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diff --git a/lang/cpp/src/gpgsetexpirytimeeditinteractor.cpp b/lang/cpp/src/gpgsetexpirytimeeditinteractor.cpp
new file mode 100644
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+++ b/lang/cpp/src/gpgsetexpirytimeeditinteractor.cpp
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+/*
+  gpgsetexpirytimeeditinteractor.cpp - Edit Interactor to change the expiry time of an OpenPGP key
+  Copyright (C) 2007 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.
+*/
+
+#include "gpgsetexpirytimeeditinteractor.h"
+#include "error.h"
+
+#include <gpgme.h>
+
+#include <cstring>
+
+using std::strcmp;
+
+// avoid conflict (msvc)
+#ifdef ERROR
+# undef ERROR
+#endif
+
+using namespace GpgME;
+
+GpgSetExpiryTimeEditInteractor::GpgSetExpiryTimeEditInteractor(const std::string &t)
+    : EditInteractor(),
+      m_strtime(t)
+{
+
+}
+
+GpgSetExpiryTimeEditInteractor::~GpgSetExpiryTimeEditInteractor() {}
+
+// work around --enable-final
+namespace GpgSetExpiryTimeEditInteractor_Private
+{
+enum {
+    START = EditInteractor::StartState,
+    COMMAND,
+    DATE,
+    QUIT,
+    SAVE,
+
+    ERROR = EditInteractor::ErrorState
+};
+}
+
+const char *GpgSetExpiryTimeEditInteractor::action(Error &err) const
+{
+
+    using namespace GpgSetExpiryTimeEditInteractor_Private;
+
+    switch (state()) {
+    case COMMAND:
+        return "expire";
+    case DATE:
+        return m_strtime.c_str();
+    case QUIT:
+        return "quit";
+    case SAVE:
+        return "Y";
+    case START:
+    case ERROR:
+        return 0;
+    default:
+        err = Error::fromCode(GPG_ERR_GENERAL);
+        return 0;
+    }
+}
+
+unsigned int GpgSetExpiryTimeEditInteractor::nextState(unsigned int status, const char *args, Error &err) const
+{
+
+    static const Error GENERAL_ERROR  = Error::fromCode(GPG_ERR_GENERAL);
+    static const Error INV_TIME_ERROR = Error::fromCode(GPG_ERR_INV_TIME);
+
+    if (needsNoResponse(status)) {
+        return state();
+    }
+
+    using namespace GpgSetExpiryTimeEditInteractor_Private;
+
+    switch (state()) {
+    case START:
+        if (status == GPGME_STATUS_GET_LINE &&
+                strcmp(args, "keyedit.prompt") == 0) {
+            return COMMAND;
+        }
+        err = GENERAL_ERROR;
+        return ERROR;
+    case COMMAND:
+        if (status == GPGME_STATUS_GET_LINE &&
+                strcmp(args, "keygen.valid") == 0) {
+            return DATE;
+        }
+        err = GENERAL_ERROR;
+        return ERROR;
+    case DATE:
+        if (status == GPGME_STATUS_GET_LINE &&
+                strcmp(args, "keyedit.prompt") == 0) {
+            return QUIT;
+        } else if (status == GPGME_STATUS_GET_LINE &&
+                   strcmp(args, "keygen.valid")) {
+            err = INV_TIME_ERROR;
+            return ERROR;
+        }
+        err = GENERAL_ERROR;
+        return ERROR;
+    case QUIT:
+        if (status == GPGME_STATUS_GET_BOOL &&
+                strcmp(args, "keyedit.save.okay") == 0) {
+            return SAVE;
+        }
+        err = GENERAL_ERROR;
+        return ERROR;
+    case ERROR:
+        if (status == GPGME_STATUS_GET_LINE &&
+                strcmp(args, "keyedit.prompt") == 0) {
+            return QUIT;
+        }
+        err = lastError();
+        return ERROR;
+    default:
+        err = GENERAL_ERROR;
+        return ERROR;
+    }
+}