Cleaned up code and implemented encryption

code/code.ino

@@ -18,13 +18,12 @@ const byte micPin = A0;
 //byte unsigned address = 1;
 const byte address[6] = "00001";
 
-unsigned short key = 0;
+byte key = 97;
 byte unsigned screen = 0;
-const String seed = "1305b5cfa1a59e9789de"; // "random" seed ;)
-String password;
-bool mode = 0; // 0 = transmit, 1 = recieve, bool is 2 bytes less than byte :)
+const char seed[32] = "555bfda9ba33008ceba78321683ed8e"; // random seed, MUST BE 31 chars long
+char password[32];
+bool mode = 0; // 0 = transmit, 1 = recieve
 bool encryption = 1; // will the trafic be encrypted?
-byte value = 0;
 
 bool isScreenChanged = true; // we must display first time
 
@@ -43,11 +42,13 @@ byte decreaseButtonLast;
 void switchMode();
 void printOutput();
 void updatePassword();
+void encryptDecyptData();
 
 //short micValue = 337; 
 //const short micBaseline = 337;// 3.3v / 2 = 1.56v, 1.56/5*1024 = 337.
 
-short micValues[32];
+const byte micValuesLength = 16;
+short micValues[micValuesLength];
 
 void setup() {
   Serial.begin(9600);
@@ -63,7 +64,6 @@ void setup() {
   radio.setChannel(0x00);
   radio.setDataRate(RF24_250KBPS);
   switchMode(); //default is recieving
-  switchMode();
   //Setting up a LCD
   lcd.init();
   lcd.backlight();
@@ -74,14 +74,16 @@ void setup() {
 void loop() {
   switchMode();
   if (!mode) {// transmit
-    for (int i = 0; i < 32; i ++) {
+    for (int i = 0; i < micValuesLength; i ++) {
       micValues[i] = analogRead(micPin) << 2;
     }
+    encryptDecyptData();
     radio.write(micValues, 32);
   } else { // receive
     if (radio.available()) {
       radio.read(micValues, 32);
-      for (int i = 0; i < 32; i++) {
+      encryptDecyptData();
+      for (int i = 0; i < micValuesLength; i++) {
         PORTD = micValues[i];
       }
     }
@@ -171,5 +173,21 @@ void printOutput () {
 }
 
 void updatePassword() {
-  password = seed + key;
+  for (int i = 0; i < 31; i ++) {
+    password[i] = seed[i];
+  }
+  password[31] = (char)key;
+}
+
+void encryptDecyptData () {
+  for (int i = 0; i < micValuesLength; i ++) {
+    char localKey[2];
+    localKey[0] = password[2 * i];
+    localKey[1] = password[2 * i + 1];
+    Serial.print("Before:");
+    Serial.print(micValues[i]);
+    micValues[i] = micValues[i] ^ (short)localKey;
+    Serial.print(",After:");
+    Serial.println(micValues[i]);
+  }
 }