| Method | startFactory | Check for public and private keys. | 
| Method | buildProtocol | Create an instance of the server side of the SSH protocol. | 
| Method | getPublicKeys | Called when the factory is started to get the public portions of the 
servers host keys.  Returns a dictionary mapping SSH key types to public 
key strings. | 
| Method | getPrivateKeys | Called when the factory is started to get the  private portions of the 
servers host keys.  Returns a dictionary mapping SSH key types to twisted.conch.ssh.keys.Keyobjects. | 
| Method | getPrimes | Called when the factory is started to get Diffie-Hellman generators and 
primes to use.  Returns a dictionary mapping number of bits to lists of 
tuple of (generator, prime). | 
| Method | getDHPrime | Return a tuple of (g, p) for a Diffe-Hellman process, with p being as 
close to bits bits as possible. | 
| Method | getService | Return a class to use as a service for the given transport. |