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diff --git a/src/core/model/GpgSubKey.h b/src/core/model/GpgSubKey.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_GPGSUBKEY_H
+#define GPGFRONTEND_GPGSUBKEY_H
+
+#include <boost/date_time.hpp>
+#include <string>
+
+#include "core/GpgConstants.h"
+
+namespace GpgFrontend {
+
+/**
+ * @brief
+ *
+ */
+class GpgSubKey {
+ public:
+  /**
+   * @brief
+   *
+   * @return std::string
+   */
+  [[nodiscard]] std::string GetID() const { return _subkey_ref->keyid; }
+
+  /**
+   * @brief
+   *
+   * @return std::string
+   */
+  [[nodiscard]] std::string GetFingerprint() const { return _subkey_ref->fpr; }
+
+  /**
+   * @brief
+   *
+   * @return std::string
+   */
+  [[nodiscard]] std::string GetPubkeyAlgo() const {
+    return gpgme_pubkey_algo_name(_subkey_ref->pubkey_algo);
+  }
+
+  /**
+   * @brief
+   *
+   * @return unsigned int
+   */
+  [[nodiscard]] unsigned int GetKeyLength() const {
+    return _subkey_ref->length;
+  }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsHasEncryptionCapability() const {
+    return _subkey_ref->can_encrypt;
+  }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsHasSigningCapability() const {
+    return _subkey_ref->can_sign;
+  }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsHasCertificationCapability() const {
+    return _subkey_ref->can_certify;
+  }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsHasAuthenticationCapability() const {
+    return _subkey_ref->can_authenticate;
+  }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsPrivateKey() const { return _subkey_ref->secret; }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsExpired() const { return _subkey_ref->expired; }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsRevoked() const { return _subkey_ref->revoked; }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsDisabled() const { return _subkey_ref->disabled; }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsSecretKey() const { return _subkey_ref->secret; }
+
+  /**
+   * @brief
+   *
+   * @return true
+   * @return false
+   */
+  [[nodiscard]] bool IsCardKey() const { return _subkey_ref->is_cardkey; }
+
+  /**
+   * @brief
+   *
+   * @return boost::posix_time::ptime
+   */
+  [[nodiscard]] boost::posix_time::ptime GetCreateTime() const {
+    return boost::posix_time::from_time_t(_subkey_ref->timestamp);
+  }
+
+  /**
+   * @brief
+   *
+   * @return boost::posix_time::ptime
+   */
+  [[nodiscard]] boost::posix_time::ptime GetExpireTime() const {
+    return boost::posix_time::from_time_t(_subkey_ref->expires);
+  }
+
+  /**
+   * @brief Construct a new Gpg Sub Key object
+   *
+   */
+  GpgSubKey() = default;
+
+  /**
+   * @brief Construct a new Gpg Sub Key object
+   *
+   * @param subkey
+   */
+  explicit GpgSubKey(gpgme_subkey_t subkey);
+
+  /**
+   * @brief Construct a new Gpg Sub Key object
+   *
+   * @param o
+   */
+  GpgSubKey(GpgSubKey&& o) noexcept { swap(_subkey_ref, o._subkey_ref); }
+
+  /**
+   * @brief Construct a new Gpg Sub Key object
+   *
+   */
+  GpgSubKey(const GpgSubKey&) = delete;
+
+  /**
+   * @brief
+   *
+   * @param o
+   * @return GpgSubKey&
+   */
+  GpgSubKey& operator=(GpgSubKey&& o) noexcept {
+    swap(_subkey_ref, o._subkey_ref);
+    return *this;
+  };
+
+  /**
+   * @brief
+   *
+   * @return GpgSubKey&
+   */
+  GpgSubKey& operator=(const GpgSubKey&) = delete;
+
+  /**
+   * @brief
+   *
+   * @param o
+   * @return true
+   * @return false
+   */
+  bool operator==(const GpgSubKey& o) const {
+    return GetFingerprint() == o.GetFingerprint();
+  }
+
+ private:
+  using SubkeyRefHandler =
+      std::unique_ptr<struct _gpgme_subkey,
+                      std::function<void(gpgme_subkey_t)>>;  ///<
+
+  SubkeyRefHandler _subkey_ref = nullptr;  ///<
+};
+
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_GPGSUBKEY_H