NfcWifiProtectedSetup created by Freundschaft - https://repl.it/E4HO/63

NfcWifiProtectedSetup.js

//parsing according to https://android.googlesource.com/platform/packages/apps/Nfc/+/master/src/com/android/nfc/NfcWifiProtectedSetup.java
//additions according to WIFi Alliance Wi-Fi Protected Setup Specification

//sample payload
var u8 = new Uint8Array([16,14,0,62,16,38,0,1,1,16,69,0,11,87,76,65,78,45,56,50,67,81,90,54,16,3,0,2,0,34,16,15,0,2,0,12,16,39,0,16,52,57,53,54,52,52,53,54,56,48,51,57,48,50,54,51,16,32,0,6,-1,-1,-1,-1,-1,-1]);

function bin2string(array){
	var result = "";
	for(var i = 0; i < array.length; ++i){
		result+= (String.fromCharCode(array[i]));
	}
	return result;
}

const CREDENTIAL_FIELD_ID = parseInt('0x100E', 16);
const SSID_FIELD_ID = parseInt('0x1045', 16);
const NETWORK_KEY_FIELD_ID  = parseInt('0x1027', 16);
const AUTH_TYPE_FIELD_ID  = parseInt('0x1003', 16);
const NETWORK_INDEX_ID  = parseInt('0x1026', 16);
const ENCRYPTION_TYPE_ID  = parseInt('0x100F', 16);
const MAC_ADDRESS_ID  = parseInt('0x1020', 16);

const AUTH_TYPE_OPEN = 0;
const AUTH_TYPE_WPA_PSK = parseInt('0x0002', 16);
const AUTH_TYPE_WPA_EAP =  parseInt('0x0008', 16);
const AUTH_TYPE_WPA2_EAP = parseInt('0x0010', 16);
const AUTH_TYPE_WPA2_PSK = parseInt('0x0020', 16);

const AUTH_TYPE_EXPECTED_SIZE = 2;

var position = 0;
var dv = new DataView(u8.buffer);
var fieldId = dv.getUint16(position);
position = position + 2;
var fieldSize = dv.getUint16(position) & 65535;
position = position + 2;
parseCredential(dv, fieldSize, position);

function parseCredential(payload, size, position){
  var result = {};
  var startPosition = position;
  while (position < startPosition + size) {
    var fieldId = payload.getUint16(position);
    position = position + 2;
    var fieldSize = payload.getUint16(position) & 65535;
    position = position + 2;
     // sanity check
    if (position + fieldSize > startPosition + size) {
      return null;
    }
    
    switch (fieldId){
      case SSID_FIELD_ID:
        result.ssid = bin2string(u8.slice(position, position + fieldSize));
        console.log('ssid: ' + result.ssid);
        break;
      case NETWORK_KEY_FIELD_ID:
        result.preSharedKey = bin2string(u8.slice(position, position + fieldSize));
        console.log('sharedkey: ' + result.preSharedKey);
        break;
      case AUTH_TYPE_FIELD_ID:
        if (fieldSize != AUTH_TYPE_EXPECTED_SIZE) {
          // corrupt data
          console.log('corrupt data');
          return null;
        }
        // BITWISE OR CHECK console.log(AUTH_TYPE_WPA_PSK | AUTH_TYPE_WPA2_PSK)
        var authType = payload.getUint16(position);
        
        if (authType & AUTH_TYPE_WPA_PSK || authType & AUTH_TYPE_WPA2_PSK) {
            result.authType = 'WPA_PSK';
        } else if (authType & AUTH_TYPE_WPA_EAP || authType & AUTH_TYPE_WPA2_EAP) {
            result.authType = 'WPA_EAP';
        } else if (authType & AUTH_TYPE_OPEN) {
            result.authType = 'NONE';
        }
        
        console.log('authtype: ' + result.authType);
        break;
      case NETWORK_INDEX_ID:
        var networkIndexId = payload.getUint8(position);
        console.log('networkIndexId: ' + networkIndexId);
        break;
      case ENCRYPTION_TYPE_ID:
        var encryptionTypeId = payload.getUint16(position);
        console.log('encryptionTypeId: ' + encryptionTypeId);
        break;
      case MAC_ADDRESS_ID:
        var macAddressId = u8.slice(position, position + fieldSize);
        console.log('macAddressId: ' + macAddressId.reduce(function(a, b){
          return a.toString(16) + ':' + b.toString(16);
        }));
        break;
      default:
        // unknown
        console.log(fieldId + ': fieldsize is ' + fieldSize);
        break;
    }
    position = position + fieldSize;
  }
}