[dm-crypt] Restore a LUKS partition

Arno Wagner arno at wagner.name
Thu Nov 21 16:44:58 CET 2013


Ok, whatever happened, /dev/sda6 is not a LUKS device. There 
is one hidden in there at offset 0x7e00 = 32256 though.
Looks like there was some LVM or other wrapper around it,

The crypsetup man page comments on this sutuation as follows:
"But note that when the LUKS header is at a nonzero offset 
 in a device, then  the  device  is  not  a LUKS device 
 anymore, but has a LUKS container stored in it at an offset."

I am not sure how to access this. Maybe something like
  losetup -o 32256 /dev/loop0 /dev/sda6
would work. If 
  cryptsetup -v isLuks /dev/loop0
woeks afterwards, than you might acces the container
this way. Also note that for LUKS you do not need
to specify cipher or hash (except when formating) as
they are stored in the LUKS header.

Arno



On Thu, Nov 21, 2013 at 09:11:49 CET, Michael Grosseck wrote:
> On 21.11.2013 02:57, Arno Wagner wrote:
> >hd /dev/sda6 | head
> thanks Arno for your reply, the command above gives me this output:
> 
> 00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> |................|
> *
> 000001b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 ef
> |................|
> 000001c0  ff ff 83 ef ff ff 3f 00  00 00 11 31 9c 00 00 00
> |......?....1....|
> 000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> |................|
> *
> 000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa
> |..............U.|
> 00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> |................|
> *
> 00007e00  4c 55 4b 53 ba be 00 01  62 6c 6f 77 66 69 73 68
> |LUKS....blowfish|
> 
> 
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-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
There are two ways of constructing a software design: One way is to make it
so simple that there are obviously no deficiencies, and the other way is to
make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.  --Tony Hoare


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