Commit | Line | Data |
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5c3f75ec | 1 | /* -*-c-*- |
2 | * | |
c65df279 | 3 | * $Id$ |
5c3f75ec | 4 | * |
5 | * Command-line encryption tool | |
6 | * | |
7 | * (c) 2004 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
5c3f75ec | 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. | |
45c0fd36 | 18 | * |
5c3f75ec | 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. | |
45c0fd36 | 23 | * |
5c3f75ec | 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 | ||
cd6eca43 MW |
32 | #define _FILE_OFFSET_BITS 64 |
33 | ||
5c3f75ec | 34 | #include "config.h" |
35 | ||
36 | #include <errno.h> | |
37 | #include <stdio.h> | |
38 | #include <stdlib.h> | |
39 | #include <string.h> | |
40 | ||
41 | #include <mLib/base64.h> | |
42 | #include <mLib/dstr.h> | |
43 | #include <mLib/mdwopt.h> | |
44 | #include <mLib/quis.h> | |
45 | #include <mLib/report.h> | |
46 | #include <mLib/sub.h> | |
47 | ||
48 | #include "buf.h" | |
49 | #include "rand.h" | |
50 | #include "noise.h" | |
51 | #include "mprand.h" | |
52 | #include "key.h" | |
53 | #include "cc.h" | |
54 | ||
c65df279 | 55 | #include "ectab.h" |
56 | #include "ptab.h" | |
57 | ||
5c3f75ec | 58 | /*----- Static variables --------------------------------------------------*/ |
59 | ||
60 | static const char *keyring = "keyring"; | |
61 | ||
62 | /*----- Data format -------------------------------------------------------*/ | |
63 | ||
64 | /* --- Overview --- * | |
65 | * | |
66 | * The encrypted message is divided into chunks, each preceded by a two-octet | |
67 | * length. The chunks don't need to be large -- the idea is that we can | |
68 | * stream the chunks in and out. | |
69 | * | |
70 | * The first chunk is a header. It contains the decryption key-id, and maybe | |
71 | * the verification key-id if the message is signed. | |
72 | * | |
73 | * Next comes the key-encapsulation chunk. This is decrypted in some | |
38b90111 | 74 | * KEM-specific way to yield a secret hash. The hash is expanded using an |
75 | * MGF (or similar) to make a symmetric encryption and MAC key. | |
5c3f75ec | 76 | * |
77 | * If the message is signed, there comes a signature chunk. The signature is | |
f9e51332 | 78 | * on the header and key-encapsulation chunks, and further output of the MGF. |
79 | * This means that the recipient can modify the message and still have a | |
80 | * valid signature, so it's not useful for proving things to other people; | |
81 | * but it also means that the recipient knows that the message is from | |
82 | * someone who knows the hash, which limits the possiblities to (a) whoever | |
83 | * encrypted the message (good!) and (b) whoever knows the recipient's | |
84 | * private key. | |
5c3f75ec | 85 | * |
86 | * Then come message chunks. Each one begins with a MAC over an implicit | |
87 | * sequence number and the ciphertext. The final chunk's ciphertext is | |
88 | * empty; no other chunk is empty. Thus can the correct end-of-file be | |
89 | * discerned. | |
90 | */ | |
91 | ||
92 | /*----- Chunk I/O ---------------------------------------------------------*/ | |
93 | ||
94 | static void chunk_write(enc *e, buf *b) | |
95 | { | |
96 | octet l[2]; | |
97 | size_t n = BLEN(b); | |
98 | assert(n <= MASK16); | |
99 | STORE16(l, n); | |
100 | if (e->ops->write(e, l, 2) || | |
101 | e->ops->write(e, BBASE(b), BLEN(b))) | |
102 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
103 | } | |
