begin work on crypto

src/mesh/CryptoEngine.cpp

@@ -0,0 +1,16 @@
+#include "CryptoEngine.h"
+#include "configuration.h"
+
+void CryptoEngine::setKey(size_t numBytes, const uint8_t *bytes)
+{
+    DEBUG_MSG("WARNING: Using stub crypto - all crypto is sent in plaintext!\n");
+}
+
+/**
+ * Encrypt a packet
+ *
+ * @param bytes is updated in place
+ */
+void CryptoEngine::encrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) {}
+
+void CryptoEngine::decrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) {}