Update cryptography to 3.4.6

[pyup-bot]

This PR updates cryptography from 3.2.1 to 3.4.6.

Changelog

3.4.6

~~~~~~~~~~~~~~~~~~

* Updated Windows, macOS, and ``manylinux`` wheels to be compiled with
OpenSSL 1.1.1j.

.. _v3-4-5:

3.4.5

~~~~~~~~~~~~~~~~~~

* Various improvements to type hints.
* Lower the minimum supported Rust version (MSRV) to >=1.41.0. This change
improves compatibility with system-provided Rust on several Linux
distributions.
* ``cryptography`` will be switching to a new versioning scheme with its next
feature release. More information is available in our
:doc:`/api-stability` documentation.

.. _v3-4-4:

3.4.4

~~~~~~~~~~~~~~~~~~

* Added a ``py.typed`` file so that ``mypy`` will know to use our type
annotations.
* Fixed an import cycle that could be triggered by certain import sequences.

.. _v3-4-3:

3.4.3

~~~~~~~~~~~~~~~~~~

* Specify our supported Rust version (>=1.45.0) in our ``setup.py`` so users
on older versions will get a clear error message.

.. _v3-4-2:

3.4.2

~~~~~~~~~~~~~~~~~~

* Improvements to make the rust transition a bit easier. This includes some
better error messages and small dependency fixes. If you experience
installation problems **Be sure to update pip** first, then check the
:doc:`FAQ </faq>`.

.. _v3-4-1:

3.4.1

~~~~~~~~~~~~~~~~~~

* Fixed a circular import issue.
* Added additional debug output to assist users seeing installation errors
due to outdated ``pip`` or missing ``rustc``.

.. _v3-4:

3.4

~~~~~~~~~~~~~~~~

* **BACKWARDS INCOMPATIBLE:** Support for Python 2 has been removed.
* We now ship ``manylinux2014`` wheels and no longer ship ``manylinux1``
wheels. Users should upgrade to the latest ``pip`` to ensure this doesn't
cause issues downloading wheels on their platform.
* ``cryptography`` now incorporates Rust code. Users building ``cryptography``
themselves will need to have the Rust toolchain installed. Users who use an
officially produced wheel will not need to make any changes. The minimum
supported Rust version is 1.45.0.
* ``cryptography`` now has :pep:`484` type hints on nearly all of of its public
APIs. Users can begin using them to type check their code with ``mypy``.

.. _v3-3-2:

3.3.2

~~~~~~~~~~~~~~~~~~

* **SECURITY ISSUE:** Fixed a bug where certain sequences of ``update()`` calls
when symmetrically encrypting very large payloads (>2GB) could result in an
integer overflow, leading to buffer overflows. *CVE-2020-36242* **Update:**
This fix is a workaround for *CVE-2021-23840* in OpenSSL, fixed in OpenSSL
1.1.1j.

.. _v3-3-1:

3.3.1

~~~~~~~~~~~~~~~~~~

* Re-added a legacy symbol causing problems for older ``pyOpenSSL`` users.

.. _v3-3:

3.3

~~~~~~~~~~~~~~~~

* **BACKWARDS INCOMPATIBLE:** Support for Python 3.5 has been removed due to
low usage and maintenance burden.
* **BACKWARDS INCOMPATIBLE:** The
:class:`~cryptography.hazmat.primitives.ciphers.modes.GCM` and
:class:`~cryptography.hazmat.primitives.ciphers.aead.AESGCM` now require
64-bit to 1024-bit (8 byte to 128 byte) initialization vectors. This change
is to conform with an upcoming OpenSSL release that will no longer support
sizes outside this window.
* **BACKWARDS INCOMPATIBLE:** When deserializing asymmetric keys we now
raise ``ValueError`` rather than ``UnsupportedAlgorithm`` when an
unsupported cipher is used. This change is to conform with an upcoming
OpenSSL release that will no longer distinguish between error types.
* **BACKWARDS INCOMPATIBLE:** We no longer allow loading of finite field
Diffie-Hellman parameters of less than 512 bits in length. This change is to
conform with an upcoming OpenSSL release that no longer supports smaller
sizes. These keys were already wildly insecure and should not have been used
in any application outside of testing.
* Updated Windows, macOS, and ``manylinux`` wheels to be compiled with
OpenSSL 1.1.1i.
* Python 2 support is deprecated in ``cryptography``. This is the last release
that will support Python 2.
* Added the
:meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey.recover_data_from_signature`
function to
:class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey`
for recovering the signed data from an RSA signature.

.. _v3-2-1:

Links

• PyPI: https://pypi.org/project/cryptography
• Changelog: https://pyup.io/changelogs/cryptography/
• Repo: https://github.com/pyca/cryptography