[dm-crypt] Android dm-crypt implementation and GNU/Linux

Milan Broz gmazyland at gmail.com
Tue Apr 23 19:34:03 CEST 2013

On 20.4.2013 14:45, Hannes wrote:
> Hi everyone,
> I hope this is the right place to ask: I have a dualboot between Ubuntu
> Arm and Android on a mobile device of mine. The data-partition is
> encrypted using Android's builtin encryption and I'd like to share it
> with the Ubuntu.
> I have been searching quite a bit on the net, but I can't find answers
> onto whether this is possible and how. It seems to me that Android's
> dm-crypt implementation is custom (no LUKS...) and implemented in VolD.
> Am I right in assuming there is no way to make cryptsetup unlock the
> partition?


I am not sure what is Android exactly doing but it would be interesting
to check.

> And do you know of a standalone implementation that can decrypt the
> partition on a GNU/Linux system? I have come accross bruteforce attack
> program[1] that runs on a regular GNU/Linux, but I think that works
> directly on the footer of the partition and doesn't have any magic
> beyond that.

My plan is to provide better support for low-level metadata parsers
(like LUKS) for not only Linux but also other OS.
This will take some time but I am definitely interested to provide
some code for Android if possible.

Please can you create issue (enhancement request) on project page
so we will not forget about it? Thanks.

> I thought a standalone implementation should exist somewhere, as it
> seems unlikely the implementation was developed inside Android's VolD.

Not sure about Android but there is already several other implementations
of LUKS. No problem with it but I would prefer upstream cryptsetup can
provide something usable.


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