Ncurses based replacement for askpass (related to cryptsetup).

debian: dpkg-buildpackage -b
non-debian: ./compile.sh
non-autotools: ./configure && make

post-build: coreutils, cryptsetup, libncurses5, libtinfo5
pre-build: debhelper, libncurses5-dev, libtinfo-dev, autoconf, automake
Recommends: openssh-server
Conflicts: dropbear

Plymouth may not like naskpass (never verified).
Do not use debian and dropbear during boot (broken initscript).

It's possible to disable naskpass temporary by adding a kernel command line paramter (cryptfallback).