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diff --git a/src/gpg/GpgConstants.h b/src/gpg/GpgConstants.h
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+/**
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Foobar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Foobar.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from gpg4usb-team.
+ * Their source code version also complies with GNU General Public License.
+ *
+ * The source code version of this software was modified and released
+ * by Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ */
+
+#ifndef GPG_CONSTANTS_H
+#define GPG_CONSTANTS_H
+
+#include "GpgFrontend.h"
+
+#include <gpg-error.h>
+#include <gpgme.h>
+
+#include <cassert>
+#include <functional>
+#include <memory>
+#include <string>
+
+const int RESTART_CODE = 1000;
+
+namespace GpgFrontend {
+
+using ByteArray = std::string;
+using ByteArrayPtr = std::unique_ptr<ByteArray>;
+using StdBypeArrayPtr = std::unique_ptr<ByteArray>;
+using BypeArrayRef = ByteArray&;
+using BypeArrayConstRef = const ByteArray&;
+using StringArgsPtr = std::unique_ptr<std::vector<std::string>>;
+using StringArgsRef = std::vector<std::string>&;
+
+using GpgError = gpgme_error_t;
+
+// Result Deletor
+struct _result_ref_deletor {
+  void operator()(void* _result) {
+    // if (_result != nullptr)
+    //   gpgme_result_unref(_result);
+  }
+};
+
+using GpgEncrResult =
+    std::unique_ptr<struct _gpgme_op_encrypt_result, _result_ref_deletor>;
+using GpgDecrResult =
+    std::unique_ptr<struct _gpgme_op_decrypt_result, _result_ref_deletor>;
+using GpgSignResult =
+    std::unique_ptr<struct _gpgme_op_sign_result, _result_ref_deletor>;
+using GpgVerifyResult =
+    std::unique_ptr<struct _gpgme_op_verify_result, _result_ref_deletor>;
+
+// Error Info Printer
+GpgError check_gpg_error(GpgError err);
+GpgError check_gpg_error(GpgError gpgmeError, const std::string& comment);
+gpg_err_code_t check_gpg_error_2_err_code(
+    gpgme_error_t err, gpgme_error_t predict = GPG_ERR_NO_ERROR);
+
+// Fingerprint
+std::string beautify_fingerprint(BypeArrayConstRef fingerprint);
+
+// File Operation
+std::string read_all_data_in_file(const std::string& path);
+bool write_buffer_to_file(const std::string& path,
+                          const std::string& out_buffer);
+
+std::string get_file_extension(const std::string& path);
+std::string get_only_file_name_with_path(const std::string& path);
+
+// Check
+int text_is_signed(BypeArrayRef text);
+
+class GpgConstants {
+ public:
+  static const char* PGP_CRYPT_BEGIN;
+  static const char* PGP_CRYPT_END;
+  static const char* PGP_SIGNED_BEGIN;
+  static const char* PGP_SIGNED_END;
+  static const char* PGP_SIGNATURE_BEGIN;
+  static const char* PGP_SIGNATURE_END;
+  static const char* GPG_FRONTEND_SHORT_CRYPTO_HEAD;
+};
+}  // namespace GpgFrontend
+
+#endif  // GPG_CONSTANTS_H