/*
* libcryptsetup - cryptsetup library
*
* Copyright (C) 2004 Jana Saout <jana@saout.de>
* Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2020 Red Hat, Inc. All rights reserved.
* Copyright (C) 2009-2020 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.
*/
/**
* @file libcryptsetup.h
* @brief Public cryptsetup API
*
* For more verbose examples of LUKS related use cases,
* please read @ref index "examples".
*/
#ifndef _LIBCRYPTSETUP_H
#define _LIBCRYPTSETUP_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h>
#include <stdint.h>
/**
* @defgroup crypt-init Cryptsetup device context initialization
* Set of functions for creating and destroying @e crypt_device context
* @addtogroup crypt-init
* @{
*/
struct crypt_device; /* crypt device handle */
/**
* Initialize crypt device handle and check if the provided device exists.
*
* @param cd Returns pointer to crypt device handle
* @param device Path to the backing device.
* If @e device is not a block device but a path to some file,
* the function will try to create a loopdevice and attach
* the file to the loopdevice with AUTOCLEAR flag set.
* If @e device is @e NULL function it will initialize dm backend only.
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note Note that logging is not initialized here, possible messages use
* default log function.
*/
int crypt_init(struct crypt_device **cd, const char *device);
/**
* Initialize crypt device handle with optional data device and check
* if devices exist.
*
* @param cd Returns pointer to crypt device handle
* @param device Path to the backing device or detached header.
* @param data_device Path to the data device or @e NULL.
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note Note that logging is not initialized here, possible messages use
* default log function.
*/
int crypt_init_data_device(struct crypt_device **cd,
const char *device,
const char *data_device);
/**
* Initialize crypt device handle from provided active device name,
* and, optionally, from separate metadata (header) device
* and check if provided device exists.
*
* @return @e 0 on success or negative errno value otherwise.
*
* @param cd returns crypt device handle for active device
* @param name name of active crypt device
* @param header_device optional device containing on-disk header
* (@e NULL if it the same as underlying device on there is no on-disk header)
*
* @post In case @e device points to active LUKS device but header load fails,
* context device type is set to @e NULL and @e 0 is returned as if it were successful.
* Context with @e NULL device type can only be deactivated by crypt_deactivate
*
* @note @link crypt_init_by_name @endlink is equivalent to calling
* crypt_init_by_name_and_header(cd, name, NULL);
*/
int crypt_init_by_name_and_header(struct crypt_device **cd,
const char *name,
const char *header_device);
/**
* This is equivalent to call
* @ref crypt_init_by_name_and_header "crypt_init_by_name_and_header(cd, name, NULL)"
*
* @sa crypt_init_by_name_and_header
*/
int crypt_init_by_name(struct crypt_device **cd, const char *name);
/**
* Release crypt device context and used memory.
*
* @param cd crypt device handle
*/
void crypt_free(struct crypt_device *cd);
/**
* Set confirmation callback (yes/no).
*
* If code need confirmation (like resetting uuid or restoring LUKS header from file)
* this function is called. If not defined, everything is confirmed.
*
* Callback function @e confirm should return @e 0 if operation is declined,
* other values mean accepted.
*
* @param cd crypt device handle
* @param confirm user defined confirm callback reference
* @param usrptr provided identification in callback
* @param msg Message for user to confirm
*
* @note Current version of cryptsetup API requires confirmation for UUID change and
* LUKS header restore only.
*/
void crypt_set_confirm_callback(struct crypt_device *cd,
int (*confirm)(const char *msg, void *usrptr),
void *usrptr);
/**
* Set data device
* For LUKS it is encrypted data device when LUKS header is separated.
* For VERITY it is data device when hash device is separated.
*
* @param cd crypt device handle
* @param device path to device
*
* @returns 0 on success or negative errno value otherwise.
*/
int crypt_set_data_device(struct crypt_device *cd, const char *device);
/**
* Set data device offset in 512-byte sectors.
* Used for LUKS.
* This function is replacement for data alignment fields in LUKS param struct.
* If set to 0 (default), old behaviour is preserved.
* This value is reset on @link crypt_load @endlink.
*
* @param cd crypt device handle
* @param data_offset data offset in bytes
*
* @returns 0 on success or negative errno value otherwise.
*
* @note Data offset must be aligned to multiple of 8 (alignment to 4096-byte sectors)
* and must be big enough to accommodate the whole LUKS header with all keyslots.
* @note Data offset is enforced by this function, device topology
* information is no longer used after calling this function.
*/
int crypt_set_data_offset(struct crypt_device *cd, uint64_t data_offset);
/** @} */
/**
* @defgroup crypt-log Cryptsetup logging
* Set of functions and defines used in cryptsetup for
* logging purposes
* @addtogroup crypt-log
* @{
*/
/** normal log level */
#define CRYPT_LOG_NORMAL 0
/** error log level */
#define CRYPT_LOG_ERROR 1
/** verbose log level */
#define CRYPT_LOG_VERBOSE 2
/** debug log level - always on stdout */
#define CRYPT_LOG_DEBUG -1
/** debug log level - additional JSON output (for LUKS2) */
#define CRYPT_LOG_DEBUG_JSON -2
/**
* Set log function.
*
* @param cd crypt device handle (can be @e NULL to set default log function)
* @param log user defined log function reference
* @param usrptr provided identification in callback
* @param level log level below (debug messages can uses other levels)
* @param msg log message
*/
void crypt_set_log_callback(struct crypt_device *cd,
void (*log)(int level, const char *msg, void *usrptr),
void *usrptr);
/**
* Defines log function or use the default one otherwise.
*
* @see crypt_set_log_callback
*
* @param cd crypt device handle
* @param level log level
* @param msg log message
*/
void crypt_log(struct crypt_device *cd, int level, const char *msg);
/** @} */
/**
* @defgroup crypt-set Cryptsetup settings (RNG, PBKDF, locking)
* @addtogroup crypt-set
* @{
*/
/** CRYPT_RNG_URANDOM - use /dev/urandom */
#define CRYPT_RNG_URANDOM 0
/** CRYPT_RNG_RANDOM - use /dev/random (waits if no entropy in system) */
#define CRYPT_RNG_RANDOM 1
/**
* Set which RNG (random number generator) is used for generating long term key
*
* @param cd crypt device handle
* @param rng_type kernel random number generator to use
*
*/
void crypt_set_rng_type(struct crypt_device *cd, int rng_type);
/**
* Get which RNG (random number generator) is used for generating long term key.
*
* @param cd crypt device handle
* @return RNG type on success or negative errno value otherwise.
*
*/
int crypt_get_rng_type(struct crypt_device *cd);
/**
* PBKDF parameters.
*/
struct crypt_pbkdf_type {
const char *type; /**< PBKDF algorithm */
const char *hash; /**< Hash algorithm */
uint32_t time_ms; /**< Requested time cost [milliseconds] */
uint32_t iterations; /**< Iterations, 0 or benchmarked value. */
uint32_t max_memory_kb; /**< Requested or benchmarked memory cost [kilobytes] */
uint32_t parallel_threads;/**< Requested parallel cost [threads] */
uint32_t flags; /**< CRYPT_PBKDF* flags */
};
/** Iteration time set by crypt_set_iteration_time(), for compatibility only. */
#define CRYPT_PBKDF_ITER_TIME_SET (1 << 0)
/** Never run benchmarks, use pre-set value or defaults. */
#define CRYPT_PBKDF_NO_BENCHMARK (1 << 1)
/** PBKDF2 according to RFC2898, LUKS1 legacy */
#define CRYPT_KDF_PBKDF2 "pbkdf2"
/** Argon2i according to RFC */
#define CRYPT_KDF_ARGON2I "argon2i"
/** Argon2id according to RFC */
#define CRYPT_KDF_ARGON2ID "argon2id"
/**
* Set default PBKDF (Password-Based Key Derivation Algorithm) for next keyslot
* about to get created with any crypt_keyslot_add_*() call.
*
* @param cd crypt device handle
* @param pbkdf PBKDF parameters
*
* @return 0 on success or negative errno value otherwise.
*
* @note For LUKS1, only PBKDF2 is supported, other settings will be rejected.
* @note For non-LUKS context types the call succeeds, but PBKDF is not used.
*/
int crypt_set_pbkdf_type(struct crypt_device *cd,
const struct crypt_pbkdf_type *pbkdf);
/**
* Get PBKDF (Password-Based Key Derivation Algorithm) parameters.
*
* @param pbkdf_type type of PBKDF
*
* @return struct on success or NULL value otherwise.
*
*/
const struct crypt_pbkdf_type *crypt_get_pbkdf_type_params(const char *pbkdf_type);
/**
* Get default PBKDF (Password-Based Key Derivation Algorithm) settings for keyslots.
* Works only with LUKS device handles (both versions).
*
* @param type type of device (see @link crypt-type @endlink)
*
* @return struct on success or NULL value otherwise.
*
*/
const struct crypt_pbkdf_type *crypt_get_pbkdf_default(const char *type);
/**
* Get current PBKDF (Password-Based Key Derivation Algorithm) settings for keyslots.
* Works only with LUKS device handles (both versions).
*
* @param cd crypt device handle
*
* @return struct on success or NULL value otherwise.
