5 * (c) 2004 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
30 #define _FILE_OFFSET_BITS 64
34 #include <mLib/report.h>
54 /*----- Main code ---------------------------------------------------------*/
56 /* --- RSA PKCS1 --- */
58 typedef struct rsap1_sigctx {
64 static sig *rsap1_siginit(key *k, void *kd, const gchash *hc)
66 rsap1_sigctx *rs = CREATE(rsap1_sigctx);
67 rsa_privcreate(&rs->rp, kd, &rand_global);
68 rs->p1.r = &rand_global;
70 rs->p1.epsz = strlen(hc->name) + 1;
75 static int rsap1_sigdoit(sig *s, dstr *d)
77 rsap1_sigctx *rs = (rsap1_sigctx *)s;
79 mp *m = rsa_sign(&rs->rp, MP_NEW,
80 GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
81 pkcs1_sigencode, &rs->p1);
83 n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n);
84 d->len += n; mp_drop(m);
88 static const char *rsa_lengthcheck(mp *n)
90 if (mp_bits(n) < 1024) return ("key too short");
94 static const char *rsap1_sigcheck(sig *s)
96 rsap1_sigctx *rs = (rsap1_sigctx *)s;
98 if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e);
102 static void rsap1_sigdestroy(sig *s)
104 rsap1_sigctx *rs = (rsap1_sigctx *)s;
105 rsa_privdestroy(&rs->rp);
109 static const sigops rsap1_sig = {
110 rsa_privfetch, sizeof(rsa_priv),
111 rsap1_siginit, rsap1_sigdoit, rsap1_sigcheck, rsap1_sigdestroy
114 typedef struct rsap1_vrfctx {
120 static sig *rsap1_vrfinit(key *k, void *kd, const gchash *hc)
122 rsap1_vrfctx *rv = CREATE(rsap1_vrfctx);
123 rsa_pubcreate(&rv->rp, kd);
124 rv->p1.r = &rand_global;
125 rv->p1.ep = hc->name;
126 rv->p1.epsz = strlen(hc->name) + 1;
131 static int rsap1_vrfdoit(sig *s, dstr *d)
133 rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
134 mp *m = mp_loadb(MP_NEW, d->buf, d->len);
135 int rc = rsa_verify(&rv->rp, m,
136 GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
137 0, pkcs1_sigdecode, &rv->p1);
142 static const char *rsap1_vrfcheck(sig *s)
144 rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
146 if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e);
150 static void rsap1_vrfdestroy(sig *s)
152 rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
153 rsa_pubdestroy(&rv->rp);
157 static const sigops rsap1_vrf = {
158 rsa_pubfetch, sizeof(rsa_pub),
159 rsap1_vrfinit, rsap1_vrfdoit, rsap1_vrfcheck, rsap1_vrfdestroy
162 /* --- RSA PSS --- */
164 static const gccipher *getmgf(key *k, const gchash *hc)
170 if ((mm = key_getattr(0, k, "mgf")) == 0) {
171 dstr_putf(&d, "%s-mgf", hc->name);
174 if ((gc = gcipher_byname(mm)) == 0)
175 die(EXIT_FAILURE, "unknown encryption scheme `%s'", mm);
180 typedef struct rsapss_sigctx {
186 static sig *rsapss_siginit(key *k, void *kd, const gchash *hc)
188 rsapss_sigctx *rs = CREATE(rsapss_sigctx);
189 rsa_privcreate(&rs->rp, kd, &rand_global);
191 rs->p.r = &rand_global;
192 rs->p.cc = getmgf(k, hc);
194 rs->p.ssz = hc->hashsz;
198 static int rsapss_sigdoit(sig *s, dstr *d)
200 rsapss_sigctx *rs = (rsapss_sigctx *)s;
202 mp *m = rsa_sign(&rs->rp, MP_NEW,
203 GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
206 n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n);
207 d->len += n; mp_drop(m);
211 static const char *rsapss_sigcheck(sig *s)
213 rsapss_sigctx *rs = (rsapss_sigctx *)s;
215 if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e);
219 static void rsapss_sigdestroy(sig *s)
221 rsapss_sigctx *rs = (rsapss_sigctx *)s;
