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/* card-tool-misc.c - Helper functions for gpg-card-tool
* Copyright (C) 2019 g10 Code GmbH
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "../common/util.h"
#include "../common/i18n.h"
#include "../common/openpgpdefs.h"
#include "card-tool.h"
/* Return the key info object for the key KEYREF. If it is not found
* NULL is returned. */
key_info_t
find_kinfo (card_info_t info, const char *keyref)
{
key_info_t kinfo;
for (kinfo = info->kinfo; kinfo; kinfo = kinfo->next)
if (!strcmp (kinfo->keyref, keyref))
return kinfo;
return NULL;
}
/* Convert STRING into a newly allocated buffer while translating the
* hex numbers. Blanks and colons are allowed to separate pairs of
* hex digits. Returns NULL on error or a newly malloced buffer and
* its length in LENGTH. */
void *
hex_to_buffer (const char *string, size_t *r_length)
{
unsigned char *buffer;
const char *s;
size_t n;
buffer = xtrymalloc (strlen (string)+1);
if (!buffer)
return NULL;
for (s=string, n=0; *s; s++)
{
if (ascii_isspace (*s) || *s == ':')
continue;
if (hexdigitp (s) && hexdigitp (s+1))
{
buffer[n++] = xtoi_2 (s);
s++;
}
else
{
xfree (buffer);
gpg_err_set_errno (EINVAL);
return NULL;
}
}
*r_length = n;
return buffer;
}
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