Description:
Systems becomes unbootable if use non-luks drive encryption due to error in encrypt initcpio hook. The following message appears at each boot:
Verify parameter format: crypto=hash:cipher:keysize:offset:skip
Non-LUKS decryption not attempted...
even if valid encrypt arguments are provided.

Additional info:
* cryptsetup version is: 1.3.1-1
* kernel encrypt arguments are: cryptdevice=/dev/sda:hdd crypto=::::

Steps to reproduce:
Use non-luks encryption on root partition, use mkinitcpio to generate ramdisk with encrypt hook included, specify valid encrypt arguments in /boot/grub/menu.lst. Try to boot resultant system. Removing of the following code (line numbers included) from /lib/initcpio/hooks/encrypt resolves the problem:
87 if [ $# -ne 5 ]; then
88 err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip"
89 err "Non-LUKS decryption not attempted..."
90 return 1
91 fi