| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: catcrypt.c,v 1.2 2004/05/09 13:03:46 mdw Exp $ |
| 4 | * |
| 5 | * Command-line encryption tool |
| 6 | * |
| 7 | * (c) 2004 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Header files ------------------------------------------------------*/ |
| 31 | |
| 32 | #include "config.h" |
| 33 | |
| 34 | #include <errno.h> |
| 35 | #include <stdio.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | |
| 39 | #include <mLib/base64.h> |
| 40 | #include <mLib/dstr.h> |
| 41 | #include <mLib/mdwopt.h> |
| 42 | #include <mLib/quis.h> |
| 43 | #include <mLib/report.h> |
| 44 | #include <mLib/sub.h> |
| 45 | |
| 46 | #include "buf.h" |
| 47 | #include "rand.h" |
| 48 | #include "noise.h" |
| 49 | #include "mprand.h" |
| 50 | #include "key.h" |
| 51 | #include "cc.h" |
| 52 | |
| 53 | /*----- Utilities ---------------------------------------------------------*/ |
| 54 | |
| 55 | /* --- @keyreport@ --- * |
| 56 | * |
| 57 | * Arguments: @const char *file@ = filename containing the error |
| 58 | * @int line@ = line number in file |
| 59 | * @const char *err@ = error text message |
| 60 | * @void *p@ = unimportant pointer |
| 61 | * |
| 62 | * Returns: --- |
| 63 | * |
| 64 | * Use: Reports errors during the opening of a key file. |
| 65 | */ |
| 66 | |
| 67 | static void keyreport(const char *file, int line, const char *err, void *p) |
| 68 | { |
| 69 | moan("error in keyring `%s' at line `%s': %s", file, line, err); |
| 70 | } |
| 71 | |
| 72 | /*----- Static variables --------------------------------------------------*/ |
| 73 | |
| 74 | static const char *keyring = "keyring"; |
| 75 | |
| 76 | /*----- Data format -------------------------------------------------------*/ |
| 77 | |
| 78 | /* --- Overview --- * |
| 79 | * |
| 80 | * The encrypted message is divided into chunks, each preceded by a two-octet |
| 81 | * length. The chunks don't need to be large -- the idea is that we can |
| 82 | * stream the chunks in and out. |
| 83 | * |
| 84 | * The first chunk is a header. It contains the decryption key-id, and maybe |
| 85 | * the verification key-id if the message is signed. |
| 86 | * |
| 87 | * Next comes the key-encapsulation chunk. This is decrypted in some |
| 88 | * KEM-specific way to yield a secret hash. This hash is what is signed if |
| 89 | * the message is signed. The hash is expanded using an MGF (or similar) to |
| 90 | * make a symmetric encryption and MAC key. |
| 91 | * |
| 92 | * If the message is signed, there comes a signature chunk. The signature is |
| 93 | * on the secret hash. This means that the recipient can modify the message |
| 94 | * and still have a valid signature, so it's not useful for proving things to |
| 95 | * other people; but it also means that the recipient knows that the message |
| 96 | * is from someone who knows the hash, which limits the possiblities to (a) |
| 97 | * whoever encrypted the message (good!) and (b) whoever knows the |
| 98 | * recipient's private key. |
| 99 | * |
| 100 | * Then come message chunks. Each one begins with a MAC over an implicit |
| 101 | * sequence number and the ciphertext. The final chunk's ciphertext is |
| 102 | * empty; no other chunk is empty. Thus can the correct end-of-file be |
| 103 | * discerned. |
| 104 | */ |
| 105 | |
