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diff --git a/src/core/function/gpg/GpgKeyManager.h b/src/core/function/gpg/GpgKeyManager.h
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+/**
+ * Copyright (C) 2021 Saturneric
+ *
+ * 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.
+ *
+ * GpgFrontend 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 GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * All the source code of GpgFrontend was modified and released by
+ * Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#ifndef GPGFRONTEND_ZH_CN_TS_GPGKEYMANAGER_H
+#define GPGFRONTEND_ZH_CN_TS_GPGKEYMANAGER_H
+
+#include "core/GpgContext.h"
+#include "core/GpgFunctionObject.h"
+#include "core/GpgModel.h"
+
+namespace GpgFrontend {
+
+/**
+ * @brief
+ *
+ */
+class GpgKeyManager : public SingletonFunctionObject<GpgKeyManager> {
+ public:
+  /**
+   * @brief Construct a new Gpg Key Manager object
+   *
+   * @param channel
+   */
+  explicit GpgKeyManager(
+      int channel = SingletonFunctionObject::GetDefaultChannel())
+      : SingletonFunctionObject<GpgKeyManager>(channel) {}
+
+  /**
+   * @brief Sign a key pair(actually a certain uid)
+   * @param target target key pair
+   * @param uid target
+   * @param expires expire date and time of the signature
+   * @return if successful
+   */
+  bool SignKey(const GpgKey& target, KeyArgsList& keys, const std::string& uid,
+               const std::unique_ptr<boost::posix_time::ptime>& expires);
+
+  /**
+   * @brief
+   *
+   * @param key
+   * @param signature_id
+   * @return true
+   * @return false
+   */
+  bool RevSign(const GpgFrontend::GpgKey& key,
+               const GpgFrontend::SignIdArgsListPtr& signature_id);
+
+  /**
+   * @brief Set the Expire object
+   *
+   * @param key
+   * @param subkey
+   * @param expires
+   * @return true
+   * @return false
+   */
+  bool SetExpire(const GpgKey& key, std::unique_ptr<GpgSubKey>& subkey,
+                 std::unique_ptr<boost::posix_time::ptime>& expires);
+
+ private:
+  GpgContext& ctx_ =
+      GpgContext::GetInstance(SingletonFunctionObject::GetChannel());  ///<
+};
+
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_ZH_CN_TS_GPGKEYMANAGER_H