Crypt and Verity device status

Enumerations
enum	crypt_status_info { CRYPT_INVALID , CRYPT_INACTIVE , CRYPT_ACTIVE , CRYPT_BUSY }

Functions
crypt_status_info	crypt_status (struct crypt_device *cd, const char *name)
int	crypt_dump (struct crypt_device *cd)
int	crypt_dump_json (struct crypt_device *cd, const char **json, uint32_t flags)
const char *	crypt_get_cipher (struct crypt_device *cd)
const char *	crypt_get_cipher_mode (struct crypt_device *cd)
const char *	crypt_get_uuid (struct crypt_device *cd)
const char *	crypt_get_device_name (struct crypt_device *cd)
const char *	crypt_get_metadata_device_name (struct crypt_device *cd)
uint64_t	crypt_get_data_offset (struct crypt_device *cd)
uint64_t	crypt_get_iv_offset (struct crypt_device *cd)
int	crypt_get_volume_key_size (struct crypt_device *cd)
int	crypt_get_sector_size (struct crypt_device *cd)
int	crypt_header_is_detached (struct crypt_device *cd)
int	crypt_get_verity_info (struct crypt_device *cd, struct crypt_params_verity *vp)
int	crypt_get_integrity_info (struct crypt_device *cd, struct crypt_params_integrity *ip)

Detailed Description

Enumeration Type Documentation

crypt_status_info

enum crypt_status_info

Device status

Enumerator
CRYPT_INVALID	device mapping is invalid in this context
CRYPT_INACTIVE	no such mapped device
CRYPT_ACTIVE	device is active
CRYPT_BUSY	device is active and has open count > 0

Function Documentation

crypt_dump()

int crypt_dump

(

struct crypt_device *

cd

)

Dump text-formatted information about crypt or verity device to log output.

Parameters

cd	crypt device handle

Returns

0 on success or negative errno value otherwise.

crypt_dump_json()

int crypt_dump_json	(	struct crypt_device *	cd,
		const char **	json,
		uint32_t	flags
	)

Dump JSON-formatted information about LUKS2 device

Parameters

cd	crypt device handle (only LUKS2 format supported)
json	buffer with JSON, if NULL use log callback for output
flags	dump flags (reserved)

Returns

0 on success or negative errno value otherwise.

crypt_get_cipher()

const char * crypt_get_cipher

(

struct crypt_device *

cd

)

Get cipher used in device.

Parameters

cd	crypt device handle

Returns

used cipher, e.g. "aes" or NULL otherwise

Examples

crypt_luks_usage.c.

crypt_get_cipher_mode()

const char * crypt_get_cipher_mode

(

struct crypt_device *

cd

)

Get cipher mode used in device.

Parameters

cd	crypt device handle

Returns

used cipher mode e.g. "xts-plain" or otherwise

Examples

crypt_luks_usage.c.

crypt_get_data_offset()

uint64_t crypt_get_data_offset

(

struct crypt_device *

cd

)

Get device offset in 512-bytes sectors where real data starts (on underlying device).

Parameters

cd	crypt device handle

Returns

device offset in sectors

crypt_get_device_name()

const char * crypt_get_device_name

(

struct crypt_device *

cd

)

Get path to underlying device.

Parameters

cd	crypt device handle

Returns

path to underlying device name

Examples

crypt_luks_usage.c.

crypt_get_integrity_info()

int crypt_get_integrity_info	(	struct crypt_device *	cd,
		struct crypt_params_integrity *	ip
	)

Get device parameters for INTEGRITY device.

Parameters

cd	crypt device handle
ip	verity device info

0 on success or negative errno value otherwise.

crypt_get_iv_offset()

uint64_t crypt_get_iv_offset

(

struct crypt_device *

cd

)

Get IV offset in 512-bytes sectors (skip).

Parameters

cd	crypt device handle

Returns

IV offset

crypt_get_metadata_device_name()

const char * crypt_get_metadata_device_name

(

struct crypt_device *

cd

)

Get path to detached metadata device or NULL if it is not detached.

Parameters

cd	crypt device handle

Returns

path to underlying device name

crypt_get_sector_size()

int crypt_get_sector_size

(

struct crypt_device *

cd

)

Get size (in bytes) of encryption sector for crypt device.

Parameters

cd	crypt device handle

Returns

sector size

crypt_get_uuid()

const char * crypt_get_uuid

(

struct crypt_device *

cd

)

Get device UUID.

Parameters

cd	crypt device handle

Returns

device UUID or NULL if not set

Examples

crypt_luks_usage.c.

crypt_get_verity_info()

int crypt_get_verity_info	(	struct crypt_device *	cd,
		struct crypt_params_verity *	vp
	)

Get device parameters for VERITY device.

Parameters

cd	crypt device handle
vp	verity device info

0 on success or negative errno value otherwise.

crypt_get_volume_key_size()

int crypt_get_volume_key_size

(

struct crypt_device *

cd

)

Get size (in bytes) of volume key for crypt device.

Parameters

cd	crypt device handle

Returns

volume key size

Note

For LUKS2, this function can be used only if there is at least one keyslot assigned to data segment.

crypt_header_is_detached()

int crypt_header_is_detached

(

struct crypt_device *

cd

)

Check if initialized LUKS context uses detached header (LUKS header located on a different device than data.)

Parameters

cd	crypt device handle

Returns

1 if detached header is used, 0 if not or negative errno value otherwise.

Note

This is a runtime attribute, it does not say if a LUKS device requires detached header. This function works only with LUKS devices.

crypt_status()

crypt_status_info crypt_status	(	struct crypt_device *	cd,
		const char *	name
	)

Get status info about device name.

Parameters

cd	crypt device handle, can be NULL
name	crypt device name

Returns

value defined by crypt_status_info.

Examples

crypt_luks_usage.c.