create DH keys for SSU session directly

libi2pd/SSUSession.h

@@ -166,6 +166,7 @@ namespace transport
 			bool m_IsDataReceived;
 			std::unique_ptr<SignedData> m_SignedData; // we need it for SessionConfirmed only
 			std::map<uint32_t, std::shared_ptr<const i2p::data::RouterInfo> > m_RelayRequests; // nonce->Charlie
+			std::shared_ptr<i2p::crypto::DHKeys> m_DHKeysPair; // X - for client and Y - for server
 	};
 }
 }