222 rsa_privdestroy(&rs->rp);
226 static const sigops rsapss_sig = {
227 rsa_privfetch, sizeof(rsa_priv),
228 rsapss_siginit, rsapss_sigdoit, rsapss_sigcheck, rsapss_sigdestroy
231 typedef struct rsapss_vrfctx {
237 static sig *rsapss_vrfinit(key *k, void *kd, const gchash *hc)
239 rsapss_vrfctx *rv = CREATE(rsapss_vrfctx);
240 rsa_pubcreate(&rv->rp, kd);
242 rv->p.r = &rand_global;
243 rv->p.cc = getmgf(k, hc);
245 rv->p.ssz = hc->hashsz;
249 static int rsapss_vrfdoit(sig *s, dstr *d)
251 rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
252 mp *m = mp_loadb(MP_NEW, d->buf, d->len);
253 int rc = rsa_verify(&rv->rp, m,
254 GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
255 0, pss_decode, &rv->p);
260 static const char *rsapss_vrfcheck(sig *s)
262 rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
264 if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e);
268 static void rsapss_vrfdestroy(sig *s)
270 rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
271 rsa_pubdestroy(&rv->rp);
275 static const sigops rsapss_vrf = {
276 rsa_pubfetch, sizeof(rsa_pub),
277 rsapss_vrfinit, rsapss_vrfdoit, rsapss_vrfcheck, rsapss_vrfdestroy
280 /* --- DSA and ECDSA --- */
282 typedef struct dsa_sigctx {
287 static void dsa_initcommon(dsa_sigctx *ds, const gchash *hc,
290 ds->g.r = &rand_global;
296 static dsa_sigctx *dsa_doinit(key *k, const gprime_param *gp,
297 mp *y, const gchash *hc,
298 group *(*makegroup)(const gprime_param *),
301 dsa_sigctx *ds = CREATE(dsa_sigctx);
305 if ((ds->g.g = makegroup(gp)) == 0)
306 die(EXIT_FAILURE, "bad %s group in key `%s'", what, t.buf);
307 ds->g.p = G_CREATE(ds->g.g);
308 if (G_FROMINT(ds->g.g, ds->g.p, y))
309 die(EXIT_FAILURE, "bad public key in key `%s'", t.buf);
310 dsa_initcommon(ds, hc, t.buf);
315 static dsa_sigctx *ecdsa_doinit(key *k, const char *cstr,
316 ec *y, const gchash *hc)
318 dsa_sigctx *ds = CREATE(dsa_sigctx);
324 if ((e = ec_getinfo(&ei, cstr)) != 0)
325 die(EXIT_FAILURE, "bad curve in key `%s': %s", t.buf, e);
326 ds->g.g = group_ec(&ei);
327 ds->g.p = G_CREATE(ds->g.g);
328 if (G_FROMEC(ds->g.g, ds->g.p, y))
329 die(EXIT_FAILURE, "bad public key in key `%s'", t.buf);
330 dsa_initcommon(ds, hc, t.buf);
335 static sig *dsa_siginit(key *k, void *kd, const gchash *hc)
338 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
339 ds->g.u = MP_COPY(dp->x);
343 static sig *bindsa_siginit(key *k, void *kd, const gchash *hc)
346 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
347 ds->g.u = MP_COPY(dp->x);
351 static sig *ecdsa_siginit(key *k, void *kd, const gchash *hc)
354 dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
355 ds->g.u = MP_COPY(ep->x);
359 static int dsa_sigdoit(sig *s, dstr *d)
361 dsa_sigctx *ds = (dsa_sigctx *)s;
362 gdsa_sig ss = GDSA_SIG_INIT;
363 size_t n = mp_octets(ds->g.g->r);
365 gdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0);
366 dstr_ensure(d, 2 * n);
367 mp_storeb(ss.r, d->buf, n);
368 mp_storeb(ss.s, d->buf + n, n);
370 mp_drop(ss.r); mp_drop(ss.s);
374 static const char *dsa_sigcheck(sig *s)
376 dsa_sigctx *ds = (dsa_sigctx *)s;
378 if ((e = G_CHECK(ds->g.g, &rand_global)) != 0)
380 if (group_check(ds->g.g, ds->g.p))
381 return ("public key not in subgroup");
385 static void dsa_sigdestroy(sig *s)
387 dsa_sigctx *ds = (dsa_sigctx *)s;
388 G_DESTROY(ds->g.g, ds->g.p);
