Adding 508 check

Author: RLeclair

examples/ECCX08HMAC/ECCX08HMAC.ino

@@ -22,9 +22,11 @@ byte data[] = {
     0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
     0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
     0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
-    0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10
+    0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+    0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+    0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
 };
-int dataLength = 56;
+int dataLength = 72;
 
 void setup() {
     Serial.begin(115200);

src/ECCX08.cpp

@@ -443,6 +443,12 @@ int ECCX08Class::lock()
 
 int ECCX08Class::beginHMAC(uint16_t keySlot)
 {
+  // HMAC implementation is only for ATECC608
+  long ver = version() & 0x0F00000;
+  if (ver != 0x0600000) {
+    return 0;
+  }
+
   uint8_t status;
 
   if (!wakeup()) {