mirror of git://git.gnupg.org/gnupg.git
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* card-tool-misc.c - Helper functions for gpg-card-tool
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* Copyright (C) 2019 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "../common/util.h"
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#include "../common/i18n.h"
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#include "../common/openpgpdefs.h"
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#include "card-tool.h"
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/* Return the key info object for the key KEYREF. If it is not found
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* NULL is returned. */
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key_info_t
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find_kinfo (card_info_t info, const char *keyref)
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{
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key_info_t kinfo;
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for (kinfo = info->kinfo; kinfo; kinfo = kinfo->next)
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if (!strcmp (kinfo->keyref, keyref))
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return kinfo;
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return NULL;
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}
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/* Convert STRING into a newly allocated buffer while translating the
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* hex numbers. Blanks and colons are allowed to separate pairs of
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* hex digits. Returns NULL on error or a newly malloced buffer and
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* its length in LENGTH. */
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void *
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hex_to_buffer (const char *string, size_t *r_length)
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{
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unsigned char *buffer;
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const char *s;
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size_t n;
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buffer = xtrymalloc (strlen (string)+1);
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if (!buffer)
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return NULL;
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for (s=string, n=0; *s; s++)
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{
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if (ascii_isspace (*s) || *s == ':')
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continue;
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if (hexdigitp (s) && hexdigitp (s+1))
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{
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buffer[n++] = xtoi_2 (s);
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s++;
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}
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else
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{
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xfree (buffer);
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gpg_err_set_errno (EINVAL);
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return NULL;
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}
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}
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*r_length = n;
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return buffer;
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}
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/* Given the public key S_PKEY, return a new buffer with a descriptive
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* string for its algorithm. This function always returns a string. */
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char *
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pubkey_algo_string (gcry_sexp_t s_pkey)
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{
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const char *prefix;
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gcry_sexp_t l1;
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char *algoname;
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int algo;
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char *result;
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l1 = gcry_sexp_find_token (s_pkey, "public-key", 0);
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if (!l1)
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return xstrdup ("E_no_key");
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{
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gcry_sexp_t l_tmp = gcry_sexp_cadr (l1);
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gcry_sexp_release (l1);
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l1 = l_tmp;
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}
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algoname = gcry_sexp_nth_string (l1, 0);
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gcry_sexp_release (l1);
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if (!algoname)
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return xstrdup ("E_no_algo");
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algo = gcry_pk_map_name (algoname);
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switch (algo)
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{
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case GCRY_PK_RSA: prefix = "rsa"; break;
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case GCRY_PK_ELG: prefix = "elg"; break;
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case GCRY_PK_DSA: prefix = "dsa"; break;
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case GCRY_PK_ECC: prefix = ""; break;
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default: prefix = NULL; break;
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}
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if (prefix && *prefix)
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result = xasprintf ("%s%u", prefix, gcry_pk_get_nbits (s_pkey));
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else if (prefix)
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{
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const char *curve = gcry_pk_get_curve (s_pkey, 0, NULL);
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const char *name = openpgp_oid_to_curve
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(openpgp_curve_to_oid (curve, NULL), 0);
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if (name)
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result = xstrdup (name);
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else if (curve)
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result = xasprintf ("X_%s", curve);
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else
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result = xstrdup ("E_unknown");
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}
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else
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result = xasprintf ("X_algo_%d", algo);
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xfree (algoname);
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return result;
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}
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