Hi Folks
Today I’ll tell you how you can implement crypto root with keyfile on your openSUSE
First you will need the following patch (tinkered together for my own setup):
http://ftp.o2s.ch/pub/patches/mkinitrd/crypto_root_luks_mkinitrd.patch

Then you’ll have to apply it and update your initrd:

sudo su
cd
wget http://ftp.o2s.ch/pub/patches/mkinitrd/crypto_root_luks_mkinitrd.patch
cd /
patch -p0 < /root/crypto_root_luks_mkinitrd.patch
mkinitrd -d /dev/mapper/root -f "udev dm storage luks lvm2" -m usb_storage

Next you add the new default boot parameters for grub in /etc/default/grub
In order to do so open the file and look for GRUB_CMDLINE_LINUX_DEFAULT
add the following variables in order to unlock your root partition at bootup
luks_root_keydev=UUID=?? luks_root_keyfile=?? luks_root=UUID=?? luks=root
(replace the ?? by values which fit your setup)