ec25519-fhmqvc: some more handshake refactoring
ec25519-fhmqvc: some more handshake refactoring

fpletz/fastd,fpletz/fastd,rlei/fastd-android,fpletz/fastd,rlei/fastd-android,fpletz/fastd,fpletz/fastd,rlei/fastd-android,rlei/fastd-android,rlei/fastd-android