X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/progs/catcrypt.c diff --git a/progs/catcrypt.c b/progs/catcrypt.c new file mode 100644 index 0000000..6e0db1d --- /dev/null +++ b/progs/catcrypt.c @@ -0,0 +1,769 @@ +/* -*-c-*- + * + * Command-line encryption tool + * + * (c) 2004 Straylight/Edgeware + */ + +/*----- Licensing notice --------------------------------------------------* + * + * This file is part of Catacomb. + * + * Catacomb is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * Catacomb is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with Catacomb; if not, write to the Free + * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + * MA 02111-1307, USA. + */ + +/*----- Header files ------------------------------------------------------*/ + +#define _FILE_OFFSET_BITS 64 + +#include "config.h" + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "buf.h" +#include "rand.h" +#include "noise.h" +#include "mprand.h" +#include "key.h" +#include "cc.h" + +#include "ectab.h" +#include "ptab.h" + +/*----- Static variables --------------------------------------------------*/ + +static const char *keyring = "keyring"; + +/*----- Data format -------------------------------------------------------*/ + +/* --- Overview --- * + * + * The encrypted message is divided into chunks, each preceded by a two-octet + * length. The chunks don't need to be large -- the idea is that we can + * stream the chunks in and out. + * + * The first chunk is a header. It contains the decryption key-id, and maybe + * the verification key-id if the message is signed. + * + * Next comes the key-encapsulation chunk. This is decrypted in some + * KEM-specific way to yield a secret hash. The hash is expanded using an + * MGF (or similar) to make a symmetric encryption and MAC key. + * + * If the message is signed, there comes a signature chunk. The signature is + * on the header and key-encapsulation chunks, and further output of the MGF. + * This means that the recipient can modify the message and still have a + * valid signature, so it's not useful for proving things to other people; + * but it also means that the recipient knows that the message is from + * someone who knows the hash, which limits the possiblities to (a) whoever + * encrypted the message (good!) and (b) whoever knows the recipient's + * private key. + * + * Then come message chunks. Each one begins with a MAC over an implicit + * sequence number and the ciphertext. The final chunk's ciphertext is + * empty; no other chunk is empty. Thus can the correct end-of-file be + * discerned. + */ + +/*----- Chunk I/O ---------------------------------------------------------*/ + +static void chunk_write(enc *e, buf *b) +{ + octet l[2]; + size_t n = BLEN(b); + assert(n <= MASK16); + STORE16(l, n); + if (e->ops->write(e, l, 2) || + e->ops->write(e, BBASE(b), BLEN(b))) + die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); +} + +static void chunk_read(enc *e, dstr *d, buf *b) +{ + octet l[2]; + size_t n; + + dstr_reset(d); + errno = 0; + if (e->ops->read(e, l, 2) != 2) + goto err; + n = LOAD16(l); + dstr_ensure(d, n); + if (e->ops->read(e, d->buf, n) != n) + goto err; + d->len = n; + buf_init(b, d->buf, d->len); + return; + +err: + if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input"); + else die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); +} + +/*----- Encryption --------------------------------------------------------*/ + +static int encrypt(int argc, char *argv[]) +{ + const char *fn, *of = 0, *kn = "ccrypt", *skn = 0; + FILE *ofp = 0; + FILE *fp = 0; + const char *ef = "binary"; + fprogress ff; + const char *err; + int i; + int en; + size_t n, chsz; + dstr d = DSTR_INIT; + octet *tag, *ct; + buf b; + size_t seq; + char bb[65536]; + unsigned f = 0; + key_file kf; + key *k; + key *sk = 0; + kem *km; + sig *s = 0; + gcipher *cx, *c; + gmac *m; + ghash *h; + const encops *eo; + enc *e; + +#define f_bogus 1u +#define f_nocheck 2u +#define f_progress 4u + + for (;;) { + static const struct option opt[] = { + { "key", OPTF_ARGREQ, 0, 'k' }, + { "sign-key", OPTF_ARGREQ, 0, 's' }, + { "armour", 0, 0, 'a' }, + { "armor", 0, 0, 'a' }, + { "format", OPTF_ARGREQ, 0, 'f' }, + { "output", OPTF_ARGREQ, 0, 'o' }, + { "progress", 0, 0, 'p' }, + { "nocheck", 0, 0, 'C' }, + { 0, 0, 0, 0 } + }; + i = mdwopt(argc, argv, "k:s:af:o:pC", opt, 0, 0, 0); + if (i < 0) break; + switch (i) { + case 'k': kn = optarg; break; + case 's': skn = optarg; break; + case 'a': ef = "pem"; break; + case 'f': ef = optarg; break; + case 'o': of = optarg; break; + case 'p': f |= f_progress; break; + case 'C': f |= f_nocheck; break; + default: f |= f_bogus; break; + } + } + if (argc - optind > 1 || (f & f_bogus)) + die(EXIT_FAILURE, "Usage: encrypt [-OPTIONS] [FILE]"); + + if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) + die(EXIT_FAILURE, "can't open keyring `%s'", keyring); + if ((k = key_bytag(&kf, kn)) == 0) + die(EXIT_FAILURE, "key `%s' not found", kn); + if (skn && (sk = key_bytag(&kf, skn)) == 0) + die(EXIT_FAILURE, "key `%s' not found", skn); + + if ((eo = getenc(ef)) == 0) + die(EXIT_FAILURE, "encoding `%s' not found", ef); + + fn = optind < argc ? argv[optind++] : "-"; + if (strcmp(fn, "-") == 0) + fp = stdin; + else if ((fp = fopen(fn, "rb")) == 0) { + die(EXIT_FAILURE, "couldn't open file `%s': %s", + fn, strerror(errno)); + } + + if (!of || strcmp(of, "-") == 0) + ofp = stdout; + else if ((ofp = fopen(of, eo->wmode)) == 0) { + die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", + ofp, strerror(errno)); + } + + dstr_reset(&d); + key_fulltag(k, &d); + e = initenc(eo, ofp, "CATCRYPT ENCRYPTED MESSAGE"); + km = getkem(k, "cckem", 0); + if (!(f & f_nocheck) && (err = km->ops->check(km)) != 0) + moan("key %s fails check: %s", d.buf, err); + if (sk) { + dstr_reset(&d); + key_fulltag(sk, &d); + s = getsig(sk, "ccsig", 1); + if ((err = s->ops->check(s)) != 0) + moan("key %s fails check: %s", d.buf, err); + } + + /* --- Build the header chunk --- */ + + dstr_reset(&d); + dstr_ensure(&d, 256); + buf_init(&b, d.buf, 256); + buf_putu32(&b, k->id); + if (sk) buf_putu32(&b, sk->id); + assert(BOK(&b)); + if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); + chunk_write(e, &b); + + /* --- Build the KEM chunk --- */ + + dstr_reset(&d); + if (setupkem(km, &d, &cx, &c, &m)) + die(EXIT_FAILURE, "failed to encapsulate key"); + buf_init(&b, d.buf, d.len); + BSTEP(&b, d.len); + if (s) GH_HASHBUF16(s->h, BBASE(&b), BLEN(&b)); + chunk_write(e, &b); + + /* --- Write the signature chunk --- */ + + if (s) { + GC_ENCRYPT(cx, 0, bb, 1024); + GH_HASH(s->h, bb, 1024); + dstr_reset(&d); + if ((en = s->ops->doit(s, &d)) != 0) + die(EXIT_FAILURE, "error creating signature: %s", key_strerror(en)); + buf_init(&b, d.buf, d.len); + BSTEP(&b, d.len); + chunk_write(e, &b); + } + + /* --- Now do the main crypto --- */ + + if (f & f_progress) { + if (fprogress_init(&ff, fn, fp)) { + die(EXIT_FAILURE, "failed to initialize progress display: %s", + strerror(errno)); + } + } + + assert(GC_CLASS(c)->blksz <= sizeof(bb)); + dstr_ensure(&d, sizeof(bb) + GM_CLASS(m)->hashsz); + seq = 0; + chsz = MASK16 - GM_CLASS(m)->hashsz; + for (;;) { + h = GM_INIT(m); + GH_HASHU32(h, seq); + seq++; + if (GC_CLASS(c)->blksz) { + GC_ENCRYPT(cx, 0, bb, GC_CLASS(c)->blksz); + GC_SETIV(c, bb); + } + n = fread(bb, 1, chsz, fp); + if (!n) break; + if (f & f_progress) fprogress_update(&ff, n); + buf_init(&b, d.buf, d.sz); + tag = buf_get(&b, GM_CLASS(m)->hashsz); + ct = buf_get(&b, n); + assert(tag); assert(ct); + GC_ENCRYPT(c, bb, ct, n); + GH_HASH(h, ct, n); + GH_DONE(h, tag); + GH_DESTROY(h); + chunk_write(e, &b); + } + + /* --- Final terminator packet --- */ + + buf_init(&b, d.buf, d.sz); + tag = buf_get(&b, GM_CLASS(m)->hashsz); + assert(tag); + GH_DONE(h, tag); + GH_DESTROY(h); + chunk_write(e, &b); + + /* --- All done --- */ + + if (f & f_progress) fprogress_done(&ff); + e->ops->encdone(e); + GM_DESTROY(m); + GC_DESTROY(c); + GC_DESTROY(cx); + freeenc(e); + if (s) freesig(s); + freekem(km); + if (fp != stdin) fclose(fp); + if (of) fclose(ofp); + key_close(&kf); + dstr_destroy(&d); + return (0); + +#undef f_bogus +#undef f_nocheck +#undef f_progress +} + +/*---- Decryption ---------------------------------------------------------*/ + +static int decrypt(int argc, char *argv[]) +{ + const char *fn, *of = 0; + FILE *ofp = 0, *rfp = 0; + FILE *fp = 0; + const char *ef = "binary"; + fprogress ff; + int i; + size_t n; + dstr d = DSTR_INIT; + buf b; + key_file kf; + size_t seq; + uint32 id; + key *k; + key *sk = 0; + kem *km; + sig *s = 0; + gcipher *cx; + gcipher *c; + ghash *h; + gmac *m; + octet *tag; + unsigned f = 0; + const encops *eo; + const char *err; + int verb = 1; + enc *e; + +#define f_bogus 1u +#define f_buffer 2u +#define f_nocheck 4u +#define f_progress 8u + + for (;;) { + static const struct option opt[] = { + { "armour", 0, 0, 'a' }, + { "armor", 0, 0, 'a' }, + { "buffer", 0, 0, 'b' }, + { "verbose", 0, 0, 'v' }, + { "quiet", 0, 0, 'q' }, + { "nocheck", 0, 0, 'C' }, + { "format", OPTF_ARGREQ, 0, 'f' }, + { "output", OPTF_ARGREQ, 0, 'o' }, + { "progress", 0, 0, 'p' }, + { 0, 0, 0, 0 } + }; + i = mdwopt(argc, argv, "abf:o:pqvC", opt, 0, 0, 0); + if (i < 0) break; + switch (i) { + case 'a': ef = "pem"; break; + case 'b': f |= f_buffer; break; + case 'v': verb++; break; + case 'q': if (verb) verb--; break; + case 'C': f |= f_nocheck; break; + case 'f': ef = optarg; break; + case 'o': of = optarg; break; + case 'p': f |= f_progress; break; + default: f |= f_bogus; break; + } + } + if (argc - optind > 1 || (f & f_bogus)) + die(EXIT_FAILURE, "Usage: decrypt [-OPTIONS] [FILE]"); + + if ((eo = getenc(ef)) == 0) + die(EXIT_FAILURE, "encoding `%s' not found", ef); + + fn = optind < argc ? argv[optind++] : "-"; + if (strcmp(fn, "-") == 0) + fp = stdin; + else if ((fp = fopen(fn, eo->rmode)) == 0) { + die(EXIT_FAILURE, "couldn't open file `%s': %s", + fn, strerror(errno)); + } + + if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) + die(EXIT_FAILURE, "can't open keyring `%s'", keyring); + + e = initdec(eo, fp, checkbdry, "CATCRYPT ENCRYPTED MESSAGE"); + + if (f & f_progress) { + if (fprogress_init(&ff, fn, fp)) { + die(EXIT_FAILURE, "failed to initialize progress display: %s", + strerror(errno)); + } + } + + /* --- Read the header chunk --- */ + + chunk_read(e, &d, &b); + if (f & f_progress) + fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); + if (buf_getu32(&b, &id)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL malformed header: missing keyid\n"); + exit(EXIT_FAILURE); + } + if ((k = key_byid(&kf, id)) == 0) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); + exit(EXIT_FAILURE); + } + if (BLEFT(&b)) { + if (buf_getu32(&b, &id)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL malformed header: missing signature keyid\n"); + exit(EXIT_FAILURE); + } + if ((sk = key_byid(&kf, id)) == 0) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL key id %08lx not found\n", (unsigned long)id); + exit(EXIT_FAILURE); + } + } + if (BLEFT(&b)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL malformed header: junk at end\n"); + exit(EXIT_FAILURE); + } + if (sk) { + s = getsig(sk, "ccsig", 0); + if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0) { + dstr_reset(&d); + key_fulltag(sk, &d); + printf("WARN verification key %s fails check: %s\n", d.buf, err); + } + GH_HASHBUF16(s->h, BBASE(&b), BSZ(&b)); + } + + /* --- Find the key --- */ + + km = getkem(k, "cckem", 1); + + /* --- Read the KEM chunk --- */ + + chunk_read(e, &d, &b); + if (f & f_progress) + fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); + if (setupkem(km, &d, &cx, &c, &m)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL failed to decapsulate key\n"); + exit(EXIT_FAILURE); + } + if (s) GH_HASHBUF16(s->h, d.buf, d.len); + + /* --- Verify the signature, if there is one --- */ + + if (sk) { + dstr_reset(&d); + dstr_ensure(&d, 1024); + GC_ENCRYPT(cx, 0, d.buf, 1024); + GH_HASH(s->h, d.buf, 1024); + chunk_read(e, &d, &b); + if (f & f_progress) + fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); + if (s->ops->doit(s, &d)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL signature verification failed\n"); + exit(EXIT_FAILURE); + } + if (verb) { + dstr_reset(&d); + key_fulltag(sk, &d); + if (f & f_progress) fprogress_clear(&ff); + printf("INFO good-signature %s\n", d.buf); + } + freesig(s); + } else if (verb) { + if (f & f_progress) fprogress_clear(&ff); + printf("INFO no-signature\n"); + } + + /* --- Now decrypt the main body --- */ + + if (!of || strcmp(of, "-") == 0) { + ofp = stdout; + f |= f_buffer; + } + if (!