Added XTEA and Pearson Hashing.

Improved message encryption for RF24.

drivers/CRC16/CRC16.cpp

@@ -0,0 +1,16 @@
+#include "CRC16.h"
+
+
+uint16_t CRC16::calcCRC(const void* data, uint16_t len) {
+	uint16_t _crc = 0xffff;
+	for (uint16_t i = 0; i < len; i++) {
+		_crc = _crc16_update(_crc, ((uint8_t*)data)[i]);
+	}
+	return _crc;
+}
+
+bool CRC16::checkCRC(uint16_t crc, const void* data, uint16_t len) {
+	return crc == calcCRC(data, len);
+}
+
+

drivers/CRC16/CRC16.h

@@ -0,0 +1,15 @@
+#ifndef _CRC16_H_
+#define _CRC16_H_
+
+#include <stdint.h>
+#include <util/crc16.h>
+
+
+class CRC16 {
+public:
+	uint16_t calcCRC(const void* data, uint16_t len);
+	inline bool checkCRC(uint16_t crc, const void* data, uint16_t len);
+};
+
+
+#endif /* _CRC16_H_ */