mirror of git://git.gnupg.org/gnupg.git
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* card-misc.c - Helper functions for gpg-card
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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 "gpg-card.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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/* Direct sending of an hex encoded APDU with error printing. This is
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* a simple wrapper around scd_apdu. */
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gpg_error_t
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send_apdu (const char *hexapdu, const char *desc, unsigned int ignore,
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unsigned char **r_data, size_t *r_datalen)
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{
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gpg_error_t err;
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unsigned int sw;
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err = scd_apdu (hexapdu, NULL, &sw, r_data, r_datalen);
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if (err)
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log_error ("sending card command %s failed: %s\n", desc,
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gpg_strerror (err));
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else if (!hexapdu
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|| !strcmp (hexapdu, "undefined")
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|| !strcmp (hexapdu, "reset-keep-lock")
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|| !strcmp (hexapdu, "lock")
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|| !strcmp (hexapdu, "trylock")
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|| !strcmp (hexapdu, "unlock"))
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; /* Ignore pseudo APDUs. */
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else if (ignore == 0xffff)
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; /* Ignore all status words. */
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else if (sw != 0x9000)
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{
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switch (sw)
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{
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case 0x6285: err = gpg_error (GPG_ERR_OBJ_TERM_STATE); break;
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case 0x6982: err = gpg_error (GPG_ERR_BAD_PIN); break;
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case 0x6985: err = gpg_error (GPG_ERR_USE_CONDITIONS); break;
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default: err = gpg_error (GPG_ERR_CARD);
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}
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if (!(ignore && ignore == sw))
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log_error ("card command %s failed: %s (0x%04x)\n", desc,
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gpg_strerror (err), sw);
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}
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return err;
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}
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