--- /dev/null
+/* -*-c-*-
+ *
+ * Catcrypt signatures
+ *
+ * (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 <stdlib.h>
+
+#include <mLib/report.h>
+
+#include "rand.h"
+#include "sha.h"
+#include "has160.h"
+
+#include "ec.h"
+#include "ec-keys.h"
+#include "dh.h"
+#include "gdsa.h"
+#include "gkcdsa.h"
+#include "rsa.h"
+
+#include "cc.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- RSA PKCS1 --- */
+
+typedef struct rsap1_sigctx {
+ sig s;
+ rsa_privctx rp;
+ pkcs1 p1;
+} rsap1_sigctx;
+
+static sig *rsap1_siginit(key *k, void *kd, const gchash *hc)
+{
+ rsap1_sigctx *rs = CREATE(rsap1_sigctx);
+ rsa_privcreate(&rs->rp, kd, &rand_global);
+ rs->p1.r = &rand_global;
+ rs->p1.ep = hc->name;
+ rs->p1.epsz = strlen(hc->name) + 1;
+ rs->s.h = 0;
+ return (&rs->s);
+}
+
+static int rsap1_sigdoit(sig *s, dstr *d)
+{
+ rsap1_sigctx *rs = (rsap1_sigctx *)s;
+ size_t n;
+ mp *m = rsa_sign(&rs->rp, MP_NEW,
+ GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
+ pkcs1_sigencode, &rs->p1);
+ if (!m) return (-1);
+ n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n);
+ d->len += n; mp_drop(m);
+ return (0);
+}
+
+static const char *rsa_lengthcheck(mp *n)
+{
+ if (mp_bits(n) < 1024) return ("key too short");
+ return (0);
+}
+
+static const char *rsap1_sigcheck(sig *s)
+{
+ rsap1_sigctx *rs = (rsap1_sigctx *)s;
+ const char *e;
+ if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e);
+ return (0);
+}
+
+static void rsap1_sigdestroy(sig *s)
+{
+ rsap1_sigctx *rs = (rsap1_sigctx *)s;
+ rsa_privdestroy(&rs->rp);
+ DESTROY(rs);
+}
+
+static const sigops rsap1_sig = {
+ rsa_privfetch, sizeof(rsa_priv),
+ rsap1_siginit, rsap1_sigdoit, rsap1_sigcheck, rsap1_sigdestroy
+};
+
+typedef struct rsap1_vrfctx {
+ sig s;
+ rsa_pubctx rp;
+ pkcs1 p1;
+} rsap1_vrfctx;
+
+static sig *rsap1_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ rsap1_vrfctx *rv = CREATE(rsap1_vrfctx);
+ rsa_pubcreate(&rv->rp, kd);
+ rv->p1.r = &rand_global;
+ rv->p1.ep = hc->name;
+ rv->p1.epsz = strlen(hc->name) + 1;
+ rv->s.h = 0;
+ return (&rv->s);
+}
+
+static int rsap1_vrfdoit(sig *s, dstr *d)
+{
+ rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
+ mp *m = mp_loadb(MP_NEW, d->buf, d->len);
+ int rc = rsa_verify(&rv->rp, m,
+ GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
+ 0, pkcs1_sigdecode, &rv->p1);
+ mp_drop(m);
+ return (rc);
+}
+
+static const char *rsap1_vrfcheck(sig *s)
+{
+ rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
+ const char *e;
+ if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e);
+ return (0);
+}
+
+static void rsap1_vrfdestroy(sig *s)
+{
+ rsap1_vrfctx *rv = (rsap1_vrfctx *)s;
+ rsa_pubdestroy(&rv->rp);
+ DESTROY(rv);
+}
+
+static const sigops rsap1_vrf = {
+ rsa_pubfetch, sizeof(rsa_pub),
+ rsap1_vrfinit, rsap1_vrfdoit, rsap1_vrfcheck, rsap1_vrfdestroy
+};
+
+/* --- RSA PSS --- */
+
+static const gccipher *getmgf(key *k, const gchash *hc)
+{
+ dstr d = DSTR_INIT;
+ const gccipher *gc;
+ const char *mm;
+
+ if ((mm = key_getattr(0, k, "mgf")) == 0) {
+ dstr_putf(&d, "%s-mgf", hc->name);
