Server to Hub Registration Server Communication

When first logging in, the server creates a socket connection. The hub registration server sends,

$Lock <lock> Pk=<pk>

<lock> is used to generate <key>
See Appendix A: Converting a Lock into a Key for how to compute the key from the lock.
<pk> is unused, but SG believes Pk stands for "private" or "public key".

The server must then respond with,

$Key <key>|<hubname>|<hubaddress[:hubport]>|<hubdescription>|<hubusers>|<hubshare>

<key> is computed as above.
<hubname> is the hubs's username.
<hubaddress[:hubport]> is the hubs's address. Optional :hubport if hub port is not 411.
<hubdescription> is the hubs's description.
<hubusers> is the total number of users in the hub.
<hubshare> is the total amount of data available in the hub (bytes).

Hub Registration Example:

	Server <-> Hub Registration Server Communication in DC. 04-29-2003. By Sid
	---------------------------------------------------------- 

	Hublist Registration
	---------------------- 
	R = hub registration server
	H = hub 

	H>R: Connection
	R>H: $Lock <lock> Pk=<pk>|
	H>R: $Key <key>|<hubname>|<hubaddress[:hubport]>|<hubdescription>|<hubusers>|<hubshare>|

	R>H: Connection Closed