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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* LUKS - Linux Unified Key Setup
*
* Copyright (C) 2004-2006 Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2025 Red Hat, Inc. All rights reserved.
*/
#ifndef INCLUDED_CRYPTSETUP_LUKS_LUKS_H
#define INCLUDED_CRYPTSETUP_LUKS_LUKS_H
/*
* LUKS partition header
*/
#include "libcryptsetup.h"
#define LUKS_CIPHERNAME_L 32
#define LUKS_CIPHERMODE_L 32
#define LUKS_HASHSPEC_L 32
#define LUKS_DIGESTSIZE 20 // since SHA1
#define LUKS_HMACSIZE 32
#define LUKS_SALTSIZE 32
#define LUKS_NUMKEYS 8
// Minimal number of iterations
#define LUKS_MKD_ITERATIONS_MIN 1000
#define LUKS_SLOT_ITERATIONS_MIN 1000
// Iteration time for digest in ms
#define LUKS_MKD_ITERATIONS_MS 125
#define LUKS_KEY_DISABLED_OLD 0
#define LUKS_KEY_ENABLED_OLD 0xCAFE
#define LUKS_KEY_DISABLED 0x0000DEAD
#define LUKS_KEY_ENABLED 0x00AC71F3
#define LUKS_STRIPES 4000
// partition header starts with magic
#define LUKS_MAGIC {'L','U','K','S', 0xba, 0xbe};
#define LUKS_MAGIC_L 6
/* Actually we need only 37, but we don't want struct autoaligning to kick in */
#define UUID_STRING_L 40
/* Offset to keyslot area [in bytes] */
#define LUKS_ALIGN_KEYSLOTS 4096
/* Maximal LUKS header size, for wipe [in bytes] */
#define LUKS_MAX_KEYSLOT_SIZE 0x1000000 /* 16 MB, up to 32768 bits key */
/* Any integer values are stored in network byte order on disk and must be
converted */
struct volume_key;
struct device_backend;
struct luks_phdr {
char magic[LUKS_MAGIC_L];
uint16_t version;
char cipherName[LUKS_CIPHERNAME_L];
char cipherMode[LUKS_CIPHERMODE_L];
char hashSpec[LUKS_HASHSPEC_L];
uint32_t payloadOffset;
uint32_t keyBytes;
char mkDigest[LUKS_DIGESTSIZE];
char mkDigestSalt[LUKS_SALTSIZE];
uint32_t mkDigestIterations;
char uuid[UUID_STRING_L];
struct {
uint32_t active;
/* parameters used for password processing */
uint32_t passwordIterations;
char passwordSalt[LUKS_SALTSIZE];
/* parameters used for AF store/load */
uint32_t keyMaterialOffset;
uint32_t stripes;
} keyblock[LUKS_NUMKEYS];
/* Align it to 512 sector size */
char _padding[432];
};
int LUKS_verify_volume_key(const struct luks_phdr *hdr,
const struct volume_key *vk);
int LUKS_check_cipher(struct crypt_device *ctx,
size_t keylength,
const char *cipher,
const char *cipher_mode);
int LUKS_generate_phdr(struct luks_phdr *header,
const struct volume_key *vk,
const char *cipherName,
const char *cipherMode,
const char *hashSpec,
const char *uuid,
uint64_t data_offset,
uint64_t align_offset,
uint64_t required_alignment,
struct crypt_device *ctx);
int LUKS_read_phdr(
struct luks_phdr *hdr,
int require_luks_device,
int repair,
struct crypt_device *ctx);
int LUKS_read_phdr_backup(
const char *backup_file,
struct luks_phdr *hdr,
int require_luks_device,
struct crypt_device *ctx);
int LUKS_hdr_uuid_set(
struct luks_phdr *hdr,
const char *uuid,
struct crypt_device *ctx);
int LUKS_hdr_backup(
const char *backup_file,
struct crypt_device *ctx);
int LUKS_hdr_restore(
const char *backup_file,
struct luks_phdr *hdr,
struct crypt_device *ctx);
int LUKS_write_phdr(
struct luks_phdr *hdr,
struct crypt_device *ctx);
int LUKS_set_key(
unsigned int keyIndex,
const char *password,
size_t passwordLen,
struct luks_phdr *hdr,
struct volume_key *vk,
struct crypt_device *ctx);
int LUKS_open_key_with_hdr(
int keyIndex,
const char *password,
size_t passwordLen,
struct luks_phdr *hdr,
struct volume_key **vk,
struct crypt_device *ctx);
int LUKS_del_key(
unsigned int keyIndex,
struct luks_phdr *hdr,
struct crypt_device *ctx);
int LUKS_wipe_header_areas(struct luks_phdr *hdr,
struct crypt_device *ctx);
crypt_keyslot_info LUKS_keyslot_info(struct luks_phdr *hdr, int keyslot);
int LUKS_keyslot_find_empty(struct luks_phdr *hdr);
int LUKS_keyslot_active_count(struct luks_phdr *hdr);
int LUKS_keyslot_set(struct luks_phdr *hdr, int keyslot, int enable,
struct crypt_device *ctx);
int LUKS_keyslot_area(const struct luks_phdr *hdr,
int keyslot,
uint64_t *offset,
uint64_t *length);
size_t LUKS_device_sectors(const struct luks_phdr *hdr);
size_t LUKS_keyslots_offset(const struct luks_phdr *hdr);
int LUKS_keyslot_pbkdf(struct luks_phdr *hdr, int keyslot,
struct crypt_pbkdf_type *pbkdf);
int LUKS1_activate(struct crypt_device *cd,
const char *name,
struct volume_key *vk,
uint32_t flags);
#endif
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