*
*/
const struct crypt_pbkdf_type *crypt_get_pbkdf_type(struct crypt_device *cd);
/**
* Set how long should cryptsetup iterate in PBKDF2 function.
* Default value heads towards the iterations which takes around 1 second.
* \b Deprecated, only for backward compatibility.
* Use @link crypt_set_pbkdf_type @endlink.
*
* @param cd crypt device handle
* @param iteration_time_ms the time in ms
*
* @note If the time value is not acceptable for active PBKDF, value is quietly ignored.
*/
void crypt_set_iteration_time(struct crypt_device *cd, uint64_t iteration_time_ms);
/**
* Helper to lock/unlock memory to avoid swap sensitive data to disk.
*
* @param cd crypt device handle, can be @e NULL
* @param lock 0 to unlock otherwise lock memory
*
* @returns Value indicating whether the memory is locked (function can be called multiple times).
*
* @note Only root can do this.
* @note It locks/unlocks all process memory, not only crypt context.
*/
int crypt_memory_lock(struct crypt_device *cd, int lock);
/**
* Set global lock protection for on-disk metadata (file-based locking).
*
* @param cd crypt device handle, can be @e NULL
* @param enable 0 to disable locking otherwise enable it (default)
*
* @returns @e 0 on success or negative errno value otherwise.
*
* @note Locking applied only for some metadata formats (LUKS2).
* @note The switch is global on the library level.
* In current version locking can be only switched off and cannot be switched on later.
*/
int crypt_metadata_locking(struct crypt_device *cd, int enable);
/**
* Set metadata header area sizes. This applies only to LUKS2.
* These values limit amount of metadata anf number of supportable keyslots.
*
* @param cd crypt device handle, can be @e NULL
* @param metadata_size size in bytes of JSON area + 4k binary header
* @param keyslots_size size in bytes of binary keyslots area
*
* @returns @e 0 on success or negative errno value otherwise.
*
* @note The metadata area is stored twice and both copies contain 4k binary header.
* Only 16,32,64,128,256,512,1024,2048 and 4096 kB value is allowed (see LUKS2 specification).
* @note Keyslots area size must be multiple of 4k with maximum 128MB.
*/
int crypt_set_metadata_size(struct crypt_device *cd,
uint64_t metadata_size,
uint64_t keyslots_size);
/**
* Get metadata header area sizes. This applies only to LUKS2.
* These values limit amount of metadata anf number of supportable keyslots.
*
* @param cd crypt device handle
* @param metadata_size size in bytes of JSON area + 4k binary header
* @param keyslots_size size in bytes of binary keyslots area
*
* @returns @e 0 on success or negative errno value otherwise.
*/
int crypt_get_metadata_size(struct crypt_device *cd,
uint64_t *metadata_size,
uint64_t *keyslots_size);
/** @} */
/**
* @defgroup crypt-type Cryptsetup on-disk format types
* Set of functions, \#defines and structs related
* to on-disk format types
* @addtogroup crypt-type
* @{
*/
/** plain crypt device, no on-disk header */
#define CRYPT_PLAIN "PLAIN"
/** LUKS version 1 header on-disk */
#define CRYPT_LUKS1 "LUKS1"
/** LUKS version 2 header on-disk */
#define CRYPT_LUKS2 "LUKS2"
/** loop-AES compatibility mode */
#define CRYPT_LOOPAES "LOOPAES"
/** dm-verity mode */
#define CRYPT_VERITY "VERITY"
/** TCRYPT (TrueCrypt-compatible and VeraCrypt-compatible) mode */
#define CRYPT_TCRYPT "TCRYPT"
/** INTEGRITY dm-integrity device */
#define CRYPT_INTEGRITY "INTEGRITY"
/** BITLK (BitLocker-compatible mode) */
#define CRYPT_BITLK "BITLK"
/** LUKS any version */
#define CRYPT_LUKS NULL
/**
* Get device type
*
* @param cd crypt device handle
* @return string according to device type or @e NULL if not known.
*/
const char *crypt_get_type(struct crypt_device *cd);
/**
* Get device default LUKS type
*
* @return string according to device type (CRYPT_LUKS1 or CRYPT_LUKS2).
*/
const char *crypt_get_default_type(void);
/**
*
* Structure used as parameter for PLAIN device type.
*
* @see crypt_format
*/
struct crypt_params_plain {
const char *hash; /**< password hash function */
uint64_t offset; /**< offset in sectors */
uint64_t skip; /**< IV offset / initialization sector */
uint64_t size; /**< size of mapped device or @e 0 for autodetection */
uint32_t sector_size; /**< sector size in bytes (@e 0 means 512 for compatibility) */
};
/**
* Structure used as parameter for LUKS device type.
*
* @see crypt_format, crypt_load
*
* @note during crypt_format @e data_device attribute determines
* if the LUKS header is separated from encrypted payload device
*
*/
struct crypt_params_luks1 {
const char *hash; /**< hash used in LUKS header */
size_t data_alignment; /**< data area alignment in 512B sectors, data offset is multiple of this */
const char *data_device; /**< detached encrypted data device or @e NULL */
};
/**
*
* Structure used as parameter for loop-AES device type.
*
* @see crypt_format
*
*/
struct crypt_params_loopaes {
const char *hash; /**< key hash function */
uint64_t offset; /**< offset in sectors */
uint64_t skip; /**< IV offset / initialization sector */
};
/**
*
* Structure used as parameter for dm-verity device type.
*
* @see crypt_format, crypt_load
*
*/
struct crypt_params_verity {
const char *hash_name; /**< hash function */
const char *data_device; /**< data_device (CRYPT_VERITY_CREATE_HASH) */
const char *hash_device; /**< hash_device (output only) */
const char *fec_device; /**< fec_device (output only) */
const char *salt; /**< salt */
uint32_t salt_size; /**< salt size (in bytes) */
uint32_t hash_type; /**< in-kernel hashing type */
uint32_t data_block_size; /**< data block size (in bytes) */
uint32_t hash_block_size; /**< hash block size (in bytes) */
uint64_t data_size; /**< data area size (in data blocks) */
uint64_t hash_area_offset; /**< hash/header offset (in bytes) */
uint64_t fec_area_offset; /**< FEC/header offset (in bytes) */
uint32_t fec_roots; /**< Reed-Solomon FEC roots */
uint32_t flags; /**< CRYPT_VERITY* flags */
};
/** No on-disk header (only hashes) */
#define CRYPT_VERITY_NO_HEADER (1 << 0)
/** Verity hash in userspace before activation */
#define CRYPT_VERITY_CHECK_HASH (1 << 1)
/** Create hash - format hash device */
#define CRYPT_VERITY_CREATE_HASH (1 << 2)
/** Root hash signature required for activation */
#define CRYPT_VERITY_ROOT_HASH_SIGNATURE (1 << 3)
/**
*
* Structure used as parameter for TCRYPT device type.
*
* @see crypt_load
*
*/
struct crypt_params_tcrypt {
const char *passphrase; /**< passphrase to unlock header (input only) */
size_t passphrase_size; /**< passphrase size (input only, max length is 64) */
const char **keyfiles; /**< keyfile paths to unlock header (input only) */
unsigned int keyfiles_count;/**< keyfiles count (input only) */
const char *hash_name; /**< hash function for PBKDF */
const char *cipher; /**< cipher chain c1[-c2[-c3]] */
const char *mode; /**< cipher block mode */
size_t key_size; /**< key size in bytes (the whole chain) */
uint32_t flags; /**< CRYPT_TCRYPT* flags */
uint32_t veracrypt_pim; /**< VeraCrypt Personal Iteration Multiplier */
};
/** Include legacy modes when scanning for header */
#define CRYPT_TCRYPT_LEGACY_MODES (1 << 0)
/** Try to load hidden header (describing hidden device) */
#define CRYPT_TCRYPT_HIDDEN_HEADER (1 << 1)
/** Try to load backup header */
#define CRYPT_TCRYPT_BACKUP_HEADER (1 << 2)
/** Device contains encrypted system (with boot loader) */
#define CRYPT_TCRYPT_SYSTEM_HEADER (1 << 3)
/** Include VeraCrypt modes when scanning for header,
* all other TCRYPT flags applies as well.
* VeraCrypt device is reported as TCRYPT type.
*/
#define CRYPT_TCRYPT_VERA_MODES (1 << 4)
/**
*
* Structure used as parameter for dm-integrity device type.
*
* @see crypt_format, crypt_load
*
* @note In bitmap tracking mode, the journal is implicitly disabled.
* As an ugly workaround for compatibility, journal_watermark is overloaded
* to mean 512-bytes sectors-per-bit and journal_commit_time means bitmap flush time.
* All other journal parameters are not applied in the bitmap mode.
*/
struct crypt_params_integrity {
uint64_t journal_size; /**< size of journal in bytes */
unsigned int journal_watermark; /**< journal flush watermark in percents; in bitmap mode sectors-per-bit */
unsigned int journal_commit_time; /**< journal commit time (or bitmap flush time) in ms */
uint32_t interleave_sectors; /**< number of interleave sectors (power of two) */
uint32_t tag_size; /**< tag size per-sector in bytes */
uint32_t sector_size; /**< sector size in bytes */
uint32_t buffer_sectors; /**< number of sectors in one buffer */
const char *integrity; /**< integrity algorithm, NULL for LUKS2 */
uint32_t integrity_key_size; /**< integrity key size in bytes, info only, 0 for LUKS2 */
const char *journal_integrity; /**< journal integrity algorithm */
const char *journal_integrity_key; /**< journal integrity key, only for crypt_load */
uint32_t journal_integrity_key_size; /**< journal integrity key size in bytes, only for crypt_load */
const char *journal_crypt; /**< journal encryption algorithm */
const char *journal_crypt_key; /**< journal crypt key, only for crypt_load */
uint32_t journal_crypt_key_size; /**< journal crypt key size in bytes, only for crypt_load */
};
/**
* Structure used as parameter for LUKS2 device type.
*
* @see crypt_format, crypt_load
*
* @note during crypt_format @e data_device attribute determines
* if the LUKS2 header is separated from encrypted payload device
*
*/
struct crypt_params_luks2 {
const struct crypt_pbkdf_type *pbkdf; /**< PBKDF (and hash) parameters or @e NULL*/
const char *integrity; /**< integrity algorithm or @e NULL */
const struct crypt_params_integrity *integrity_params; /**< Data integrity parameters or @e NULL*/
size_t data_alignment; /**< data area alignment in 512B sectors, data offset is multiple of this */
const char *data_device; /**< detached encrypted data device or @e NULL */
uint32_t sector_size; /**< encryption sector size */
const char *label; /**< header label or @e NULL*/
const char *subsystem; /**< header subsystem label or @e NULL*/
};
/** @} */
/**
* @defgroup crypt-actions Cryptsetup device context actions
* Set of functions for formatting and manipulating with specific crypt_type
* @addtogroup crypt-actions
* @{
*/
/**
* Create (format) new crypt device (and possible header on-disk) but do not activate it.
*
* @pre @e cd contains initialized and not formatted device context (device type must @b not be set)
*
* @param cd crypt device handle
* @param type type of device (optional params struct must be of this type)
* @param cipher (e.g. "aes")
* @param cipher_mode including IV specification (e.g. "xts-plain")
* @param uuid requested UUID or @e NULL if it should be generated
* @param volume_key pre-generated volume key or @e NULL if it should be generated (only for LUKS)
* @param volume_key_size size of volume key in bytes.
* @param params crypt type specific parameters (see @link crypt-type @endlink)
*
* @returns @e 0 on success or negative errno value otherwise.
*
* @note Note that crypt_format does not create LUKS keyslot (any version). To create keyslot
* call any crypt_keyslot_add_* function.
* @note For VERITY @link crypt-type @endlink, only uuid parameter is used, other parameters
* are ignored and verity specific attributes are set through mandatory params option.
*/
int crypt_format(struct crypt_device *cd,
const char *type,
const char *cipher,
const char *cipher_mode,
const char *uuid,
const char *volume_key,
size_t volume_key_size,
void *params);
/**
* Set format compatibility flags.
*
* @param cd crypt device handle
* @param flags CRYPT_COMPATIBILITY_* flags
*/
void crypt_set_compatibility(struct crypt_device *cd, uint32_t flags);
/**
* Get compatibility flags.
*
* @param cd crypt device handle
*
* @returns compatibility flags
*/
uint32_t crypt_get_compatibility(struct crypt_device *cd);
/** dm-integrity device uses less effective (legacy) padding (old kernels) */
#define CRYPT_COMPAT_LEGACY_INTEGRITY_PADDING (1 << 0)
/**
* Convert to new type for already existing device.
*
* @param cd crypt device handle
* @param type type of device (optional params struct must be of this type)
* @param params crypt type specific parameters (see @link crypt-type @endlink)
*
* @returns 0 on success or negative errno value otherwise.
*
* @note Currently, only LUKS1->LUKS2 and LUKS2->LUKS1 conversions are supported.
* Not all LUKS2 devices may be converted back to LUKS1. To make such a conversion
* possible all active LUKS2 keyslots must be in LUKS1 compatible mode (i.e. pbkdf
* type must be PBKDF2) and device cannot be formatted with any authenticated
* encryption mode.
*
* @note Device must be offline for conversion. UUID change is not possible for active
* devices.
*/
int crypt_convert(struct crypt_device *cd,
const char *type,
void *params);
/**
* Set new UUID for already existing device.
*
* @param cd crypt device handle
* @param uuid requested UUID or @e NULL if it should be generated
*
* @returns 0 on success or negative errno value otherwise.
*
* @note Currently, only LUKS device type are supported
*/
int crypt_set_uuid(struct crypt_device *cd,
const char *uuid);
/**
* Set new labels (label and subsystem) for already existing device.
*
* @param cd crypt device handle
* @param label requested label or @e NULL
* @param subsystem requested subsystem label or @e NULL
*
* @returns 0 on success or negative errno value otherwise.
*
* @note Currently, only LUKS2 device type is supported
*/
int crypt_set_label(struct crypt_device *cd,
const char *label,
const char *subsystem);
/**
* Enable or disable loading of volume keys via kernel keyring. When set to
* 'enabled' library loads key in kernel keyring first and pass the key
* description to dm-crypt instead of binary key copy. If set to 'disabled'
* library fallbacks to old method of loading volume key directly in
* dm-crypt target.
*
* @param cd crypt device handle, can be @e NULL
* @param enable 0 to disable loading of volume keys via kernel keyring
* (classical method) otherwise enable it (default)
*
* @returns @e 0 on success or negative errno value otherwise.
*
* @note Currently loading of volume keys via kernel keyring is supported
* (and enabled by default) only for LUKS2 devices.
* @note The switch is global on the library level.
*/
int crypt_volume_key_keyring(struct crypt_device *cd, int enable);
/**
* Load crypt device parameters from on-disk header.
*
* @param cd crypt device handle
* @param requested_type @link crypt-type @endlink or @e NULL for all known
* @param params crypt type specific parameters (see @link crypt-type @endlink)
*
* @returns 0 on success or negative errno value otherwise.
*
* @post In case LUKS header is read successfully but payload device is too small
* error is returned and device type in context is set to @e NULL
*
* @note Note that in current version load works only for LUKS and VERITY device type.
*
*/
int crypt_load(struct crypt_device *cd,
const char *requested_type,
void *params);
/**
* Try to repair crypt device LUKS on-disk header if invalid.
*
* @param cd crypt device handle
* @param requested_type @link crypt-type @endlink or @e NULL for all known
* @param params crypt type specific parameters (see @link crypt-type @endlink)
*
* @returns 0 on success or negative errno value otherwise.
*
* @note For LUKS2 device crypt_repair bypass blkid checks and
* perform auto-recovery even though there're third party device
* signatures found by blkid probes. Currently the crypt_repair on LUKS2
* works only if exactly one header checksum does not match or exactly
* one header is missing.
*/
int crypt_repair(struct crypt_device *cd,
const char *requested_type,
void *params);
/**
* Resize crypt device.
*
* @param cd - crypt device handle
* @param name - name of device to resize
* @param new_size - new device size in sectors or @e 0 to use all of the underlying device size
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note Most notably it returns -EPERM when device was activated with volume key
* in kernel keyring and current device handle (context) doesn't have verified key
* loaded in kernel. To load volume key for already active device use any of
* @link crypt_activate_by_passphrase @endlink, @link crypt_activate_by_keyfile @endlink,
* @link crypt_activate_by_keyfile_offset @endlink, @link crypt_activate_by_volume_key @endlink,
* @link crypt_activate_by_keyring @endlink or @link crypt_activate_by_token @endlink with flag
* @e CRYPT_ACTIVATE_KEYRING_KEY raised and @e name parameter set to @e NULL.
*/
int crypt_resize(struct crypt_device *cd,
const char *name,
uint64_t new_size);
/**
* Suspend crypt device.
*
* @param cd crypt device handle, can be @e NULL
* @param name name of device to suspend
*
* @return 0 on success or negative errno value otherwise.
*
* @note Only LUKS device type is supported
*
*/
int crypt_suspend(struct crypt_device *cd,
const char *name);
/**
* Resume crypt device using passphrase.
*
*
* @param cd crypt device handle
* @param name name of device to resume
* @param keyslot requested keyslot or CRYPT_ANY_SLOT
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of @e passphrase (binary data)
*
* @return unlocked key slot number or negative errno otherwise.
*
* @note Only LUKS device type is supported
*/
int crypt_resume_by_passphrase(struct crypt_device *cd,
const char *name,
int keyslot,
const char *passphrase,
size_t passphrase_size);
/**
* Resume crypt device using key file.
*
* @param cd crypt device handle
* @param name name of device to resume
* @param keyslot requested keyslot or CRYPT_ANY_SLOT
* @param keyfile key file used to unlock volume key
* @param keyfile_size number of bytes to read from keyfile, 0 is unlimited
* @param keyfile_offset number of bytes to skip at start of keyfile
*
* @return unlocked key slot number or negative errno otherwise.
*/
int crypt_resume_by_keyfile_device_offset(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size,
uint64_t keyfile_offset);
/**
* Backward compatible crypt_resume_by_keyfile_device_offset() (with size_t offset).
*/
int crypt_resume_by_keyfile_offset(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size,
size_t keyfile_offset);
/**
* Backward compatible crypt_resume_by_keyfile_device_offset() (without offset).
*/
int crypt_resume_by_keyfile(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size);
/**
* Resume crypt device using provided volume key.
*
* @param cd crypt device handle
* @param name name of device to resume
* @param volume_key provided volume key
* @param volume_key_size size of volume_key
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_resume_by_volume_key(struct crypt_device *cd,
const char *name,
const char *volume_key,
size_t volume_key_size);
/** @} */
/**
* @defgroup crypt-keyslot LUKS keyslots
* @addtogroup crypt-keyslot
* @{
*/
/** iterate through all keyslots and find first one that fits */
#define CRYPT_ANY_SLOT -1
/**
* Add key slot using provided passphrase.
*
* @pre @e cd contains initialized and formatted LUKS device context
*
* @param cd crypt device handle
* @param keyslot requested keyslot or @e CRYPT_ANY_SLOT
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of passphrase (binary data)
* @param new_passphrase passphrase for new keyslot
* @param new_passphrase_size size of @e new_passphrase (binary data)
*
* @return allocated key slot number or negative errno otherwise.
*/
int crypt_keyslot_add_by_passphrase(struct crypt_device *cd,
int keyslot,
const char *passphrase,
size_t passphrase_size,
const char *new_passphrase,
size_t new_passphrase_size);
/**
* Change defined key slot using provided passphrase.
*
* @pre @e cd contains initialized and formatted LUKS device context
*
* @param cd crypt device handle
* @param keyslot_old old keyslot or @e CRYPT_ANY_SLOT
* @param keyslot_new new keyslot (can be the same as old)
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of passphrase (binary data)
* @param new_passphrase passphrase for new keyslot
* @param new_passphrase_size size of @e new_passphrase (binary data)
*
* @return allocated key slot number or negative errno otherwise.
*/
int crypt_keyslot_change_by_passphrase(struct crypt_device *cd,
int keyslot_old,
int keyslot_new,
const char *passphrase,
size_t passphrase_size,
const char *new_passphrase,
size_t new_passphrase_size);
/**
* Add key slot using provided key file path.
*
* @pre @e cd contains initialized and formatted LUKS device context
*
* @param cd crypt device handle
* @param keyslot requested keyslot or @e CRYPT_ANY_SLOT
* @param keyfile key file used to unlock volume key
* @param keyfile_size number of bytes to read from keyfile, @e 0 is unlimited
* @param keyfile_offset number of bytes to skip at start of keyfile
* @param new_keyfile keyfile for new keyslot
* @param new_keyfile_size number of bytes to read from @e new_keyfile, @e 0 is unlimited
* @param new_keyfile_offset number of bytes to skip at start of new_keyfile
*
* @return allocated key slot number or negative errno otherwise.
*/
int crypt_keyslot_add_by_keyfile_device_offset(struct crypt_device *cd,
int keyslot,
const char *keyfile,
size_t keyfile_size,
uint64_t keyfile_offset,
const char *new_keyfile,
size_t new_keyfile_size,
uint64_t new_keyfile_offset);
/**
* Backward compatible crypt_keyslot_add_by_keyfile_device_offset() (with size_t offset).
*/
int crypt_keyslot_add_by_keyfile_offset(struct crypt_device *cd,
int keyslot,
const char *keyfile,
size_t keyfile_size,
size_t keyfile_offset,
const char *new_keyfile,
size_t new_keyfile_size,
size_t new_keyfile_offset);
/**
* Backward compatible crypt_keyslot_add_by_keyfile_device_offset() (without offset).
*/
int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
int keyslot,
const char *keyfile,
size_t keyfile_size,
const char *new_keyfile,
size_t new_keyfile_size);
/**
* Add key slot using provided volume key.
*
* @pre @e cd contains initialized and formatted LUKS device context
*
* @param cd crypt device handle
* @param keyslot requested keyslot or CRYPT_ANY_SLOT
* @param volume_key provided volume key or @e NULL if used after crypt_format
* @param volume_key_size size of volume_key
* @param passphrase passphrase for new keyslot
* @param passphrase_size size of passphrase
*
* @return allocated key slot number or negative errno otherwise.
*/
int crypt_keyslot_add_by_volume_key(struct crypt_device *cd,
int keyslot,
const char *volume_key,
size_t volume_key_size,
const char *passphrase,
size_t passphrase_size);
/** create keyslot with volume key not associated with current dm-crypt segment */
#define CRYPT_VOLUME_KEY_NO_SEGMENT (1 << 0)
/** create keyslot with new volume key and assign it to current dm-crypt segment */
#define CRYPT_VOLUME_KEY_SET (1 << 1)
/** Assign key to first matching digest before creating new digest */
#define CRYPT_VOLUME_KEY_DIGEST_REUSE (1 << 2)
/**
* Add key slot using provided key.
*
* @pre @e cd contains initialized and formatted LUKS2 device context
*
* @param cd crypt device handle
* @param keyslot requested keyslot or CRYPT_ANY_SLOT
* @param volume_key provided volume key or @e NULL (see note below)
* @param volume_key_size size of volume_key
* @param passphrase passphrase for new keyslot
* @param passphrase_size size of passphrase
* @param flags key flags to set
*
* @return allocated key slot number or negative errno otherwise.
*
* @note in case volume_key is @e NULL following first matching rule will apply:
* @li if cd is device handle used in crypt_format() by current process, the volume
* key generated (or passed) in crypt_format() will be stored in keyslot.
* @li if CRYPT_VOLUME_KEY_NO_SEGMENT flag is raised the new volume_key will be
* generated and stored in keyslot. The keyslot will become unbound (unusable to
* dm-crypt device activation).
* @li fails with -EINVAL otherwise
*
* @warning CRYPT_VOLUME_KEY_SET flag force updates volume key. It is @b not @b reencryption!
* By doing so you will most probably destroy your ciphertext data device. It's supposed
* to be used only in wrapped keys scheme for key refresh process where real (inner) volume
* key stays untouched. It may be involed on active @e keyslot which makes the (previously
* unbound) keyslot new regular keyslot.
*/
int crypt_keyslot_add_by_key(struct crypt_device *cd,
int keyslot,
const char *volume_key,
size_t volume_key_size,
const char *passphrase,
size_t passphrase_size,
uint32_t flags);
/**
* Destroy (and disable) key slot.
*
* @pre @e cd contains initialized and formatted LUKS device context
*
* @param cd crypt device handle
* @param keyslot requested key slot to destroy
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note Note that there is no passphrase verification used.
*/
int crypt_keyslot_destroy(struct crypt_device *cd, int keyslot);
/** @} */
/**
* @defgroup crypt-aflags Device runtime attributes
* Activation flags
* @addtogroup crypt-aflags
* @{
*/
/** device is read only */
#define CRYPT_ACTIVATE_READONLY (1 << 0)
/** only reported for device without uuid */
#define CRYPT_ACTIVATE_NO_UUID (1 << 1)
/** activate even if cannot grant exclusive access (DANGEROUS) */
#define CRYPT_ACTIVATE_SHARED (1 << 2)
/** enable discards aka TRIM */
#define CRYPT_ACTIVATE_ALLOW_DISCARDS (1 << 3)
/** skip global udev rules in activation ("private device"), input only */
#define CRYPT_ACTIVATE_PRIVATE (1 << 4)
/** corruption detected (verity), output only */
#define CRYPT_ACTIVATE_CORRUPTED (1 << 5)
/** use same_cpu_crypt option for dm-crypt */
#define CRYPT_ACTIVATE_SAME_CPU_CRYPT (1 << 6)
/** use submit_from_crypt_cpus for dm-crypt */
#define CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS (1 << 7)
/** dm-verity: ignore_corruption flag - ignore corruption, log it only */
#define CRYPT_ACTIVATE_IGNORE_CORRUPTION (1 << 8)
/** dm-verity: restart_on_corruption flag - restart kernel on corruption */
#define CRYPT_ACTIVATE_RESTART_ON_CORRUPTION (1 << 9)
/** dm-verity: ignore_zero_blocks - do not verify zero blocks */
#define CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS (1 << 10)
/** key loaded in kernel keyring instead directly in dm-crypt */
#define CRYPT_ACTIVATE_KEYRING_KEY (1 << 11)
/** dm-integrity: direct writes, do not use journal */
#define CRYPT_ACTIVATE_NO_JOURNAL (1 << 12)
/** dm-integrity: recovery mode - no journal, no integrity checks */
#define CRYPT_ACTIVATE_RECOVERY (1 << 13)
/** ignore persistently stored flags */
#define CRYPT_ACTIVATE_IGNORE_PERSISTENT (1 << 14)
/** dm-verity: check_at_most_once - check data blocks only the first time */
#define CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE (1 << 15)
/** allow activation check including unbound keyslots (keyslots without segments) */
#define CRYPT_ACTIVATE_ALLOW_UNBOUND_KEY (1 << 16)
/** dm-integrity: activate automatic recalculation */
#define CRYPT_ACTIVATE_RECALCULATE (1 << 17)
/** reactivate existing and update flags, input only */
#define CRYPT_ACTIVATE_REFRESH (1 << 18)
/** Use global lock to serialize memory hard KDF on activation (OOM workaround) */
#define CRYPT_ACTIVATE_SERIALIZE_MEMORY_HARD_PBKDF (1 << 19)
/** dm-integrity: direct writes, use bitmap to track dirty sectors */
#define CRYPT_ACTIVATE_NO_JOURNAL_BITMAP (1 << 20)
/** device is suspended (key should be wiped from memory), output only */
#define CRYPT_ACTIVATE_SUSPENDED (1 << 21)
/** use IV sector counted in sector_size instead of default 512 bytes sectors */
#define CRYPT_ACTIVATE_IV_LARGE_SECTORS (1 << 22)
/**
* Active device runtime attributes
*/
struct crypt_active_device {
uint64_t offset; /**< offset in sectors */
uint64_t iv_offset; /**< IV initialization sector */
uint64_t size; /**< active device size */
uint32_t flags; /**< activation flags */
};
/**
* Receive runtime attributes of active crypt device.
