support for ena-eke-proxy, improved interface

components/ena/include/ena-exposure.h

@@ -239,6 +239,20 @@ ena_exposure_config_t *ena_exposure_default_config(void);
  */
 void ena_exposure_check(ena_beacon_t beacon, ena_temporary_exposure_key_t temporary_exposure_key);
 
+/**
+ * @brief find minimal key index of beacons for a certain timestamp
+ * 
+ * @param[in] timestamp              the timestamp to check against
+ */
+int ena_expore_check_find_min(uint32_t timestamp);
+
+/**
+ * @brief find maximum key index of beacons for a certain timestamp
+ * 
+ * @param[in] timestamp              the timestamp to check against
+ */
+int ena_expore_check_find_max(uint32_t timestamp);
+
 /**
  * @brief reads Temporary Exposue Key and check for exposures with all beacons
  * 

components/ena/include/ena-storage.h

@@ -59,7 +59,7 @@ typedef struct __attribute__((__packed__))
     uint32_t day;            // Day of the exposure, using UTC, encapsulated as the time of the beginning of that day.
     int typical_attenuation; // Aggregation of the attenuations of all of a given diagnosis key's beacons received during the scan, in dB.
     int min_attenuation;     // Minimum attenuation of all of a given diagnosis key's beacons received during the scan, in dB.
-    int duration_minutes;    //The duration of the exposure in minutes.
+    int duration_minutes;    // The duration of the exposure in minutes.
     int report_type;         // Type of diagnosis associated with a key.
 } ena_exposure_information_t;
 
@@ -113,6 +113,14 @@ uint32_t ena_storage_read_last_exposure_date(void);
  */
 void ena_storage_write_last_exposure_date(uint32_t timestamp);
 
+/**
+ * @brief       get number of stored TEKs
+ * 
+ * @return
+ *              total number of TEKs stored
+ */
+uint32_t ena_storage_tek_count(void);
+
 /**
  * @brief       get last stored TEK
  * 
@@ -123,6 +131,15 @@ void ena_storage_write_last_exposure_date(uint32_t timestamp);
  */
 uint32_t ena_storage_read_last_tek(ena_tek_t *tek);
 
+/**
+ * @brief       get stored TEK at given index
+ * 
+ * @param[in]   index       the index of the TEK to read
+ * @param[out]  tek         pointer to write TEK to
+ * 
+ */
+void ena_storage_get_tek(uint32_t index, ena_tek_t *tek);
+
 /**
  * @brief       store given TEK
  *