[dm-crypt] LUKS Header crruption

["Konstantin V. Gavrilenko" <k.gavrilenko@arhont.com>]

Hi List,

as a result of executing a command from the history, after a reboot, when the disk letters were changed, I have accidentally overwritten the LUKS header with the raid superblock one :(

Now I can not open the cryptodisk with the "luksOpen" as it states the "No key available with this passphrase."


However, when I run "luksDump" the header information is available

# cryptsetup luksDump /dev/sdd1                                                                                                                                      
LUKS header information for /dev/sdd1

Version:        1
Cipher name:    aes
Cipher mode:    xts-plain64
Hash spec:      sha256
Payload offset: 4096
MK bits:        256
MK digest:      a6 a6 de 04 5a 19 9f 97 54 a9 79 bf f8 c1 37 89 69 44 34 76 
MK salt:        7a 0b 8e cc 68 06 35 ec 09 fc 5e f9 90 e3 c9 ef 
                8b 11 96 10 4c 25 ab 89 a1 48 df fe 6a 88 20 96 
MK iterations:  232809
UUID:           0f91c412-6f6a-405d-8040-5cc17ad17b47

Key Slot 0: ENABLED
        Iterations:             3724958
        Salt:                   c4 52 ac 04 59 8a d1 4f 7a 3c 5d e8 d3 50 1a c4 
                                11 20 0b 66 66 81 78 09 9f 7a f4 c1 dc 80 d4 40 
        Key material offset:    8
        AF stripes:             4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED



The RAID superblock that was written by mdadm is default, version 1.2	that is located 4K from the beginning of the device.


Providing that I have no backup of the original header and I know wht was written, is there a way to restore the header and get the data?


Konstantin