DigitalInfinity/ESP32-PaxCounter
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salt logic improved

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This commit is contained in:
Klaus K Wilting 2018-04-01 18:18:01 +02:00
parent ca75dee4f2
commit c1065193c6
3 changed files with 8 additions and 7 deletions
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4
src/globals.h
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@ -32,8 +32,8 @@ extern configData_t cfg;
extern uint8_t mydata[];
extern uint64_t uptimecounter;
extern osjob_t sendjob;
extern uint16_t macnum, blenum;
extern int countermode, screensaver, adrmode, lorasf, txpower, rlim, salt;
extern uint16_t macnum, blenum, salt;
extern int countermode, screensaver, adrmode, lorasf, txpower, rlim;
extern bool joinstate;
extern std::set<uint16_t> macs;

3
src/main.cpp
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@ -42,8 +42,7 @@ configData_t cfg; // struct holds current device configuration
osjob_t sendjob, initjob; // LMIC
// Initialize global variables
uint16_t macnum = 0, blenum = 0;
int salt;
uint16_t macnum = 0, blenum = 0, salt;
uint64_t uptimecounter = 0;
bool joinstate = false;

8
src/wifisniffer.cpp
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@ -74,8 +74,10 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
vendor2int = ( (uint32_t)hdr->addr2[2] ) | ( (uint32_t)hdr->addr2[1] << 8 ) | ( (uint32_t)hdr->addr2[0] << 16 );
if ( std::find(vendors.begin(), vendors.end(), vendor2int) != vendors.end() ) {
#endif
// salt and hash MAC, and if new unique one, store hash in container and increment counter on display
addr2int |= salt << 12; // prepend salt value to MAC before hashing it
// salt and hash MAC, and if new unique one, store identifier in container and increment counter on display
// https://en.wikipedia.org/wiki/MAC_Address_Anonymization
addr2int |= (uint64_t) salt << 48;
itoa(addr2int, macbuf, 10); // convert 64 bit MAC to base 10 decimal string
hashedmac = rokkit(macbuf, 5); // hash MAC for privacy, use 5 chars to fit in uint16_t container
newmac = macs.insert(hashedmac); // store hashed MAC if new unique
@ -83,7 +85,7 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
macnum++; // increment MAC counter
itoa(macnum, counter, 10); // base 10 decimal counter value
u8x8.draw2x2String(0, 0, counter);
ESP_LOGI(TAG, "#%05i: RSSI %04d -> Hash %05u", macnum, ppkt->rx_ctrl.rssi, hashedmac);
ESP_LOGI(TAG, "#%05i: RSSI %04d -> Hash %04x", macnum, ppkt->rx_ctrl.rssi, hashedmac);
}
#ifdef VENDORFILTER