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scd,openpgp: Switch key attributes between RSA and ECC in writekey.

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* common/sexputil.c (get_rsa_pk_from_canon_sexp): Also allow private
keys.
(pubkey_algo_string): Ditto.
* scd/app-openpgp.c (do_writekey): Switch key attributes
--

The scd WRITEKEY command for OpenPGP cards missed proper support to
aautomagically switch key attributes based on the new key.  We had
this only in GENKEY.

GnuPG-bug-id: 6378
This commit is contained in:
Werner Koch 2023-03-14 16:16:40 +01:00
parent 6d792ae2eb
commit 2e065b4bd2
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 34 additions and 6 deletions
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5
common/sexputil.c
View File

@ -536,7 +536,8 @@ get_rsa_pk_from_canon_sexp (const unsigned char *keydata, size_t keydatalen,
return err;
if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
return err;
if (!tok || toklen != 10 || memcmp ("public-key", tok, toklen))
if (!tok || !((toklen == 10 && !memcmp ("public-key", tok, toklen))
|| (toklen == 11 && !memcmp ("private-key", tok, toklen))))
return gpg_error (GPG_ERR_BAD_PUBKEY);
if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
return err;
@ -1074,6 +1075,8 @@ pubkey_algo_string (gcry_sexp_t s_pkey, enum gcry_pk_algos *r_algoid)
*r_algoid = 0;
l1 = gcry_sexp_find_token (s_pkey, "public-key", 0);
if (!l1)
l1 = gcry_sexp_find_token (s_pkey, "private-key", 0);
if (!l1)
return xtrystrdup ("E_no_key");
{

35
scd/app-openpgp.c
View File

@ -4824,6 +4824,7 @@ do_writekey (app_t app, ctrl_t ctrl,
const unsigned char *buf, *tok;
size_t buflen, toklen;
int depth;
char *algostr = NULL;
(void)ctrl;
@ -4866,17 +4867,41 @@ do_writekey (app_t app, ctrl_t ctrl,
goto leave;
if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
goto leave;
if (tok && toklen == 3 && memcmp ("rsa", tok, toklen) == 0)
err = rsa_writekey (app, ctrl, pincb, pincb_arg, keyno, buf, buflen, depth);
else if (tok && toklen == 3 && memcmp ("ecc", tok, toklen) == 0)
err = ecc_writekey (app, ctrl, pincb, pincb_arg, keyno, buf, buflen, depth);
if (tok && toklen == 3 && (!memcmp ("rsa", tok, toklen)
|| !memcmp ("ecc", tok, toklen)))
{
gcry_sexp_t stmp;
if (!gcry_sexp_new (&stmp, keydata, keydatalen, 0))
algostr = pubkey_algo_string (stmp, NULL);
else
algostr = NULL;
gcry_sexp_release (stmp);
if (app->app_local->keyattr[keyno].keyalgo && algostr
&& strcmp (app->app_local->keyattr[keyno].keyalgo, algostr))
{
log_info ("openpgp: changing key attribute from %s to %s\n",
app->app_local->keyattr[keyno].keyalgo, algostr);
err = change_keyattr_from_string (app, ctrl, pincb, pincb_arg,
keyid, algostr, NULL, 0);
if (err)
return err;
}
if (*tok == 'r')
err = rsa_writekey (app, ctrl, pincb, pincb_arg, keyno,
buf,buflen,depth);
else
err = ecc_writekey (app, ctrl, pincb, pincb_arg, keyno,
buf, buflen, depth);
}
else
{
err = gpg_error (GPG_ERR_WRONG_PUBKEY_ALGO);
goto leave;
}
leave:
xfree (algostr);
return err;
}