init

helper.h

@@ -0,0 +1,9 @@
+#ifndef HELPER_H
+#define HELPER_H
+
+void load_env(char const* path);
+int hex_to_bytes_upper(const char* hex, unsigned char* out, size_t out_size);
+char* byte_to_hex(unsigned char* bytes, size_t len);
+void cal_hmac(unsigned char* mac, char* message);
+
+#endif