Re: [gentoo-amd64] Re: Using encrypted swap via cryptsetup-luks on amd64

[Jason Booth]

On Saturday 21 October 2006 21:26, Richard Freeman wrote:
> Duncan wrote:
> > I'm not running encrypted swap tho I've always thought it'd be nice to
> > setup /someday/, so I can't help directly.
>
> I just run the following script from local.start.  I forget where I
> found it online.  Obviously change the swapdevice variable!
>
> Honestly, my guess is that it is overly paranoid.  You could probably
> eliminate most of the steps this script takes, but it runs in only a
> second or two so it isn't a big deal.  I would leave in the bit that
> zeros the start of the encrypted swap partition - it probably helps to
> keep mkswap from getting confused.
>
> Not sure what the fancy scripts that are being discussed do, but this is
> plenty good for me, and I'm sure Duncan could get this running in about
> 15 seconds...

Yeah this script has worked fine for me for like 5 years except for one thing: 

I can't find which gentoo package contains uuencode(installed 
uucp,uulib,uudeview and googled to no avail).

>
> #!/bin/sh
> # Run this script somewhere in your startup scripts _after_ random
> # number generator has been initialized and /usr has been mounted.
> # (md5sum, uuencode, tail and head programs usually reside in /usr/bin/)
>
> # encrypted swap partition
> SWAPDEVICE=/dev/hda3
>
> # loop device name
> LOOPDEV=/dev/loop6
>
> MD=`dd if=${SWAPDEVICE} bs=4k count=10 2>/dev/null | md5sum`
> for X in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ; do
>     dd if=/dev/zero of=${SWAPDEVICE} bs=4k count=10 conv=notrunc
> 2>/dev/null sync
> done
> UR=`dd if=/dev/urandom bs=18 count=1 2>/dev/null \
>
>     | uuencode -m - | head -n 2 | tail -n 1`
>
> echo ${MD}${UR} | losetup -p 0 -e aes-cbc-256  ${LOOPDEV} ${SWAPDEVICE}
> MD=
> UR=
> dd if=/dev/zero of=${LOOPDEV} bs=4k count=10 conv=notrunc 2>/dev/null
> sync
> mkswap ${LOOPDEV}
> sync
> swapon ${LOOPDEV}
Thanks,
Jason

-- 
 gpg public key: http://lazybird.hyperintelligent.net/~jbooth/jbooth_key.asc
-- 
gentoo-amd64@gentoo.org mailing list