We just looking through some VPNs Unspyable uses SHA512 for hash function, AES256 for encryption, and RSA 4096 for handshake. Not sure where they are incorporated though. Their response to this question in Torrent Freak article is as fallows which sounds like they are avoiding the question.
>USA and UK VPN services are provided via our USA offices which also includes our billing system. Our offshore VPN network (Cyprus, Czech Republic, Hong Kong, Iceland, Netherlands, Norway, Panama, Russia, Sweden and Switzerland) is physically isolated from our USA operations and shares no connection to it.
Edit: also SHA512