[dm-crypt] Variable data offset for a LUKS volume that uses a detached header.

.. ink .. mhogomchungu at gmail.com
Tue Dec 22 13:00:08 CET 2015

Happy holidays everybody,

I am trying to create a LUKS volume with a detached header that has
data offset at sector 256 and things fail with
 an error that reads:

"Data offset for detached LUKS header must be either 0 or higher than
header size (4036 sectors)."

Is there a technical reason why this is so and is it possible to allow
other data offsets?

Reason for doing this is an attempt at having a detached LUKS header
capable of unlocking a VeraCrypt volume since
unlocking a VeraCrypt volume takes too long and its annoying.

Everything seems to be working except for the data offset since i cant
set it to 256 sectors through the library API.

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