Refactor Crypto/Utils lib to make it Linux compatible

src/Crypto/IPublicKeyAlgorithm.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstddef>
 
 class IPublicKeyAlgorithm
 {
@@ -18,4 +19,4 @@ public:
     // If needed add a signing method
 
     virtual bool Verify(const uint8_t* signedData, size_t signedDataSize, const uint8_t* signature, size_t signatureSize) = 0;
-};
+};