+ mm = d.buf;
+ }
+ if ((gc = gcipher_byname(mm)) == 0)
+ die(EXIT_FAILURE, "unknown encryption scheme `%s'", mm);
+ dstr_destroy(&d);
+ return (gc);
+}
+
+typedef struct rsapss_sigctx {
+ sig s;
+ rsa_privctx rp;
+ pss p;
+} rsapss_sigctx;
+
+static sig *rsapss_siginit(key *k, void *kd, const gchash *hc)
+{
+ rsapss_sigctx *rs = CREATE(rsapss_sigctx);
+ rsa_privcreate(&rs->rp, kd, &rand_global);
+ rs->p.r = &rand_global;
+ rs->p.cc = getmgf(k, hc);
+ rs->p.ch = hc;
+ rs->p.ssz = hc->hashsz;
+ rsa_privdestroy(&rs->rp);
+ return (&rs->s);
+}
+
+static int rsapss_sigdoit(sig *s, dstr *d)
+{
+ rsapss_sigctx *rs = (rsapss_sigctx *)s;
+ size_t n;
+ mp *m = rsa_sign(&rs->rp, MP_NEW,
+ GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
+ pss_encode, &rs->p);
+ if (!m) return (-1);
+ n = mp_octets(rs->rp.rp->n); dstr_ensure(d, n); mp_storeb(m, d->buf, n);
+ d->len += n; mp_drop(m);
+ return (0);
+}
+
+static const char *rsapss_sigcheck(sig *s)
+{
+ rsapss_sigctx *rs = (rsapss_sigctx *)s;
+ const char *e;
+ if ((e = rsa_lengthcheck(rs->rp.rp->n)) != 0) return (e);
+ return (0);
+}
+
+static void rsapss_sigdestroy(sig *s)
+{
+ rsapss_sigctx *rs = (rsapss_sigctx *)s;
+ rsa_privdestroy(&rs->rp);
+ DESTROY(rs);
+}
+
+static const sigops rsapss_sig = {
+ rsa_privfetch, sizeof(rsa_priv),
+ rsapss_siginit, rsapss_sigdoit, rsapss_sigcheck, rsapss_sigdestroy
+};
+
+typedef struct rsapss_vrfctx {
+ sig s;
+ rsa_pubctx rp;
+ pss p;
+} rsapss_vrfctx;
+
+static sig *rsapss_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ rsapss_vrfctx *rv = CREATE(rsapss_vrfctx);
+ rsa_pubcreate(&rv->rp, kd);
+ rv->p.r = &rand_global;
+ rv->p.cc = getmgf(k, hc);
+ rv->p.ch = hc;
+ rv->p.ssz = hc->hashsz;
+ return (&rv->s);
+}
+
+static int rsapss_vrfdoit(sig *s, dstr *d)
+{
+ rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
+ mp *m = mp_loadb(MP_NEW, d->buf, d->len);
+ int rc = rsa_verify(&rv->rp, m,
+ GH_DONE(s->h, 0), GH_CLASS(s->h)->hashsz,
+ 0, pss_decode, &rv->p);
+ mp_drop(m);
+ return (rc);
+}
+
+static const char *rsapss_vrfcheck(sig *s)
+{
+ rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
+ const char *e;
+ if ((e = rsa_lengthcheck(rv->rp.rp->n)) != 0) return (e);
+ return (0);
+}
+
+static void rsapss_vrfdestroy(sig *s)
+{
+ rsapss_vrfctx *rv = (rsapss_vrfctx *)s;
+ rsa_pubdestroy(&rv->rp);
+ DESTROY(rv);
+}
+
+static const sigops rsapss_vrf = {
+ rsa_pubfetch, sizeof(rsa_pub),
+ rsapss_vrfinit, rsapss_vrfdoit, rsapss_vrfcheck, rsapss_vrfdestroy
+};
+
+/* --- DSA and ECDSA --- */
+
+typedef struct dsa_sigctx {
+ sig s;
+ gdsa g;
+} dsa_sigctx;
+
+static void dsa_initcommon(dsa_sigctx *ds, const gchash *hc,
+ const char *ktag)
+{
+ ds->g.r = &rand_global;
+ ds->g.h = hc;
+ ds->g.u = MP_NEW;
+ ds->s.h = 0;
+}
+
+static dsa_sigctx *dsa_doinit(key *k, const gprime_param *gp,
+ mp *y, const gchash *hc,
+ group *(*makegroup)(const gprime_param *),
+ const char *what)
+{
+ dsa_sigctx *ds = CREATE(dsa_sigctx);
+ dstr t = DSTR_INIT;
+
+ key_fulltag(k, &t);
+ if ((ds->g.g = makegroup(gp)) == 0)
+ die(EXIT_FAILURE, "bad %s group in key `%s'", what, t.buf);