| 106 | /*----- Chunk I/O ---------------------------------------------------------*/ |
| 107 | |
| 108 | static void chunk_write(enc *e, buf *b) |
| 109 | { |
| 110 | octet l[2]; |
| 111 | size_t n = BLEN(b); |
| 112 | assert(n <= MASK16); |
| 113 | STORE16(l, n); |
| 114 | if (e->ops->write(e, l, 2) || |
| 115 | e->ops->write(e, BBASE(b), BLEN(b))) |
| 116 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
| 117 | } |
| 118 | |
| 119 | static void chunk_read(enc *e, dstr *d, buf *b) |
| 120 | { |
| 121 | octet l[2]; |
| 122 | size_t n; |
| 123 | |
| 124 | dstr_reset(d); |
| 125 | errno = 0; |
| 126 | if (e->ops->read(e, l, 2) != 2) |
| 127 | goto err; |
| 128 | n = LOAD16(l); |
| 129 | dstr_ensure(d, n); |
| 130 | if (e->ops->read(e, d->buf, n) != n) |
| 131 | goto err; |
| 132 | d->len = n; |
| 133 | buf_init(b, d->buf, d->len); |
| 134 | return; |
| 135 | |
| 136 | err: |
| 137 | if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); |
| 138 | else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
| 139 | } |
| 140 | |
| 141 | /*----- Encryption --------------------------------------------------------*/ |
| 142 | |
| 143 | static int encrypt(int argc, char *argv[]) |
| 144 | { |
| 145 | const char *of = 0, *kn = "ccrypt"; |
| 146 | FILE *ofp = 0; |
| 147 | FILE *fp = 0; |
| 148 | const char *ef = "binary"; |
| 149 | const char *err; |
| 150 | int i; |
| 151 | size_t n; |
| 152 | dstr d = DSTR_INIT; |
| 153 | octet *tag, *ct; |
| 154 | buf b; |
| 155 | size_t seq; |
| 156 | char bb[16384]; |
| 157 | unsigned f = 0; |
| 158 | key_file kf; |
| 159 | key *k; |
| 160 | kem *km; |
| 161 | gcipher *cx, *c; |
| 162 | gmac *m; |
| 163 | ghash *h; |
| 164 | const encops *eo; |
| 165 | enc *e; |
| 166 | |
| 167 | #define f_bogus 1u |
| 168 | |
| 169 | for (;;) { |
| 170 | static const struct option opt[] = { |
| 171 | { "key", OPTF_ARGREQ, 0, 'k' }, |
| 172 | { "armour", 0, 0, 'a' }, |
| 173 | { "armor", 0, 0, 'a' }, |
| 174 | { "format", OPTF_ARGREQ, 0, 'f' }, |
| 175 | { "output", OPTF_ARGREQ, 0, 'o' }, |
| 176 | { 0, 0, 0, 0 } |
| 177 | }; |
| 178 | i = mdwopt(argc, argv, "k:af:o:", opt, 0, 0, 0); |
| 179 | if (i < 0) break; |
| 180 | switch (i) { |
| 181 | case 'k': kn = optarg; break; |
| 182 | case 'a': ef = "pem"; break; |
| 183 | case 'f': ef = optarg; break; |
| 184 | case 'o': of = optarg; break; |
| 185 | default: f |= f_bogus; break; |
| 186 | } |
| 187 | } |
| 188 | if (argc - optind > 1 || (f & f_bogus)) |
| 189 | die(EXIT_FAILURE, "Usage: encrypt [-options] [file]"); |
| 190 | |
| 191 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
| 192 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
| 193 | if ((k = key_bytag(&kf, kn)) == 0) |
| 194 | die(EXIT_FAILURE, "key `%s' not found", kn); |
| 195 | |
| 196 | if ((eo = getenc(ef)) == 0) |
| 197 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
| 198 | |
| 199 | if (optind == argc) |
| 200 | fp = stdin; |
| 201 | else if (strcmp(argv[optind], "-") == 0) { |
| 202 | fp = stdin; |
| 203 | optind++; |
| 204 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { |
| 205 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
| 206 | argv[optind], strerror(errno)); |
| 207 | } else |
| 208 | optind++; |
| 209 | |
| 210 | if (!of || strcmp(of, "-") == 0) |
| 211 | ofp = stdout; |
| 212 | else if ((ofp = fopen(of, eo->wmode)) == 0) { |
