One thing that comes to mind as a gotcha is that you don't have access to UNIX-style sockets under MacTCP. I would assume that most SSL / TLS libraries you find are written for a system with UNIX-style sockets.
The "GUSI" (Grand Unified Sockets Interface) library exists, and claims to give you something close enough to UNIX sockets under both MacTCP and native OpenTransport. Your mileage may vary.
It might end up easier to implement your own SSL / TLS directly on top of MacTCP streams.
The "GUSI" (Grand Unified Sockets Interface) library exists, and claims to give you something close enough to UNIX sockets under both MacTCP and native OpenTransport. Your mileage may vary.
It might end up easier to implement your own SSL / TLS directly on top of MacTCP streams.