+ ds->g.p = G_CREATE(ds->g.g);
+ if (G_FROMINT(ds->g.g, ds->g.p, y))
+ die(EXIT_FAILURE, "bad public key in key `%s'", t.buf);
+ dsa_initcommon(ds, hc, t.buf);
+ dstr_destroy(&t);
+ return (ds);
+}
+
+static dsa_sigctx *ecdsa_doinit(key *k, const char *cstr,
+ ec *y, const gchash *hc)
+{
+ dsa_sigctx *ds = CREATE(dsa_sigctx);
+ ec_info ei;
+ const char *e;
+ dstr t = DSTR_INIT;
+
+ key_fulltag(k, &t);
+ if ((e = ec_getinfo(&ei, cstr)) != 0)
+ die(EXIT_FAILURE, "bad curve in key `%s': %s", t.buf, e);
+ ds->g.g = group_ec(&ei);
+ ds->g.p = G_CREATE(ds->g.g);
+ if (G_FROMEC(ds->g.g, ds->g.p, y))
+ die(EXIT_FAILURE, "bad public key in key `%s'", t.buf);
+ dsa_initcommon(ds, hc, t.buf);
+ dstr_destroy(&t);
+ return (ds);
+}
+
+static sig *dsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ dh_priv *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
+ ds->g.u = MP_COPY(dp->x);
+ return (&ds->s);
+}
+
+static sig *bindsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ dh_priv *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
+ ds->g.u = MP_COPY(dp->x);
+ return (&ds->s);
+}
+
+static sig *ecdsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ ec_priv *ep = kd;
+ dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
+ ds->g.u = MP_COPY(ep->x);
+ return (&ds->s);
+}
+
+static int dsa_sigdoit(sig *s, dstr *d)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ gdsa_sig ss = GDSA_SIG_INIT;
+ size_t n = mp_octets(ds->g.g->r);
+
+ gdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0);
+ dstr_ensure(d, 2 * n);
+ mp_storeb(ss.r, d->buf, n);
+ mp_storeb(ss.s, d->buf + n, n);
+ d->len += 2 * n;
+ mp_drop(ss.r); mp_drop(ss.s);
+ return (0);
+}
+
+static const char *dsa_sigcheck(sig *s)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ const char *e;
+ if ((e = G_CHECK(ds->g.g, &rand_global)) != 0)
+ return (0);
+ if (group_check(ds->g.g, ds->g.p))
+ return ("public key not in subgroup");
+ return (0);
+}
+
+static void dsa_sigdestroy(sig *s)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ G_DESTROY(ds->g.g, ds->g.p);
+ mp_drop(ds->g.u);
+ G_DESTROYGROUP(ds->g.g);
+ DESTROY(ds);
+}
+
+static const sigops dsa_sig = {
+ dh_privfetch, sizeof(dh_priv),
+ dsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops bindsa_sig = {
+ dh_privfetch, sizeof(dh_priv),
+ bindsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops ecdsa_sig = {
+ ec_privfetch, sizeof(ec_priv),
+ ecdsa_siginit, dsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static sig *dsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ dh_pub *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
+ return (&ds->s);
+}
+
+static sig *bindsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ dh_pub *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
+ return (&ds->s);
+}
+
+static sig *ecdsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ ec_pub *ep = kd;
+ dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
+ return (&ds->s);
+}
+
+static int dsa_vrfdoit(sig *s, dstr *d)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ gdsa_sig ss;
