[dm-crypt] Basics

Mike Nagie promike1987 at gmail.com
Wed Sep 30 19:49:21 CEST 2015


Thanks Arno!

I thought it was just a bug, but now, it works  :)
I didn't really understand it. I thought it would generate 
a secure keyfile.
Now it's clean, thank you!

On 15-09-30 17:00:03, Arno Wagner wrote:
> You are using /dev/sdb1 as your keyfile. cryptsetup
> has a compiled-in size limit on keyfiles, which is
> per default 8kB. If /dev/sdb1 is larger, you get the
> error you observe.
> 
> Regards,
> Arno
> 
> 
> On Wed, Sep 30, 2015 at 14:16:26 CEST, Mike Nagie wrote:
> > Why is this happening? I'm trying to create encrypted luks partition 
> > with a keyfile.
> > 
> > cryptsetup luksFormat /dev/sda2 /dev/sdb1
> > 
> > WARNING!
> > This will overwrite data on /dev/sda2 irrevocably.
> > 
> > Are you sure? (Type uppercase yes): YES
> > Maximum keyfile size exceeded.
> > cryptsetup luksFormat /dev/sda2 /dev/sdb1 10.54s user 4.55s system 83% 
> > cpu 18.1
> > 
> > (and sometimes: command failed with code 22 invalid argument)
> > 
> > cryptsetup open --type luks /dev/sda2 home -d /dev/sdb1
> > Maximum keyfile size exceeded.
> > cryptsetup open --type luks /dev/sda2 home -d /dev/sdb1  10.43s user 
> > 4.64s system 99% cpu 15.103 total
> > -- 
> > You are so lucky!
> > _______________________________________________
> > dm-crypt mailing list
> > dm-crypt at saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt
> 
> -- 
> 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
> ----
> A good decision is based on knowledge and not on numbers. -- Plato
> 
> If it's in the news, don't worry about it.  The very definition of 
> "news" is "something that hardly ever happens." -- Bruce Schneier
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-- 
You are so lucky!


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