*
* @param cd crypt device handle (can be @e NULL)
* @param name name of active device
* @param cad preallocated active device attributes to fill
*
* @return @e 0 on success or negative errno value otherwise
*
*/
int crypt_get_active_device(struct crypt_device *cd,
const char *name,
struct crypt_active_device *cad);
/**
* Get detected number of integrity failures.
*
* @param cd crypt device handle (can be @e NULL)
* @param name name of active device
*
* @return number of integrity failures or @e 0 otherwise
*
*/
uint64_t crypt_get_active_integrity_failures(struct crypt_device *cd,
const char *name);
/** @} */
/**
* @defgroup crypt-pflags LUKS2 Device persistent flags and requirements
* @addtogroup crypt-pflags
* @{
*/
/**
* LUKS2 header requirements
*/
/** Unfinished offline reencryption */
#define CRYPT_REQUIREMENT_OFFLINE_REENCRYPT (1 << 0)
/** Online reencryption in-progress */
#define CRYPT_REQUIREMENT_ONLINE_REENCRYPT (1 << 1)
/** unknown requirement in header (output only) */
#define CRYPT_REQUIREMENT_UNKNOWN (1 << 31)
/**
* Persistent flags type
*/
typedef enum {
CRYPT_FLAGS_ACTIVATION, /**< activation flags, @see aflags */
CRYPT_FLAGS_REQUIREMENTS /**< requirements flags */
} crypt_flags_type;
/**
* Set persistent flags.
*
* @param cd crypt device handle (can be @e NULL)
* @param type type to set (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS)
* @param flags flags to set
*
* @return @e 0 on success or negative errno value otherwise
*
* @note Valid only for LUKS2.
*
* @note Not all activation flags can be stored. Only ALLOW_DISCARD,
* SAME_CPU_CRYPT, SUBMIT_FROM_CRYPT_CPU and NO_JOURNAL can be
* stored persistently.
*
* @note Only requirements flags recognised by current library may be set.
* CRYPT_REQUIREMENT_UNKNOWN is illegal (output only) in set operation.
*/
int crypt_persistent_flags_set(struct crypt_device *cd,
crypt_flags_type type,
uint32_t flags);
/**
* Get persistent flags stored in header.
*
* @param cd crypt device handle (can be @e NULL)
* @param type flags type to retrieve (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS)
* @param flags reference to output variable
*
* @return @e 0 on success or negative errno value otherwise
*/
int crypt_persistent_flags_get(struct crypt_device *cd,
crypt_flags_type type,
uint32_t *flags);
/** @} */
/**
* @defgroup crypt-activation Device activation
* @addtogroup crypt-activation
* @{
*/
/**
* Activate device or check passphrase.
*
* @param cd crypt device handle
* @param name name of device to create, if @e NULL only check passphrase
* @param keyslot requested keyslot to check or @e CRYPT_ANY_SLOT
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of @e passphrase
* @param flags activation flags
*
* @return unlocked key slot number or negative errno otherwise.
*/
int crypt_activate_by_passphrase(struct crypt_device *cd,
const char *name,
int keyslot,
const char *passphrase,
size_t passphrase_size,
uint32_t flags);
/**
* Activate device or check using key file.
*
* @param cd crypt device handle
* @param name name of device to create, if @e NULL only check keyfile
* @param keyslot requested keyslot to check or CRYPT_ANY_SLOT
* @param keyfile key file used to unlock volume key
* @param keyfile_size number of bytes to read from keyfile, 0 is unlimited
* @param keyfile_offset number of bytes to skip at start of keyfile
* @param flags activation flags
*
* @return unlocked key slot number or negative errno otherwise.
*/
int crypt_activate_by_keyfile_device_offset(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size,
uint64_t keyfile_offset,
uint32_t flags);
/**
* Backward compatible crypt_activate_by_keyfile_device_offset() (with size_t offset).
*/
int crypt_activate_by_keyfile_offset(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size,
size_t keyfile_offset,
uint32_t flags);
/**
* Backward compatible crypt_activate_by_keyfile_device_offset() (without offset).
*/
int crypt_activate_by_keyfile(struct crypt_device *cd,
const char *name,
int keyslot,
const char *keyfile,
size_t keyfile_size,
uint32_t flags);
/**
* Activate device using provided volume key.
*
* @param cd crypt device handle
* @param name name of device to create, if @e NULL only check volume key
* @param volume_key provided volume key (or @e NULL to use internal)
* @param volume_key_size size of volume_key
* @param flags activation flags
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note If @e NULL is used for volume_key, device has to be initialized
* by previous operation (like @ref crypt_format
* or @ref crypt_init_by_name)
* @note For VERITY the volume key means root hash required for activation.
* Because kernel dm-verity is always read only, you have to provide
* CRYPT_ACTIVATE_READONLY flag always.
* @note For TCRYPT the volume key should be always NULL and because master
* key from decrypted header is used instead.
*/
int crypt_activate_by_volume_key(struct crypt_device *cd,
const char *name,
const char *volume_key,
size_t volume_key_size,
uint32_t flags);
/**
* Activate VERITY device using provided key and optional signature).
*
* @param cd crypt device handle
* @param name name of device to create
* @param volume_key provided volume key
* @param volume_key_size size of volume_key
* @param signature buffer with signature for the key
* @param signature_size bsize of signature buffer
* @param flags activation flags
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note For VERITY the volume key means root hash required for activation.
* Because kernel dm-verity is always read only, you have to provide
* CRYPT_ACTIVATE_READONLY flag always.
*/
int crypt_activate_by_signed_key(struct crypt_device *cd,
const char *name,
const char *volume_key,
size_t volume_key_size,
const char *signature,
size_t signature_size,
uint32_t flags);
/**
* Activate device using passphrase stored in kernel keyring.
*
* @param cd crypt device handle
* @param name name of device to create, if @e NULL only check passphrase in keyring
* @param key_description kernel keyring key description library should look
* for passphrase in
* @param keyslot requested keyslot to check or CRYPT_ANY_SLOT
* @param flags activation flags
*
* @return @e unlocked keyslot number on success or negative errno value otherwise.
*
* @note Keyslot passphrase must be stored in 'user' key type
* and the key has to be reachable for process context
* on behalf of which this function is called.
*/
int crypt_activate_by_keyring(struct crypt_device *cd,
const char *name,
const char *key_description,
int keyslot,
uint32_t flags);
/** lazy deactivation - remove once last user releases it */
#define CRYPT_DEACTIVATE_DEFERRED (1 << 0)
/** force deactivation - if the device is busy, it is replaced by error device */
#define CRYPT_DEACTIVATE_FORCE (1 << 1)
/**
* Deactivate crypt device. This function tries to remove active device-mapper
* mapping from kernel. Also, sensitive data like the volume key are removed from
* memory
*
* @param cd crypt device handle, can be @e NULL
* @param name name of device to deactivate
* @param flags deactivation flags
*
* @return @e 0 on success or negative errno value otherwise.
*
*/
int crypt_deactivate_by_name(struct crypt_device *cd,
const char *name,
uint32_t flags);
/**
* Deactivate crypt device. See @ref crypt_deactivate_by_name with empty @e flags.
*/
int crypt_deactivate(struct crypt_device *cd, const char *name);
/** @} */
/**
* @defgroup crypt-key Volume Key manipulation
* @addtogroup crypt-key
* @{
*/
/**
* Get volume key from crypt device.
*
* @param cd crypt device handle
* @param keyslot use this keyslot or @e CRYPT_ANY_SLOT
* @param volume_key buffer for volume key
* @param volume_key_size on input, size of buffer @e volume_key,
* on output size of @e volume_key
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of @e passphrase
*
* @return unlocked key slot number or negative errno otherwise.
*
* @note For TCRYPT cipher chain is the volume key concatenated
* for all ciphers in chain.
* @note For VERITY the volume key means root hash used for activation.
*/
int crypt_volume_key_get(struct crypt_device *cd,
int keyslot,
char *volume_key,
size_t *volume_key_size,
const char *passphrase,
size_t passphrase_size);
/**
* Verify that provided volume key is valid for crypt device.
*
* @param cd crypt device handle
* @param volume_key provided volume key
* @param volume_key_size size of @e volume_key
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_volume_key_verify(struct crypt_device *cd,
const char *volume_key,
size_t volume_key_size);
/** @} */
/**
* @defgroup crypt-devstat Crypt and Verity device status
* @addtogroup crypt-devstat
* @{
*/
/**
* Device status
*/
typedef enum {
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 */
} crypt_status_info;
/**
* Get status info about device name.