+ size_t n = d->len/2;
+ int rc;
+
+ ss.r = mp_loadb(MP_NEW, d->buf, n);
+ ss.s = mp_loadb(MP_NEW, d->buf + n, d->len - n);
+ rc = gdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0));
+ mp_drop(ss.r); mp_drop(ss.s);
+ return (rc);
+}
+
+static const sigops dsa_vrf = {
+ dh_pubfetch, sizeof(dh_pub),
+ dsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops bindsa_vrf = {
+ dh_pubfetch, sizeof(dh_pub),
+ bindsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops ecdsa_vrf = {
+ ec_pubfetch, sizeof(ec_pub),
+ ecdsa_vrfinit, dsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+/* --- KCDSA and ECKCDSA --- */
+
+static void kcdsa_privkey(dsa_sigctx *ds, mp *x)
+ { ds->g.u = mp_modinv(MP_NEW, x, ds->g.g->r); }
+
+static void kcdsa_sethash(dsa_sigctx *ds, const gchash *hc)
+ { ds->s.h = gkcdsa_beginhash(&ds->g); }
+
+static sig *kcdsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ dh_priv *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
+ kcdsa_privkey(ds, dp->x);
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static sig *binkcdsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ dh_priv *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
+ kcdsa_privkey(ds, dp->x);
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static sig *eckcdsa_siginit(key *k, void *kd, const gchash *hc)
+{
+ ec_priv *ep = kd;
+ dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
+ kcdsa_privkey(ds, ep->x);
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static int kcdsa_sigdoit(sig *s, dstr *d)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ gkcdsa_sig ss = GKCDSA_SIG_INIT;
+ size_t hsz = ds->g.h->hashsz, n = mp_octets(ds->g.g->r);
+
+ gkcdsa_sign(&ds->g, &ss, GH_DONE(ds->s.h, 0), 0);
+ dstr_ensure(d, hsz + n);
+ memcpy(d->buf, ss.r, hsz);
+ mp_storeb(ss.s, d->buf + hsz, n);
+ d->len += hsz + n;
+ xfree(ss.r); mp_drop(ss.s);
+ return (0);
+}
+
+static const sigops kcdsa_sig = {
+ dh_privfetch, sizeof(dh_priv),
+ kcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops binkcdsa_sig = {
+ dh_privfetch, sizeof(dh_priv),
+ binkcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops eckcdsa_sig = {
+ ec_privfetch, sizeof(ec_priv),
+ eckcdsa_siginit, kcdsa_sigdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static sig *kcdsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ dh_pub *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_prime, "prime");
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static sig *binkcdsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ dh_pub *dp = kd;
+ dsa_sigctx *ds = dsa_doinit(k, &dp->dp, dp->y, hc, group_binary, "binary");
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static sig *eckcdsa_vrfinit(key *k, void *kd, const gchash *hc)
+{
+ ec_pub *ep = kd;
+ dsa_sigctx *ds = ecdsa_doinit(k, ep->cstr, &ep->p, hc);
+ kcdsa_sethash(ds, hc);
+ return (&ds->s);
+}
+
+static int kcdsa_vrfdoit(sig *s, dstr *d)
+{
+ dsa_sigctx *ds = (dsa_sigctx *)s;
+ gkcdsa_sig ss;
+ size_t hsz = ds->g.h->hashsz, n = d->len - hsz;
+ int rc;
+
+ if (d->len < hsz)
