+int crypt_volume_key_set_description(struct volume_key *key, const char *key_description);
+void crypt_volume_key_set_id(struct volume_key *vk, int id);
+int crypt_volume_key_get_id(const struct volume_key *vk);
+void crypt_volume_key_add_next(struct volume_key **vks, struct volume_key *vk);
+struct volume_key *crypt_volume_key_next(struct volume_key *vk);
+struct volume_key *crypt_volume_key_by_id(struct volume_key *vk, int id);
+
+struct crypt_pbkdf_type *crypt_get_pbkdf(struct crypt_device *cd);
+int init_pbkdf_type(struct crypt_device *cd,
+ const struct crypt_pbkdf_type *pbkdf,
+ const char *dev_type);
+int verify_pbkdf_params(struct crypt_device *cd,
+ const struct crypt_pbkdf_type *pbkdf);
+int crypt_benchmark_pbkdf_internal(struct crypt_device *cd,
+ struct crypt_pbkdf_type *pbkdf,
+ size_t volume_key_size);
+const char *crypt_get_cipher_spec(struct crypt_device *cd);
+
+/* Device backend */
+struct device;
+int device_alloc(struct crypt_device *cd, struct device **device, const char *path);
+int device_alloc_no_check(struct device **device, const char *path);
+void device_close(struct crypt_device *cd, struct device *device);
+void device_free(struct crypt_device *cd, struct device *device);
+const char *device_path(const struct device *device);
+const char *device_dm_name(const struct device *device);
+const char *device_block_path(const struct device *device);
+void device_topology_alignment(struct crypt_device *cd,
+ struct device *device,
+ unsigned long *required_alignment, /* bytes */
+ unsigned long *alignment_offset, /* bytes */
+ unsigned long default_alignment);
+size_t device_block_size(struct crypt_device *cd, struct device *device);
+int device_read_ahead(struct device *device, uint32_t *read_ahead);
+int device_size(struct device *device, uint64_t *size);
+int device_open(struct crypt_device *cd, struct device *device, int flags);
+int device_open_excl(struct crypt_device *cd, struct device *device, int flags);
+void device_release_excl(struct crypt_device *cd, struct device *device);
+void device_disable_direct_io(struct device *device);
+int device_is_identical(struct device *device1, struct device *device2);
+int device_is_rotational(struct device *device);
+size_t device_alignment(struct device *device);
+int device_direct_io(const struct device *device);
+int device_fallocate(struct device *device, uint64_t size);
+void device_sync(struct crypt_device *cd, struct device *device);
+int device_check_size(struct crypt_device *cd,
+ struct device *device,
+ uint64_t req_offset, int falloc);
+void device_set_block_size(struct device *device, size_t size);
+size_t device_optimal_encryption_sector_size(struct crypt_device *cd, struct device *device);
+
+int device_open_locked(struct crypt_device *cd, struct device *device, int flags);
+int device_read_lock(struct crypt_device *cd, struct device *device);
+int device_write_lock(struct crypt_device *cd, struct device *device);
+void device_read_unlock(struct crypt_device *cd, struct device *device);
+void device_write_unlock(struct crypt_device *cd, struct device *device);
+bool device_is_locked(struct device *device);
+
+enum devcheck { DEV_OK = 0, DEV_EXCL = 1 };
+int device_check_access(struct crypt_device *cd,
+ struct device *device,
+ enum devcheck device_check);
+int device_block_adjust(struct crypt_device *cd,
+ struct device *device,
+ enum devcheck device_check,
+ uint64_t device_offset,
+ uint64_t *size,
+ uint32_t *flags);
+size_t size_round_up(size_t size, size_t block);
+
+int create_or_reload_device(struct crypt_device *cd, const char *name,
+ const char *type, struct crypt_dm_active_device *dmd);
+
+int create_or_reload_device_with_integrity(struct crypt_device *cd, const char *name,
+ const char *type, struct crypt_dm_active_device *dmd,
+ struct crypt_dm_active_device *dmdi);
+
+/* Receive backend devices from context helpers */
+struct device *crypt_metadata_device(struct crypt_device *cd);
+struct device *crypt_data_device(struct crypt_device *cd);