*
* @param cd crypt device handle, can be @e NULL
* @param name crypt device name
*
* @return value defined by crypt_status_info.
*
*/
crypt_status_info crypt_status(struct crypt_device *cd, const char *name);
/**
* Dump text-formatted information about crypt or verity device to log output.
*
* @param cd crypt device handle
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_dump(struct crypt_device *cd);
/**
* Get cipher used in device.
*
* @param cd crypt device handle
*
* @return used cipher, e.g. "aes" or @e NULL otherwise
*
*/
const char *crypt_get_cipher(struct crypt_device *cd);
/**
* Get cipher mode used in device.
*
* @param cd crypt device handle
*
* @return used cipher mode e.g. "xts-plain" or @e otherwise
*
*/
const char *crypt_get_cipher_mode(struct crypt_device *cd);
/**
* Get device UUID.
*
* @param cd crypt device handle
*
* @return device UUID or @e NULL if not set
*
*/
const char *crypt_get_uuid(struct crypt_device *cd);
/**
* Get path to underlaying device.
*
* @param cd crypt device handle
*
* @return path to underlaying device name
*
*/
const char *crypt_get_device_name(struct crypt_device *cd);
/**
* Get path to detached metadata device or @e NULL if it is not detached.
*
* @param cd crypt device handle
*
* @return path to underlaying device name
*
*/
const char *crypt_get_metadata_device_name(struct crypt_device *cd);
/**
* Get device offset in 512-bytes sectors where real data starts (on underlying device).
*
* @param cd crypt device handle
*
* @return device offset in sectors
*
*/
uint64_t crypt_get_data_offset(struct crypt_device *cd);
/**
* Get IV offset in 512-bytes sectors (skip).
*
* @param cd crypt device handle
*
* @return IV offset
*
*/
uint64_t crypt_get_iv_offset(struct crypt_device *cd);
/**
* Get size (in bytes) of volume key for crypt device.
*
* @param cd crypt device handle
*
* @return volume key size
*
* @note For LUKS2, this function can be used only if there is at least
* one keyslot assigned to data segment.
*/
int crypt_get_volume_key_size(struct crypt_device *cd);
/**
* Get size (in bytes) of encryption sector for crypt device.
*
* @param cd crypt device handle
*
* @return sector size
*
*/
int crypt_get_sector_size(struct crypt_device *cd);
/**
* Get device parameters for VERITY device.
*
* @param cd crypt device handle
* @param vp verity device info
*
* @e 0 on success or negative errno value otherwise.
*
*/
int crypt_get_verity_info(struct crypt_device *cd,
struct crypt_params_verity *vp);
/**
* Get device parameters for INTEGRITY device.
*
* @param cd crypt device handle
* @param ip verity device info
*
* @e 0 on success or negative errno value otherwise.
*
*/
int crypt_get_integrity_info(struct crypt_device *cd,
struct crypt_params_integrity *ip);
/** @} */
/**
* @defgroup crypt-benchmark Benchmarking
* Benchmarking of algorithms
* @addtogroup crypt-benchmark
* @{
*/
/**
* Informational benchmark for ciphers.
*
* @param cd crypt device handle
* @param cipher (e.g. "aes")
* @param cipher_mode (e.g. "xts"), IV generator is ignored
* @param volume_key_size size of volume key in bytes
* @param iv_size size of IV in bytes
* @param buffer_size size of encryption buffer in bytes used in test
* @param encryption_mbs measured encryption speed in MiB/s
* @param decryption_mbs measured decryption speed in MiB/s
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note If encryption_buffer_size is too small and encryption time
* cannot be properly measured, -ERANGE is returned.
*/
int crypt_benchmark(struct crypt_device *cd,
const char *cipher,
const char *cipher_mode,
size_t volume_key_size,
size_t iv_size,
size_t buffer_size,
double *encryption_mbs,
double *decryption_mbs);
/**
* Informational benchmark for PBKDF.
*
* @param cd crypt device handle
* @param pbkdf PBKDF parameters
* @param password password for benchmark
* @param password_size size of password
* @param salt salt for benchmark
* @param salt_size size of salt
* @param volume_key_size output volume key size
* @param progress callback function
* @param usrptr provided identification in callback
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_benchmark_pbkdf(struct crypt_device *cd,
struct crypt_pbkdf_type *pbkdf,
const char *password,
size_t password_size,
const char *salt,
size_t salt_size,
size_t volume_key_size,
int (*progress)(uint32_t time_ms, void *usrptr),
void *usrptr);
/** @} */
/**
* @addtogroup crypt-keyslot
* @{
*/
/**
* Crypt keyslot info
*/
typedef enum {
CRYPT_SLOT_INVALID, /**< invalid keyslot */
CRYPT_SLOT_INACTIVE, /**< keyslot is inactive (free) */
CRYPT_SLOT_ACTIVE, /**< keyslot is active (used) */
CRYPT_SLOT_ACTIVE_LAST,/**< keylost is active (used)
* and last used at the same time */
CRYPT_SLOT_UNBOUND /**< keyslot is active and not bound
* to any crypt segment (LUKS2 only) */
} crypt_keyslot_info;
/**
* Get information about particular key slot.
*
* @param cd crypt device handle
* @param keyslot requested keyslot to check or CRYPT_ANY_SLOT
*
* @return value defined by crypt_keyslot_info
*
*/
crypt_keyslot_info crypt_keyslot_status(struct crypt_device *cd, int keyslot);
/**
* Crypt keyslot priority
*/
typedef enum {
CRYPT_SLOT_PRIORITY_INVALID =-1, /**< no such slot */
CRYPT_SLOT_PRIORITY_IGNORE = 0, /**< CRYPT_ANY_SLOT will ignore it for open */
CRYPT_SLOT_PRIORITY_NORMAL = 1, /**< default priority, tried after preferred */
CRYPT_SLOT_PRIORITY_PREFER = 2, /**< will try to open first */
} crypt_keyslot_priority;
/**
* Get keyslot priority (LUKS2)
*
* @param cd crypt device handle
* @param keyslot keyslot number
*
* @return value defined by crypt_keyslot_priority
*/
crypt_keyslot_priority crypt_keyslot_get_priority(struct crypt_device *cd, int keyslot);
/**
* Set keyslot priority (LUKS2)
*
* @param cd crypt device handle
* @param keyslot keyslot number
* @param priority priority defined in crypt_keyslot_priority
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_keyslot_set_priority(struct crypt_device *cd, int keyslot, crypt_keyslot_priority priority);
/**
* Get number of keyslots supported for device type.
*
* @param type crypt device type
*
* @return slot count or negative errno otherwise if device
* doesn't not support keyslots.
*/
int crypt_keyslot_max(const char *type);
/**
* Get keyslot area pointers (relative to metadata device).
*
* @param cd crypt device handle
* @param keyslot keyslot number
* @param offset offset on metadata device (in bytes)
* @param length length of keyslot area (in bytes)
*
* @return @e 0 on success or negative errno value otherwise.
*
*/
int crypt_keyslot_area(struct crypt_device *cd,
int keyslot,
uint64_t *offset,
uint64_t *length);
/**
* Get size (in bytes) of stored key in particular keyslot.
* Use for LUKS2 unbound keyslots, for other keyslots it is the same as @ref crypt_get_volume_key_size
*
* @param cd crypt device handle
* @param keyslot keyslot number
*
* @return volume key size or negative errno value otherwise.
*
*/
int crypt_keyslot_get_key_size(struct crypt_device *cd, int keyslot);
/**
* Get cipher and key size for keyslot encryption.
* Use for LUKS2 keyslot to set different encryption type than for data encryption.
* Parameters will be used for next keyslot operations.
*
* @param cd crypt device handle
* @param keyslot keyslot number of CRYPT_ANY_SLOT for default
* @param key_size encryption key size (in bytes)
*
* @return cipher specification on success or @e NULL.
*
* @note This is the encryption of keyslot itself, not the data encryption algorithm!
*/
const char *crypt_keyslot_get_encryption(struct crypt_device *cd, int keyslot, size_t *key_size);
/**
* Get PBKDF parameters for keyslot.
*
* @param cd crypt device handle
* @param keyslot keyslot number
* @param pbkdf struct with returned PBKDF parameters
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_keyslot_get_pbkdf(struct crypt_device *cd, int keyslot, struct crypt_pbkdf_type *pbkdf);
/**
* Set encryption for keyslot.
* Use for LUKS2 keyslot to set different encryption type than for data encryption.
* Parameters will be used for next keyslot operations that create or change a keyslot.
*
* @param cd crypt device handle
* @param cipher (e.g. "aes-xts-plain64")
* @param key_size encryption key size (in bytes)
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note To reset to default keyslot encryption (the same as for data)
* set cipher to NULL and key size to 0.
*/
int crypt_keyslot_set_encryption(struct crypt_device *cd,
const char *cipher,
size_t key_size);
/**
* Get directory where mapped crypt devices are created
*
* @return the directory path
*/
const char *crypt_get_dir(void);
/** @} */
/**
* @defgroup crypt-backup Device metadata backup
* @addtogroup crypt-backup
* @{
*/
/**
* Backup header and keyslots to file.
*
* @param cd crypt device handle
* @param requested_type @link crypt-type @endlink or @e NULL for all known
* @param backup_file file to backup header to
*
* @return @e 0 on success or negative errno value otherwise.
*
*/
int crypt_header_backup(struct crypt_device *cd,
const char *requested_type,
const char *backup_file);
/**
* Restore header and keyslots from backup file.
*
* @param cd crypt device handle
* @param requested_type @link crypt-type @endlink or @e NULL for all known
* @param backup_file file to restore header from
*
* @return @e 0 on success or negative errno value otherwise.
*
*/
int crypt_header_restore(struct crypt_device *cd,
const char *requested_type,
const char *backup_file);
/** @} */
/**
* @defgroup crypt-dbg Library debug level
* Set library debug level
* @addtogroup crypt-dbg
* @{
*/
/** Debug all */
#define CRYPT_DEBUG_ALL -1
/** Debug all with additional JSON dump (for LUKS2) */
#define CRYPT_DEBUG_JSON -2
/** Debug none */
#define CRYPT_DEBUG_NONE 0
/**
* Set the debug level for library
*
* @param level debug level
*
*/
void crypt_set_debug_level(int level);
/** @} */
/**
* @defgroup crypt-keyfile Function to read keyfile
* @addtogroup crypt-keyfile
* @{
*/
/**
* Read keyfile
*
* @param cd crypt device handle
* @param keyfile keyfile to read
* @param key buffer for key
* @param key_size_read size of read key
* @param keyfile_offset key offset in keyfile
* @param key_size exact key length to read from file or 0
* @param flags keyfile read flags
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note If key_size is set to zero we read internal max length
* and actual size read is returned via key_size_read parameter.
*/
int crypt_keyfile_device_read(struct crypt_device *cd,
const char *keyfile,
char **key, size_t *key_size_read,
uint64_t keyfile_offset,
size_t key_size,
uint32_t flags);
/**
* Backward compatible crypt_keyfile_device_read() (with size_t offset).
*/
int crypt_keyfile_read(struct crypt_device *cd,
const char *keyfile,
char **key, size_t *key_size_read,
size_t keyfile_offset,
size_t key_size,
uint32_t flags);
/** Read key only to the first end of line (\\n). */
#define CRYPT_KEYFILE_STOP_EOL (1 << 0)
/** @} */
/**
* @defgroup crypt-wipe Function to wipe device
* @addtogroup crypt-wipe
* @{
*/
/**
* Wipe pattern
*/
typedef enum {
CRYPT_WIPE_ZERO, /**< Fill with zeroes */
CRYPT_WIPE_RANDOM, /**< Use RNG to fill data */
CRYPT_WIPE_ENCRYPTED_ZERO, /**< Add encryption and fill with zeroes as plaintext */
CRYPT_WIPE_SPECIAL, /**< Compatibility only, do not use (Gutmann method) */
} crypt_wipe_pattern;
/**
* Wipe/Fill (part of) a device with the selected pattern.
*
* @param cd crypt device handle
* @param dev_path path to device to wipe or @e NULL if data device should be used
* @param pattern selected wipe pattern
* @param offset offset on device (in bytes)
* @param length length of area to be wiped (in bytes)
* @param wipe_block_size used block for wiping (one step) (in bytes)
* @param flags wipe flags
* @param progress callback function called after each @e wipe_block_size or @e NULL
* @param usrptr provided identification in callback
*
* @return @e 0 on success or negative errno value otherwise.
*
* @note A @e progress callback can interrupt wipe process by returning non-zero code.
*
* @note If the error values is -EIO or -EINTR, some part of the device could
* be overwritten. Other error codes (-EINVAL, -ENOMEM) means that no IO was performed.
*/
int crypt_wipe(struct crypt_device *cd,
const char *dev_path, /* if null, use data device */
crypt_wipe_pattern pattern,
uint64_t offset,
uint64_t length,
size_t wipe_block_size,
uint32_t flags,
int (*progress)(uint64_t size, uint64_t offset, void *usrptr),
void *usrptr
);
/** Use direct-io */
#define CRYPT_WIPE_NO_DIRECT_IO (1 << 0)
/** @} */
/**
* @defgroup crypt-tokens LUKS2 token wrapper access
*
* Utilities for handling tokens LUKS2
* Token is a device or a method how to read password for particular keyslot
* automatically. It can be chunk of data stored on hardware token or
* just a metadata how to generate the password.
*
* @addtogroup crypt-tokens
* @{
*/
/** Iterate through all tokens */
#define CRYPT_ANY_TOKEN -1
/**
* Get content of a token definition in JSON format.
*
* @param cd crypt device handle
* @param token token id
* @param json buffer with JSON
*
* @return allocated token id or negative errno otherwise.
*/
int crypt_token_json_get(struct crypt_device *cd,
int token,
const char **json);
/**
* Store content of a token definition in JSON format.
*
* @param cd crypt device handle
* @param token token id or @e CRYPT_ANY_TOKEN to allocate new one
* @param json buffer with JSON or @e NULL to remove token
*
* @return allocated token id or negative errno otherwise.
*
* @note The buffer must be in proper JSON format and must contain at least
* string "type" with slot type and an array of string names "keyslots".
* Keyslots array contains assignments to particular slots and can be empty.
*/
int crypt_token_json_set(struct crypt_device *cd,
int token,
const char *json);
/**
* Token info
*/
typedef enum {
CRYPT_TOKEN_INVALID, /**< token is invalid */
CRYPT_TOKEN_INACTIVE, /**< token is empty (free) */
CRYPT_TOKEN_INTERNAL, /**< active internal token with driver */
CRYPT_TOKEN_INTERNAL_UNKNOWN, /**< active internal token (reserved name) with missing token driver */
CRYPT_TOKEN_EXTERNAL, /**< active external (user defined) token with driver */
CRYPT_TOKEN_EXTERNAL_UNKNOWN, /**< active external (user defined) token with missing token driver */
} crypt_token_info;
/**
* Get info for specific token.
*
* @param cd crypt device handle
* @param token existing token id
* @param type pointer for returned type string
*
* @return token status info. For any returned status (besides CRYPT_TOKEN_INVALID
* and CRYPT_TOKEN_INACTIVE) and if type parameter is not NULL it will
* contain address of type string.
*
* @note if required, create a copy of string referenced in *type before calling next
* libcryptsetup API function. The reference may become invalid.
*/
crypt_token_info crypt_token_status(struct crypt_device *cd, int token, const char **type);
/**
* LUKS2 keyring token parameters.
*
* @see crypt_token_builtin_set
*
*/
struct crypt_token_params_luks2_keyring {
const char *key_description; /**< Reference in keyring */
};
/**
* Create a new luks2 keyring token.
*
* @param cd crypt device handle
* @param token token id or @e CRYPT_ANY_TOKEN to allocate new one
* @param params luks2 keyring token params
*
* @return allocated token id or negative errno otherwise.
*
*/
int crypt_token_luks2_keyring_set(struct crypt_device *cd,
int token,
const struct crypt_token_params_luks2_keyring *params);
/**
* Get LUKS2 keyring token params
*
* @param cd crypt device handle
* @param token existing luks2 keyring token id
* @param params returned luks2 keyring token params
*
* @return allocated token id or negative errno otherwise.
*
* @note do not call free() on params members. Members are valid only
* until next libcryptsetup function is called.
*/
int crypt_token_luks2_keyring_get(struct crypt_device *cd,
int token,
struct crypt_token_params_luks2_keyring *params);
/**
* Assign a token to particular keyslot.
* (There can be more keyslots assigned to one token id.)
*
* @param cd crypt device handle
* @param token token id
* @param keyslot keyslot to be assigned to token (CRYPT_ANY SLOT
* assigns all active keyslots to token)
*
* @return allocated token id or negative errno otherwise.
*/
int crypt_token_assign_keyslot(struct crypt_device *cd,
int token,
int keyslot);
/**
* Unassign a token from particular keyslot.
* (There can be more keyslots assigned to one token id.)
*
* @param cd crypt device handle
* @param token token id
* @param keyslot keyslot to be unassigned from token (CRYPT_ANY SLOT
* unassigns all active keyslots from token)
*
* @return allocated token id or negative errno otherwise.
*/
int crypt_token_unassign_keyslot(struct crypt_device *cd,
int token,
int keyslot);
/**
* Get info about token assignment to particular keyslot.
*
* @param cd crypt device handle
* @param token token id
* @param keyslot keyslot
*
* @return 0 on success (token exists and is assigned to the keyslot),
* -ENOENT if token is not assigned to a keyslot (token, keyslot
* or both may be inactive) or other negative errno otherwise.
*/
int crypt_token_is_assigned(struct crypt_device *cd,
int token,
int keyslot);
/**
* Token handler open function prototype.
* This function retrieves password from a token and return allocated buffer
* containing this password. This buffer has to be deallocated by calling
* free() function and content should be wiped before deallocation.
*
* @param cd crypt device handle
* @param token token id
* @param buffer returned allocated buffer with password
* @param buffer_len length of the buffer
* @param usrptr user data in @link crypt_activate_by_token @endlink
*/
typedef int (*crypt_token_open_func) (
struct crypt_device *cd,
int token,
char **buffer,
size_t *buffer_len,
void *usrptr);
/**
* Token handler buffer free function prototype.
