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diff --git a/lang/cpp/src/interfaces/passphraseprovider.h b/lang/cpp/src/interfaces/passphraseprovider.h
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+++ b/lang/cpp/src/interfaces/passphraseprovider.h
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+/*
+  interface/passphraseprovider.h - Interface for passphrase callbacks
+  Copyright (C) 2003,2004 Klarälvdalens Datakonsult AB
+
+  This file is part of GPGME++.
+
+  GPGME++ is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Library General Public
+  License as published by the Free Software Foundation; either
+  version 2 of the License, or (at your option) any later version.
+
+  GPGME++ 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 Library General Public License for more details.
+
+  You should have received a copy of the GNU Library General Public License
+  along with GPGME++; see the file COPYING.LIB.  If not, write to the
+  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+*/
+
+#ifndef __GPGMEPP_INTERFACES_PASSPHRASEPROVIDER_H__
+#define __GPGMEPP_INTERFACES_PASSPHRASEPROVIDER_H__
+
+namespace GpgME
+{
+
+class PassphraseProvider
+{
+public:
+    virtual ~PassphraseProvider() {}
+
+    virtual char *getPassphrase(const char *useridHint, const char *description,
+                                bool previousWasBad, bool &canceled) = 0;
+};
+
+} // namespace GpgME
+
+#endif // __GPGMEPP_INTERFACES_PASSPHRASEPROVIDER_H__