+ return (-1);
+ ss.r = (octet *)d->buf;
+ ss.s = mp_loadb(MP_NEW, d->buf + hsz, n);
+ rc = gkcdsa_verify(&ds->g, &ss, GH_DONE(ds->s.h, 0));
+ mp_drop(ss.s);
+ return (rc);
+}
+
+static const sigops kcdsa_vrf = {
+ dh_pubfetch, sizeof(dh_pub),
+ kcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops binkcdsa_vrf = {
+ dh_pubfetch, sizeof(dh_pub),
+ binkcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+static const sigops eckcdsa_vrf = {
+ ec_pubfetch, sizeof(ec_pub),
+ eckcdsa_vrfinit, kcdsa_vrfdoit, dsa_sigcheck, dsa_sigdestroy
+};
+
+/* --- Symmetric message authentication --- */
+
+typedef struct mac_ctx {
+ sig s;
+ const gcmac *mc;
+ gmac *m;
+ key_packdef kp;
+ key_bin kb;
+} mac_ctx;
+
+static sig *mac_init(key *k, void *kd, const gchash *hc)
+{
+ mac_ctx *m;
+ dstr d = DSTR_INIT;
+ int err;
+ const char *mm;
+
+ m = CREATE(mac_ctx);
+
+ key_fulltag(k, &d);
+ m->kp.e = KENC_BINARY;
+ m->kp.p = &m->kb;
+ m->kp.kd = 0;
+
+ if ((mm = key_getattr(0 /*yik*/, k, "mac")) == 0) {
+ dstr_putf(&d, "%s-hmac", hc->name);
+ mm = d.buf;
+ }
+ if ((m->mc = gmac_byname(mm)) == 0)
+ die(EXIT_FAILURE, "unknown message authentication scheme `%s'", mm);
+ dstr_reset(&d);
+
+ if ((err = key_unpack(&m->kp, kd, &d)) != 0) {
+ die(EXIT_FAILURE, "failed to unpack symmetric key `%s': %s",
+ d.buf, key_strerror(err));
+ }
+ dstr_destroy(&d);
+
+ if (keysz(m->kb.sz, m->mc->keysz) != m->kb.sz) {
+ die(EXIT_FAILURE, "bad key size %lu for `%s'",
+ (unsigned long)m->kb.sz, m->mc->name);
+ }
+ m->m = GM_KEY(m->mc, m->kb.k, m->kb.sz);
+ m->s.h = GM_INIT(m->m);
+ return (&m->s);
+}
+
+static int mac_sigdoit(sig *s, dstr *d)
+{
+ mac_ctx *m = (mac_ctx *)s;
+
+ dstr_ensure(d, m->mc->hashsz);
+ GH_DONE(m->s.h, d->buf);
+ d->len += m->mc->hashsz;
+ return (0);
+}
+
+static int mac_vrfdoit(sig *s, dstr *d)
+{
+ mac_ctx *m = (mac_ctx *)s;
+ const octet *t;
+
+ t = GH_DONE(m->s.h, 0);
+ if (d->len != m->mc->hashsz || memcmp(d->buf, t, d->len) != 0)
+ return (-1);
+ return (0);
+}
+
+static const char *mac_check(sig *s) { return (0); }
+
+static void mac_destroy(sig *s)
+{
+ mac_ctx *m = (mac_ctx *)s;
+ GM_DESTROY(m->m);
+ key_unpackdone(&m->kp);
+}
+
+static const sigops mac_sig = {
+ 0, 0,
+ mac_init, mac_sigdoit, mac_check, mac_destroy
+};
+
+static const sigops mac_vrf = {
+ 0, 0,
+ mac_init, mac_vrfdoit, mac_check, mac_destroy
+};
+
+/* --- The switch table --- */
+
+const struct sigtab sigtab[] = {
+ { "rsapkcs1", &rsap1_sig, &rsap1_vrf, &sha },
+ { "rsapss", &rsapss_sig, &rsapss_vrf, &sha },
+ { "dsa", &dsa_sig, &dsa_vrf, &sha },
+ { "bindsa", &bindsa_sig, &bindsa_vrf, &sha },
+ { "ecdsa", &ecdsa_sig, &ecdsa_vrf, &sha },
+ { "kcdsa", &kcdsa_sig, &kcdsa_vrf, &has160 },
+ { "binkcdsa", &binkcdsa_sig, &binkcdsa_vrf, &has160 },
+ { "eckcdsa", &eckcdsa_sig, &eckcdsa_vrf, &has160 },
+ { "mac", &mac_sig, &mac_vrf, &rmd160 },
+ { 0, 0, 0 }
+};
+
+/* --- @getsig@ --- *
+ *
+ * Arguments: @key *k@ = the key to load
+ * @const char *app@ = application name
+ * @int wantpriv@ = nonzero if we want to sign
+ *
+ * Returns: A signature-making thing.
