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diff --git a/src/core/HibpDownloader.h b/src/core/HibpDownloader.h
new file mode 100644
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+++ b/src/core/HibpDownloader.h
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+/*
+ *  Copyright (C) 2020 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program 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 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSXC_HIBPDOWNLOADER_H
+#define KEEPASSXC_HIBPDOWNLOADER_H
+
+#include "config-keepassx.h"
+#include <QHash>
+#include <QObject>
+#include <QTimer>
+
+#ifndef WITH_XC_NETWORKING
+#error This file requires KeePassXC to be built with network support.
+#endif
+
+class QNetworkReply;
+
+/*
+ * Check if a password has been hacked by looking it up on the
+ * "Have I Been Pwned" website (https://haveibeenpwned.com/)
+ * in the background.
+ *
+ * Usage: Pass the password to check to the ctor and process
+ * the `finished` signal to get the result. Process the
+ * `failed` signal to handle errors.
+ */
+class HibpDownloader : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit HibpDownloader(QObject* parent = nullptr);
+    ~HibpDownloader() override;
+
+    void add(const QString& password);
+    void validate();
+    int passwordsToValidate() const;
+    int passwordsRemaining() const;
+
+signals:
+    void hibpResult(const QString& password, int count);
+    void fetchFailed(const QString& error);
+
+public slots:
+    void abort();
+
+private slots:
+    void fetchFinished();
+    void fetchReadyRead();
+
+private:
+    void fetchPassword(const QString& password);
+
+    QStringList m_pwdsToTry; // The list of remaining passwords to validate
+    QHash<QNetworkReply*, QPair<QString, QByteArray>> m_replies;
+};
+
+#endif // KEEPASSXC_HIBPDOWNLOADER_H