Developer James Laird has reverse engineered Apple’s private AirPlay key, opening the door to third-party AirPlay-enabled AirPort Express emulators. In a blog post announcing the release of ShairPort, an open-source AirPort Express emulator, Laird explains that Apple used a public-key crypto scheme in the AirPort Express, hiding a private key inside. Laird ended up opening the AirPort Express, dumping the ROM, and reverse engineering the keys…