Addressing comments

Author: RLeclair

examples/ECCX08HMAC/ECCX08HMAC.ino

@@ -12,6 +12,8 @@
 
 #include <ArduinoECCX08.h>
 
+#define TEMPKEY_SLOT 0xFFFF
+
 byte nonceKey[] = {
     0x10, 0x10, 0x10, 0x10
 };
@@ -47,7 +49,7 @@ void setup() {
     }
 
     // Starting HMAC operation on tempkey slot
-    if (!ECCX08.beginHMAC(0xFFFF)) {
+    if (!ECCX08.beginHMAC(TEMPKEY_SLOT)) {
         Serial.println("Failed to start HMAC operation.");
         while (1);
     }

src/ECCX08.cpp

@@ -444,13 +444,14 @@ int ECCX08Class::lock()
 int ECCX08Class::beginHMAC(uint16_t keySlot)
 {
   // HMAC implementation is only for ATECC608
-  long ver = version() & 0x0F00000;
-  if (ver != 0x0600000) {
+  uint8_t status;
+  long ecc608ver = 0x0600000;
+  long eccCurrVer = version() & 0x0F00000;
+  
+  if (eccCurVer != ecc608ver) {
     return 0;
   }
 
-  uint8_t status;
-
   if (!wakeup()) {
     return 0;
   }