[dm-crypt] piping password to cryptsetup

ken gebser at mousecar.com
Thu Sep 18 09:29:22 CEST 2014

I don't know anything about yad, but here's what worked for me some 
years ago:

echo -n "passphrase" \
| cryptsetup --key-file="-" luksOpen /dev/sda5 name1

Replace /dev/sda5 with whatever the relevant device name is.

Let us know if this works for you.  (Hope it does.)


On 09/17/2014 08:29 PM frodowiz wrote:
> i have been to so many forums to find a solution to this. all the
> variations are confusing me and none are working.
> i am trying to pipe a passphrase to cryptsetup using yad.
>   pass1=`yad --form --title="Enter container passphrase" --height=50
> --width=350 --field=Password:H`
> then i strip out the pipe character present between yad variables
> pass="${pass1//|}"
> at this point the variable pass appears to be exactly what i want.
> later on i invoke cryptsetup with the passphrase variable piped to it.
> echo "$pass" | cryptsetup --cipher aes-xts-plain --key-size 512 --hash
> sha512 --iter-time 5000 --use-random luksFormat "$container" -
> after a moment, i see the device pop into the selection in my file
> manager then it dissapears.
> the funny thing is, i wrote a terminal only version using the same
> methods minus the yad things and it works fine(see attached)
> terminal version requires 3 confirmations YES, passphrase, passphrase.
> do i need to reproduce these confirmations even with a minus sign at the
> end of the cryptsetup line?
> if so, would echo "YES"$'\n'"$pass"$'\n'"$pass"'\n' do this?
> also, if i replace the echo "$pass" pipe with xterm -e cryptsetup.... it
> works fine. basically, i am not getting the password format piped
> correctly. ive seen 7 different variations on this pipe and nothing is
> working. its probably something with spaces but i am resorting to email
> to lower my bloodpressure. also avoiding forums to lower my heart rate :)
> thanks to anyone reading this.
> Erik
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