Cryptography

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

.. note:: This version is not yet released and is under active development.

* **BACKWARDS INCOMPATIBLE:** Support for OpenSSL less than 1.1.1e has been
removed. Users on older version of OpenSSL will need to upgrade.
* **BACKWARDS INCOMPATIBLE:** Dropped support for LibreSSL < 3.8.
* Updated the minimum supported Rust version (MSRV) to 1.65.0, from 1.63.0.
* :func:`~cryptography.hazmat.primitives.asymmetric.rsa.generate_private_key`
now enforces a minimum RSA key size of 1024-bit. Note that 1024-bit is still
considered insecure, users should generally use a key size of 2048-bits.
* Added new :doc:`/hazmat/decrepit/index` module which contains outdated and
insecure cryptographic primitives.
:class:`~cryptography.hazmat.primitives.ciphers.algorithms.CAST5`,
:class:`~cryptography.hazmat.primitives.ciphers.algorithms.SEED`,
:class:`~cryptography.hazmat.primitives.ciphers.algorithms.IDEA`, and
:class:`~cryptography.hazmat.primitives.ciphers.algorithms.Blowfish`, which were
deprecated in 37.0.0, have been added to this module. They will be removed
from the ``cipher`` module in 45.0.0.
* Moved :class:`~cryptography.hazmat.primitives.ciphers.algorithms.TripleDES`
and :class:`~cryptography.hazmat.primitives.ciphers.algorithms.ARC4` into
:doc:`/hazmat/decrepit/index` and deprecated them in the ``cipher`` module.
They will be removed from the ``cipher`` module in 48.0.0.
* Added support for deterministic
:class:`~cryptography.hazmat.primitives.asymmetric.ec.ECDSA` (:rfc:`6979`)
* Added support for client certificate verification to the
:mod:`X.509 path validation <cryptography.x509.verification>` APIs in the
form of :class:`~cryptography.x509.verification.ClientVerifier`,
:class:`~cryptography.x509.verification.VerifiedClient`, and
``PolicyBuilder``
:meth:`~cryptography.x509.verification.PolicyBuilder.build_client_verifier`.
* Added Certificate
:attr:`~cryptography.x509.Certificate.public_key_algorithm_oid`
and Certificate Signing Request
:attr:`~cryptography.x509.CertificateSigningRequest.public_key_algorithm_oid`
to determine the :class:`~cryptography.hazmat._oid.PublicKeyAlgorithmOID`
Object Identifier of the public key found inside the certificate.
* Added :attr:`~cryptography.x509.InvalidityDate.invalidity_date_utc`, a
timezone-aware alternative to the naïve ``datetime`` attribute
:attr:`~cryptography.x509.InvalidityDate.invalidity_date`.

.. _v42-0-7:

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

* Restored Windows 7 compatibility for our pre-built wheels. Note that we do
not test on Windows 7 and wheels for our next release will not support it.
Microsoft no longer provides support for Windows 7 and users are encouraged
to upgrade.

.. _v42-0-6:

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

* Fixed compilation when using LibreSSL 3.9.1.

.. _v42-0-5:

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

* Limit the number of name constraint checks that will be performed in
:mod:`X.509 path validation <cryptography.x509.verification>` to protect
against denial of service attacks.
* Upgrade ``pyo3`` version, which fixes building on PowerPC.

.. _v42-0-4:

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

* Fixed a null-pointer-dereference and segfault that could occur when creating
a PKCS12 bundle. Credit to **Alexander-Programming** for reporting the
issue. **CVE-2024-26130**
* Fixed ASN.1 encoding for PKCS7/SMIME signed messages. The fields ``SMIMECapabilities``
and ``SignatureAlgorithmIdentifier`` should now be correctly encoded according to the
definitions in :rfc:`2633` :rfc:`3370`.

.. _v42-0-3:

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

* Fixed an initialization issue that caused key loading failures for some
users.

.. _v42-0-2: