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/*
Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef __METADATA_H__
#define __METADATA_H__
#define NMTD_8_MAC_SIZE (8)
#define EMTD_8_MAC_SIZE (8)
typedef uint8_t nmtd_8_mac_t[NMTD_8_MAC_SIZE];
typedef uint8_t emtd_8_mac_t[EMTD_8_MAC_SIZE];
/*
* Version "v1" of file's metadata.
* Metadata of this version has 4 components:
*
* 1) EMTD (Encrypted part of MeTaData);
* 2) NMTD (Non-encrypted part of MeTaData);
* 3) EMTD_MAC; (EMTD Message Authentication Code);
* 4) Array of per-link NMTD MACs (for every (hard)link it includes
* exactly one MAC)
*/
struct mtd_format_v1 {
/* EMTD, encrypted part of meta-data */
uint8_t alg_id; /* cipher algorithm id (only AES for now) */
uint8_t mode_id; /* cipher mode id; (only XTS for now) */
uint8_t block_bits; /* encoded block size */
uint8_t minor_id; /* client translator id */
uint8_t dkey_factor; /* encoded size of the data key */
/* MACs */
emtd_8_mac_t gmac; /* MAC of the encrypted meta-data, 8 bytes */
nmtd_8_mac_t omac; /* per-link MACs of the non-encrypted
* meta-data: at least one such MAC is always
* present */
} __attribute__((packed));
/*
* NMTD, the non-encrypted part of metadata of version "v1"
* is file's gfid, which is generated on trusted machines.
*/
#define SIZE_OF_NMTD_V1 (sizeof(uuid_t))
#define SIZE_OF_EMTD_V1 \
(offsetof(struct mtd_format_v1, gmac) - \
offsetof(struct mtd_format_v1, alg_id))
#define SIZE_OF_NMTD_V1_MAC (NMTD_8_MAC_SIZE)
#define SIZE_OF_EMTD_V1_MAC (EMTD_8_MAC_SIZE)
static inline unsigned char *
get_EMTD_V1(struct mtd_format_v1 *format)
{
return &format->alg_id;
}
static inline unsigned char *
get_NMTD_V1(struct crypt_inode_info *info)
{
return info->oid;
}
static inline unsigned char *
get_EMTD_V1_MAC(struct mtd_format_v1 *format)
{
return format->gmac;
}
static inline unsigned char *
get_NMTD_V1_MAC(struct mtd_format_v1 *format)
{
return format->omac;
}
#endif /* __METADATA_H__ */
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