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/*
* Generic wrapper for storage functions
* (experimental only)
*
* Copyright (C) 2018-2021, Ondrej Kozina
*
* This file is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This file 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _UTILS_STORAGE_WRAPPERS_H
#define _UTILS_STORAGE_WRAPPERS_H
#include <stdint.h>
#include <sys/types.h>
struct crypt_storage_wrapper;
struct device;
struct volume_key;
struct crypt_device;
#define DISABLE_USPACE (1 << 0)
#define DISABLE_KCAPI (1 << 1)
#define DISABLE_DMCRYPT (1 << 2)
#define OPEN_READONLY (1 << 3)
#define LARGE_IV (1 << 4)
typedef enum {
NONE = 0,
USPACE,
DMCRYPT
} crypt_storage_wrapper_type;
int crypt_storage_wrapper_init(struct crypt_device *cd,
struct crypt_storage_wrapper **cw,
struct device *device,
uint64_t data_offset,
uint64_t iv_start,
int sector_size,
const char *cipher,
struct volume_key *vk,
uint32_t flags);
void crypt_storage_wrapper_destroy(struct crypt_storage_wrapper *cw);
/* !!! when doing 'read' or 'write' all offset values are RELATIVE to data_offset !!! */
ssize_t crypt_storage_wrapper_read(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
ssize_t crypt_storage_wrapper_read_decrypt(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
ssize_t crypt_storage_wrapper_decrypt(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
ssize_t crypt_storage_wrapper_write(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
ssize_t crypt_storage_wrapper_encrypt_write(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
ssize_t crypt_storage_wrapper_encrypt(struct crypt_storage_wrapper *cw,
off_t offset, void *buffer, size_t buffer_length);
int crypt_storage_wrapper_datasync(const struct crypt_storage_wrapper *cw);
crypt_storage_wrapper_type crypt_storage_wrapper_get_type(const struct crypt_storage_wrapper *cw);
#endif
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