104 | ||
105 | static void chunk_read(enc *e, dstr *d, buf *b) | |
106 | { | |
107 | octet l[2]; | |
108 | size_t n; | |
109 | ||
110 | dstr_reset(d); | |
111 | errno = 0; | |
112 | if (e->ops->read(e, l, 2) != 2) | |
113 | goto err; | |
114 | n = LOAD16(l); | |
115 | dstr_ensure(d, n); | |
116 | if (e->ops->read(e, d->buf, n) != n) | |
117 | goto err; | |
118 | d->len = n; | |
119 | buf_init(b, d->buf, d->len); | |
120 | return; | |
121 | ||
122 | err: | |
123 | if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); | |
124 | else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); | |
125 | } | |
126 | ||
127 | /*----- Encryption --------------------------------------------------------*/ | |
128 | ||
129 | static int encrypt(int argc, char *argv[]) | |
130 | { | |
cd6eca43 | 131 | const char *fn, *of = 0, *kn = "ccrypt", *skn = 0; |
5c3f75ec | 132 | FILE *ofp = 0; |
133 | FILE *fp = 0; | |
134 | const char *ef = "binary"; | |
cd6eca43 | 135 | fprogress ff; |
5c3f75ec | 136 | const char *err; |
137 | int i; | |
c65df279 | 138 | int en; |
f52f2db0 | 139 | size_t n, chsz; |
5c3f75ec | 140 | dstr d = DSTR_INIT; |
141 | octet *tag, *ct; | |
142 | buf b; | |
143 | size_t seq; | |
188f51de | 144 | char bb[65536]; |
5c3f75ec | 145 | unsigned f = 0; |
146 | key_file kf; | |
147 | key *k; | |
c65df279 | 148 | key *sk = 0; |
5c3f75ec | 149 | kem *km; |
c65df279 | 150 | sig *s = 0; |
5c3f75ec | 151 | gcipher *cx, *c; |
152 | gmac *m; | |
153 | ghash *h; | |
154 | const encops *eo; | |
155 | enc *e; | |
156 | ||
157 | #define f_bogus 1u | |
946c3f72 | 158 | #define f_nocheck 2u |
cd6eca43 | 159 | #define f_progress 4u |
5c3f75ec | 160 | |
161 | for (;;) { | |
162 | static const struct option opt[] = { | |
163 | { "key", OPTF_ARGREQ, 0, 'k' }, | |
c65df279 | 164 | { "sign-key", OPTF_ARGREQ, 0, 's' }, |
5c3f75ec | 165 | { "armour", 0, 0, 'a' }, |
166 | { "armor", 0, 0, 'a' }, | |
45c0fd36 MW |
167 | { "format", OPTF_ARGREQ, 0, 'f' }, |
168 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 169 | { "progress", 0, 0, 'p' }, |
946c3f72 | 170 | { "nocheck", 0, 0, 'C' }, |
5c3f75ec | 171 | { 0, 0, 0, 0 } |
172 | }; | |
cd6eca43 | 173 | i = mdwopt(argc, argv, "k:s:af:o:pC", opt, 0, 0, 0); |
5c3f75ec | 174 | if (i < 0) break; |
175 | switch (i) { | |
176 | case 'k': kn = optarg; break; | |
c65df279 | 177 | case 's': skn = optarg; break; |
5c3f75ec | 178 | case 'a': ef = "pem"; break; |
179 | case 'f': ef = optarg; break; | |
180 | case 'o': of = optarg; break; | |
cd6eca43 | 181 | case 'p': f |= f_progress; break; |
946c3f72 | 182 | case 'C': f |= f_nocheck; break; |
5c3f75ec | 183 | default: f |= f_bogus; break; |
184 | } | |
185 | } | |
186 | if (argc - optind > 1 || (f & f_bogus)) | |
c65df279 | 187 | die(EXIT_FAILURE, "Usage: encrypt [-OPTIONS] [FILE]"); |
5c3f75ec | 188 | |
213e565f | 189 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec | 190 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
191 | if ((k = key_bytag(&kf, kn)) == 0) | |
192 | die(EXIT_FAILURE, "key `%s' not found", kn); | |
c65df279 | 193 | if (skn && (sk = key_bytag(&kf, skn)) == 0) |
194 | die(EXIT_FAILURE, "key `%s' not found", skn); | |
5c3f75ec | 195 | |
196 | if ((eo = getenc(ef)) == 0) | |
197 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
198 | ||
cd6eca43 MW |
199 | fn = optind < argc ? argv[optind++] : "-"; |
200 | if (strcmp(fn, "-") == 0) | |
5c3f75ec | 201 | fp = stdin; |
