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+// Copyright (c) 2005-2019 Jay Berkenbilt
+//
+// This file is part of qpdf.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Versions of qpdf prior to version 7 were released under the terms
+// of version 2.0 of the Artistic License. At your option, you may
+// continue to consider qpdf to be licensed under those terms. Please
+// see the manual for additional information.
+
+#ifndef QPDFCRYPTOIMPL_HH
+#define QPDFCRYPTOIMPL_HH
+
+#include <qpdf/DLL.h>
+
+// This class is part of qpdf's pluggable crypto provider support.
+// Most users won't need to know or care about this class, but you can
+// use it if you want to supply your own crypto implementation. To do
+// so, provide an implementation of QPDFCryptoImpl, ensure that you
+// register it by calling QPDFCryptoProvider::registerImpl, and make
+// it the default by calling QPDFCryptoProvider::setDefaultProvider.
+
+class QPDF_DLL_CLASS QPDFCryptoImpl
+{
+ public:
+ QPDF_DLL
+ QPDFCryptoImpl() = default;
+
+ QPDF_DLL
+ virtual ~QPDFCryptoImpl() = default;
+};
+
+#endif // QPDFCRYPTOIMPL_HH