(f & f_buffer)) { + if ((ofp = fopen(of, "wb")) == 0) { + if (f & f_progress) fprogress_done(&ff); + die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", + ofp, strerror(errno)); + } + rfp = ofp; + } else if ((rfp = tmpfile()) == 0) { + if (f & f_progress) fprogress_done(&ff); + die(EXIT_FAILURE, "couldn't create temporary file: %s", strerror(errno)); + } + + seq = 0; + dstr_ensure(&d, GC_CLASS(c)->blksz); + dstr_ensure(&d, 4); + for (;;) { + if (GC_CLASS(c)->blksz) { + GC_ENCRYPT(cx, 0, d.buf, GC_CLASS(c)->blksz); + GC_SETIV(c, d.buf); + } + h = GM_INIT(m); + GH_HASHU32(h, seq); + seq++; + chunk_read(e, &d, &b); + if (f & f_progress) + fprogress_update(&ff, BLEFT(&b)*e->ops->ncook/e->ops->nraw); + if ((tag = buf_get(&b, GM_CLASS(m)->hashsz)) == 0) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL bad ciphertext chunk: no tag\n"); + exit(EXIT_FAILURE); + } + GH_HASH(h, BCUR(&b), BLEFT(&b)); + if (memcmp(tag, GH_DONE(h, 0), GM_CLASS(m)->hashsz) != 0) { + if (f & f_progress) fprogress_done(&ff); + if (verb) + printf("FAIL bad ciphertext chunk: authentication failure\n"); + exit(EXIT_FAILURE); + } + GH_DESTROY(h); + if (!BLEFT(&b)) + break; + GC_DECRYPT(c, BCUR(&b), BCUR(&b), BLEFT(&b)); + if (fwrite(BCUR(&b), 1, BLEFT(&b), rfp) != BLEFT(&b)) { + if (f & f_progress) fprogress_done(&ff); + if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); + exit(EXIT_FAILURE); + } + } + + if (f & f_progress) fprogress_done(&ff); + if (fflush(rfp) || ferror(rfp)) { + if (verb) printf("FAIL error writing output: %s\n", strerror(errno)); + exit(EXIT_FAILURE); + } + if (f & f_buffer) { + if (!ofp && (ofp = fopen(of, "wb")) == 0) { + die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", + of, strerror(errno)); + } + rewind(rfp); + if (f & f_progress) fprogress_init(&ff, "copying buffer", rfp); + dstr_reset(&d); + dstr_ensure(&d, 65536); + if (verb && ofp == stdout) printf("DATA\n"); + for (;;) { + n = fread(d.buf, 1, d.sz, rfp); + if (!n) break; + if (f & f_progress) fprogress_update(&ff, n); + if (fwrite(d.buf, 1, n, ofp) < n) { + if (f & f_progress) fprogress_done(&ff); + die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); + } + } + if (f & f_progress) fprogress_done(&ff); + if (ferror(rfp) || fclose(rfp)) + die(EXIT_FAILURE, "error unbuffering output: %s", strerror(errno)); + } + + e->ops->decdone(e); + if (verb && ofp != stdout) + printf("OK decrypted successfully\n"); + if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp))) + die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); + freeenc(e); + GC_DESTROY(c); + GC_DESTROY(cx); + GM_DESTROY(m); + freekem(km); + if (fp != stdin) fclose(fp); + key_close(&kf); + dstr_destroy(&d); + return (0); + +#undef f_bogus +#undef f_buffer +#undef f_nocheck +#undef f_progress +} + +/*----- Main code ---------------------------------------------------------*/ + +#define LISTS(LI) \ + LI("Lists", list, \ + listtab[i].name, listtab[i].name) \ + LI("Key-encapsulation mechanisms", kem, \ + kemtab[i].name, kemtab[i].name) \ + LI("Signature schemes", sig, \ + sigtab[i].name, sigtab[i].name) \ + LI("Encodings", enc, \ + enctab[i].name, enctab[i].name) \ + LI("Symmetric encryption algorithms", cipher, \ + gciphertab[i], gciphertab[i]->name) \ + LI("Hash functions", hash, \ + ghashtab[i], ghashtab[i]->name) \ + LI("Message authentication codes", mac, \ + gmactab[i], gmactab[i]->name) + +MAKELISTTAB(listtab, LISTS) + +int cmd_show(int argc, char *argv[]) +{ + return (displaylists(listtab, argv + 1)); +} + +static int cmd_help(int, char **); + +static cmd cmdtab[] = { + { "help", cmd_help, "help [COMMAND...]" }, + { "show", cmd_show, "show [ITEM...]" }, + CMD_ENCODE, + CMD_DECODE, + { "encrypt", encrypt, + "encrypt [-apC] [-k TAG] [-s TAG] [-f FORMAT]\n\t\ +[-o OUTPUT] [FILE]", "\ +Options:\n\ +\n\ +-a, --armour Same as `-f pem'.