1 2#------------------------------------------------------------------------------ 3# $File: luks,v 1.5 2022/09/07 11:23:44 christos Exp $ 4# luks: file(1) magic for Linux Unified Key Setup 5# URL: https://en.wikipedia.org/wiki/Linux_Unified_Key_Setup 6# http://fileformats.archiveteam.org/wiki/LUKS 7# From: Anthon van der Neut <anthon@mnt.org> 8# Update: Joerg Jenderek 9# Note: verfied by command like `cryptsetup luksDump /dev/sda3` 10 110 string LUKS\xba\xbe LUKS encrypted file, 12# https://reposcope.com/mimetype/application/x-raw-disk-image 13!:mime application/x-raw-disk-image 14#!:mime application/x-luks-volume 15# img is the generic extension; no suffix for partitions; luksVolumeHeaderBackUp via zuluCrypt 16!:ext /luks/img/luksVolumeHeaderBackUp 17# version like: 1 2 18>6 beshort x ver %d 19# test for version 1 variant 20>6 beshort 1 21>>0 use luks-v1 22# test for version 2 variant 23>6 beshort >1 24>>0 use luks-v2 25# Reference: https://mirrors.edge.kernel.org/pub/linux/utils/cryptsetup/LUKS_docs/on-disk-format.pdf 26# http://mark0.net/download/triddefs_xml.7z/defs/l/luks.trid.xml 27# display information about LUKS version 1 280 name luks-v1 29# cipher-name like: aes twofish 30>8 string x [%s, 31# cipher-mode like: xts-plain64 cbc-essiv 32>40 string x %s, 33# hash specification like: sha256 sha1 ripemd160 34>72 string x %s] 35>168 string x UUID: %s 36# NEW PART! 37# payload-offset; start offset of the bulk data 38>104 ubelong x \b, at %#x data 39# key-bytes; number of key bytes; key-bytes*8=MK-bits 40>108 ubelong x \b, %u key bytes 41# mk-digest[20]; master key checksum from PBKDF2 42>112 ubequad x \b, MK digest %#16.16llx 43>>120 ubequad x \b%16.16llx 44>>128 ubelong x \b%8.8x 45# mk-digest-salt[32]; salt parameter for master key PBKDF2 46>132 ubequad x \b, MK salt %#16.16llx 47>>140 ubequad x \b%16.16llx 48>>148 ubequad x \b%16.16llx 49>>156 ubequad x \b%16.16llx 50# mk-digest-iter; iterations parameter for master key PBKDF2 51>164 ubelong x \b, %u MK iterations 52# key slot 1 53>208 ubelong =0x00AC71F3 \b; slot #0 54>>208 use luks-slot 55# key slot 2 56>256 ubelong =0x00AC71F3 \b; slot #1 57>>256 use luks-slot 58# key slot 3 59>304 ubelong =0x00AC71F3 \b; slot #2 60>>304 use luks-slot 61# key slot 4 62>352 ubelong =0x00AC71F3 \b; slot #3 63>>352 use luks-slot 64# key slot 5 65>400 ubelong =0x00AC71F3 \b; slot #4 66>>400 use luks-slot 67# key slot 6 68>448 ubelong =0x00AC71F3 \b; slot #5 69>>448 use luks-slot 70# key slot 7 71>496 ubelong =0x00AC71F3 \b; slot #6 72>>496 use luks-slot 73# key slot 8 74>544 ubelong =0x00AC71F3 \b; slot #7 75>>544 use luks-slot 76# Reference: https://gitlab.com/cryptsetup/LUKS2-docs/-/raw/master/luks2_doc_wip.pdf 77# http://mark0.net/download/triddefs_xml.7z/defs/l/luks2.trid.xml 78# display information about LUKS version 2 790 name luks-v2 80# hdr_size; size including JSON area called Metadata area by cryptsetup with value like: 16384 81>8 ubequad x \b, header size %llu 82# possible check for MAGIC_2ND after header 83#>(8.Q) string SKUL\xba\xbe \b, 2nd_HEADER_OK 84# seqid; sequence ID, increased on update; called Epoch by cryptsetup with value like: 3 4 8 10 85>16 ubequad x \b, ID %llu 86# label[48]; optional ASCII label or empty; called Label by cryptsetup with value like: "LUKS2_EXT4_ROOT" 87>24 string >\0 \b, label %s 88# csum_alg[32]; checksum algorithm like: sha256 sha1 sha512 wirlpool ripemd160 89>72 string x \b, algo %s 90# salt[64]; salt , unique for every header 91>104 ubequad x \b, salt %#llx... 92# uuid[40]; UID of device as string like: 242256c6-396e-4a35-af5f-5b70cb7af9a7 93>168 string x \b, UUID: %-.40s 94# subsystem[48]; optional owner subsystem label or empty 95>208 string >\0 \b, sub label %-.48s 96# hdr_offset; offset from device start [ bytes ] like: 0 97>256 ubequad !0 \b, offset %llx 98# char _padding [184]; must be zeroed 99#>264 ubequad x \b, padding %#16.16llx 100#>440 ubequad x \b...%16.16llx 101# csum[64]; header checksum 102>448 ubequad x \b, crc %#llx... 103# char _padding4096 [7*512]; Padding , must be zeroed 104#>512 ubequad x \b, more padding %#16.16llx 105#>4088 ubequad x \b...%16.16llx 106# JSON text data terminated by the zero character; unused remainder empty and filled with zeroes like: 107# {"keyslots":{"0":{"type":"luks2","key_size":64,"af":{"type":"luks1","stripes":4000,"hash":"sha256"},"area":{"type":"raw","offse" 108>0x1000 string x \b, at 0x1000 %s 109#>0x1000 indirect x 110# display information (like active) about LUKS1 slot 1110 name luks-slot 112# state of keyslot; 0x00AC71F3~active 0x0000DEAD~inactive 113#>0 ubelong x \b, status %#8.8x 114>0 ubelong =0x00AC71F3 active 115>0 ubelong =0x0000DEAD inactive 116# iteration parameter for PBKDF2 117#>4 ubelong x \b, %u iterations 118# salt parameter for PBKDF2 119#>8 ubequad x \b, salt %#16.16llx 120#>>16 ubequad x \b%16.16llx 121#>>24 ubequad x \b%16.16llx 122#>>32 ubequad x \b%16.16llx 123# start sector of key material like: 8 0x200 0x3f8 0x5f0 0xdd0 124>40 ubelong x \b, %#x material offset 125# number of anti-forensic stripes like: 4000 126>44 ubelong !4000 \b, %u stripes 127