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card: Print the used algorithm of all keys.

Browse source 
* tools/card-call-scd.c (scd_readkey): New.
* tools/card-tool-misc.c (pubkey_algo_string): New.
* tools/gpg-card-tool.c (list_one_kinfo): Print the algo.
--

It is convenient to see the actual algorithm of keys even if no
certificate has yet been created.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-02-07 20:28:43 +01:00
parent df6ba6dfd2
commit b79bc877f2
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
4 changed files with 108 additions and 0 deletions
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58
tools/card-tool-misc.c
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@ -77,3 +77,61 @@ hex_to_buffer (const char *string, size_t *r_length)
*r_length = n;
return buffer;
}
/* Given the public key S_PKEY, return a new buffer with a descriptive
* string for its algorithm. This function always returns a string. */
char *
pubkey_algo_string (gcry_sexp_t s_pkey)
{
const char *prefix;
gcry_sexp_t l1;
char *algoname;
int algo;
char *result;
l1 = gcry_sexp_find_token (s_pkey, "public-key", 0);
if (!l1)
return xstrdup ("E_no_key");
{
gcry_sexp_t l_tmp = gcry_sexp_cadr (l1);
gcry_sexp_release (l1);
l1 = l_tmp;
}
algoname = gcry_sexp_nth_string (l1, 0);
gcry_sexp_release (l1);
if (!algoname)
return xstrdup ("E_no_algo");
algo = gcry_pk_map_name (algoname);
switch (algo)
{
case GCRY_PK_RSA: prefix = "rsa"; break;
case GCRY_PK_ELG: prefix = "elg"; break;
case GCRY_PK_DSA: prefix = "dsa"; break;
case GCRY_PK_ECC: prefix = ""; break;
default: prefix = NULL; break;
}
if (prefix && *prefix)
result = xasprintf ("%s%u", prefix, gcry_pk_get_nbits (s_pkey));
else if (prefix)
{
const char *curve = gcry_pk_get_curve (s_pkey, 0, NULL);
const char *name = openpgp_oid_to_curve
(openpgp_curve_to_oid (curve, NULL), 0);
if (name)
result = xstrdup (name);
else if (curve)
result = xasprintf ("X_%s", curve);
else
result = xstrdup ("E_unknown");
}
else
result = xasprintf ("X_algo_%d", algo);
xfree (algoname);
return result;
}