\n\ +-f, --format=FORMAT Encode as FORMAT.\n\ +-k, --key=TAG Use public encryption key named by TAG.\n\ +-s, --sign-key=TAG Use private signature key named by TAG.\n\ +-o, --output=FILE Write output to FILE.\n\ +-p, --progress Show progress on large files.\n\ +-C, --nocheck Don't check the public key.\n\ +" }, + { "decrypt", decrypt, + "decrypt [-abpqvC] [-f FORMAT] [-o OUTPUT] [FILE]", "\ +Options:\n\ +\n\ +-a, --armour Same as `-f pem'.\n\ +-b, --buffer Buffer output until we're sure we have it all.\n\ +-f, --format=FORMAT Decode as FORMAT.\n\ +-o, --output=FILE Write output to FILE.\n\ +-p, --progress Show progress on large files.\n\ +-q, --quiet Produce fewer messages.\n\ +-v, --verbose Produce more verbose messages.\n\ +-C, --nocheck Don't check the private key.\n\ +" }, + { 0, 0, 0 } +}; + +static int cmd_help(int argc, char **argv) +{ + sc_help(cmdtab, stdout, argv + 1); + return (0); +} + +void version(FILE *fp) +{ + pquis(fp, "$, Catacomb version " VERSION "\n"); +} + +static void usage(FILE *fp) +{ + pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n"); +} + +void help_global(FILE *fp) +{ + usage(fp); + fputs("\n\ +Encrypt and decrypt files.\n\ +\n\ +Global command-line options:\n\ +\n\ +-h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\ +-v, --version Show program version number.\n\ +-u, --usage Show a terse usage message.\n\ +\n\ +-k, --keyring=FILE Read keys from FILE.\n", + fp); +} + +/* --- @main@ --- * + * + * Arguments: @int argc@ = number of command line arguments + * @char *argv[]@ = vector of command line arguments + * + * Returns: Zero if successful, nonzero otherwise. + * + * Use: Encrypts or decrypts files. + */ + +int main(int argc, char *argv[]) +{ + unsigned f = 0; + +#define f_bogus 1u + + /* --- Initialize the library --- */ + + ego(argv[0]); + sub_init(); + rand_noisesrc(RAND_GLOBAL, &noise_source); + rand_seed(RAND_GLOBAL, 160); + + /* --- Parse options --- */ + + for (;;) { + static struct option opts[] = { + { "help", 0, 0, 'h' }, + { "version", 0, 0, 'v' }, + { "usage", 0, 0, 'u' }, + { "keyring", OPTF_ARGREQ, 0, 'k' }, + { 0, 0, 0, 0 } + }; + int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); + if (i < 0) + break; + switch (i) { + case 'h': + sc_help(cmdtab, stdout, argv + optind); + exit(0); + break; + case 'v': + version(stdout); + exit(0); + break; + case 'u': + usage(stdout); + exit(0); + case 'k': + keyring = optarg; + break; + default: + f |= f_bogus; + break; + } + } + + argc -= optind; + argv += optind; + optind = 0; + if (f & f_bogus || argc < 1) { + usage(stderr); + exit(EXIT_FAILURE); + } + + /* --- Dispatch to the correct subcommand handler --- */ + + return (findcmd(cmdtab, argv[0])->cmd(argc, argv)); + +#undef f_bogus +} + +/*----- That's all, folks -------------------------------------------------*/