/*
 * utils_crypt - cipher utilities for cryptsetup
 *
 * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
 * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
 * Copyright (C) 2009-2012, Milan Broz
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _UTILS_CRYPT_H
#define _UTILS_CRYPT_H

#include <unistd.h>

#define MAX_CIPHER_LEN		32
#define MAX_CIPHER_LEN_STR	"31"
#define MAX_KEYFILES		32

struct crypt_device;

int crypt_parse_name_and_mode(const char *s, char *cipher,
			      int *key_nums, char *cipher_mode);

int crypt_get_key(const char *prompt,
		  char **key, size_t *key_size,
		  size_t keyfile_offset, size_t keyfile_size_max,
		  const char *key_file,
		  int timeout, int verify,
		  struct crypt_device *cd);

void *crypt_safe_alloc(size_t size);
void crypt_safe_free(void *data);
void *crypt_safe_realloc(void *data, size_t size);

void crypt_memzero(void *s, size_t n);

ssize_t crypt_hex_to_bytes(const char *hex, char **result, int safe_alloc);

#endif /* _UTILS_CRYPT_H */
