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diff --git a/src/gpg/function/GpgFileOpera.h b/src/gpg/function/GpgFileOpera.h
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+++ b/src/gpg/function/GpgFileOpera.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 GPGFRONTEND_GPGFILEOPERA_H
+#define GPGFRONTEND_GPGFILEOPERA_H
+
+#include "gpg/GpgConstants.h"
+#include "gpg/GpgContext.h"
+#include "gpg/GpgModel.h"
+
+namespace GpgFrontend {
+
+class GpgFileOpera : public SingletonFunctionObject<GpgFileOpera> {
+ public:
+  static GpgError EncryptFile(KeyListPtr keys, const std::string& path,
+                              GpgEncrResult& result);
+
+  static GpgError DecryptFile(const std::string& path, GpgDecrResult& result);
+
+  static GpgError SignFile(KeyListPtr keys, const std::string& path,
+                           GpgSignResult& result);
+
+  static GpgError VerifyFile(const std::string& path, GpgVerifyResult& result);
+
+  static GpgError EncryptSignFile(KeyListPtr keys, KeyListPtr signer_keys,
+                                  const std::string& path,
+                                  GpgEncrResult& encr_res,
+                                  GpgSignResult& sign_res);
+
+  static GpgError DecryptVerifyFile(const std::string& path,
+                                    GpgDecrResult& decr_res,
+                                    GpgVerifyResult& verify_res);
+};
+
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_GPGFILEOPERA_H