cd6eca43 | 202 | else if ((fp = fopen(fn, "rb")) == 0) { |
5c3f75ec | 203 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
204 | fn, strerror(errno)); |
205 | } | |
5c3f75ec | 206 | |
207 | if (!of || strcmp(of, "-") == 0) | |
208 | ofp = stdout; | |
209 | else if ((ofp = fopen(of, eo->wmode)) == 0) { | |
210 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
211 | ofp, strerror(errno)); | |
212 | } | |
213 | ||
c65df279 | 214 | dstr_reset(&d); |
5c3f75ec | 215 | key_fulltag(k, &d); |
fa54fe1e | 216 | e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE"); |
c65df279 | 217 | km = getkem(k, "cckem", 0); |
946c3f72 | 218 | if (!(f & f_nocheck) && (err = km->ops->check(km)) != 0) |
fa54fe1e | 219 | moan("key %s fails check: %s", d.buf, err); |
c65df279 | 220 | if (sk) { |
221 | dstr_reset(&d); | |
222 | key_fulltag(sk, &d); | |
223 | s = getsig(sk, "ccsig", 1); | |
224 | if ((err = s->ops->check(s)) != 0) | |
fa54fe1e | 225 | moan("key %s fails check: %s", d.buf, err); |
c65df279 | 226 | } |
5c3f75ec | 227 | |
228 | /* --- Build the header chunk --- */ | |
229 | ||
230 | dstr_reset(&d); | |
231 | dstr_ensure(&d, 256); | |
232 | buf_init(&b, d.buf, 256); | |
233 | buf_putu32(&b, k->id); | |
c65df279 | 234 | if (sk) buf_putu32(&b, sk->id); |
5c3f75ec | 235 | assert(BOK(&b)); |
f9e51332 | 236 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec | 237 | chunk_write(e, &b); |
238 | ||
239 | /* --- Build the KEM chunk --- */ | |
240 | ||
241 | dstr_reset(&d); | |
242 | if (setupkem(km, &d, &cx, &c, &m)) | |
243 | die(EXIT_FAILURE, "failed to encapsulate key"); | |
244 | buf_init(&b, d.buf, d.len); | |
245 | BSTEP(&b, d.len); | |
f9e51332 | 246 | if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); |
5c3f75ec | 247 | chunk_write(e, &b); |
248 | ||
c65df279 | 249 | /* --- Write the signature chunk --- */ |
250 | ||
251 | if (s) { | |
252 | GC_ENCRYPT(cx, 0, bb, 1024); | |
253 | GH_HASH(s->h, bb, 1024); | |
254 | dstr_reset(&d); | |
255 | if ((en = s->ops->doit(s, &d)) != 0) | |
256 | die(EXIT_FAILURE, "error creating signature: %s", key_strerror(en)); | |
257 | buf_init(&b, d.buf, d.len); | |
258 | BSTEP(&b, d.len); | |
259 | chunk_write(e, &b); | |
45c0fd36 | 260 | } |
c65df279 | 261 | |
5c3f75ec | 262 | /* --- Now do the main crypto --- */ |
263 | ||
cd6eca43 MW |
264 | if (f & f_progress) { |
265 | if (fprogress_init(&ff, fn, fp)) { | |
266 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
267 | strerror(errno)); | |
268 | } | |
269 | } | |
270 | ||
5c3f75ec | 271 | assert(GC_CLASS(c)->blksz <= sizeof(bb)); |
272 | dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); | |
273 | seq = 0; | |
f52f2db0 | 274 | chsz = MASK16 - GM_CLASS(m)->hashsz; |
5c3f75ec | 275 | for (;;) { |
276 | h = GM_INIT(m); | |
dfd1608a | 277 | GH_HASHU32(h, seq); |
5c3f75ec | 278 | seq++; |
279 | if (GC_CLASS(c)->blksz) { | |
280 | GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); | |
281 | GC_SETIV(c, bb); | |
282 | } | |
f52f2db0 | 283 | n = fread(bb, 1, chsz, fp); |
5c3f75ec | 284 | if (!n) break; |
cd6eca43 | 285 | if (f & f_progress) fprogress_update(&ff, n); |
5c3f75ec | 286 | buf_init(&b, d.buf, d.sz); |
287 | tag = buf_get(&b, GM_CLASS(m)->hashsz); | |
288 | ct = buf_get(&b, n); | |
289 | assert(tag); assert(ct); | |
290 | GC_ENCRYPT(c, bb, ct, n); | |
291 | GH_HASH(h, ct, n); | |
292 | GH_DONE(h, tag); | |
293 | GH_DESTROY(h); | |
294 | chunk_write(e, &b); | |
295 | } | |
296 | ||
297 | /* --- Final terminator packet --- */ | |
298 | ||
299 | buf_init(&b, d.buf, d.sz); | |
300 | tag = buf_get(&b, GM_CLASS(m)->hashsz); | |
301 | assert(tag); | |
302 | GH_DONE(h, tag); | |
303 | GH_DESTROY(h); | |
304 | chunk_write(e, &b); | |
305 | ||
306 | /* --- All done --- */ | |
307 | ||
cd6eca43 | 308 | if (f & f_progress) fprogress_done(&ff); |
5c3f75ec | 309 | e->ops->encdone(e); |
310 | GM_DESTROY(m); | |
311 | GC_DESTROY(c); | |
312 | GC_DESTROY(cx); | |
313 | freeenc(e); | |
c65df279 | 314 | if (s) freesig(s); |
5c3f75ec | 315 | freekem(km); |
ef13e9a4 | 316 | if (fp != stdin) fclose(fp); |
5c3f75ec | 317 | if (of) fclose(ofp); |
318 | key_close(&kf); | |
319 | dstr_destroy(&d); | |
320 | return (0); | |
321 | ||
322 | #undef f_bogus | |
946c3f72 | 323 | #undef f_nocheck |
cd6eca43 | 324 | #undef f_progress |
5c3f75ec | 325 | } |
326 | ||
327 | /*---- Decryption ---------------------------------------------------------*/ | |
328 | ||
329 | static int decrypt(int argc, char *argv[]) | |
330 | { | |
cd6eca43 | 331 | const char *fn, *of = 0; |
fa54fe1e | 332 | FILE *ofp = 0, *rfp = 0; |
5c3f75ec | 333 | FILE *fp = 0; |
334 | const char *ef = "binary"; | |
cd6eca43 | 335 | fprogress ff; |
5c3f75ec | 336 | int i; |
fa54fe1e | 337 | size_t n; |
5c3f75ec | 338 | dstr d = DSTR_INIT; |
339 | buf b; | |
340 | key_file kf; | |
341 | size_t seq; | |
342 | uint32 id; | |
343 | key *k; | |
c65df279 | 344 | key *sk = 0; |
5c3f75ec | 345 | kem *km; |
c65df279 | 346 | sig *s = 0; |
5c3f75ec | 347 | gcipher *cx; |
348 | gcipher *c; | |
349 | ghash *h; | |
350 | gmac *m; | |
351 | octet *tag; | |
352 | unsigned f = 0; | |
353 | const encops *eo; | |
c65df279 | 354 | const char *err; |
355 | int verb = 1; | |
5c3f75ec | 356 | enc *e; |
357 | ||
358 | #define f_bogus 1u | |
fa54fe1e | 359 | #define f_buffer 2u |
946c3f72 | 360 | #define f_nocheck 4u |
cd6eca43 | 361 | #define f_progress 8u |
5c3f75ec | 362 | |
363 | for (;;) { | |
364 | static const struct option opt[] = { | |
365 | { "armour", 0, 0, 'a' }, | |
366 | { "armor", 0, 0, 'a' }, | |
fa54fe1e | 367 | { "buffer", 0, 0, 'b' }, |
c65df279 | 368 | { "verbose", 0, 0, 'v' }, |
369 | { "quiet", 0, 0, 'q' }, | |
946c3f72 | 370 | { "nocheck", 0, 0, 'C' }, |
45c0fd36 MW |
371 | { "format", OPTF_ARGREQ, 0, 'f' }, |
372 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
cd6eca43 | 373 | { "progress", 0, 0, 'p' }, |
5c3f75ec | 374 | { 0, 0, 0, 0 } |
375 | }; | |
cd6eca43 | 376 | i = mdwopt(argc, argv, "abf:o:pqvC", opt, 0, 0, 0); |
5c3f75ec | 377 | if (i < 0) break; |
378 | switch (i) { | |
379 | case 'a': ef = "pem"; break; | |
fa54fe1e | 380 | case 'b': f |= f_buffer; break; |
c65df279 | 381 | case 'v': verb++; break; |
382 | case 'q': if (verb) verb--; break; | |
946c3f72 | 383 | case 'C': f |= f_nocheck; break; |
5c3f75ec | 384 | case 'f': ef = optarg; break; |
385 | case 'o': of = optarg; break; | |
cd6eca43 | 386 | case 'p': f |= f_progress; break; |
5c3f75ec | 387 | default: f |= f_bogus; break; |
388 | } | |
389 | } | |
390 | if (argc - optind > 1 || (f & f_bogus)) | |
c65df279 | 391 | die(EXIT_FAILURE, "Usage: decrypt [-OPTIONS] [FILE]"); |
5c3f75ec | 392 | |
393 | if ((eo = getenc(ef)) == 0) | |
394 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
395 | ||
cd6eca43 MW |
396 | fn = optind < argc ? argv[optind++] : "-"; |
397 | if (strcmp(fn, "-") == 0) | |
5c3f75ec | 398 | fp = stdin; |
cd6eca43 | 399 | else if ((fp = fopen(fn, eo->rmode)) == 0) { |
5c3f75ec | 400 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
cd6eca43 MW |
401 | fn, strerror(errno)); |
402 | } | |
5c3f75ec | 403 | |
213e565f | 404 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
5c3f75ec | 405 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
406 | ||
fa54fe1e | 407 | e = initdec(eo, fp, checkbdry, "CATCRYPT ENCRYPTED MESSAGE"); |
5c3f75ec | 408 | |
cd6eca43 MW |
409 | if (f & f_progress) { |
410 | if (fprogress_init(&ff, fn, fp)) { | |
411 | die(EXIT_FAILURE, "failed to initialize progress display: %s", | |
412 | strerror(errno)); | |
413 | } | |
414 | } | |
415 | ||
5c3f75ec | 416 | /* --- Read the header chunk --- */ |
417 | ||
418 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
419 | if (f & f_progress) |
420 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 421 | if (buf_getu32(&b, &id)) { |
cd6eca43 | 422 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 423 | if (verb) printf("FAIL malformed header: missing keyid\n"); |
424 | exit(EXIT_FAILURE); | |
425 | } | |
426 | if ((k = key_byid(&kf, id)) == 0) { | |
cd6eca43 | 427 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 428 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
429 | exit(EXIT_FAILURE); | |
430 | } | |
431 | if (BLEFT(&b)) { | |
432 | if (buf_getu32(&b, &id)) { | |
cd6eca43 | 433 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 434 | if (verb) printf("FAIL malformed header: missing signature keyid\n"); |
435 | exit(EXIT_FAILURE); | |
436 | } | |
437 | if ((sk = key_byid(&kf, id)) == 0) { | |
cd6eca43 | 438 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 439 | if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); |
440 | exit(EXIT_FAILURE); | |
441 | } | |
442 | } | |
443 | if (BLEFT(&b)) { | |
cd6eca43 | 444 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 445 | if (verb) printf("FAIL malformed header: junk at end\n"); |
446 | exit(EXIT_FAILURE); | |
447 | } | |
f9e51332 | 448 | if (sk) { |
449 | s = getsig(sk, "ccsig", 0); | |
450 | if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0) { | |
451 | dstr_reset(&d); | |
452 | key_fulltag(sk, &d); | |
453 | printf("WARN verification key %s fails check: %s\n", d.buf, err); | |
454 | } | |
455 | GH_HASHBUF16(s->h, BBASE(&b), BSZ(&b)); | |
456 | } | |
5c3f75ec | 457 | |
458 | /* --- Find the key --- */ | |
459 | ||
c65df279 | 460 | km = getkem(k, "cckem", 1); |
5c3f75ec | 461 | |
462 | /* --- Read the KEM chunk --- */ | |
463 | ||
464 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
465 | if (f & f_progress) |
466 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 467 | if (setupkem(km, &d, &cx, &c, &m)) { |
cd6eca43 | 468 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 469 | if (verb) printf("FAIL failed to decapsulate key\n"); |
470 | exit(EXIT_FAILURE); | |
471 | } | |
f9e51332 | 472 | if (s) GH_HASHBUF16(s->h, d.buf, d.len); |
c65df279 | 473 | |
474 | /* --- Verify the signature, if there is one --- */ | |
475 | ||
476 | if (sk) { | |
c65df279 | 477 | dstr_reset(&d); |
478 | dstr_ensure(&d, 1024); | |
479 | GC_ENCRYPT(cx, 0, d.buf, 1024); | |
480 | GH_HASH(s->h, d.buf, 1024); | |
481 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
482 | if (f & f_progress) |
483 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 484 | if (s->ops->doit(s, &d)) { |
cd6eca43 | 485 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 486 | if (verb) printf("FAIL signature verification failed\n"); |
487 | exit(EXIT_FAILURE); | |
488 | } | |
489 | if (verb) { | |
490 | dstr_reset(&d); | |
491 | key_fulltag(sk, &d); | |
cd6eca43 | 492 | if (f & f_progress) fprogress_clear(&ff); |
fa54fe1e | 493 | printf("INFO good-signature %s\n", d.buf); |
c65df279 | 494 | } |
ef13e9a4 | 495 | freesig(s); |
cd6eca43 MW |
496 | } else if (verb) { |
497 | if (f & f_progress) fprogress_clear(&ff); | |
fa54fe1e | 498 | printf("INFO no-signature\n"); |
cd6eca43 | 499 | } |
5c3f75ec | 500 | |
501 | /* --- Now decrypt the main body --- */ | |
502 | ||
c65df279 | 503 | if (!of || strcmp(of, "-") == 0) { |
5c3f75ec | 504 | ofp = stdout; |
fa54fe1e | 505 | f |= f_buffer; |
5c3f75ec | 506 | } |
fa54fe1e | 507 | if (!(f & f_buffer)) { |
508 | if ((ofp = fopen(of, "wb")) == 0) { | |
cd6eca43 | 509 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 510 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
511 | ofp, strerror(errno)); | |
512 | } | |
513 | rfp = ofp; | |
cd6eca43 MW |
514 | } else if ((rfp = tmpfile()) == 0) { |
515 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 516 | die(EXIT_FAILURE, "couldn't create temporary file: %s", strerror(errno)); |
cd6eca43 | 517 | } |
5c3f75ec | 518 | |
519 | seq = 0; | |
520 | dstr_ensure(&d, GC_CLASS(c)->blksz); | |
521 | dstr_ensure(&d, 4); | |
522 | for (;;) { | |
523 | if (GC_CLASS(c)->blksz) { | |
524 | GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); | |
525 | GC_SETIV(c, d.buf); | |
526 | } | |
527 | h = GM_INIT(m); | |
dfd1608a | 528 | GH_HASHU32(h, seq); |
5c3f75ec | 529 | seq++; |
530 | chunk_read(e, &d, &b); | |
cd6eca43 MW |
531 | if (f & f_progress) |
532 | fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); | |
c65df279 | 533 | if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) { |
cd6eca43 | 534 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 535 | if (verb) printf("FAIL bad ciphertext chunk: no tag\n"); |
c65df279 | 536 | exit(EXIT_FAILURE); |
537 | } | |
5c3f75ec | 538 | GH_HASH(h, BCUR(&b), BLEFT(&b)); |
c65df279 | 539 | if (memcmp(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz) != 0) { |
cd6eca43 | 540 | if (f & f_progress) fprogress_done(&ff); |
c65df279 | 541 | if (verb) |
fa54fe1e | 542 | printf("FAIL bad ciphertext chunk: authentication failure\n"); |
c65df279 | 543 | exit(EXIT_FAILURE); |
544 | } | |
ef13e9a4 | 545 | GH_DESTROY(h); |
5c3f75ec | 546 | if (!BLEFT(&b)) |
547 | break; | |
548 | GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); | |
fa54fe1e | 549 | if (fwrite(BCUR(&b), 1, BLEFT(&b), rfp) != BLEFT(&b)) { |
cd6eca43 | 550 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 551 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); |
c65df279 | 552 | exit(EXIT_FAILURE); |
553 | } | |
554 | } | |
555 | ||
cd6eca43 | 556 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 557 | if (fflush(rfp) || ferror(rfp)) { |
558 | if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); | |
c65df279 | 559 | exit(EXIT_FAILURE); |
5c3f75ec | 560 | } |
fa54fe1e | 561 | if (f & f_buffer) { |
562 | if (!ofp && (ofp = fopen(of, "wb")) == 0) { | |
563 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
564 | of, strerror(errno)); | |
565 | } | |
566 | rewind(rfp); | |
cd6eca43 | 567 | if (f & f_progress) fprogress_init(&ff, "copying buffer", rfp); |
fa54fe1e | 568 | dstr_reset(&d); |
569 | dstr_ensure(&d, 65536); | |
64459c98 | 570 | if (verb && ofp == stdout) printf("DATA\n"); |
fa54fe1e | 571 | for (;;) { |
