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diff --git a/src/nfc/checksum_p.h b/src/nfc/checksum_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CHECKSUM_P_H
+#define CHECKSUM_P_H
+
+// Copied from qbytearray.cpp
+// Modified to initialise the crc with 0x6363 instead of 0xffff and to not invert the final result.
+static const quint16 crc_tbl[16] = {
+    0x0000, 0x1081, 0x2102, 0x3183,
+    0x4204, 0x5285, 0x6306, 0x7387,
+    0x8408, 0x9489, 0xa50a, 0xb58b,
+    0xc60c, 0xd68d, 0xe70e, 0xf78f
+};
+
+quint16 qNfcChecksum(const char *data, uint len)
+{
+    register quint16 crc = 0x6363;
+    uchar c;
+    const uchar *p = reinterpret_cast<const uchar *>(data);
+    while (len--) {
+        c = *p++;
+        crc = ((crc >> 4) & 0x0fff) ^ crc_tbl[((crc ^ c) & 15)];
+        c >>= 4;
+        crc = ((crc >> 4) & 0x0fff) ^ crc_tbl[((crc ^ c) & 15)];
+    }
+    return crc;
+}
+
+#endif // CHECKSUM_P_H