* This function is used by library to free the buffer with keyslot
* passphrase when it's no longer needed. If not defined the library
* overwrites buffer with zeroes and call free().
*
* @param buffer the buffer with keyslot passphrase
* @param buffer_len the buffer length
*/
typedef void (*crypt_token_buffer_free_func) (void *buffer, size_t buffer_len);
/**
* Token handler validate function prototype.
* This function validates JSON representation of user defined token for additional data
* specific for its token type. If defined in the handler, it's called
* during @link crypt_activate_by_token @endlink. It may also be called during
* @link crypt_token_json_set @endlink when appropriate token handler was registered before
* with @link crypt_token_register @endlink.
*
* @param cd crypt device handle
* @param json buffer with JSON
*/
typedef int (*crypt_token_validate_func) (struct crypt_device *cd, const char *json);
/**
* Token handler dump function prototype.
* This function is supposed to print token implementation specific details. It gets
* called during @link crypt_dump @endlink if token handler was registered before.
*
* @param cd crypt device handle
* @param json buffer with token JSON
*
* @note dump implementations are advised to use @link crypt_log @endlink function
* to dump token details.
*/
typedef void (*crypt_token_dump_func) (struct crypt_device *cd, const char *json);
/**
* Token handler
*/
typedef struct {
const char *name; /**< token handler name */
crypt_token_open_func open; /**< token handler open function */
crypt_token_buffer_free_func buffer_free; /**< token handler buffer_free function (optional) */
crypt_token_validate_func validate; /**< token handler validate function (optional) */
crypt_token_dump_func dump; /**< token handler dump function (optional) */
} crypt_token_handler;
/**
* Register token handler
*
* @param handler token handler to register
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_token_register(const crypt_token_handler *handler);
/**
* Activate device or check key using a token.
*
* @param cd crypt device handle
* @param name name of device to create, if @e NULL only check token
* @param token requested token to check or CRYPT_ANY_TOKEN to check all
* @param usrptr provided identification in callback
* @param flags activation flags
*
* @return unlocked key slot number or negative errno otherwise.
*/
int crypt_activate_by_token(struct crypt_device *cd,
const char *name,
int token,
void *usrptr,
uint32_t flags);
/** @} */
/**
* @defgroup crypt-reencryption LUKS2 volume reencryption support
*
* Set of functions to handling LUKS2 volume reencryption
*
* @addtogroup crypt-reencryption
* @{
*/
/** Initialize reencryption metadata but do not run reencryption yet. (in) */
#define CRYPT_REENCRYPT_INITIALIZE_ONLY (1 << 0)
/** Move the first segment, used only with data shift. (in/out) */
#define CRYPT_REENCRYPT_MOVE_FIRST_SEGMENT (1 << 1)
/** Resume already initialized reencryption only. (in) */
#define CRYPT_REENCRYPT_RESUME_ONLY (1 << 2)
/** Run reencryption recovery only. (in) */
#define CRYPT_REENCRYPT_RECOVERY (1 << 3)
/**
* Reencryption direction
*/
typedef enum {
CRYPT_REENCRYPT_FORWARD = 0, /**< forward direction */
CRYPT_REENCRYPT_BACKWARD /**< backward direction */
} crypt_reencrypt_direction_info;
/**
* Reencryption mode
*/
typedef enum {
CRYPT_REENCRYPT_REENCRYPT = 0, /**< Reencryption mode */
CRYPT_REENCRYPT_ENCRYPT, /**< Encryption mode */
CRYPT_REENCRYPT_DECRYPT, /**< Decryption mode */
} crypt_reencrypt_mode_info;
/**
* LUKS2 reencryption options.
*/
struct crypt_params_reencrypt {
crypt_reencrypt_mode_info mode; /**< Reencryption mode, immutable after first init. */
crypt_reencrypt_direction_info direction; /**< Reencryption direction, immutable after first init. */
const char *resilience; /**< Resilience mode: "none", "checksum", "journal" or "shift" (only "shift" is immutable after init) */
const char *hash; /**< Used hash for "checksum" resilience type, ignored otherwise. */
uint64_t data_shift; /**< Used in "shift" mode, must be non-zero, immutable after first init. */
uint64_t max_hotzone_size; /**< Exact hotzone size for "none" mode. Maximum hotzone size for "checksum" and "journal" modes. */
uint64_t device_size; /**< Reencrypt only initial part of the data device. */
const struct crypt_params_luks2 *luks2; /**< LUKS2 parameters for the final reencryption volume.*/
uint32_t flags; /**< Reencryption flags. */
};
/**
* Initialize reencryption metadata using passphrase.
*
* This function initializes on-disk metadata to include all reencryption segments,
* according to the provided options.
* If metadata already contains ongoing reencryption metadata, it loads these parameters
* (in this situation all parameters except @e name and @e passphrase can be omitted).
*
* @param cd crypt device handle
* @param name name of active device or @e NULL for offline reencryption
* @param passphrase passphrase used to unlock volume key
* @param passphrase_size size of @e passphrase (binary data)
* @param keyslot_old keyslot to unlock existing device or CRYPT_ANY_SLOT
* @param keyslot_new existing (unbound) reencryption keyslot; must be set except for decryption
* @param cipher cipher specification (e.g. "aes")
* @param cipher_mode cipher mode and IV (e.g. "xts-plain64")
* @param params reencryption parameters @link crypt_params_reencrypt @endlink.
*
* @return reencryption key slot number or negative errno otherwise.
*/
int crypt_reencrypt_init_by_passphrase(struct crypt_device *cd,
const char *name,
const char *passphrase,
size_t passphrase_size,
int keyslot_old,
int keyslot_new,
const char *cipher,
const char *cipher_mode,
const struct crypt_params_reencrypt *params);
/**
* Initialize reencryption metadata using passphrase in keyring.
*
* This function initializes on-disk metadata to include all reencryption segments,
* according to the provided options.
* If metadata already contains ongoing reencryption metadata, it loads these parameters
* (in this situation all parameters except @e name and @e key_description can be omitted).
*
* @param cd crypt device handle
* @param name name of active device or @e NULL for offline reencryption
* @param key_description passphrase (key) identification in keyring
* @param keyslot_old keyslot to unlock existing device or CRYPT_ANY_SLOT
* @param keyslot_new existing (unbound) reencryption keyslot; must be set except for decryption
* @param cipher cipher specification (e.g. "aes")
* @param cipher_mode cipher mode and IV (e.g. "xts-plain64")
* @param params reencryption parameters @link crypt_params_reencrypt @endlink.
*
* @return reencryption key slot number or negative errno otherwise.
*/
int crypt_reencrypt_init_by_keyring(struct crypt_device *cd,
const char *name,
const char *key_description,
int keyslot_old,
int keyslot_new,
const char *cipher,
const char *cipher_mode,
const struct crypt_params_reencrypt *params);
/**
* Run data reencryption.
*
* @param cd crypt device handle
* @param progress is a callback funtion reporting device \b size,
* current \b offset of reencryption and provided \b usrptr identification
*
* @return @e 0 on success or negative errno value otherwise.
*/
int crypt_reencrypt(struct crypt_device *cd,
int (*progress)(uint64_t size, uint64_t offset, void *usrptr));
/**
* Reencryption status info
*/
typedef enum {
CRYPT_REENCRYPT_NONE = 0, /**< No reencryption in progress */
CRYPT_REENCRYPT_CLEAN, /**< Ongoing reencryption in a clean state. */
CRYPT_REENCRYPT_CRASH, /**< Aborted reencryption that need internal recovery. */
CRYPT_REENCRYPT_INVALID /**< Invalid state. */
} crypt_reencrypt_info;
/**
* LUKS2 reencryption status.
*
* @param cd crypt device handle
* @param params reencryption parameters
*
* @return reencryption status info and parameters.
*/
crypt_reencrypt_info crypt_reencrypt_status(struct crypt_device *cd,
struct crypt_params_reencrypt *params);
/** @} */
/**
* @defgroup crypt-memory Safe memory helpers functions
* @addtogroup crypt-memory
* @{
*/
/**
* Allocate safe memory (content is safely wiped on deallocation).
*
* @param size size of memory in bytes
*
* @return pointer to allocate memory or @e NULL.
*/
void *crypt_safe_alloc(size_t size);
/**
* Release safe memory, content is safely wiped
* The pointer must be allocated with @link crypt_safe_alloc @endlink
*
* @param data pointer to memory to be deallocated
*
* @return pointer to allocate memory or @e NULL.
*/
void crypt_safe_free(void *data);
/**
* Reallocate safe memory (content is copied and safely wiped on deallocation).
*
* @param data pointer to memory to be deallocated
* @param size new size of memory in bytes
*
* @return pointer to allocate memory or @e NULL.
*/
void *crypt_safe_realloc(void *data, size_t size);
/**
* Safe clear memory area (compile should not compile this call out).
*
* @param data pointer to memory to cleared
* @param size new size of memory in bytes
*
* @return pointer to allocate memory or @e NULL.
*/
void crypt_safe_memzero(void *data, size_t size);
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* _LIBCRYPTSETUP_H */