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diff --git a/src/gpg/function/BasicOperator.h b/src/gpg/function/BasicOperator.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_ZH_CN_TS_BASICOPERATOR_H
+#define GPGFRONTEND_ZH_CN_TS_BASICOPERATOR_H
+
+#include "gpg/GpgConstants.h"
+#include "gpg/GpgContext.h"
+#include "gpg/GpgFunctionObject.h"
+#include "gpg/GpgModel.h"
+
+namespace GpgFrontend {
+
+class BasicOperator : public SingletonFunctionObject<BasicOperator> {
+ public:
+  gpg_error_t Encrypt(KeyListPtr keys, BypeArrayRef in_buffer,
+                      ByteArrayPtr& out_buffer, GpgEncrResult& result);
+
+  gpgme_error_t EncryptSign(KeyListPtr keys, KeyListPtr signers,
+                            BypeArrayRef in_buffer, ByteArrayPtr& out_buffer,
+                            GpgEncrResult& encr_result,
+                            GpgSignResult& sign_result);
+
+  gpgme_error_t Decrypt(BypeArrayRef in_buffer, ByteArrayPtr& out_buffer,
+                        GpgDecrResult& result);
+
+  gpgme_error_t DecryptVerify(BypeArrayRef in_buffer, ByteArrayPtr& out_buffer,
+                              GpgDecrResult& decrypt_result,
+                              GpgVerifyResult& verify_result);
+
+  gpgme_error_t Verify(BypeArrayRef in_buffer, ByteArrayPtr& sig_buffer,
+                       GpgVerifyResult& result) const;
+
+  gpg_error_t Sign(KeyListPtr keys, BypeArrayRef in_buffer,
+                   ByteArrayPtr& out_buffer, gpgme_sig_mode_t mode,
+                   GpgSignResult& result);
+
+  void SetSigners(KeyArgsList& keys);
+
+  std::unique_ptr<KeyArgsList> GetSigners();
+
+ private:
+  GpgContext& ctx =
+      GpgContext::GetInstance(SingletonFunctionObject::GetDefaultChannel());
+};
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_ZH_CN_TS_BASICOPERATOR_H