Go DTLS implementation

This is my work in progress DTLS implementation in pure Go. It is not working at all yet, except for the client DH_anon handshake.

Disclaimer: I'm very likely not qualified to write a secure implementation of DTLS. While I do not write custom crypto I don't have knowledge about how to prevent timing attacks etc. Aside from the fact that this implementation is generally not usable, I would also not recommend using it in any real projects even when it becomes theoretically usable.

TODO

• [x] Get encryption and decryption working for AES + SHA
• [x] Implement handshake fragment reassembly
• [ ] Implement handshake timeout
• [ ] Send multiple records in single datagram if possible
• [x] Handle out of order handshake messages
• [ ] Implement authenticated handshake
• [ ] Implement alert protocol
• [ ] Clean up the implementation
• [ ] Add tests
• [ ] Implement other cipher suites
• [ ] Maybe implement extensions
• [ ] Extend TODO list

Currently not supported

Well .. mostly everything, but especially:

• Session resumption
• Renegotiation