Added XTEA and Pearson Hashing.

Improved message encryption for RF24.

hal/transport/RF24/MyTransportRF24.cpp

@@ -19,10 +19,15 @@
 
 #include "drivers/RF24/RF24.h"
 
+
 #if defined(MY_RF24_ENABLE_ENCRYPTION)
 #include "drivers/AES/AES.cpp"
 AES RF24_aes;
 uint8_t RF24_dataenc[32] = {0};
+#elif defined(MY_RF24_ENABLE_XTEA)
+#include "drivers/XTEA/XTEA.cpp"
+XTEA RF24_xtea;
+uint8_t RF24_dataenc[32] = {0};
 #endif
 
 #if defined(MY_RX_MESSAGE_BUFFER_FEATURE)
@@ -74,6 +79,9 @@ bool transportInit(void)
 	RF24_aes.set_key(RF24_psk, 16);
 	// Make sure it is purged from memory when set
 	(void)memset(RF24_psk, 0, 16);
+#elif defined(MY_RF24_ENABLE_XTEA)
+	uint8_t key[16] = MY_RF24_XTEA_KEY;
+	RF24_xtea.setKey(key);
 #endif
 
 #if defined(MY_RX_MESSAGE_BUFFER_FEATURE)
@@ -104,6 +112,13 @@ bool transportSend(const uint8_t to, const void *data, const uint8_t len, const
 	//encrypt data
 	RF24_aes.cbc_encrypt(RF24_dataenc, RF24_dataenc, finalLength / 16);
 	return RF24_sendMessage(to, RF24_dataenc, finalLength, noACK);
+#elif defined(MY_RF24_ENABLE_XTEA)
+	// has to be adjusted, WIP!
+	RF24_xtea.setIV(0, 0);
+	const uint8_t finalLength = len > 16 ? 32 : 16;
+	//encrypt data
+	RF24_xtea.cbc_encrypt(RF24_dataenc, data, finalLength / 8);
+	return RF24_sendMessage(to, RF24_dataenc, finalLength, noACK);
 #else
 	return RF24_sendMessage(to, data, len, noACK);
 #endif
@@ -144,6 +159,13 @@ uint8_t transportReceive(void *data)
 	if (RF24_aes.cbc_decrypt((uint8_t *)data, (uint8_t *)data, len > 16 ? 2 : 1) != AES_SUCCESS) {
 		len = 0;
 	}
+#elif defined(MY_RF24_ENABLE_XTEA)
+	// has to be adjusted, WIP!
+	RF24_xtea.setIV(0, 0);
+	const uint8_t finalLength = len > 16 ? 32 : 16;
+	// decrypt data
+	RF24_xtea.cbc_decrypt((uint8_t*)(RF24_dataenc), (uint8_t*)(data), finalLength / 8);
+	(void)memcpy(data,RF24_dataenc,len);
 #endif
 	return len;
 }