390 G_DESTROYGROUP(ds->g.g);
394 static const sigops dsa_sig = {
395 dh_privfetch, sizeof(dh_priv),
396 dsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
399 static const sigops bindsa_sig = {
400 dh_privfetch, sizeof(dh_priv),
401 bindsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
404 static const sigops ecdsa_sig = {
405 ec_privfetch, sizeof(ec_priv),
406 ecdsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
409 static sig *dsa_vrfinit(key *k, void *kd, const gchash *hc)
412 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
416 static sig *bindsa_vrfinit(key *k, void *kd, const gchash *hc)
419 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
423 static sig *ecdsa_vrfinit(key *k, void *kd, const gchash *hc)
426 dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
430 static int dsa_vrfdoit(sig *s, dstr *d)
432 dsa_sigctx *ds = (dsa_sigctx *)s;
437 ss.r = mp_loadb(MP_NEW, d->buf, n);
438 ss.s = mp_loadb(MP_NEW, d->buf + n, d->len - n);
439 rc = gdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0));
440 mp_drop(ss.r); mp_drop(ss.s);
444 static const sigops dsa_vrf = {
445 dh_pubfetch, sizeof(dh_pub),
446 dsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
449 static const sigops bindsa_vrf = {
450 dh_pubfetch, sizeof(dh_pub),
451 bindsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
454 static const sigops ecdsa_vrf = {
455 ec_pubfetch, sizeof(ec_pub),
456 ecdsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
459 /* --- KCDSA and ECKCDSA --- */
461 static void kcdsa_privkey(dsa_sigctx *ds, mp *x)
462 { ds->g.u = mp_modinv(MP_NEW, x, ds->g.g->r); }
464 static void kcdsa_sethash(dsa_sigctx *ds, const gchash *hc)
465 { ds->s.h = gkcdsa_beginhash(&ds->g); }
467 static sig *kcdsa_siginit(key *k, void *kd, const gchash *hc)
470 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
471 kcdsa_privkey(ds, dp->x);
472 kcdsa_sethash(ds, hc);
476 static sig *binkcdsa_siginit(key *k, void *kd, const gchash *hc)
479 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
480 kcdsa_privkey(ds, dp->x);
481 kcdsa_sethash(ds, hc);
485 static sig *eckcdsa_siginit(key *k, void *kd, const gchash *hc)
488 dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
489 kcdsa_privkey(ds, ep->x);
490 kcdsa_sethash(ds, hc);
494 static int kcdsa_sigdoit(sig *s, dstr *d)
496 dsa_sigctx *ds = (dsa_sigctx *)s;
497 gkcdsa_sig ss = GKCDSA_SIG_INIT;
498 size_t hsz = ds->g.h->hashsz, n = mp_octets(ds->g.g->r);
500 gkcdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0);
501 dstr_ensure(d, hsz + n);
502 memcpy(d->buf, ss.r, hsz);
503 mp_storeb(ss.s, d->buf + hsz, n);
505 xfree(ss.r); mp_drop(ss.s);
509 static const sigops kcdsa_sig = {
510 dh_privfetch, sizeof(dh_priv),
511 kcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
514 static const sigops binkcdsa_sig = {
515 dh_privfetch, sizeof(dh_priv),
516 binkcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
519 static const sigops eckcdsa_sig = {
520 ec_privfetch, sizeof(ec_priv),
521 eckcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
524 static sig *kcdsa_vrfinit(key *k, void *kd, const gchash *hc)
527 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
528 kcdsa_sethash(ds, hc);
532 static sig *binkcdsa_vrfinit(key *k, void *kd, const gchash *hc)
535 dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
