Cryptography

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

* Disable blinding on RSA public keys to address an error with some versions
of OpenSSL.

.. _v3-2:

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

* **SECURITY ISSUE:** Attempted to make RSA PKCS1v1.5 decryption more constant
time, to protect against Bleichenbacher vulnerabilities. Due to limitations
imposed by our API, we cannot completely mitigate this vulnerability and a
future release will contain a new API which is designed to be resilient to
these for contexts where it is required. Credit to **Hubert Kario** for
reporting the issue. *CVE-2020-25659*
* Support for OpenSSL 1.0.2 has been removed. Users on older version of OpenSSL
will need to upgrade.
* Added basic support for PKCS7 signing (including SMIME) via
:class:`~cryptography.hazmat.primitives.serialization.pkcs7.PKCS7SignatureBuilder`.

.. _v3-1-1:

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

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

.. _v3-1:

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

* **BACKWARDS INCOMPATIBLE:** Removed support for ``idna`` based
:term:`U-label` parsing in various X.509 classes. This support was originally
deprecated in version 2.1 and moved to an extra in 2.5.
* Deprecated OpenSSL 1.0.2 support. OpenSSL 1.0.2 is no longer supported by
the OpenSSL project. The next version of ``cryptography`` will drop support
for it.
* Deprecated support for Python 3.5. This version sees very little use and will
be removed in the next release.
* ``backend`` arguments to functions are no longer required and the
default backend will automatically be selected if no ``backend`` is provided.
* Added initial support for parsing certificates from PKCS7 files with
:func:`~cryptography.hazmat.primitives.serialization.pkcs7.load_pem_pkcs7_certificates`
and
:func:`~cryptography.hazmat.primitives.serialization.pkcs7.load_der_pkcs7_certificates`
.
* Calling ``update`` or ``update_into`` on
:class:`~cryptography.hazmat.primitives.ciphers.CipherContext` with ``data``
longer than 2\ :sup:`31` bytes no longer raises an ``OverflowError``. This
also resolves the same issue in :doc:`/fernet`.

.. _v3-0:

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

* **BACKWARDS INCOMPATIBLE:** Removed support for passing an
:class:`~cryptography.x509.Extension` instance to
:meth:`~cryptography.x509.AuthorityKeyIdentifier.from_issuer_subject_key_identifier`,
as per our deprecation policy.
* **BACKWARDS INCOMPATIBLE:** Support for LibreSSL 2.7.x, 2.8.x, and 2.9.0 has
been removed (2.9.1+ is still supported).
* **BACKWARDS INCOMPATIBLE:** Dropped support for macOS 10.9, macOS users must
upgrade to 10.10 or newer.
* **BACKWARDS INCOMPATIBLE:** RSA
:meth:`~cryptography.hazmat.primitives.asymmetric.rsa.generate_private_key`
no longer accepts ``public_exponent`` values except 65537 and 3 (the latter
for legacy purposes).
* **BACKWARDS INCOMPATIBLE:** X.509 certificate parsing now enforces that the
``version`` field contains a valid value, rather than deferring this check
until :attr:`~cryptography.x509.Certificate.version` is accessed.
* Deprecated support for Python 2. At the time there is no time table for
actually dropping support, however we strongly encourage all users to upgrade
their Python, as Python 2 no longer receives support from the Python core
team.

If you have trouble suppressing this warning in tests view the :ref:`FAQ
entry addressing this issue <faq-howto-handle-deprecation-warning>`.

* Added support for ``OpenSSH`` serialization format for
``ec``, ``ed25519``, ``rsa`` and ``dsa`` private keys:
:func:`~cryptography.hazmat.primitives.serialization.load_ssh_private_key`
for loading and
:attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.OpenSSH`
for writing.
* Added support for ``OpenSSH`` certificates to
:func:`~cryptography.hazmat.primitives.serialization.load_ssh_public_key`.
* Added :meth:`~cryptography.fernet.Fernet.encrypt_at_time` and
:meth:`~cryptography.fernet.Fernet.decrypt_at_time` to
:class:`~cryptography.fernet.Fernet`.
* Added support for the :class:`~cryptography.x509.SubjectInformationAccess`
X.509 extension.
* Added support for parsing
:class:`~cryptography.x509.SignedCertificateTimestamps` in OCSP responses.
* Added support for parsing attributes in certificate signing requests via
``CertificateSigningRequest.get_attribute_for_oid``.
* Added support for encoding attributes in certificate signing requests via
:meth:`~cryptography.x509.CertificateSigningRequestBuilder.add_attribute`.
* On OpenSSL 1.1.1d and higher ``cryptography`` now uses OpenSSL's
built-in CSPRNG instead of its own OS random engine because these versions of
OpenSSL properly reseed on fork.
* Added initial support for creating PKCS12 files with
:func:`~cryptography.hazmat.primitives.serialization.pkcs12.serialize_key_and_certificates`.

.. _v2-9-2:

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

* Updated the macOS wheel to fix an issue where it would not run on macOS
versions older than 10.15.

.. _v2-9-1: