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