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/wolfcrypt/docs/digest.rst

@@ -0,0 +1,71 @@
+Message Digests
+===============
+
+.. module:: wolfcrypt.hashes
+
+A **message digest** is the output of a **cryptographic hash function**
+containing a string of bytes created by a **one-way formula** using the
+original message as input.
+
+Message digests are designed to protect the integrity of a piece of data or
+media to detect changes and alterations to any part of a message.
+
+
+Hashing Classes
+---------------
+
+Interface
+~~~~~~~~~
+
+All Hashing Functions available in this module implements the following
+interface:
+
+.. autoclass:: _Hash
+    :members:
+
+SHA-1
+~~~~~
+
+.. attention::
+
+    NIST has deprecated SHA-1 in favor of the SHA-2 variants. New applications
+    are strongly suggested to use SHA-2 over SHA-1.
+
+.. autoclass:: Sha
+
+SHA-2 family
+~~~~~~~~~~~~
+
+.. autoclass:: Sha256
+
+
+.. autoclass:: Sha384
+
+
+.. autoclass:: Sha512
+
+
+Example
+-------
+
+.. doctest::
+
+    >>> from wolfcrypt.hashes import Sha256
+    >>>
+    >>> s = Sha256()
+    >>> s.update(b'wolf')
+    >>> s.update(b'crypt')
+    >>> s.digest()
+    b'\x96\xe0.{\x1c\xbc\xd6\xf1\x04\xfe\x1f\xdbFR\x02zU\x05\xb6\x86R\xb7\x00\x95\xc61\x8f\x9d\xce\r\x18D'
+    >>> s.hexdigest()
+    b'96e02e7b1cbcd6f104fe1fdb4652027a5505b68652b70095c6318f9dce0d1844'
+    >>>
+    >>> s.update(b'rocks')
+    >>> s.hexdigest()
+    b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'
+    >>>
+    >>> Sha256(b'wolfcryptrocks').hexdigest()
+    b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'
+    >>>
+    >>> Sha256.new(b'wolfcryptrocks').hexdigest()
+    b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'