| 213 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
| 214 | ofp, strerror(errno)); |
| 215 | } |
| 216 | |
| 217 | key_fulltag(k, &d); |
| 218 | e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE", 1); |
| 219 | km = getkem(k, "ccrypt", 0); |
| 220 | if ((err = km->ops->check(km)) != 0) |
| 221 | moan("key `%s' fails check: %s", d.buf, err); |
| 222 | |
| 223 | /* --- Build the header chunk --- */ |
| 224 | |
| 225 | dstr_reset(&d); |
| 226 | dstr_ensure(&d, 256); |
| 227 | buf_init(&b, d.buf, 256); |
| 228 | buf_putu32(&b, k->id); |
| 229 | assert(BOK(&b)); |
| 230 | chunk_write(e, &b); |
| 231 | |
| 232 | /* --- Build the KEM chunk --- */ |
| 233 | |
| 234 | dstr_reset(&d); |
| 235 | if (setupkem(km, &d, &cx, &c, &m)) |
| 236 | die(EXIT_FAILURE, "failed to encapsulate key"); |
| 237 | buf_init(&b, d.buf, d.len); |
| 238 | BSTEP(&b, d.len); |
| 239 | chunk_write(e, &b); |
| 240 | |
| 241 | /* --- Now do the main crypto --- */ |
| 242 | |
| 243 | assert(GC_CLASS(c)->blksz <= sizeof(bb)); |
| 244 | dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); |
| 245 | seq = 0; |
| 246 | for (;;) { |
| 247 | h = GM_INIT(m); |
| 248 | STORE32(bb, seq); |
| 249 | GH_HASH(h, bb, 4); |
| 250 | seq++; |
| 251 | if (GC_CLASS(c)->blksz) { |
| 252 | GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); |
| 253 | GC_SETIV(c, bb); |
| 254 | } |
| 255 | n = fread(bb, 1, sizeof(bb), fp); |
| 256 | if (!n) break; |
| 257 | buf_init(&b, d.buf, d.sz); |
| 258 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
| 259 | ct = buf_get(&b, n); |
| 260 | assert(tag); assert(ct); |
| 261 | GC_ENCRYPT(c, bb, ct, n); |
| 262 | GH_HASH(h, ct, n); |
| 263 | GH_DONE(h, tag); |
| 264 | GH_DESTROY(h); |
| 265 | chunk_write(e, &b); |
| 266 | } |
| 267 | |
| 268 | /* --- Final terminator packet --- */ |
| 269 | |
| 270 | buf_init(&b, d.buf, d.sz); |
| 271 | tag = buf_get(&b, GM_CLASS(m)->hashsz); |
| 272 | assert(tag); |
| 273 | GH_DONE(h, tag); |
| 274 | GH_DESTROY(h); |
| 275 | chunk_write(e, &b); |
| 276 | |
| 277 | /* --- All done --- */ |
| 278 | |
| 279 | e->ops->encdone(e); |
| 280 | GM_DESTROY(m); |
| 281 | GC_DESTROY(c); |
| 282 | GC_DESTROY(cx); |
| 283 | freeenc(e); |
| 284 | freekem(km); |
| 285 | if (of) fclose(ofp); |
| 286 | key_close(&kf); |
| 287 | dstr_destroy(&d); |
| 288 | return (0); |
| 289 | |
| 290 | #undef f_bogus |
| 291 | } |
| 292 | |
| 293 | /*---- Decryption ---------------------------------------------------------*/ |
| 294 | |
| 295 | static int decrypt(int argc, char *argv[]) |
| 296 | { |
| 297 | const char *of = 0; |
| 298 | FILE *ofp = 0; |
| 299 | FILE *fp = 0; |
| 300 | const char *ef = "binary"; |
| 301 | int i; |
| 302 | dstr d = DSTR_INIT; |
| 303 | buf b; |
| 304 | key_file kf; |
| 305 | size_t seq; |
| 306 | uint32 id; |
| 307 | key *k; |
| 308 | kem *km; |
| 309 | gcipher *cx; |
| 310 | gcipher *c; |
| 311 | ghash *h; |
| 312 | gmac *m; |
| 313 | octet *tag; |
| 314 | unsigned f = 0; |
| 315 | const encops *eo; |
| 316 | enc *e; |
| 317 | |
| 318 | #define f_bogus 1u |
| 319 | |
| 320 | for (;;) { |
| 321 | static const struct option opt[] = { |
| 322 | { "armour", 0, 0, 'a' }, |
| 323 | { "armor", 0, 0, 'a' }, |
| 324 | { "format", OPTF_ARGREQ, 0, 'f' }, |
| 325 | { "output", OPTF_ARGREQ, 0, 'o' }, |
| 326 | { 0, 0, 0, 0 } |
| 327 | }; |
| 328 | i = mdwopt(argc, argv, "af:o:", opt, 0, 0, 0); |
| 329 | if (i < 0) break; |
| 330 | switch (i) { |
| 331 | case 'a': ef = "pem"; break; |
| 332 | case 'f': ef = optarg; break; |
| 333 | case 'o': of = optarg; break; |
| 334 | default: f |= f_bogus; break; |
| 335 | } |
| 336 | } |
| 337 | if (argc - optind > 1 || (f & f_bogus)) |
| 338 | die(EXIT_FAILURE, "Usage: decrypt [-options] [file]"); |
| 339 | |
| 340 | if ((eo = getenc(ef)) == 0) |
| 341 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
| 342 | |
| 343 | if (optind == argc) |
| 344 | fp = stdin; |
| 345 | else if (strcmp(argv[optind], "-") == 0) { |
| 346 | fp = stdin; |
| 347 | optind++; |
| 348 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { |
| 349 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
| 350 | argv[optind], strerror(errno)); |
| 351 | } else |
| 352 | optind++; |
| 353 | |
| 354 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
| 355 | die(EXIT_FAILURE, "can't open keyring `%s'", keyring); |
| 356 | |
| 357 | e = initenc(eo, fp, "CATCRYPT ENCRYPTED MESSAGE", 0); |
| 358 | |
| 359 | /* --- Read the header chunk --- */ |
| 360 | |
| 361 | chunk_read(e, &d, &b); |
| 362 | if (buf_getu32(&b, &id)) |
| 363 | die(EXIT_FAILURE, "malformed header: missing keyid"); |
| 364 | if (BLEFT(&b)) |
| 365 | die(EXIT_FAILURE, "malformed header: junk at end"); |
| 366 | |
| 367 | /* --- Find the key --- */ |
| 368 | |
| 369 | if ((k = key_byid(&kf, id)) == 0) |
| 370 | die(EXIT_FAILURE, "key id %08lx not found", (unsigned long)id); |
| 371 | km = getkem(k, "ccrypt", 1); |
| 372 | |
| 373 | /* --- Read the KEM chunk --- */ |
| 374 | |
| 375 | chunk_read(e, &d, &b); |
| 376 | if (setupkem(km, &d, &cx, &c, &m)) |
| 377 | die(EXIT_FAILURE, "failed to decapsulate key"); |
| 378 | |
| 379 | /* --- Now decrypt the main body --- */ |
| 380 | |
| 381 | if (!of || strcmp(of, "-") == 0) |
| 382 | ofp = stdout; |
| 383 | else if ((ofp = fopen(of, "wb")) == 0) { |
| 384 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
| 385 | ofp, strerror(errno)); |
| 386 | } |
| 387 | |
| 388 | seq = 0; |
| 389 | dstr_ensure(&d, GC_CLASS(c)->blksz); |
| 390 | dstr_ensure(&d, 4); |
| 391 | for (;;) { |
| 392 | if (GC_CLASS(c)->blksz) { |
| 393 | GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); |
| 394 | GC_SETIV(c, d.buf); |
| 395 | } |
| 396 | h = GM_INIT(m); |
| 397 | STORE32(d.buf, seq); |
| 398 | GH_HASH(h, d.buf, 4); |
| 399 | seq++; |
| 400 | chunk_read(e, &d, &b); |
| 401 | if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) |
| 402 | die(EXIT_FAILURE, "bad ciphertext chunk: no tag"); |
| 403 | GH_HASH(h, BCUR(&b), BLEFT(&b)); |
| 404 | if (memcmp(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz) != 0) |
| 405 | die(EXIT_FAILURE, "bad ciphertext chunk: authentication failure"); |
| 406 | if (!BLEFT(&b)) |
| 407 | break; |
| 408 | GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); |
| 409 | if (fwrite(BCUR(&b), 1, BLEFT(&b), ofp) != BLEFT(&b)) |
| 410 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
| 411 | } |
| 412 | |
| 413 | if (fflush(ofp) || ferror(ofp)) |
| 414 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
| 415 | |
| 416 | e->ops->decdone(e); |
| 417 | freeenc(e); |
| 418 | GC_DESTROY(c); |
| 419 | GC_DESTROY(cx); |
| 420 | GM_DESTROY(m); |
| 421 | freekem(km); |
| 422 | if (of) fclose(ofp); |
| 423 | key_close(&kf); |
