Add Visione backend foundation

common/Crypto.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+
+namespace visione::crypto
+{
+std::string sha256(const std::string &value);
+std::string randomNumericCode(int digits);
+std::string randomToken();
+std::string hashPassword(const std::string &password);
+bool verifyPassword(const std::string &password, const std::string &hash);
+std::string hashSecret(const std::string &secret);
+}  // namespace visione::crypto
+