Don't instantiate singletons on resource-constrained hw

Author: facchinm

src/AES128.cpp

@@ -49,4 +49,6 @@ int AES128Class::runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t
   return 1;
 }
 
+#ifndef ARDUINO_ARCH_MEGAAVR
 AES128Class AES128;
+#endif

src/ArduinoBearSSL.h

@@ -33,10 +33,6 @@
 
 #include "BearSSLClient.h"
 #include "SHA1.h"
-#include "SHA256.h"
-#include "MD5.h"
-#include "AES128.h"
-#include "DES.h"
 
 class ArduinoBearSSLClass {
 public:

src/DES.cpp

@@ -49,4 +49,7 @@ int DESClass::runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t bl
   return 1;
 }
 
+
+#ifndef ARDUINO_ARCH_MEGAAVR
 DESClass DES;
+#endif

src/MD5.cpp

@@ -54,4 +54,6 @@ int MD5Class::end(uint8_t *digest)
   return 1;
 }
 
+#ifndef ARDUINO_ARCH_MEGAAVR
 MD5Class MD5;
+#endif

src/SHA256.cpp

@@ -54,4 +54,6 @@ int SHA256Class::end(uint8_t *digest)
   return 1;
 }
 
+#ifndef ARDUINO_ARCH_MEGAAVR
 SHA256Class SHA256;
+#endif