Update wolfSSL to the latest version(v.4.4.0) (#186)

* deleted old version wolfSSL before updating

* updated wolfSSL to the latest version(v4.4.0)

* updated wolfSSL to the latest version(v4.4.0)

* added macros for timing resistance

Co-authored-by: RichardBarry <3073890+RichardBarry@users.noreply.github.com>
Co-authored-by: Ming Yue <mingyue86010@gmail.com>

FreeRTOS-Plus/Source/WolfSSL/wrapper/python/wolfssl/README.rst

@@ -0,0 +1,96 @@
+Welcome
+=======
+
+``wolfssl Python`` is a Python module that encapsulates ``wolfssl C``, a `lightweight C-language-based SSL/TLS library <https://wolfssl.com/wolfSSL/Products-wolfssl.html>`_ targeted for embedded, RTOS, or
+resource-constrained environments primarily because of its small size, speed,
+and portability.
+
+Installation
+============
+
+In order to use ``wolfssl Python``, you'll also need to install ``wolfssl C``.
+
+Mac OSX
+-------
+
+Installing from ``homebrew`` and ``pip`` package managers:
+
+.. code-block:: shell
+
+    # wolfssl C installation
+    brew install wolfssl
+
+    # wolfssl Python installation
+    sudo -H pip install wolfssl
+
+Installing from ``source code``:
+
+.. code-block:: shell
+
+    # wolfssl C installation
+    git clone https://github.com/wolfssl/wolfssl.git
+    cd wolfssl/
+    ./autogen.sh
+    ./configure --enable-sha512
+    make
+    sudo make install
+
+    # wolfssl Python installation
+    cd wrapper/python/wolfssl
+    sudo make install
+
+
+Linux
+-----
+
+.. code-block:: shell
+
+    # dependencies installation
+    sudo apt-get update
+    sudo apt-get install -y git autoconf libtool
+    sudo apt-get install -y python-dev python3-dev python-pip libffi-dev
+
+    # wolfssl C installation
+    git clone https://github.com/wolfssl/wolfssl.git
+    cd wolfssl/
+    ./autogen.sh
+    ./configure --enable-sha512
+    make
+    sudo make install
+
+    sudo ldconfig
+
+    # wolfssl Python installation
+    sudo -H pip install wolfssl
+
+
+Testing
+=======
+
+To run the tox tests in the source code, you'll need ``tox`` and a few other
+requirements. The source code relies at **WOLFSSL_DIR/wrapper/python/wolfssl**
+where **WOLFSSL_DIR** is the path of ``wolfssl C``'s source code.
+
+1. Make sure that the testing requirements are installed:
+
+.. code-block:: shell
+
+    sudo -H pip install -r requirements-testing.txt
+
+
+2. Run ``make check``:
+
+.. code-block:: console
+
+    $ make check
+    ...
+    _________________________________ summary _________________________________
+    py27: commands succeeded
+    SKIPPED: py34: InterpreterNotFound: python3.4
+    py35: commands succeeded
+    py36: commands succeeded
+    congratulations :)
+
+Note: the test is performed using multiple versions of python. If you are
+missing a version the test will be skipped with an **InterpreterNotFound
+error**.