[dm-crypt] luks in java

[dm-crypt] luks in java

[Oscar]

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hey everybody! i am currently working on a java program capable of reading
data encrypted following the luks standard. I have read hundreds of pages of
documentation but i am still a little lost on how should i begin to attack
the problem. My first question is, how can i retrieve the luks "header" from
a partition using java? is it a fixed size header starting from sector 0?

thank you for your time,

oscar

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Re: [dm-crypt] luks in java

[Arno Wagner]

The Luks header starts from offset 0 in the LUKS partition.
You can basically open the partition for reading and read
it as if it was a file.

Arno



On Sat, Mar 27, 2010 at 01:11:04AM -0400, Oscar wrote:
> hey everybody! i am currently working on a java program capable of reading
> data encrypted following the luks standard. I have read hundreds of pages of
> documentation but i am still a little lost on how should i begin to attack
> the problem. My first question is, how can i retrieve the luks "header" from
> a partition using java? is it a fixed size header starting from sector 0?
> 
> thank you for your time,
> 
> oscar

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
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Re: [dm-crypt] luks in java

[Milan Broz]

On 03/27/2010 06:11 AM, Oscar wrote:
> hey everybody! i am currently working on a java program capable of
> reading data encrypted following the luks standard. I have read hundreds
> of pages of documentation but i am still a little lost on how should i
> begin to attack the problem. My first question is, how can i retrieve
> the luks "header" from a partition using java? is it a fixed size header
> starting from sector 0?

No, it is not. Only visible header is fixed size (starting on first sector),
but keyslot areas size depends on key size.
Read http://code.google.com/p/cryptsetup/wiki/Specification

Not sure what are you trying to do, but if it is going to be used
Linux, please use libcryptsetup shared lirary (from cryptsetup 1.1).
(So it is just about java bindings to library.)

There is already some Python bindigs for the cryptsetup btw.

If you plan to use it on Windows, check also FreeOTFE project.

Milan

Re: [dm-crypt] luks in java

[Oscar]

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thank you for your quick response. my idea was to work in something platform
independent, but now that you said that, would there be any advantages in
using the shared libraries? i mean, i know that it would be less coding and
that updates on the libraries would update the dependent packages too but,
besides that?

oscar

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