+/**
+ * Get the size of the header session, for all registered drivers.
+ *
+ * @return
+ * Size of the symmetric eader session.
+ */
+unsigned int
+rte_cryptodev_sym_get_header_session_size(void);
+
+/**
+ * Get the size of the private symmetric session data
+ * for a device.
+ *
+ * @param dev_id The device identifier.
+ *
+ * @return
+ * - Size of the private data, if successful
+ * - 0 if device is invalid or does not have private
+ * symmetric session
+ */
+unsigned int
+rte_cryptodev_sym_get_private_session_size(uint8_t dev_id);
+