536 kcdsa_sethash(ds, hc);
540 static sig *eckcdsa_vrfinit(key *k, void *kd, const gchash *hc)
543 dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
544 kcdsa_sethash(ds, hc);
548 static int kcdsa_vrfdoit(sig *s, dstr *d)
550 dsa_sigctx *ds = (dsa_sigctx *)s;
552 size_t hsz = ds->g.h->hashsz, n = d->len - hsz;
557 ss.r = (octet *)d->buf;
558 ss.s = mp_loadb(MP_NEW, d->buf + hsz, n);
559 rc = gkcdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0));
564 static const sigops kcdsa_vrf = {
565 dh_pubfetch, sizeof(dh_pub),
566 kcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
569 static const sigops binkcdsa_vrf = {
570 dh_pubfetch, sizeof(dh_pub),
571 binkcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
574 static const sigops eckcdsa_vrf = {
575 ec_pubfetch, sizeof(ec_pub),
576 eckcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
582 _(ed25519, ed25519ctx, ED25519, "Ed25519", sha512) \
583 _(ed448, ed448, ED448, "Ed448", shake256)
585 typedef struct eddsa_sigctx {
590 static sig *eddsa_siginit(key *k, void *kd, const gchash *hc)
592 eddsa_sigctx *es = CREATE(eddsa_sigctx);
594 es->perso = key_getattr(0, k, "perso");
595 if (es->perso && strlen(es->perso) > ED25519_MAXPERSOSZ) {
596 die(1, "EdDSA personalization string too long (max length %d)",
602 static void eddsa_sigdestroy(sig *s)
603 { eddsa_sigctx *es = (eddsa_sigctx *)s; DESTROY(es); }
605 #define EDDSADEF(ed, sigver, ED, name, hash) \
607 static int ed##_sigdoit(sig *s, dstr *d) \
609 eddsa_sigctx *es = (eddsa_sigctx *)s; \
610 ed##_priv *k = es->s.kd; \
612 dstr_ensure(d, ED##_SIGSZ); \
613 sigver##_sign((octet *)d->buf, k->priv.k, k->priv.sz, k->pub.k, \
614 es->perso ? 1 : -1, es->perso, \
615 es->perso ? strlen(es->perso) : 0, \
616 GH_DONE(es->s.h, 0), GH_CLASS(es->s.h)->hashsz); \
617 d->len += ED##_SIGSZ; \
621 static const char *ed##_sigcheck(sig *s) \
623 eddsa_sigctx *es = (eddsa_sigctx *)s; \
624 ed##_priv *k = es->s.kd; \
626 if (k->pub.sz != ED##_PUBSZ) \
627 return ("incorrect " #name " public key length"); \
631 static const sigops ed##_sig = { \
632 ed##_privfetch, sizeof(ed##_priv), \
633 eddsa_siginit, ed##_sigdoit, ed##_sigcheck, eddsa_sigdestroy \
636 static int ed##_vrfdoit(sig *s, dstr *d) \
638 eddsa_sigctx *es = (eddsa_sigctx *)s; \
639 ed##_pub *k = es->s.kd; \
641 if (d->len != ED##_SIGSZ) return (-1); \
642 return (sigver##_verify(k->pub.k, \
643 es->perso ? 1 : -1, es->perso, \
644 es->perso ? strlen(es->perso) : 0, \
645 GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz, \
646 (const octet *)d->buf)); \
649 static const char *ed##_vrfcheck(sig *s) \
651 ed##_pub *k = s->kd; \
653 if (k->pub.sz != ED##_PUBSZ) \
654 return ("incorrect " #name " public key length"); \
658 static const sigops ed##_vrf = { \
659 ed##_pubfetch, sizeof(ed##_pub), \
660 eddsa_siginit, ed##_vrfdoit, ed##_vrfcheck, eddsa_sigdestroy \
666 /* --- Symmetric message authentication --- */
668 typedef struct mac_ctx {
676 static sig *mac_init(key *k, void *kd, const gchash *hc)
686 m->kp.e = KENC_BINARY;
690 if ((mm = key_getattr(0 /*yik*/, k, "mac")) == 0) {
691 dstr_putf(&d, "%s-hmac", hc->name);
694 if ((m->mc = gmac_byname(mm)) == 0)
695 die(EXIT_FAILURE, "unknown message authentication scheme `%s'", mm);
698 if ((err = key_unpack(&m->kp, kd, &d)) != 0) {
699 die(EXIT_FAILURE, "failed to unpack symmetric key `%s': %s",
