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scd: Fix ECC support.

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* scd/app-openpgp.c (send_key_attr): Send KEYNO.
(get_public_key): Fix SEXP composing.
(ecc_writekey): Fix OID length calculation.
(ecc_oid): Prepend the length before query.
(parse_algorithm_attribute): Handle the case the curve is not available.
This commit is contained in:
NIIBE Yutaka 2015-08-05 07:59:50 +09:00
parent 4a326d7c9a
commit 0751571cac
1 changed files with 44 additions and 17 deletions
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61
scd/app-openpgp.c
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@ -914,7 +914,7 @@ send_key_attr (ctrl_t ctrl, app_t app, const char *keyword, int keyno)
openpgp_oid_to_curve (app->app_local->keyattr[keyno].ecc.oid));
}
else
snprintf (buffer, sizeof buffer, "0 0 UNKNOWN");
snprintf (buffer, sizeof buffer, "%d 0 0 UNKNOWN", keyno+1);
send_status_direct (ctrl, keyword, buffer);
}
@ -1434,11 +1434,15 @@ get_public_key (app_t app, int keyno)
}
else if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_ECC)
{
err = gcry_sexp_build (&s_pkey, NULL,
"(public-key(ecc(curve%s)%s(q%b)))",
openpgp_oid_to_curve (app->app_local->keyattr[keyno].ecc.oid),
app->app_local->keyattr[keyno].ecc.flags?
"(flags eddsa)" : "",
char *format;
if (!app->app_local->keyattr[keyno].ecc.flags)
format = "(public-key(ecc(curve%s)(q%b)))";
else
format = "(public-key(ecc(curve%s)(flags eddsa)(q%b)))";
err = gcry_sexp_build (&s_pkey, NULL, format,
openpgp_oid_to_curve (app->app_local->keyattr[keyno].ecc.oid),
(int)mlen, mbuf);
if (err)
goto leave;
@ -3375,7 +3379,7 @@ ecc_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
goto leave;
oidbuf = gcry_mpi_get_opaque (oid, &n);
oid_len = n;
oid_len = (n+7)/8;
if (!oidbuf)
{
err = gpg_error_from_syserror ();
@ -3383,8 +3387,8 @@ ecc_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
goto leave;
}
err = store_fpr (app, keyno, created_at, fprbuf, algo,
oidbuf, oid_len, ecc_q, ecc_q_len,
"\x03\x01\x08\x07", (size_t)4);
oidbuf, oid_len, ecc_q, ecc_q_len,
"\x03\x01\x08\x07", (size_t)4);
gcry_mpi_release (oid);
}
@ -4362,16 +4366,32 @@ parse_historical (struct app_local_s *apploc,
}
/*
* Check if the OID in an DER encoding is available by GnuPG/libgcrypt,
* and return the constant string in dotted decimal form.
* Return NULL if not available.
* The constant string is not allocated dynamically, never free it.
*/
static const char *
ecc_oid (unsigned char *buf, size_t buflen)
{
gcry_mpi_t oid;
char *oidstr;
const char *result;
unsigned char *oidbuf;
oidbuf = xtrymalloc (buflen + 1);
if (!oidbuf)
return NULL;
memcpy (oidbuf+1, buf, buflen);
oidbuf[0] = buflen;
oid = gcry_mpi_set_opaque (NULL, buf, buflen * 8);
if (!oid)
return NULL;
{
xfree (oidbuf);
return NULL;
}
oidstr = openpgp_oid_to_str (oid);
gcry_mpi_release (oid);
@ -4441,13 +4461,20 @@ parse_algorithm_attribute (app_t app, int keyno)
else if (*buffer == PUBKEY_ALGO_ECDH || *buffer == PUBKEY_ALGO_ECDSA
|| *buffer == PUBKEY_ALGO_EDDSA)
{
app->app_local->keyattr[keyno].key_type = KEY_TYPE_ECC;
app->app_local->keyattr[keyno].ecc.oid = ecc_oid (buffer + 1, buflen - 1);
app->app_local->keyattr[keyno].ecc.flags = (*buffer == PUBKEY_ALGO_EDDSA);
if (opt.verbose)
log_printf
("ECC, curve=%s%s\n", app->app_local->keyattr[keyno].ecc.oid,
app->app_local->keyattr[keyno].ecc.flags ? " (eddsa)": "");
const char *oid = ecc_oid (buffer + 1, buflen - 1);
if (!oid)
log_printhex ("Curve with OID not supported: ", buffer+1, buflen-1);
else
{
app->app_local->keyattr[keyno].key_type = KEY_TYPE_ECC;
app->app_local->keyattr[keyno].ecc.oid = oid;
app->app_local->keyattr[keyno].ecc.flags = (*buffer == PUBKEY_ALGO_EDDSA);
if (opt.verbose)
log_printf
("ECC, curve=%s%s\n", app->app_local->keyattr[keyno].ecc.oid,
app->app_local->keyattr[keyno].ecc.flags ? " (eddsa)": "");
}
}
else if (opt.verbose)
log_printhex ("", buffer, buflen);