This is the standard archlinux encrypt hook extended to support multiple encrypted devices via cryptsetup= cryptsetup1= cryptsetup2= etc.

This hook also additionally supports unlocking via ssh with mkinitcpio-dropbear or mkinitcpio-tinyssh packages set up first.

Available via the aur here:

https://aur.archlinux.org/packages/cryptsetup-multidisk-ssh/