| 424 | dstr_destroy(&d); |
| 425 | return (0); |
| 426 | |
| 427 | #undef f_bogus |
| 428 | } |
| 429 | |
| 430 | /*----- Test code ---------------------------------------------------------*/ |
| 431 | |
| 432 | static int encode(int argc, char *argv[]) |
| 433 | { |
| 434 | const char *of = 0; |
| 435 | FILE *ofp = 0; |
| 436 | FILE *fp = 0; |
| 437 | const char *ef = "binary"; |
| 438 | const char *bd = "MESSAGE"; |
| 439 | int i; |
| 440 | size_t n; |
| 441 | char buf[4096]; |
| 442 | unsigned f = 0; |
| 443 | const encops *eo; |
| 444 | enc *e; |
| 445 | |
| 446 | #define f_bogus 1u |
| 447 | |
| 448 | for (;;) { |
| 449 | static const struct option opt[] = { |
| 450 | { "format", OPTF_ARGREQ, 0, 'f' }, |
| 451 | { "boundary", OPTF_ARGREQ, 0, 'b' }, |
| 452 | { "output", OPTF_ARGREQ, 0, 'o' }, |
| 453 | { 0, 0, 0, 0 } |
| 454 | }; |
| 455 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); |
| 456 | if (i < 0) break; |
| 457 | switch (i) { |
| 458 | case 'f': ef = optarg; break; |
| 459 | case 'b': bd = optarg; break; |
| 460 | case 'o': of = optarg; break; |
| 461 | default: f |= f_bogus; break; |
| 462 | } |
| 463 | } |
| 464 | if (argc - optind > 1 || (f & f_bogus)) |
| 465 | die(EXIT_FAILURE, "Usage: encode [-options] [file]"); |
| 466 | |
| 467 | if ((eo = getenc(ef)) == 0) |
| 468 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
| 469 | |
| 470 | if (optind == argc) |
| 471 | fp = stdin; |
| 472 | else if (strcmp(argv[optind], "-") == 0) { |
| 473 | fp = stdin; |
| 474 | optind++; |
| 475 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { |
| 476 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
| 477 | argv[optind], strerror(errno)); |
| 478 | } else |
| 479 | optind++; |
| 480 | |
| 481 | if (!of || strcmp(of, "-") == 0) |
| 482 | ofp = stdout; |
| 483 | else if ((ofp = fopen(of, eo->wmode)) == 0) { |
| 484 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
| 485 | ofp, strerror(errno)); |
| 486 | } |
| 487 | |
| 488 | e = initenc(eo, ofp, bd, 1); |
| 489 | |
| 490 | do { |
| 491 | n = fread(buf, 1, sizeof(buf), fp); |
| 492 | if (e->ops->write(e, buf, n)) |
| 493 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
| 494 | } while (n == sizeof(buf)); |
| 495 | e->ops->encdone(e); |
| 496 | freeenc(e); |
| 497 | return (0); |
| 498 | |
| 499 | #undef f_bogus |
| 500 | } |
| 501 | |
| 502 | static int decode(int argc, char *argv[]) |
| 503 | { |
| 504 | const char *of = 0; |
| 505 | FILE *ofp = 0; |
| 506 | FILE *fp = 0; |
| 507 | const char *ef = "binary"; |
| 508 | const char *bd = 0; |
| 509 | int i; |
| 510 | char buf[4096]; |
| 511 | unsigned f = 0; |
| 512 | const encops *eo; |
| 513 | enc *e; |
| 514 | |
| 515 | #define f_bogus 1u |
| 516 | |
| 517 | for (;;) { |
| 518 | static const struct option opt[] = { |
| 519 | { "format", OPTF_ARGREQ, 0, 'f' }, |
| 520 | { "boundary", OPTF_ARGREQ, 0, 'b' }, |
| 521 | { "output", OPTF_ARGREQ, 0, 'o' }, |
| 522 | { 0, 0, 0, 0 } |
| 523 | }; |
| 524 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); |
| 525 | if (i < 0) break; |
| 526 | switch (i) { |
| 527 | case 'f': ef = optarg; break; |
| 528 | case 'b': bd = optarg; break; |
| 529 | case 'o': of = optarg; break; |
| 530 | default: f |= f_bogus; break; |
| 531 | } |
| 532 | } |
| 533 | if (argc - optind > 1 || (f & f_bogus)) |
| 534 | die(EXIT_FAILURE, "Usage: decode [-options] [file]"); |
| 535 | |
| 536 | if ((eo = getenc(ef)) == 0) |
| 537 | die(EXIT_FAILURE, "encoding `%s' not found", ef); |
| 538 | |
| 539 | if (optind == argc) |
| 540 | fp = stdin; |
| 541 | else if (strcmp(argv[optind], "-") == 0) { |
| 542 | fp = stdin; |
| 543 | optind++; |
| 544 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { |
| 545 | die(EXIT_FAILURE, "couldn't open file `%s': %s", |
| 546 | argv[optind], strerror(errno)); |
| 547 | } else |
| 548 | optind++; |
| 549 | |
| 550 | if (!of || strcmp(of, "-") == 0) |
| 551 | ofp = stdout; |
| 552 | else if ((ofp = fopen(of, "wb")) == 0) { |
| 553 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", |
| 554 | ofp, strerror(errno)); |
| 555 | } |
| 556 | |
| 557 | e = initenc(eo, fp, bd, 0); |
| 558 | |
| 559 | do { |
| 560 | if ((i = e->ops->read(e, buf, sizeof(buf))) < 0) |
| 561 | die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); |
| 562 | if (fwrite(buf, 1, i, ofp) < i) |
| 563 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); |
| 564 | } while (i == sizeof(buf)); |
| 565 | e->ops->decdone(e); |
| 566 | freeenc(e); |
| 567 | return (0); |
| 568 | |
| 569 | #undef f_bogus |
| 570 | } |
| 571 | |
| 572 | /*----- Main code ---------------------------------------------------------*/ |
| 573 | |
| 574 | typedef struct cmd { |
| 575 | const char *name; |
| 576 | int (*func)(int /*argc*/, char */*argv*/[]); |
| 577 | const char *usage; |
| 578 | const char *help; |
| 579 | } cmd; |
| 580 | |
| 581 | static cmd cmdtab[] = { |
| 582 | { "encode", encode, |
| 583 | "encode [-f format] [-b label] [-o output] [file]", |
| 584 | "\ |
| 585 | Options:\n\ |
| 586 | \n\ |
| 587 | -f, --format=FORMAT Encode to FORMAT.\n\ |
| 588 | -b, --boundary=LABEL PEM boundary is LABEL.\n\ |
| 589 | -o, --output=FILE Write output to FILE.\n\ |
| 590 | " }, |
| 591 | { "decode", decode, |
| 592 | "decode [-f format] [-b label] [-o output] [file]", |
| 593 | "\ |
| 594 | Options:\n\ |
| 595 | \n\ |
| 596 | -f, --format=FORMAT Decode from FORMAT.\n\ |
| 597 | -b, --boundary=LABEL PEM boundary is LABEL.\n\ |
| 598 | -o, --output=FILE Write output to FILE.\n\ |
| 599 | " }, |
| 600 | { "encrypt", encrypt, |
| 601 | "encrypt [-a] [-k tag] [f format]] [-o output] [file]", |
| 602 | "\ |
| 603 | Options:\n\ |
| 604 | \n\ |
| 605 | -a, --armour Same as `-f pem'.\n\ |
| 606 | -f, --format=FORMAT Encode as FORMAT.\n\ |
| 607 | -k, --key=TAG Use public key named by TAG.\n\ |
| 608 | -o, --output=FILE Write output to FILE.\n\ |
| 609 | " }, |
| 610 | { "decrypt", decrypt, |
| 611 | "decrypt [-t] [-o output] [file]", "\ |
| 612 | Options:\n\ |
| 613 | \n\ |
| 614 | -t, --text Read PEM-encoded input.\n\ |
| 615 | -o, --output=FILE Write output to FILE.\n\ |
| 616 | " }, |
| 617 | { 0, 0, 0 } |
| 618 | }; |
| 619 | |
| 620 | /* --- @findcmd@ --- * |
| 621 | * |
| 622 | * Arguments: @const char *name@ = a command name |
| 623 | * |
| 624 | * Returns: Pointer to the command structure. |
| 625 | * |
| 626 | * Use: Looks up a command by name. If the command isn't found, an |
| 627 | * error is reported and the program is terminated. |
| 628 | */ |
| 629 | |
| 630 | static cmd *findcmd(const char *name) |
| 631 | { |
| 632 | cmd *c, *chosen = 0; |
| 633 | size_t sz = strlen(name); |
| 634 | |
| 635 | for (c = cmdtab; c->name; c++) { |
| 636 | if (strncmp(name, c->name, sz) == 0) { |
| 637 | if (c->name[sz] == 0) { |
| 638 | chosen = c; |
| 639 | break; |
| 640 | } else if (chosen) |
| 641 | die(EXIT_FAILURE, "ambiguous command name `%s'", name); |
| 642 | else |
| 643 | chosen = c; |
| 644 | } |
| 645 | } |
| 646 | if (!chosen) |
| 647 | die(EXIT_FAILURE, "unknown command name `%s'", name); |
| 648 | return (chosen); |
| 649 | } |
| 650 | |
| 651 | static void version(FILE *fp) |
| 652 | { |
| 653 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
| 654 | } |
| 655 | |
| 656 | static void usage(FILE *fp) |
| 657 | { |
| 658 | pquis(fp, "Usage: $ [-k keyring] command [args]\n"); |
| 659 | } |
| 660 | |
| 661 | static void help(FILE *fp, char **argv) |
| 662 | { |
| 663 | cmd *c; |
| 664 | |
| 665 | if (*argv) { |
| 666 | c = findcmd(*argv); |
| 667 | fprintf(fp, "Usage: %s [-k keyring] %s\n", QUIS, c->usage); |
| 668 | if (c->help) { |
| 669 | fputc('\n', fp); |
| 670 | fputs(c->help, fp); |
| 671 | } |
| 672 | } else { |
| 673 | version(fp); |
| 674 | fputc('\n', fp); |
| 675 | usage(fp); |
| 676 | fputs("\n\ |
| 677 | Encrypt and decrypt files.\n\ |
| 678 | \n", fp); |
| 679 | for (c = cmdtab; c->name; c++) |
| 680 | fprintf(fp, "%s\n", c->usage); |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | /* --- @main@ --- * |
| 685 | * |
| 686 | * Arguments: @int argc@ = number of command line arguments |
| 687 | * @char *argv[]@ = vector of command line arguments |
| 688 | * |
| 689 | * Returns: Zero if successful, nonzero otherwise. |
| 690 | * |
| 691 | * Use: Signs or verifies signatures on lists of files. Useful for |
| 692 | * ensuring that a distribution is unmolested. |
| 693 | */ |
| 694 | |
| 695 | int main(int argc, char *argv[]) |
| 696 | { |
| 697 | unsigned f = 0; |
| 698 | |
| 699 | #define f_bogus 1u |
| 700 | |
| 701 | /* --- Initialize the library --- */ |
| 702 | |
| 703 | ego(argv[0]); |
| 704 | sub_init(); |
| 705 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 706 | rand_seed(RAND_GLOBAL, 160); |
| 707 | |
| 708 | /* --- Parse options --- */ |
| 709 | |
| 710 | for (;;) { |
| 711 | static struct option opts[] = { |
| 712 | { "help", 0, 0, 'h' }, |
| 713 | { "version", 0, 0, 'v' }, |
| 714 | { "usage", 0, 0, 'u' }, |
| 715 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
| 716 | { 0, 0, 0, 0 } |
| 717 | }; |
| 718 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
| 719 | if (i < 0) |
| 720 | break; |
| 721 | switch (i) { |
| 722 | case 'h': |
| 723 | help(stdout, argv + optind); |
| 724 | exit(0); |
| 725 | break; |
| 726 | case 'v': |
| 727 | version(stdout); |
| 728 | exit(0); |
| 729 | break; |
| 730 | case 'u': |
| 731 | usage(stdout); |
| 732 | exit(0); |
| 733 | case 'k': |
| 734 | keyring = optarg; |
| 735 | break; |
| 736 | default: |
| 737 | f |= f_bogus; |
| 738 | break; |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | argc -= optind; |
| 743 | argv += optind; |
| 744 | optind = 0; |
| 745 | if (f & f_bogus || argc < 1) { |
| 746 | usage(stderr); |
| 747 | exit(EXIT_FAILURE); |
| 748 | } |
| 749 | |
| 750 | /* --- Dispatch to the correct subcommand handler --- */ |
| 751 | |
| 752 | return (findcmd(argv[0])->func(argc, argv)); |
| 753 | |
| 754 | #undef f_bogus |
| 755 | } |
| 756 | |
| 757 | /*----- That's all, folks -------------------------------------------------*/ |