700 d.buf, key_strerror(err));
704 if (keysz(m->kb.sz, m->mc->keysz) != m->kb.sz) {
705 die(EXIT_FAILURE, "bad key size %lu for `%s'",
706 (unsigned long)m->kb.sz, m->mc->name);
708 m->m = GM_KEY(m->mc, m->kb.k, m->kb.sz);
709 m->s.h = GM_INIT(m->m);
713 static int mac_sigdoit(sig *s, dstr *d)
715 mac_ctx *m = (mac_ctx *)s;
717 dstr_ensure(d, m->mc->hashsz);
718 GH_DONE(m->s.h, d->buf);
719 d->len += m->mc->hashsz;
723 static int mac_vrfdoit(sig *s, dstr *d)
725 mac_ctx *m = (mac_ctx *)s;
728 t = GH_DONE(m->s.h, 0);
729 if (d->len != m->mc->hashsz || !ct_memeq(d->buf, t, d->len))
734 static const char *mac_check(sig *s) { return (0); }
736 static void mac_destroy(sig *s)
738 mac_ctx *m = (mac_ctx *)s;
740 key_unpackdone(&m->kp);
743 static const sigops mac_sig = {
745 mac_init, mac_sigdoit, mac_check, mac_destroy
748 static const sigops mac_vrf = {
750 mac_init, mac_vrfdoit, mac_check, mac_destroy
753 /* --- The switch table --- */
755 const struct sigtab sigtab[] = {
756 { "rsapkcs1", &rsap1_sig, &rsap1_vrf, &sha },
757 { "rsapss", &rsapss_sig, &rsapss_vrf, &sha },
758 { "dsa", &dsa_sig, &dsa_vrf, &sha },
759 { "bindsa", &bindsa_sig, &bindsa_vrf, &sha },
760 { "ecdsa", &ecdsa_sig, &ecdsa_vrf, &sha },
761 { "kcdsa", &kcdsa_sig, &kcdsa_vrf, &has160 },
762 { "binkcdsa", &binkcdsa_sig, &binkcdsa_vrf, &has160 },
763 { "eckcdsa", &eckcdsa_sig, &eckcdsa_vrf, &has160 },
764 #define EDDSATAB(ed, sigver, ED, name, hash) \
765 { #ed, &ed##_sig, &ed##_vrf, &hash },
768 { "mac", &mac_sig, &mac_vrf, &rmd160 },
772 /* --- @getsig@ --- *
774 * Arguments: @key *k@ = the key to load
775 * @const char *app@ = application name
776 * @int wantpriv@ = nonzero if we want to sign
778 * Returns: A signature-making thing.
780 * Use: Loads a key and starts hashing.
783 sig *getsig(key *k, const char *app, int wantpriv)
785 const char *salg, *halg = 0;
792 const struct sigtab *st;
799 /* --- Setup stuff --- */
803 /* --- Get the signature algorithm --- *
805 * Take the attribute if it's there; otherwise use the key type.
809 if ((q = key_getattr(0, k, "sig")) != 0) {
812 } else if (strncmp(k->type, app, n) == 0 && k->type[n] == '-') {
813 dstr_puts(&d, k->type);
816 die(EXIT_FAILURE, "no signature algorithm for key `%s'", t.buf);
818 /* --- Grab the hash algorithm --- *
820 * Grab it from the signature algorithm if it's there. But override that
821 * from the attribute.
825 if ((p = strchr(p, '/')) != 0) {
829 if ((q = key_getattr(0, k, "hash")) != 0)
832 /* --- Look up the algorithms in the table --- */
834 for (st = sigtab; st->name; st++) {
835 if (strcmp(st->name, salg) == 0)
838 die(EXIT_FAILURE, "signature algorithm `%s' not found in key `%s'",
844 if ((ch = ghash_byname(halg)) == 0) {
845 die(EXIT_FAILURE, "hash algorithm `%s' not found in key `%s'",
849 so = wantpriv ? st->signops : st->verifyops;
851 /* --- Load the key --- */
858 kd = xmalloc(so->kdsz);
859 kp = key_fetchinit(so->kf, 0, kd);
860 if ((e = key_fetch(kp, k)) != 0) {
861 die(EXIT_FAILURE, "error fetching key `%s': %s",
862 t.buf, key_strerror(e));
865 s = so->init(k, kd, ch);
873 /* --- Free stuff up --- */
880 /* --- @freesig@ --- *
882 * Arguments: @sig *s@ = signature-making thing
886 * Use: Frees up a signature-making thing
895 key_fetchdone(s->kp);
901 /*----- That's all, folks -------------------------------------------------*/