extern int send_key_changed(connection_t*, connection_t*);
extern int send_req_key(connection_t*, connection_t*);
extern int send_ans_key(connection_t*, connection_t*, char*);
extern int send_key_changed(connection_t*, connection_t*);
extern int send_req_key(connection_t*, connection_t*);
extern int send_ans_key(connection_t*, connection_t*, char*);