The SILC Key Exchange (SKE) protocol interface. The SKE protocol
 is used to negotiate secret key material between two parties, to be used
 as session key or some other key. For example, when client connects to
 server SKE is performed to exchange public keys, and to generate the key
 that is then used as session key. Two clients can execute SKE as well
 two create secret key material for securing for example file transfer
 stream. This SKE implementation provides easy interface for application
 that wants to use SKE.