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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page ssl.html
\title Secure Sockets Layer (SSL) Classes
\brief Classes for secure communication over network sockets.
\keyword SSL
The classes below provide support for secure network communication using
the Secure Sockets Layer (SSL) protocol, using the \l{OpenSSL Toolkit}
to perform encryption and protocol handling.
From Qt version 5.6 onwards, the officially supported version for OpenSSL
is 1.0.0 or later.
\annotatedlist ssl
\section1 Enabling and Disabling SSL Support
When building Qt from source, the configuration system checks for the presence
of the \c{openssl/opensslv.h} header provided by source or developer packages
of OpenSSL.
By default, an SSL-enabled Qt library dynamically loads any installed OpenSSL
library at run-time. However, it is possible to link against the library at
compile-time by configuring Qt with the \c{-openssl-linked} option.
When building a version of Qt linked against OpenSSL, the build system will
attempt to link with libssl and libcrypt libraries located in the default
location on the developer's system. This location is configurable:
set the \c OPENSSL_LIBS environment variable to contain the linker options
required to link Qt against the installed library. For example, on a Unix/Linux
system:
\code
OPENSSL_LIBS='-L/opt/ssl/lib -lssl -lcrypto' ./configure -openssl-linked
\endcode
To disable SSL support in a Qt build, configure Qt with the \c{-no-openssl}
option.
\section1 Datagram Transport Layer Security
Datagram Transport Layer Security (DTLS) is a protocol that enables security
for datagram-based applications, providing them with protection against
eavesdropping, tampering, or message forgery. The DTLS protocol is based on the
stream-oriented Transport Layer Security (TLS) protocol. QtNetwork enables
the use of DTLS with User Datagram Protocol (UDP), as defined by
\l {https://tools.ietf.org/html/rfc6347}{RFC 6347}.
\section1 Import and Export Restrictions
Qt binary installers include the OpenSSL libraries used by QtNetwork. However,
those are not automatically deployed with applications that are built with Qt.
Import and export restrictions apply for some types of software, and for
some parts of the world. Developers wishing to use SSL communication in their
deployed applications should either ensure that their users have the appropriate
libraries installed, or they should consult a suitably qualified legal
professional to ensure that applications using code from the OpenSSL project
are correctly certified for import and export in relevant regions of the world.
*/
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