+ *
+ * Use: Loads a key and starts hashing.
+ */
+
+sig *getsig(key *k, const char *app, int wantpriv)
+{
+ const char *salg, *halg = 0;
+ dstr d = DSTR_INIT;
+ dstr t = DSTR_INIT;
+ char *p = 0;
+ const char *q;
+ sig *s;
+ size_t n;
+ const struct sigtab *st;
+ const sigops *so;
+ const gchash *ch;
+ void *kd;
+ int e;
+ key_packdef *kp;
+
+ /* --- Setup stuff --- */
+
+ key_fulltag(k, &t);
+
+ /* --- Get the signature algorithm --- *
+ *
+ * Take the attribute if it's there; otherwise use the key type.
+ */
+
+ n = strlen(app);
+ if ((q = key_getattr(0, k, "sig")) != 0) {
+ dstr_puts(&d, q);
+ p = d.buf;
+ } else if (strncmp(k->type, app, n) == 0 && k->type[n] == '-') {
+ dstr_puts(&d, k->type);
+ p = d.buf + n + 1;
+ } else
+ die(EXIT_FAILURE, "no signature algorithm for key `%s'", t.buf);
+
+ /* --- Grab the hash algorithm --- *
+ *
+ * Grab it from the signature algorithm if it's there. But override that
+ * from the attribute.
+ */
+
+ salg = p;
+ if ((p = strchr(p, '/')) != 0) {
+ *p++ = 0;
+ halg = p;
+ }
+ if ((q = key_getattr(0, k, "hash")) != 0)
+ halg = q;
+
+ /* --- Look up the algorithms in the table --- */
+
+ for (st = sigtab; st->name; st++) {
+ if (strcmp(st->name, salg) == 0)
+ goto s_found;
+ }
+ die(EXIT_FAILURE, "signature algorithm `%s' not found in key `%s'",
+ salg, t.buf);
+s_found:;
+ if (!halg)
+ ch = st->ch;
+ else {
+ if ((ch = ghash_byname(halg)) == 0) {
+ die(EXIT_FAILURE, "hash algorithm `%s' not found in key `%s'",
+ halg, t.buf);
+ }
+ }
+ so = wantpriv ? st->signops : st->verifyops;
+
+ /* --- Load the key --- */
+
+ if (!so->kf) {
+ kd = k->k;
+ key_incref(kd);
+ kp = 0;
+ } else {
+ kd = xmalloc(so->kdsz);
+ kp = key_fetchinit(so->kf, 0, kd);
+ if ((e = key_fetch(kp, k)) != 0) {
+ die(EXIT_FAILURE, "error fetching key `%s': %s",
+ t.buf, key_strerror(e));
+ }
+ }
+ s = so->init(k, kd, ch);
+ if (!s->h)
+ s->h = GH_INIT(ch);
+ s->kp = kp;
+ s->ops = so;
+ s->kd = kd;
+ s->ch = ch;
+
+ /* --- Free stuff up --- */
+
+ dstr_destroy(&d);
+ dstr_destroy(&t);
+ return (s);
+}
+
+/* --- @freesig@ --- *
+ *
+ * Arguments: @sig *s@ = signature-making thing
+ *
+ * Returns: ---
+ *
+ * Use: Frees up a signature-making thing
+ */
+
+void freesig(sig *s)
+{
+ GH_DESTROY(s->h);
+ if (!s->ops->kf)
+ key_drop(s->kd);
+ else {
+ key_fetchdone(s->kp);
+ xfree(s->kd);
+ }
+ s->ops->destroy(s);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff