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 = {
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[] = {
{ "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 }
};
/* --- Load the key --- */
- 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));
+ if (!so->kf) {
+ kd = k->k;
+ key_incref(kd);
+ } 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 --- */
void freesig(sig *s)
{
GH_DESTROY(s->h);
- key_fetchdone(s->kp);
- xfree(s->kd);
+ if (!s->ops->kf)
+ key_drop(s->kd);
+ else {
+ key_fetchdone(s->kp);
+ xfree(s->kd);
+ }
s->ops->destroy(s);
}