572 | n = fread(d.buf, 1, d.sz, rfp); | |
573 | if (!n) break; | |
cd6eca43 MW |
574 | if (f & f_progress) fprogress_update(&ff, n); |
575 | if (fwrite(d.buf, 1, n, ofp) < n) { | |
576 | if (f & f_progress) fprogress_done(&ff); | |
fa54fe1e | 577 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
cd6eca43 | 578 | } |
fa54fe1e | 579 | } |
cd6eca43 | 580 | if (f & f_progress) fprogress_done(&ff); |
fa54fe1e | 581 | if (ferror(rfp) || fclose(rfp)) |
582 | die(EXIT_FAILURE, "error unbuffering output: %s", strerror(errno)); | |
583 | } | |
5c3f75ec | 584 | |
5c3f75ec | 585 | e->ops->decdone(e); |
c65df279 | 586 | if (verb && ofp != stdout) |
587 | printf("OK decrypted successfully\n"); | |
f0c52873 MW |
588 | if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp))) |
589 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
5c3f75ec | 590 | freeenc(e); |
591 | GC_DESTROY(c); | |
592 | GC_DESTROY(cx); | |
593 | GM_DESTROY(m); | |
594 | freekem(km); | |
ef13e9a4 | 595 | if (fp != stdin) fclose(fp); |
5c3f75ec | 596 | key_close(&kf); |
597 | dstr_destroy(&d); | |
598 | return (0); | |
599 | ||
600 | #undef f_bogus | |
fa54fe1e | 601 | #undef f_buffer |
946c3f72 | 602 | #undef f_nocheck |
cd6eca43 | 603 | #undef f_progress |
5c3f75ec | 604 | } |
605 | ||
606 | /*----- Main code ---------------------------------------------------------*/ | |
607 | ||
c65df279 | 608 | #define LISTS(LI) \ |
609 | LI("Lists", list, \ | |
610 | listtab[i].name, listtab[i].name) \ | |
611 | LI("Key-encapsulation mechanisms", kem, \ | |
612 | kemtab[i].name, kemtab[i].name) \ | |
613 | LI("Signature schemes", sig, \ | |
614 | sigtab[i].name, sigtab[i].name) \ | |
615 | LI("Encodings", enc, \ | |
616 | enctab[i].name, enctab[i].name) \ | |
617 | LI("Symmetric encryption algorithms", cipher, \ | |
618 | gciphertab[i], gciphertab[i]->name) \ | |
619 | LI("Hash functions", hash, \ | |
620 | ghashtab[i], ghashtab[i]->name) \ | |
621 | LI("Message authentication codes", mac, \ | |
622 | gmactab[i], gmactab[i]->name) | |
623 | ||
624 | MAKELISTTAB(listtab, LISTS) | |
625 | ||
626 | int cmd_show(int argc, char *argv[]) | |
627 | { | |
628 | return (displaylists(listtab, argv + 1)); | |
629 | } | |
630 | ||
631 | static int cmd_help(int, char **); | |
5c3f75ec | 632 | |
633 | static cmd cmdtab[] = { | |
c65df279 | 634 | { "help", cmd_help, "help [COMMAND...]" }, |
635 | { "show", cmd_show, "show [ITEM...]" }, | |
fa54fe1e | 636 | CMD_ENCODE, |
637 | CMD_DECODE, | |
5c3f75ec | 638 | { "encrypt", encrypt, |
cd6eca43 | 639 | "encrypt [-apC] [-k TAG] [-s TAG] [-f FORMAT]\n\t\ |
c65df279 | 640 | [-o OUTPUT] [FILE]", "\ |
5c3f75ec | 641 | Options:\n\ |
642 | \n\ | |
643 | -a, --armour Same as `-f pem'.\n\ | |
644 | -f, --format=FORMAT Encode as FORMAT.\n\ | |
c65df279 | 645 | -k, --key=TAG Use public encryption key named by TAG.\n\ |
646 | -s, --sign-key=TAG Use private signature key named by TAG.\n\ | |
5c3f75ec | 647 | -o, --output=FILE Write output to FILE.\n\ |
cd6eca43 | 648 | -p, --progress Show progress on large files.\n\ |
946c3f72 | 649 | -C, --nocheck Don't check the public key.\n\ |
5c3f75ec | 650 | " }, |
651 | { "decrypt", decrypt, | |
cd6eca43 | 652 | "decrypt [-abpqvC] [-f FORMAT] [-o OUTPUT] [FILE]", "\ |
5c3f75ec | 653 | Options:\n\ |
654 | \n\ | |
c65df279 | 655 | -a, --armour Same as `-f pem'.\n\ |
fa54fe1e | 656 | -b, --buffer Buffer output until we're sure we have it all.\n\ |
c65df279 | 657 | -f, --format=FORMAT Decode as FORMAT.\n\ |
5c3f75ec | 658 | -o, --output=FILE Write output to FILE.\n\ |
cd6eca43 | 659 | -p, --progress Show progress on large files.\n\ |
fa54fe1e | 660 | -q, --quiet Produce fewer messages.\n\ |
661 | -v, --verbose Produce more verbose messages.\n\ | |
946c3f72 | 662 | -C, --nocheck Don't check the private key.\n\ |
cd6eca43 | 663 | " }, |
5c3f75ec | 664 | { 0, 0, 0 } |
665 | }; | |
666 | ||
c65df279 | 667 | static int cmd_help(int argc, char **argv) |
5c3f75ec | 668 | { |
c65df279 | 669 | sc_help(cmdtab, stdout, argv + 1); |
670 | return (0); | |
5c3f75ec | 671 | } |
672 | ||
c65df279 | 673 | void version(FILE *fp) |
5c3f75ec | 674 | { |
675 | pquis(fp, "$, Catacomb version " VERSION "\n"); | |
676 | } | |
677 | ||
678 | static void usage(FILE *fp) | |
679 | { | |
c65df279 | 680 | pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n"); |
5c3f75ec | 681 | } |
682 | ||
c65df279 | 683 | void help_global(FILE *fp) |
5c3f75ec | 684 | { |
c65df279 | 685 | usage(fp); |
686 | fputs("\n\ | |
ada55141 | 687 | Encrypt and decrypt files.\n\ |
c65df279 | 688 | \n\ |
689 | Global command-line options:\n\ | |
690 | \n\ | |
691 | -h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\ | |
692 | -v, --version Show program version number.\n\ | |
693 | -u, --usage Show a terse usage message.\n\ | |
694 | \n\ | |
695 | -k, --keyring=FILE Read keys from FILE.\n", | |
696 | fp); | |
5c3f75ec | 697 | } |
698 | ||
699 | /* --- @main@ --- * | |
700 | * | |
701 | * Arguments: @int argc@ = number of command line arguments | |
702 | * @char *argv[]@ = vector of command line arguments | |
703 | * | |
704 | * Returns: Zero if successful, nonzero otherwise. | |
705 | * | |
c65df279 | 706 | * Use: Encrypts or decrypts files. |
5c3f75ec | 707 | */ |
708 | ||
709 | int main(int argc, char *argv[]) | |
710 | { | |
711 | unsigned f = 0; | |
712 | ||
713 | #define f_bogus 1u | |
714 | ||
715 | /* --- Initialize the library --- */ | |
716 | ||
717 | ego(argv[0]); | |
718 | sub_init(); | |
719 | rand_noisesrc(RAND_GLOBAL, &noise_source); | |
720 | rand_seed(RAND_GLOBAL, 160); | |
721 | ||
722 | /* --- Parse options --- */ | |
723 | ||
724 | for (;;) { | |
725 | static struct option opts[] = { | |
726 | { "help", 0, 0, 'h' }, | |
727 | { "version", 0, 0, 'v' }, | |
728 | { "usage", 0, 0, 'u' }, | |
729 | { "keyring", OPTF_ARGREQ, 0, 'k' }, | |
730 | { 0, 0, 0, 0 } | |
731 | }; | |
732 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); | |
733 | if (i < 0) | |
734 | break; | |
735 | switch (i) { | |
736 | case 'h': | |
c65df279 | 737 | sc_help(cmdtab, stdout, argv + optind); |
5c3f75ec | 738 | exit(0); |
739 | break; | |
740 | case 'v': | |
741 | version(stdout); | |
742 | exit(0); | |
743 | break; | |
744 | case 'u': | |
745 | usage(stdout); | |
746 | exit(0); | |
747 | case 'k': | |
748 | keyring = optarg; | |
749 | break; | |
750 | default: | |
751 | f |= f_bogus; | |
752 | break; | |
753 | } | |
754 | } | |
755 | ||
756 | argc -= optind; | |
757 | argv += optind; | |
758 | optind = 0; | |
759 | if (f & f_bogus || argc < 1) { | |
760 | usage(stderr); | |
761 | exit(EXIT_FAILURE); | |
762 | } | |
763 | ||
764 | /* --- Dispatch to the correct subcommand handler --- */ | |
765 | ||
c65df279 | 766 | return (findcmd(cmdtab, argv[0])->cmd(argc, argv)); |
5c3f75ec | 767 | |
768 | #undef f_bogus | |
769 | } | |
770 | ||
771 | /*----- That's all, folks -------------------------------------------------*/ |