created first version with hash

platformio.ini

@@ -70,7 +70,9 @@ board = esp32dev
 framework = arduino
 monitor_baud = 115200
 upload_speed = 921600
-lib_deps = U8g2
+lib_deps = 
+    U8g2
+    ESP32 BLE Arduino@>=0.4.9
 build_flags = 
 ;set log level, we need build_flag for this, otherwise we can't use ESP_LOGx in arduino framework
     -DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_VERBOSE

src/globals.h

@@ -34,7 +34,7 @@ extern uint64_t uptimecounter;
 extern osjob_t sendjob;
 extern int macnum, blenum, countermode, screensaver, adrmode, lorasf, txpower, rlim;
 extern bool joinstate;
-extern std::set<uint64_t> macs;
+extern std::set<uint32_t> macs; 
 
 #ifdef HAS_DISPLAY
     extern HAS_DISPLAY u8x8;

src/main.cpp

@@ -46,7 +46,7 @@ int macnum = 0, blenum = 0;
 uint64_t uptimecounter = 0;
 bool joinstate = false;
 
-std::set<uint64_t> macs; // associative container holds filtered MAC adresses
+std::set<uint32_t> macs; // associative container holds filtered MAC adresses
 
 // this variable will be changed in the ISR, and read in main loop
 static volatile bool ButtonTriggered = false;
@@ -67,7 +67,6 @@ void eraseConfig(void);
 void saveConfig(void);
 void loadConfig(void);
 
-
 /* begin LMIC specific parts ------------------------------------------------------------ */
 
 // LMIC enhanced Pin mapping 

src/main.h

@@ -1,5 +1,5 @@
 // program version
-#define PROGVERSION                     "1.2.53" // use max 10 chars here!
+#define PROGVERSION                     "1.2.54" // use max 10 chars here!
 #define PROGNAME                        "PAXCNT"
 
 // Verbose enables serial output

src/rokkithash.cpp

@@ -0,0 +1,75 @@
+/*
+Porting - 2014 Alex K
+Algorithm (c) Paul Hsieh http://www.azillionmonkeys.com/qed/hash.html
+
+
+The latest version of this library may be found at:
+  https://github.com/mrbio/Arduino-rokkit-hash
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <inttypes.h>
+
+uint32_t rokkit(const char * data, int len) {
+  uint32_t hash, tmp;
+  int rem;
+
+    if (len <= 0 || data == 0) return 0;
+    hash = len;
+    rem = len & 3;
+    len >>= 2;
+
+    /* Main loop */
+    while (len > 0) {
+        hash  += *((uint16_t*)data);
+        tmp    = (*((uint16_t*)(data+2)) << 11) ^ hash;
+        hash   = (hash << 16) ^ tmp;
+        data  += 2*2;
+        hash  += hash >> 11;
+		len--;
+    }
+
+    /* Handle end cases */
+    switch (rem) {
+        case 3: hash += *((uint16_t*)data);
+                hash ^= hash << 16;
+                hash ^= ((signed char)data[2]) << 18;
+                hash += hash >> 11;
+                break;
+        case 2: hash += *((uint16_t*)data);
+                hash ^= hash << 11;
+                hash += hash >> 17;
+                break;
+        case 1: hash += (signed char)*data;
+                hash ^= hash << 10;
+                hash += hash >> 1;
+    }
+
+    /* Force "avalanching" of final 127 bits */
+    hash ^= hash << 3;
+    hash += hash >> 5;
+    hash ^= hash << 4;
+    hash += hash >> 17;
+    hash ^= hash << 25;
+    hash += hash >> 6;
+
+    return hash;
+}

src/wifisniffer.cpp

@@ -14,6 +14,9 @@
 // Local logging tag
 static const char *TAG = "wifisniffer";
 
+// function defined in rokkithash.cpp
+uint32_t rokkit(const char * , int );
+
 static wifi_country_t wifi_country = {.cc=WIFI_MY_COUNTRY, .schan=WIFI_CHANNEL_MIN, .nchan=WIFI_CHANNEL_MAX, .policy=WIFI_COUNTRY_POLICY_MANUAL};
 
 typedef struct {
@@ -56,8 +59,10 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
 	const wifi_promiscuous_pkt_t *ppkt = (wifi_promiscuous_pkt_t *)buff;
 	const wifi_ieee80211_packet_t *ipkt = (wifi_ieee80211_packet_t *)ppkt->payload;
 	const wifi_ieee80211_mac_hdr_t *hdr = &ipkt->hdr;
-	char counter [10];
-	std::pair<std::set<uint64_t>::iterator, bool> newmac;
+	char counter [11]; // uint32_t -> 4 byte -> 10 decimals + '0' terminator -> 11 chars
+	char macbuf [21]; // uint64_t -> 8 byte -> 20 decimals + '0' terminator -> 21 chars
+	uint32_t hashedmac;
+	std::pair<std::set<uint32_t>::iterator, bool> newmac;
 
 	if (( cfg.rssilimit == 0 ) || (ppkt->rx_ctrl.rssi > cfg.rssilimit )) { // rssi is negative value
 	    uint64_t addr2int = ( (uint64_t)hdr->addr2[0] ) | ( (uint64_t)hdr->addr2[1] << 8 ) | ( (uint64_t)hdr->addr2[2] << 16 ) | \
@@ -69,17 +74,20 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
 		if ( std::find(vendors.begin(), vendors.end(), vendor2int) != vendors.end() ) {
 #endif
 		    
-			// INFO: RSSI when found MAC in range
+			// log rssi info for scanned MAC
 			ESP_LOGI(TAG, "WiFi RSSI: %02d", ppkt->rx_ctrl.rssi);
 
-			// if new unique MAC logged increment counter on display
-			newmac = macs.insert(addr2int);
+			// if found new unique MAC hash it and increment counter on display
+			itoa(addr2int, macbuf, 10); // convert 64 bit MAC to decimal string
+			hashedmac = rokkit(macbuf, 10); // hash MAC for privacy, use 10 chars to store in uint32_t set
+			newmac = macs.insert(hashedmac); // store hashed MAC if new unique
+			//if ( (newmac.second) && ((uint32_t)hdr->addr2[0] & 0x03 == 0) ) { // filter local and group MACs
 			if (newmac.second) {
 				macnum++;
-				itoa(macnum, counter, 10);
+				itoa(macnum, counter, 10); // 10 -> decimal counter value
 				u8x8.draw2x2String(0, 0, counter);
-				ESP_LOGI(TAG, "MAC counter: %4i", macnum);
-			}	
+				ESP_LOGI(TAG, "#%04i -> Hash %u", macnum, hashedmac);
+			}
 			
 #ifdef VENDORFILTER
 		}