core: move away from db towards hash-based auth

src/core/Crypto.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <string>
+#include <string_view>
+#include <memory>
+#include <vector>
+#include <openssl/evp.h>
+
+class CCrypto {
+  public:
+    CCrypto();
+    ~CCrypto();
+
+    std::string sha256(const std::string& in);
+    std::string sign(const std::string& in);
+    bool        verifySignature(const std::string& in, const std::string& sig);
+
+  private:
+    EVP_PKEY*            m_evpPkey = nullptr;
+
+    bool                 genKey();
+    void                 readKey();
+    std::vector<uint8_t> toByteArr(const std::string_view& s);
+};
+
+inline std::unique_ptr<CCrypto> g_pCrypto;