
572 | MAKELISTTAB(listtab, LISTS) |
573 | |
574 | int cmd_show(int argc, char *argv[]) |
575 | { |
576 | return (displaylists(listtab, argv + 1)); |
577 | } |
578 | |
579 | static int cmd_help(int, char **); |
5c3f75ec |
580 | |
581 | static cmd cmdtab[] = { |
c65df279 |
582 | { "help", cmd_help, "help [COMMAND...]" }, |
583 | { "show", cmd_show, "show [ITEM...]" }, |
fa54fe1e |
584 | CMD_ENCODE, |
585 | CMD_DECODE, |
5c3f75ec |
586 | { "encrypt", encrypt, |
946c3f72 |
587 | "encrypt [-aC] [-k TAG] [-s TAG] [-f FORMAT]\n\t\ |
c65df279 |
588 | [-o OUTPUT] [FILE]", "\ |
5c3f75ec |
589 | Options:\n\ |
590 | \n\ |
591 | -a, --armour Same as `-f pem'.\n\ |
592 | -f, --format=FORMAT Encode as FORMAT.\n\ |
c65df279 |
593 | -k, --key=TAG Use public encryption key named by TAG.\n\ |
594 | -s, --sign-key=TAG Use private signature key named by TAG.\n\ |
5c3f75ec |
595 | -o, --output=FILE Write output to FILE.\n\ |
946c3f72 |
596 | -C, --nocheck Don't check the public key.\n\ |
5c3f75ec |
597 | " }, |
598 | { "decrypt", decrypt, |
946c3f72 |
599 | "decrypt [-abqvC] [-f FORMAT] [-o OUTPUT] [FILE]", "\ |
5c3f75ec |
600 | Options:\n\ |
601 | \n\ |
c65df279 |
602 | -a, --armour Same as `-f pem'.\n\ |
fa54fe1e |
603 | -b, --buffer Buffer output until we're sure we have it all.\n\ |
c65df279 |
604 | -f, --format=FORMAT Decode as FORMAT.\n\ |
5c3f75ec |
605 | -o, --output=FILE Write output to FILE.\n\ |
fa54fe1e |
606 | -q, --quiet Produce fewer messages.\n\ |
607 | -v, --verbose Produce more verbose messages.\n\ |
946c3f72 |
608 | -C, --nocheck Don't check the private key.\n\ |
fa54fe1e |
609 | " }, /* ' emacs is confused */ |
5c3f75ec |
610 | { 0, 0, 0 } |
611 | }; |
612 | |
c65df279 |
613 | static int cmd_help(int argc, char **argv) |
5c3f75ec |
614 | { |
c65df279 |
615 | sc_help(cmdtab, stdout, argv + 1); |
616 | return (0); |
5c3f75ec |
617 | } |
618 | |
c65df279 |
619 | void version(FILE *fp) |
5c3f75ec |
620 | { |
621 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
622 | } |
623 | |
624 | static void usage(FILE *fp) |
625 | { |
c65df279 |
626 | pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n"); |
5c3f75ec |
627 | } |
628 | |
c65df279 |
629 | void help_global(FILE *fp) |
5c3f75ec |
630 | { |
c65df279 |
631 | usage(fp); |
632 | fputs("\n\ |
ada55141 |
633 | Encrypt and decrypt files.\n\ |
c65df279 |
634 | \n\ |
635 | Global command-line options:\n\ |
636 | \n\ |
637 | -h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\ |
638 | -v, --version Show program version number.\n\ |
639 | -u, --usage Show a terse usage message.\n\ |
640 | \n\ |
641 | -k, --keyring=FILE Read keys from FILE.\n", |
642 | fp); |
5c3f75ec |
643 | } |
644 | |
645 | /* --- @main@ --- * |
646 | * |
647 | * Arguments: @int argc@ = number of command line arguments |
648 | * @char *argv[]@ = vector of command line arguments |
649 | * |
650 | * Returns: Zero if successful, nonzero otherwise. |
651 | * |
c65df279 |
652 | * Use: Encrypts or decrypts files. |
5c3f75ec |
653 | */ |
654 | |
655 | int main(int argc, char *argv[]) |
656 | { |
657 | unsigned f = 0; |
658 | |
659 | #define f_bogus 1u |
660 | |
661 | /* --- Initialize the library --- */ |
662 | |
663 | ego(argv[0]); |
664 | sub_init(); |
665 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
666 | rand_seed(RAND_GLOBAL, 160); |
667 | |
668 | /* --- Parse options --- */ |
669 | |
670 | for (;;) { |
671 | static struct option opts[] = { |
672 | { "help", 0, 0, 'h' }, |
673 | { "version", 0, 0, 'v' }, |
674 | { "usage", 0, 0, 'u' }, |
675 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
676 | { 0, 0, 0, 0 } |
677 | }; |
678 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
679 | if (i < 0) |
680 | break; |
681 | switch (i) { |
682 | case 'h': |
c65df279 |
683 | sc_help(cmdtab, stdout, argv + optind); |
5c3f75ec |
684 | exit(0); |
685 | break; |
686 | case 'v': |
687 | version(stdout); |
688 | exit(0); |
689 | break; |
690 | case 'u': |
691 | usage(stdout); |
692 | exit(0); |
693 | case 'k': |
694 | keyring = optarg; |
695 | break; |
696 | default: |
697 | f |= f_bogus; |
698 | break; |
699 | } |
700 | } |
701 | |
702 | argc -= optind; |
703 | argv += optind; |
704 | optind = 0; |
705 | if (f & f_bogus || argc < 1) { |
706 | usage(stderr); |
707 | exit(EXIT_FAILURE); |
708 | } |
709 | |
710 | /* --- Dispatch to the correct subcommand handler --- */ |
711 | |
c65df279 |
712 | return (findcmd(cmdtab, argv[0])->cmd(argc, argv)); |
5c3f75ec |
713 | |
714 | #undef f_bogus |
715 | } |
716 | |
717 | /*----- That's all, folks -------------------------------------------------*/ |