I just downloaded a copy of the Hamas Charter (
http://avalon.law.yale.edu/20th_century/hamas.asp) and searched for caliphate (one hit) and Israel (four hits). Pertinent sentences follow:
"They were behind World War I, when they were able to destroy the Islamic Caliphate, making financial gains and controlling resources."
"Israel will exist and will continue to exist until Islam will obliterate it, just as it obliterated others before it." The other three Israel hits do not mention its right to exist.
It also has this to say about other Islamic movements:
"The Islamic Resistance Movement views other Islamic movements with respect and appreciation. If it were at variance with them on one point or opinion, it is in agreement with them on other points and understandings. It considers these movements, if they reveal good intentions and dedication to Allah, that they fall into the category of those who are trying hard since they act within the Islamic circle. Each active person has his share."