DigitalInfinity/ESP32-PaxCounter
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Improved hash & salt

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This commit is contained in:
Charles 2018-04-05 14:33:30 +02:00
parent bc114e4d1f
commit 114651d8c0
1 changed files with 8 additions and 10 deletions
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18
src/macsniff.cpp
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@ -38,7 +38,8 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
uint16_t hashedmac;
// Only last 3 MAC Address bytes are used bay MAC Address Anonymization
addr2int = ( (uint32_t)paddr[3] ) | ( (uint32_t)paddr[4] << 8 ) | ( (uint32_t)paddr[5] << 16 );
// but since it's uint32 we take 4 bytes to avoid 1st value to be 0
addr2int = ( (uint32_t)paddr[2] ) | ( (uint32_t)paddr[3] << 8 ) | ( (uint32_t)paddr[4] << 16 ) | ( (uint32_t)paddr[5] << 24 );
#ifdef VENDORFILTER
vendor2int = ( (uint32_t)paddr[2] ) | ( (uint32_t)paddr[1] << 8 ) | ( (uint32_t)paddr[0] << 16 );
@ -49,9 +50,9 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
// 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 += (uint32_t) salt << 16; // add 16-bit salt to 24-bit MAC
addr2int += (uint32_t) salt; // add 16-bit salt to pseudo MAC
snprintf(buff, sizeof(buff), "%08X", addr2int); // convert unsigned 32-bit salted MAC to 8 digit hex string
hashedmac = rokkit(buff, 5); // hash MAC string, use 5 chars to fit hash in uint16_t container
hashedmac = rokkit(&buff[3], 5); // hash MAC last string value, use 5 chars to fit hash in uint16_t container
auto newmac = macs.insert(hashedmac); // add hashed MAC to total container if new unique
added = newmac.second ? true:false; // true if hashed MAC is unique in container
@ -67,13 +68,10 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
rgb_set_color(COLOR_NONE);
}
if (added) { // first time seen this WIFI or BLE MAC
ESP_LOGI(TAG, "%s RSSI %ddBi -> Hash %04X -> WiFi:%d BLE:%d %s",
typebuff, rssi, hashedmac,
(int) wifis.size(), (int) bles.size(), buff );
} else { // already seen WIFI or BLE MAC
ESP_LOGI(TAG, "%s RSSI %ddBi -> Hash %04X -> already seen", typebuff, rssi, hashedmac);
}
ESP_LOGI(TAG, "%s RSSI %ddBi -> MAC %s -> Hash %04X -> WiFi:%d BLE:%d %s",
typebuff, rssi, buff, hashedmac,
(int) wifis.size(), (int) bles.size(),
added ? "already seen" : "new");
#ifdef VENDORFILTER
} else {