Cryptography

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

* Support for OpenSSL 1.0.0 has been removed. Users on older version of OpenSSL
will need to upgrade.
* Added support for Diffie-Hellman key exchange using
:meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey.exchange`.
* The OS random engine for OpenSSL has been rewritten to improve compatibility
with embedded Python and other edge cases. More information about this change
can be found in the
`pull request <https://github.com/pyca/cryptography/pull/3229>`_.


.. _v1-6:

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

* Deprecated support for OpenSSL 1.0.0. Support will be removed in
``cryptography`` 1.7.
* Replaced the Python-based OpenSSL locking callbacks with a C version to fix
a potential deadlock that could occur if a garbage collection cycle occurred
while inside the lock.
* Added support for :class:`~cryptography.hazmat.primitives.hashes.BLAKE2b` and
:class:`~cryptography.hazmat.primitives.hashes.BLAKE2s` when using OpenSSL
1.1.0.
* Added
:attr:`~cryptography.x509.Certificate.signature_algorithm_oid` support to
:class:`~cryptography.x509.Certificate`.
* Added
:attr:`~cryptography.x509.CertificateSigningRequest.signature_algorithm_oid`
support to :class:`~cryptography.x509.CertificateSigningRequest`.
* Added
:attr:`~cryptography.x509.CertificateRevocationList.signature_algorithm_oid`
support to :class:`~cryptography.x509.CertificateRevocationList`.
* Added support for :class:`~cryptography.hazmat.primitives.kdf.scrypt.Scrypt`
when using OpenSSL 1.1.0.
* Added a workaround to improve compatibility with Python application bundling
tools like ``PyInstaller`` and ``cx_freeze``.
* Added support for generating a
:meth:`~cryptography.x509.random_serial_number`.
* Added support for encoding ``IPv4Network`` and ``IPv6Network`` in X.509
certificates for use with :class:`~cryptography.x509.NameConstraints`.
* Added :meth:`~cryptography.x509.Name.public_bytes` to
:class:`~cryptography.x509.Name`.
* Added :class:`~cryptography.x509.RelativeDistinguishedName`
* :class:`~cryptography.x509.DistributionPoint` now accepts
:class:`~cryptography.x509.RelativeDistinguishedName` for
:attr:`~cryptography.x509.DistributionPoint.relative_name`.
Deprecated use of :class:`~cryptography.x509.Name` as
:attr:`~cryptography.x509.DistributionPoint.relative_name`.
* :class:`~cryptography.x509.Name` now accepts an iterable of
:class:`~cryptography.x509.RelativeDistinguishedName`. RDNs can
be accessed via the :attr:`~cryptography.x509.Name.rdns`
attribute. When constructed with an iterable of
:class:`~cryptography.x509.NameAttribute`, each attribute becomes
a single-valued RDN.
* Added
:func:`~cryptography.hazmat.primitives.asymmetric.ec.derive_private_key`.
* Added support for signing and verifying RSA, DSA, and ECDSA signatures with
:class:`~cryptography.hazmat.primitives.asymmetric.utils.Prehashed`
digests.


.. _v1-5-3:

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

* **SECURITY ISSUE**: Fixed a bug where ``HKDF`` would return an empty
byte-string if used with a ``length`` less than ``algorithm.digest_size``.
Credit to **Markus Döring** for reporting the issue. *CVE-2016-9243*


.. _v1-5-2:

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

* Updated Windows and OS X wheels to be compiled against OpenSSL 1.0.2j.


.. _v1-5-1:

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

* Updated Windows and OS X wheels to be compiled against OpenSSL 1.0.2i.
* Resolved a ``UserWarning`` when used with cffi 1.8.3.
* Fixed a memory leak in name creation with X.509.
* Added a workaround for old versions of setuptools.
* Fixed an issue preventing ``cryptography`` from compiling against
OpenSSL 1.0.2i.



.. _v1-5:

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

* Added
:func:`~cryptography.hazmat.primitives.asymmetric.padding.calculate_max_pss_salt_length`.
* Added "one shot"
:meth:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey.sign`
and
:meth:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey.verify`
methods to DSA keys.
* Added "one shot"
:meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey.sign`
and
:meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.verify`
methods to ECDSA keys.
* Switched back to the older callback model on Python 3.5 in order to mitigate
the locking callback problem with OpenSSL <1.1.0.
* :class:`~cryptography.x509.CertificateBuilder`,
:class:`~cryptography.x509.CertificateRevocationListBuilder`, and
:class:`~cryptography.x509.RevokedCertificateBuilder` now accept timezone
aware ``datetime`` objects as method arguments
* ``cryptography`` now supports OpenSSL 1.1.0 as a compilation target.



.. _v1-4: