Commit | Line | Data |
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5c3f75ec | 1 | /* -*-c-*- |
2 | * | |
5c3f75ec | 3 | * Command-line encryption tool |
4 | * | |
5 | * (c) 2004 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
5c3f75ec | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
5c3f75ec | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
5c3f75ec | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
28 | /*----- Header files ------------------------------------------------------*/ | |
29 | ||
cd6eca43 MW |
30 | #define _FILE_OFFSET_BITS 64 |
31 | ||
5c3f75ec | 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" | |
da4489a6 | 47 | #include "ct.h" |
5c3f75ec | 48 | #include "rand.h" |
49 | #include "noise.h" | |
50 | #include "mprand.h" | |
51 | #include "key.h" | |
52 | #include "cc.h" | |
53 | ||
c65df279 | 54 | #include "ectab.h" |
55 | #include "ptab.h" | |
56 | ||
5c3f75ec | 57 | /*----- Static variables --------------------------------------------------*/ |
58 | ||
59 | static const char *keyring = "keyring"; | |
60 | ||
61 | /*----- Data format -------------------------------------------------------*/ | |
62 | ||
63 | /* --- Overview --- * | |
64 | * | |
65 | * The encrypted message is divided into chunks, each preceded by a two-octet | |
66 | * length. The chunks don't need to be large -- the idea is that we can | |
67 | * stream the chunks in and out. | |
68 | * | |
69 | * The first chunk is a header. It contains the decryption key-id, and maybe | |
70 | * the verification key-id if the message is signed. | |
71 | * | |
72 | * Next comes the key-encapsulation chunk. This is decrypted in some | |
38b90111 | 73 | * KEM-specific way to yield a secret hash. The hash is expanded using an |
74 | * MGF (or similar) to make a symmetric encryption and MAC key. | |
5c3f75ec | 75 | * |
76 | * If the message is signed, there comes a signature chunk. The signature is | |
f9e51332 | 77 | * on the header and key-encapsulation chunks, and further output of the MGF. |
78 | * This means that the recipient can modify the message and still have a | |
79 | * valid signature, so it's not useful for proving things to other people; | |
80 | * but it also means that the recipient knows that the message is from | |
81 | * someone who knows the hash, which limits the possiblities to (a) whoever | |
82 | * encrypted the message (good!) and (b) whoever knows the recipient's | |
83 | * private key. | |
5c3f75ec | 84 | * |
85 | * Then come message chunks. Each one begins with a MAC over an implicit | |
86 | * sequence number and the ciphertext. The final chunk's ciphertext is | |
87 | * empty; no other chunk is empty. Thus can the correct end-of-file be | |
88 | * discerned. | |
89 | */ | |
90 | ||
91 | /*----- Chunk I/O ---------------------------------------------------------*/ | |
92 | ||
93 | static void chunk_write(enc *e, buf *b) | |
94 | { | |
95 | octet l[2]; | |
96 | size_t n = BLEN(b); | |
97 | assert(n <= MASK16); | |
98 | STORE16(l, n); | |
99 | if (e->ops->write(e, l, 2) || | |
100 | e->ops->write(e, BBASE(b), BLEN(b))) | |
101 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
102 | } | |
103 | ||
104 | static void chunk_read(enc *e, dstr *d, buf *b) | |
105 | { | |
106 | octet l[2]; | |
107 | size_t n; | |
108 | ||
109 | dstr_reset(d); | |
110 | errno = 0; | |
111 | if (e->ops->read(e, l, 2) != 2) | |
112 | goto err; | |
113 | n = LOAD16(l); | |
114 | dstr_ensure(d, n); | |
115 | if (e->ops->read(e, d->buf, n) != n) | |
116 | goto err; | |
117 | d->len = n; | |
118 | buf_init(b, d->buf, d->len); | |
119 | return; | |
120 | ||
121 | err: | |
122 | if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); | |
123 | else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); | |
124 | } | |
125 | ||
126 | /*----- Encryption --------------------------------------------------------*/ | |
127 | ||
128 | static int encrypt(int argc, char *argv[]) | |
129 | { | |
cd6eca43 | 130 | const char *fn, *of = 0, *kn = "ccrypt", *skn = 0; |
5c3f75ec | 131 | FILE *ofp = 0; |
132 | FILE *fp = 0; | |
133 | const char *ef = "binary"; | |
cd6eca43 | 134 | fprogress ff; |
5c3f75ec | 135 | const char *err; |
136 | int i; | |
c65df279 | 137 | int en; |
f52f2db0 | 138 | size_t n, chsz; |
5c3f75ec | 139 | dstr d = DSTR_INIT; |
140 | octet *tag, *ct; | |
141 | buf b; | |
142 | size_t seq; | |
188f51de | 143 | char bb[65536]; |
5c3f75ec | 144 | unsigned f = 0; |
145 | key_file kf; | |
146 | key *k; | |
c65df279 | 147 | key *sk = 0; |
5c3f75ec | 148 | kem *km; |
c65df279 | 149 | sig *s = 0; |
5c3f75ec | 150 | gcipher *cx, *c; |
151 | gmac *m; | |
152 | ghash *h; | |
153 | const encops *eo; | |
154 | enc *e; | |
155 | ||
156 | #define f_bogus 1u | |
946c3f72 | 157 | #define f_nocheck 2u |
cd6eca43 | 158 | #define f_progress 4u |
5c3f75ec | 159 | |
160 | for (;;) { | |
161 | static const struct option opt[] = { | |
162 | { "key", OPTF_ARGREQ, 0, 'k' }, | |
c65df279 | 163 | { "sign-key", OPTF_ARGREQ, 0, 's' }, |
5c3f75ec | 164 | { "armour", 0, 0, 'a' }, |
165 | { "armor", 0, 0, 'a' }, | |
45c0fd36 MW |
166 | { "format", OPTF_ARGREQ, 0, 'f' }, |
167 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 168 | { "progress", 0, 0, 'p' }, |
946c3f72 | 169 | { "nocheck", 0, 0, 'C' }, |
5c3f75ec | 170 | { 0, 0, 0, 0 } |
171 | }; | |
cd6eca43 | 172 | i = mdwopt(argc, argv, "k:s:af:o:pC", opt, 0, 0, 0); |
5c3f75ec | 173 | if (i < 0) break; |
174 | switch (i) { | |
175 | case 'k': kn = optarg; break; | |
c65df279 | 176 | case 's': skn = optarg; break; |
5c3f75ec | 177 | case 'a': ef = "pem"; break; |
178 | case 'f': ef = optarg; break; | |
179 | case 'o': of = optarg; break; | |
cd6eca43 | 180 | case 'p': f |= f_progress; break; |
946c3f72 | 181 | case 'C': f |= f_nocheck; break; |
5c3f75ec | 182 | default: f |= f_bogus; break; |
183 | } | |
184 | } | |
185 | if (argc - optind > 1 || (f & f_bogus)) | |
c65df279 | 186 | die(EXIT_FAILURE, "Usage: encrypt [-OPTIONS] [FILE]"); |
5c3f75ec | 187 | |
213e565f | 188 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec | 189 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
190 | if ((k = key_bytag(&kf, kn)) == 0) | |
191 | die(EXIT_FAILURE, "key `%s' not found", kn); | |
c65df279 | 192 | if (skn && (sk = key_bytag(&kf, skn)) == 0) |
193 | die(EXIT_FAILURE, "key `%s' not found", skn); | |
5c3f75ec | 194 | |
195 | if ((eo = getenc(ef)) == 0) | |
196 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
197 | ||
cd6eca43 MW |
198 | fn = optind < argc ? argv[optind++] : "-"; |
199 | if (strcmp(fn, "-") == 0) | |
5c3f75ec | 200 | fp = stdin; |
cd6eca43 | 201 | else if ((fp = fopen(fn, "rb")) == 0) { |
5c3f75ec | 202 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
203 | fn, strerror(errno)); |
204 | } | |
5c3f75ec | 205 | |
206 | if (!of || strcmp(of, "-") == 0) | |
207 | ofp = stdout; | |
208 | else if ((ofp = fopen(of, eo->wmode)) == 0) { | |
209 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
9b1663a5 | 210 | of, strerror(errno)); |
5c3f75ec | 211 | } |
212 | ||
c65df279 | 213 | dstr_reset(&d); |
5c3f75ec | 214 | key_fulltag(k, &d); |
fa54fe1e | 215 | e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE"); |
c65df279 | 216 | km = getkem(k, "cckem", 0); |
946c3f72 | 217 | if (!(f & f_nocheck) && (err = km->ops->check(km)) != 0) |
fa54fe1e | 218 | moan("key %s fails check: %s", d.buf, err); |
c65df279 | 219 | if (sk) { |
220 | dstr_reset(&d); | |
221 | key_fulltag(sk, &d); | |
222 | s = getsig(sk, "ccsig", 1); | |
223 | if ((err = s->ops->check(s)) != 0) | |
fa54fe1e | 224 | moan("key %s fails check: %s", d.buf, err); |
c65df279 | 225 | } |
5c3f75ec | 226 | |
227 | /* --- Build the header chunk --- */ | |
228 | ||
229 | dstr_reset(&d); | |
230 | dstr_ensure(&d, 256); | |
231 | buf_init(&b, d.buf, 256); | |
232 | buf_putu32(&b, k->id); | |
c65df279 | 233 | if (sk) buf_putu32(&b, sk->id); |
5c3f75ec | 234 | assert(BOK(&b)); |
f9e51332 | 235 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec | 236 | chunk_write(e, &b); |
237 | ||
238 | /* --- Build the KEM chunk --- */ | |
239 | ||
240 | dstr_reset(&d); | |
241 | if (setupkem(km, &d, &cx, &c, &m)) | |
242 | die(EXIT_FAILURE, "failed to encapsulate key"); | |
243 | buf_init(&b, d.buf, d.len); | |
244 | BSTEP(&b, d.len); | |
f9e51332 | 245 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec | 246 | chunk_write(e, &b); |
247 | ||
c65df279 | 248 | /* --- Write the signature chunk --- */ |
249 | ||
250 | if (s) { | |
251 | GC_ENCRYPT(cx, 0, bb, 1024); | |
252 | GH_HASH(s->h, bb, 1024); | |
253 | dstr_reset(&d); | |
254 | if ((en = s->ops->doit(s, &d)) != 0) | |
255 | die(EXIT_FAILURE, "error creating signature: %s", key_strerror(en)); | |
256 | buf_init(&b, d.buf, d.len); | |
257 | BSTEP(&b, d.len); | |
258 | chunk_write(e, &b); | |
45c0fd36 | 259 | } |
c65df279 | 260 | |
5c3f75ec | 261 | /* --- Now do the main crypto --- */ |
262 | ||
cd6eca43 MW |
263 | if (f & f_progress) { |
264 | if (fprogress_init(&ff, fn, fp)) { | |
265 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
266 | strerror(errno)); | |
267 | } | |
268 | } | |
269 | ||
5c3f75ec | 270 | assert(GC_CLASS(c)->blksz <= sizeof(bb)); |
271 | dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); | |
272 | seq = 0; | |
f52f2db0 | 273 | chsz = MASK16 - GM_CLASS(m)->hashsz; |
5c3f75ec | 274 | for (;;) { |
275 | h = GM_INIT(m); | |
dfd1608a | 276 | GH_HASHU32(h, seq); |
5c3f75ec | 277 | seq++; |
278 | if (GC_CLASS(c)->blksz) { | |
279 | GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); | |
280 | GC_SETIV(c, bb); | |
281 | } | |
f52f2db0 | 282 | n = fread(bb, 1, chsz, fp); |
5c3f75ec | 283 | if (!n) break; |
cd6eca43 | 284 | if (f & f_progress) fprogress_update(&ff, n); |
5c3f75ec | 285 | buf_init(&b, d.buf, d.sz); |
286 | tag = buf_get(&b, GM_CLASS(m)->hashsz); | |
287 | ct = buf_get(&b, n); | |
288 | assert(tag); assert(ct); | |
289 | GC_ENCRYPT(c, bb, ct, n); | |
290 | GH_HASH(h, ct, n); | |
291 | GH_DONE(h, tag); | |
292 | GH_DESTROY(h); | |
293 | chunk_write(e, &b); | |
294 | } | |
295 | ||
296 | /* --- Final terminator packet --- */ | |
297 | ||
298 | buf_init(&b, d.buf, d.sz); | |
299 | tag = buf_get(&b, GM_CLASS(m)->hashsz); | |
300 | assert(tag); | |
301 | GH_DONE(h, tag); | |
302 | GH_DESTROY(h); | |
303 | chunk_write(e, &b); | |
304 | ||
305 | /* --- All done --- */ | |
306 | ||
cd6eca43 | 307 | if (f & f_progress) fprogress_done(&ff); |
5c3f75ec | 308 | e->ops->encdone(e); |
309 | GM_DESTROY(m); | |
310 | GC_DESTROY(c); | |
311 | GC_DESTROY(cx); | |
312 | freeenc(e); | |
c65df279 | 313 | if (s) freesig(s); |
5c3f75ec | 314 | freekem(km); |
ef13e9a4 | 315 | if (fp != stdin) fclose(fp); |
5c3f75ec | 316 | if (of) fclose(ofp); |
317 | key_close(&kf); | |
318 | dstr_destroy(&d); | |
319 | return (0); | |
320 | ||
321 | #undef f_bogus | |
946c3f72 | 322 | #undef f_nocheck |
cd6eca43 | 323 | #undef f_progress |
5c3f75ec | 324 | } |
325 | ||
326 | /*---- Decryption ---------------------------------------------------------*/ | |
327 | ||
328 | static int decrypt(int argc, char *argv[]) | |
329 | { | |
cd6eca43 | 330 | const char *fn, *of = 0; |
fa54fe1e | 331 | FILE *ofp = 0, *rfp = 0; |
5c3f75ec | 332 | FILE *fp = 0; |
333 | const char *ef = "binary"; | |
cd6eca43 | 334 | fprogress ff; |
5c3f75ec | 335 | int i; |
fa54fe1e | 336 | size_t n; |
5c3f75ec | 337 | dstr d = DSTR_INIT; |
338 | buf b; | |
339 | key_file kf; | |
340 | size_t seq; | |
341 | uint32 id; | |
342 | key *k; | |
c65df279 | 343 | key *sk = 0; |
5c3f75ec | 344 | kem *km; |
c65df279 | 345 | sig *s = 0; |
5c3f75ec | 346 | gcipher *cx; |
347 | gcipher *c; | |
348 | ghash *h; | |
349 | gmac *m; | |
350 | octet *tag; | |
351 | unsigned f = 0; | |
352 | const encops *eo; | |
c65df279 | 353 | const char *err; |
354 | int verb = 1; | |
5c3f75ec | 355 | enc *e; |
356 | ||
357 | #define f_bogus 1u | |
fa54fe1e | 358 | #define f_buffer 2u |
946c3f72 | 359 | #define f_nocheck 4u |
cd6eca43 | 360 | #define f_progress 8u |
5c3f75ec | 361 | |
362 | for (;;) { | |
363 | static const struct option opt[] = { | |
364 | { "armour", 0, 0, 'a' }, | |
365 | { "armor", 0, 0, 'a' }, | |
fa54fe1e | 366 | { "buffer", 0, 0, 'b' }, |
c65df279 | 367 | { "verbose", 0, 0, 'v' }, |
368 | { "quiet", 0, 0, 'q' }, | |
946c3f72 | 369 | { "nocheck", 0, 0, 'C' }, |
45c0fd36 MW |
370 | { "format", OPTF_ARGREQ, 0, 'f' }, |
371 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 372 | { "progress", 0, 0, 'p' }, |
5c3f75ec | 373 | { 0, 0, 0, 0 } |
374 | }; | |
cd6eca43 | 375 | i = mdwopt(argc, argv, "abf:o:pqvC", opt, 0, 0, 0); |
5c3f75ec | 376 | if (i < 0) break; |
377 | switch (i) { | |
378 | case 'a': ef = "pem"; break; | |
fa54fe1e | 379 | case 'b': f |= f_buffer; break; |
c65df279 | 380 | case 'v': verb++; break; |
381 | case 'q': if (verb) verb--; break; | |
946c3f72 | 382 | case 'C': f |= f_nocheck; break; |
5c3f75ec | 383 | case 'f': ef = optarg; break; |
384 | case 'o': of = optarg; break; | |
cd6eca43 | 385 | case 'p': f |= f_progress; break; |
5c3f75ec | 386 | default: f |= f_bogus; break; |
387 | } | |
388 | } | |
389 | if (argc - optind > 1 || (f & f_bogus)) | |
c65df279 | 390 | die(EXIT_FAILURE, "Usage: decrypt [-OPTIONS] [FILE]"); |
5c3f75ec | 391 | |
392 | if ((eo = getenc(ef)) == 0) | |
393 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
394 | ||
cd6eca43 MW |
395 | fn = optind < argc ? argv[optind++] : "-"; |
396 | if (strcmp(fn, "-") == 0) | |
5c3f75ec | 397 | fp = stdin; |
cd6eca43 | 398 | else if ((fp = fopen(fn, eo->rmode)) == 0) { |
5c3f75ec | 399 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
400 | fn, strerror(errno)); |
401 | } | |
5c3f75ec | 402 | |
213e565f | 403 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec | 404 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
405 | ||
fa54fe1e | 406 | e = initdec(eo, fp, checkbdry, "CATCRYPT ENCRYPTED MESSAGE"); |
5c3f75ec | 407 | |
cd6eca43 MW |
408 | if (f & f_progress) { |
409 | if (fprogress_init(&ff, fn, fp)) { | |
410 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
411 | strerror(errno)); | |
412 | } | |
413 | } | |
414 | ||
5c3f75ec | 415 | /* --- Read the header chunk --- */ |
416 | ||
417 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
418 | if (f & f_progress) |
419 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 420 | if (buf_getu32(&b, &id)) { |
cd6eca43 | 421 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 422 | if (verb) printf("FAIL malformed header: missing keyid\n"); |
423 | exit(EXIT_FAILURE); | |
424 | } | |
425 | if ((k = key_byid(&kf, id)) == 0) { | |
cd6eca43 | 426 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 427 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
428 | exit(EXIT_FAILURE); | |
429 | } | |
430 | if (BLEFT(&b)) { | |
431 | if (buf_getu32(&b, &id)) { | |
cd6eca43 | 432 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 433 | if (verb) printf("FAIL malformed header: missing signature keyid\n"); |
434 | exit(EXIT_FAILURE); | |
435 | } | |
436 | if ((sk = key_byid(&kf, id)) == 0) { | |
cd6eca43 | 437 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 438 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
439 | exit(EXIT_FAILURE); | |
440 | } | |
441 | } | |
442 | if (BLEFT(&b)) { | |
cd6eca43 | 443 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 444 | if (verb) printf("FAIL malformed header: junk at end\n"); |
445 | exit(EXIT_FAILURE); | |
446 | } | |
f9e51332 | 447 | if (sk) { |
448 | s = getsig(sk, "ccsig", 0); | |
449 | if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0) { | |
450 | dstr_reset(&d); | |
451 | key_fulltag(sk, &d); | |
452 | printf("WARN verification key %s fails check: %s\n", d.buf, err); | |
453 | } | |
454 | GH_HASHBUF16(s->h, BBASE(&b), BSZ(&b)); | |
455 | } | |
5c3f75ec | 456 | |
457 | /* --- Find the key --- */ | |
458 | ||
c65df279 | 459 | km = getkem(k, "cckem", 1); |
5c3f75ec | 460 | |
461 | /* --- Read the KEM chunk --- */ | |
462 | ||
463 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
464 | if (f & f_progress) |
465 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 466 | if (setupkem(km, &d, &cx, &c, &m)) { |
cd6eca43 | 467 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 468 | if (verb) printf("FAIL failed to decapsulate key\n"); |
469 | exit(EXIT_FAILURE); | |
470 | } | |
f9e51332 | 471 | if (s) GH_HASHBUF16(s->h, d.buf, d.len); |
c65df279 | 472 | |
473 | /* --- Verify the signature, if there is one --- */ | |
474 | ||
475 | if (sk) { | |
c65df279 | 476 | dstr_reset(&d); |
477 | dstr_ensure(&d, 1024); | |
478 | GC_ENCRYPT(cx, 0, d.buf, 1024); | |
479 | GH_HASH(s->h, d.buf, 1024); | |
480 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
481 | if (f & f_progress) |
482 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 483 | if (s->ops->doit(s, &d)) { |
cd6eca43 | 484 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 485 | if (verb) printf("FAIL signature verification failed\n"); |
486 | exit(EXIT_FAILURE); | |
487 | } | |
488 | if (verb) { | |
489 | dstr_reset(&d); | |
490 | key_fulltag(sk, &d); | |
cd6eca43 | 491 | if (f & f_progress) fprogress_clear(&ff); |
fa54fe1e | 492 | printf("INFO good-signature %s\n", d.buf); |
c65df279 | 493 | } |
ef13e9a4 | 494 | freesig(s); |
cd6eca43 MW |
495 | } else if (verb) { |
496 | if (f & f_progress) fprogress_clear(&ff); | |
fa54fe1e | 497 | printf("INFO no-signature\n"); |
cd6eca43 | 498 | } |
5c3f75ec | 499 | |
500 | /* --- Now decrypt the main body --- */ | |
501 | ||
c65df279 | 502 | if (!of || strcmp(of, "-") == 0) { |
5c3f75ec | 503 | ofp = stdout; |
fa54fe1e | 504 | f |= f_buffer; |
5c3f75ec | 505 | } |
fa54fe1e | 506 | if (!(f & f_buffer)) { |
507 | if ((ofp = fopen(of, "wb")) == 0) { | |
cd6eca43 | 508 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 509 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
9b1663a5 | 510 | of, strerror(errno)); |
fa54fe1e | 511 | } |
512 | rfp = ofp; | |
cd6eca43 MW |
513 | } else if ((rfp = tmpfile()) == 0) { |
514 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 515 | die(EXIT_FAILURE, "couldn't create temporary file: %s", strerror(errno)); |
cd6eca43 | 516 | } |
5c3f75ec | 517 | |
518 | seq = 0; | |
519 | dstr_ensure(&d, GC_CLASS(c)->blksz); | |
520 | dstr_ensure(&d, 4); | |
521 | for (;;) { | |
522 | if (GC_CLASS(c)->blksz) { | |
523 | GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); | |
524 | GC_SETIV(c, d.buf); | |
525 | } | |
526 | h = GM_INIT(m); | |
dfd1608a | 527 | GH_HASHU32(h, seq); |
5c3f75ec | 528 | seq++; |
529 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
530 | if (f & f_progress) |
531 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 532 | if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) { |
cd6eca43 | 533 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 534 | if (verb) printf("FAIL bad ciphertext chunk: no tag\n"); |
c65df279 | 535 | exit(EXIT_FAILURE); |
536 | } | |
5c3f75ec | 537 | GH_HASH(h, BCUR(&b), BLEFT(&b)); |
da4489a6 | 538 | if (!ct_memeq(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz)) { |
cd6eca43 | 539 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 540 | if (verb) |
fa54fe1e | 541 | printf("FAIL bad ciphertext chunk: authentication failure\n"); |
c65df279 | 542 | exit(EXIT_FAILURE); |
543 | } | |
ef13e9a4 | 544 | GH_DESTROY(h); |
5c3f75ec | 545 | if (!BLEFT(&b)) |
546 | break; | |
547 | GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); | |
fa54fe1e | 548 | if (fwrite(BCUR(&b), 1, BLEFT(&b), rfp) != BLEFT(&b)) { |
cd6eca43 | 549 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 550 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); |
c65df279 | 551 | exit(EXIT_FAILURE); |
552 | } | |
553 | } | |
554 | ||
cd6eca43 | 555 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 556 | if (fflush(rfp) || ferror(rfp)) { |
557 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); | |
c65df279 | 558 | exit(EXIT_FAILURE); |
5c3f75ec | 559 | } |
fa54fe1e | 560 | if (f & f_buffer) { |
561 | if (!ofp && (ofp = fopen(of, "wb")) == 0) { | |
562 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
563 | of, strerror(errno)); | |
564 | } | |
565 | rewind(rfp); | |
cd6eca43 | 566 | if (f & f_progress) fprogress_init(&ff, "copying buffer", rfp); |
fa54fe1e | 567 | dstr_reset(&d); |
568 | dstr_ensure(&d, 65536); | |
64459c98 | 569 | if (verb && ofp == stdout) printf("DATA\n"); |
fa54fe1e | 570 | for (;;) { |
571 | n = fread(d.buf, 1, d.sz, rfp); | |
572 | if (!n) break; | |
cd6eca43 MW |
573 | if (f & f_progress) fprogress_update(&ff, n); |
574 | if (fwrite(d.buf, 1, n, ofp) < n) { | |
575 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 576 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
cd6eca43 | 577 | } |
fa54fe1e | 578 | } |
cd6eca43 | 579 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 580 | if (ferror(rfp) || fclose(rfp)) |
581 | die(EXIT_FAILURE, "error unbuffering output: %s", strerror(errno)); | |
582 | } | |
5c3f75ec | 583 | |
5c3f75ec | 584 | e->ops->decdone(e); |
c65df279 | 585 | if (verb && ofp != stdout) |
586 | printf("OK decrypted successfully\n"); | |
f0c52873 MW |
587 | if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp))) |
588 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
5c3f75ec | 589 | freeenc(e); |
590 | GC_DESTROY(c); | |
591 | GC_DESTROY(cx); | |
592 | GM_DESTROY(m); | |
593 | freekem(km); | |
ef13e9a4 | 594 | if (fp != stdin) fclose(fp); |
5c3f75ec | 595 | key_close(&kf); |
596 | dstr_destroy(&d); | |
597 | return (0); | |
598 | ||
599 | #undef f_bogus | |
fa54fe1e | 600 | #undef f_buffer |
946c3f72 | 601 | #undef f_nocheck |
cd6eca43 | 602 | #undef f_progress |
5c3f75ec | 603 | } |
604 | ||
605 | /*----- Main code ---------------------------------------------------------*/ | |
606 | ||
c65df279 | 607 | #define LISTS(LI) \ |
608 | LI("Lists", list, \ | |
609 | listtab[i].name, listtab[i].name) \ | |
610 | LI("Key-encapsulation mechanisms", kem, \ | |
611 | kemtab[i].name, kemtab[i].name) \ | |
612 | LI("Signature schemes", sig, \ | |
613 | sigtab[i].name, sigtab[i].name) \ | |
614 | LI("Encodings", enc, \ | |
615 | enctab[i].name, enctab[i].name) \ | |
616 | LI("Symmetric encryption algorithms", cipher, \ | |
617 | gciphertab[i], gciphertab[i]->name) \ | |
618 | LI("Hash functions", hash, \ | |
619 | ghashtab[i], ghashtab[i]->name) \ | |
620 | LI("Message authentication codes", mac, \ | |
621 | gmactab[i], gmactab[i]->name) | |
622 | ||
623 | MAKELISTTAB(listtab, LISTS) | |
624 | ||
625 | int cmd_show(int argc, char *argv[]) | |
626 | { | |
627 | return (displaylists(listtab, argv + 1)); | |
628 | } | |
629 | ||
630 | static int cmd_help(int, char **); | |
5c3f75ec | 631 | |
632 | static cmd cmdtab[] = { | |
c65df279 | 633 | { "help", cmd_help, "help [COMMAND...]" }, |
634 | { "show", cmd_show, "show [ITEM...]" }, | |
fa54fe1e | 635 | CMD_ENCODE, |
636 | CMD_DECODE, | |
5c3f75ec | 637 | { "encrypt", encrypt, |
cd6eca43 | 638 | "encrypt [-apC] [-k TAG] [-s TAG] [-f FORMAT]\n\t\ |
c65df279 | 639 | [-o OUTPUT] [FILE]", "\ |
5c3f75ec | 640 | Options:\n\ |
641 | \n\ | |
642 | -a, --armour Same as `-f pem'.\n\ | |
643 | -f, --format=FORMAT Encode as FORMAT.\n\ | |
c65df279 | 644 | -k, --key=TAG Use public encryption key named by TAG.\n\ |
645 | -s, --sign-key=TAG Use private signature key named by TAG.\n\ | |
5c3f75ec | 646 | -o, --output=FILE Write output to FILE.\n\ |
cd6eca43 | 647 | -p, --progress Show progress on large files.\n\ |
946c3f72 | 648 | -C, --nocheck Don't check the public key.\n\ |
5c3f75ec | 649 | " }, |
650 | { "decrypt", decrypt, | |
cd6eca43 | 651 | "decrypt [-abpqvC] [-f FORMAT] [-o OUTPUT] [FILE]", "\ |
5c3f75ec | 652 | Options:\n\ |
653 | \n\ | |
c65df279 | 654 | -a, --armour Same as `-f pem'.\n\ |
fa54fe1e | 655 | -b, --buffer Buffer output until we're sure we have it all.\n\ |
c65df279 | 656 | -f, --format=FORMAT Decode as FORMAT.\n\ |
5c3f75ec | 657 | -o, --output=FILE Write output to FILE.\n\ |
cd6eca43 | 658 | -p, --progress Show progress on large files.\n\ |
fa54fe1e | 659 | -q, --quiet Produce fewer messages.\n\ |
660 | -v, --verbose Produce more verbose messages.\n\ | |
946c3f72 | 661 | -C, --nocheck Don't check the private key.\n\ |
cd6eca43 | 662 | " }, |
5c3f75ec | 663 | { 0, 0, 0 } |
664 | }; | |
665 | ||
c65df279 | 666 | static int cmd_help(int argc, char **argv) |
5c3f75ec | 667 | { |
c65df279 | 668 | sc_help(cmdtab, stdout, argv + 1); |
669 | return (0); | |
5c3f75ec | 670 | } |
671 | ||
c65df279 | 672 | void version(FILE *fp) |
5c3f75ec | 673 | { |
674 | pquis(fp, "$, Catacomb version " VERSION "\n"); | |
675 | } | |
676 | ||
677 | static void usage(FILE *fp) | |
678 | { | |
c65df279 | 679 | pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n"); |
5c3f75ec | 680 | } |
681 | ||
c65df279 | 682 | void help_global(FILE *fp) |
5c3f75ec | 683 | { |
c65df279 | 684 | usage(fp); |
685 | fputs("\n\ | |
ada55141 | 686 | Encrypt and decrypt files.\n\ |
c65df279 | 687 | \n\ |
688 | Global command-line options:\n\ | |
689 | \n\ | |
690 | -h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\ | |
691 | -v, --version Show program version number.\n\ | |
692 | -u, --usage Show a terse usage message.\n\ | |
693 | \n\ | |
694 | -k, --keyring=FILE Read keys from FILE.\n", | |
695 | fp); | |
5c3f75ec | 696 | } |
697 | ||
698 | /* --- @main@ --- * | |
699 | * | |
700 | * Arguments: @int argc@ = number of command line arguments | |
701 | * @char *argv[]@ = vector of command line arguments | |
702 | * | |
703 | * Returns: Zero if successful, nonzero otherwise. | |
704 | * | |
c65df279 | 705 | * Use: Encrypts or decrypts files. |
5c3f75ec | 706 | */ |
707 | ||
708 | int main(int argc, char *argv[]) | |
709 | { | |
710 | unsigned f = 0; | |
711 | ||
712 | #define f_bogus 1u | |
713 | ||
714 | /* --- Initialize the library --- */ | |
715 | ||
716 | ego(argv[0]); | |
717 | sub_init(); | |
718 | rand_noisesrc(RAND_GLOBAL, &noise_source); | |
719 | rand_seed(RAND_GLOBAL, 160); | |
720 | ||
721 | /* --- Parse options --- */ | |
722 | ||
723 | for (;;) { | |
724 | static struct option opts[] = { | |
725 | { "help", 0, 0, 'h' }, | |
726 | { "version", 0, 0, 'v' }, | |
727 | { "usage", 0, 0, 'u' }, | |
728 | { "keyring", OPTF_ARGREQ, 0, 'k' }, | |
729 | { 0, 0, 0, 0 } | |
730 | }; | |
731 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); | |
732 | if (i < 0) | |
733 | break; | |
734 | switch (i) { | |
735 | case 'h': | |
c65df279 | 736 | sc_help(cmdtab, stdout, argv + optind); |
5c3f75ec | 737 | exit(0); |
738 | break; | |
739 | case 'v': | |
740 | version(stdout); | |
741 | exit(0); | |
742 | break; | |
743 | case 'u': | |
744 | usage(stdout); | |
745 | exit(0); | |
746 | case 'k': | |
747 | keyring = optarg; | |
748 | break; | |
749 | default: | |
750 | f |= f_bogus; | |
751 | break; | |
752 | } | |
753 | } | |
754 | ||
755 | argc -= optind; | |
756 | argv += optind; | |
757 | optind = 0; | |
758 | if (f & f_bogus || argc < 1) { | |
759 | usage(stderr); | |
760 | exit(EXIT_FAILURE); | |
761 | } | |
762 | ||
763 | /* --- Dispatch to the correct subcommand handler --- */ | |
764 | ||
c65df279 | 765 | return (findcmd(cmdtab, argv[0])->cmd(argc, argv)); |
5c3f75ec | 766 | |
767 | #undef f_bogus | |
768 | } | |
769 | ||
770 | /*----- That's all, folks -------------------------------------------------*/ |