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diff --git a/include/svl/PasswordHelper.hxx b/include/svl/PasswordHelper.hxx
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+++ b/include/svl/PasswordHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+
+#ifndef INCLUDED_SVL_PASSWORDHELPER_HXX
+#define INCLUDED_SVL_PASSWORDHELPER_HXX
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <svl/svldllapi.h>
+#include <sal/types.h>
+#include <com/sun/star/uno/Sequence.hxx>
+
+class SvPasswordHelper
+{
+    static void     GetHashPasswordLittleEndian(css::uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass);
+    static void     GetHashPasswordBigEndian(css::uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass);
+
+public:
+    SVL_DLLPUBLIC static void     GetHashPassword(css::uno::Sequence <sal_Int8>& rPassHash, const char* pPass, sal_uInt32 nLen);
+
+    SVL_DLLPUBLIC static void     GetHashPassword(css::uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass);
+    SVL_DLLPUBLIC static void     GetHashPasswordSHA1UTF8(css::uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass);
+    SVL_DLLPUBLIC static void     GetHashPasswordSHA256(css::uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass);
+    /**
+    Use this method to compare a given string with another given Hash value.
+    This is necessary, because in older versions exists different hashes of the same string. They were endian dependent.
+    We need this to handle old files. This method will compare against big and
+    little endian UTF-16.
+    tdf#115483: also check 2 different new ways of hashing that were added in
+    ODF 1.2, requiring UTF-8 encoding.
+    */
+    SVL_DLLPUBLIC static bool     CompareHashPassword(const css::uno::Sequence<sal_Int8>& rOldPassHash, std::u16string_view sNewPass);
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */