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CHANGELOG.rst

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    • CHANGELOG.rst 58.03 KiB

    Changelog

    3.0 - master

    Note

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

    • 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.
    • 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.

    2.9.2 - 2020-04-22

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

    2.9.1 - 2020-04-21

    • Updated Windows, macOS, and manylinux wheels to be compiled with OpenSSL 1.1.1g.

    2.9 - 2020-04-02

    • BACKWARDS INCOMPATIBLE: Support for Python 3.4 has been removed due to low usage and maintenance burden.
    • BACKWARDS INCOMPATIBLE: Support for OpenSSL 1.0.1 has been removed. Users on older version of OpenSSL will need to upgrade.
    • BACKWARDS INCOMPATIBLE: Support for LibreSSL 2.6.x has been removed.
    • Removed support for calling :meth:`~cryptography.hazmat.primitives.asymmetric.x25519.X25519PublicKey.public_bytes` with no arguments, as per our deprecation policy. You must now pass encoding and format.
    • BACKWARDS INCOMPATIBLE: Reversed the order in which :meth:`~cryptography.x509.Name.rfc4514_string` returns the RDNs as required by RFC 4514.
    • Updated Windows, macOS, and manylinux wheels to be compiled with OpenSSL 1.1.1f.
    • Added support for parsing :attr:`~cryptography.x509.ocsp.OCSPResponse.single_extensions` in an OCSP response.
    • :class:`~cryptography.x509.NameAttribute` values can now be empty strings.

    2.8 - 2019-10-16

    • Updated Windows, macOS, and manylinux wheels to be compiled with OpenSSL 1.1.1d.
    • Added support for Python 3.8.
    • Added class methods :meth:`Poly1305.generate_tag <cryptography.hazmat.primitives.poly1305.Poly1305.generate_tag>` and :meth:`Poly1305.verify_tag <cryptography.hazmat.primitives.poly1305.Poly1305.verify_tag>` for Poly1305 sign and verify operations.
    • Deprecated support for OpenSSL 1.0.1. Support will be removed in cryptography 2.9.
    • We now ship manylinux2010 wheels in addition to our manylinux1 wheels.
    • Added support for ed25519 and ed448 keys in the :class:`~cryptography.x509.CertificateBuilder`, :class:`~cryptography.x509.CertificateSigningRequestBuilder`, :class:`~cryptography.x509.CertificateRevocationListBuilder` and :class:`~cryptography.x509.ocsp.OCSPResponseBuilder`.
    • cryptography no longer depends on asn1crypto.
    • :class:`~cryptography.x509.FreshestCRL` is now allowed as a :class:`~cryptography.x509.CertificateRevocationList` extension.

    2.7 - 2019-05-30

    • BACKWARDS INCOMPATIBLE: We no longer distribute 32-bit manylinux1 wheels. Continuing to produce them was a maintenance burden.
    • BACKWARDS INCOMPATIBLE: Removed the cryptography.hazmat.primitives.mac.MACContext interface. The CMAC and HMAC APIs have not changed, but they are no longer registered as MACContext instances.
    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.1c.
    • Removed support for running our tests with setup.py test. Users interested in running our tests can continue to follow the directions in our :doc:`development documentation</development/getting-started>`.
    • Add support for :class:`~cryptography.hazmat.primitives.poly1305.Poly1305` when using OpenSSL 1.1.1 or newer.
    • Support serialization with Encoding.OpenSSH and PublicFormat.OpenSSH in :meth:`Ed25519PublicKey.public_bytes <cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PublicKey.public_bytes>` .
    • Correctly allow passing a SubjectKeyIdentifier to :meth:`~cryptography.x509.AuthorityKeyIdentifier.from_issuer_subject_key_identifier` and deprecate passing an Extension object. The documentation always required SubjectKeyIdentifier but the implementation previously required an Extension.

    2.6.1 - 2019-02-27

    • Resolved an error in our build infrastructure that broke our Python3 wheels for macOS and Linux.

    2.6 - 2019-02-27

    • BACKWARDS INCOMPATIBLE: Removed cryptography.hazmat.primitives.asymmetric.utils.encode_rfc6979_signature and cryptography.hazmat.primitives.asymmetric.utils.decode_rfc6979_signature, which had been deprecated for nearly 4 years. Use :func:`~cryptography.hazmat.primitives.asymmetric.utils.encode_dss_signature` and :func:`~cryptography.hazmat.primitives.asymmetric.utils.decode_dss_signature` instead.
    • BACKWARDS INCOMPATIBLE: Removed cryptography.x509.Certificate.serial, which had been deprecated for nearly 3 years. Use :attr:`~cryptography.x509.Certificate.serial_number` instead.
    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.1b.
    • Added support for :doc:`/hazmat/primitives/asymmetric/ed448` when using OpenSSL 1.1.1b or newer.
    • Added support for :doc:`/hazmat/primitives/asymmetric/ed25519` when using OpenSSL 1.1.1b or newer.
    • :func:`~cryptography.hazmat.primitives.serialization.load_ssh_public_key` can now load ed25519 public keys.
    • Add support for easily mapping an object identifier to its elliptic curve class via :func:`~cryptography.hazmat.primitives.asymmetric.ec.get_curve_for_oid`.
    • Add support for OpenSSL when compiled with the no-engine (OPENSSL_NO_ENGINE) flag.

    2.5 - 2019-01-22

    • BACKWARDS INCOMPATIBLE: :term:`U-label` strings were deprecated in version 2.1, but this version removes the default idna dependency as well. If you still need this deprecated path please install cryptography with the idna extra: pip install cryptography[idna].
    • BACKWARDS INCOMPATIBLE: The minimum supported PyPy version is now 5.4.
    • Numerous classes and functions have been updated to allow :term:`bytes-like` types for keying material and passwords, including symmetric algorithms, AEAD ciphers, KDFs, loading asymmetric keys, and one time password classes.
    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.1a.
    • Added support for :class:`~cryptography.hazmat.primitives.hashes.SHA512_224` and :class:`~cryptography.hazmat.primitives.hashes.SHA512_256` when using OpenSSL 1.1.1.
    • Added support for :class:`~cryptography.hazmat.primitives.hashes.SHA3_224`, :class:`~cryptography.hazmat.primitives.hashes.SHA3_256`, :class:`~cryptography.hazmat.primitives.hashes.SHA3_384`, and :class:`~cryptography.hazmat.primitives.hashes.SHA3_512` when using OpenSSL 1.1.1.
    • Added support for :doc:`/hazmat/primitives/asymmetric/x448` when using OpenSSL 1.1.1.
    • Added support for :class:`~cryptography.hazmat.primitives.hashes.SHAKE128` and :class:`~cryptography.hazmat.primitives.hashes.SHAKE256` when using OpenSSL 1.1.1.
    • Added initial support for parsing PKCS12 files with :func:`~cryptography.hazmat.primitives.serialization.pkcs12.load_key_and_certificates`.
    • Added support for :class:`~cryptography.x509.IssuingDistributionPoint`.
    • Added rfc4514_string() method to :meth:`x509.Name <cryptography.x509.Name.rfc4514_string>`, :meth:`x509.RelativeDistinguishedName <cryptography.x509.RelativeDistinguishedName.rfc4514_string>`, and :meth:`x509.NameAttribute <cryptography.x509.NameAttribute.rfc4514_string>` to format the name or component an RFC 4514 Distinguished Name string.
    • Added :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.from_encoded_point`, which immediately checks if the point is on the curve and supports compressed points. Deprecated the previous method :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicNumbers.from_encoded_point`.
    • Added :attr:`~cryptography.x509.ocsp.OCSPResponse.signature_hash_algorithm` to OCSPResponse.
    • Updated :doc:`/hazmat/primitives/asymmetric/x25519` support to allow additional serialization methods. Calling :meth:`~cryptography.hazmat.primitives.asymmetric.x25519.X25519PublicKey.public_bytes` with no arguments has been deprecated.
    • Added support for encoding compressed and uncompressed points via :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.public_bytes`. Deprecated the previous method :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicNumbers.encode_point`.

    2.4.2 - 2018-11-21

    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.0j.

    2.4.1 - 2018-11-11

    • Fixed a build breakage in our manylinux1 wheels.

    2.4 - 2018-11-11

    • BACKWARDS INCOMPATIBLE: Dropped support for LibreSSL 2.4.x.
    • Deprecated OpenSSL 1.0.1 support. OpenSSL 1.0.1 is no longer supported by the OpenSSL project. At this time there is no time table for dropping support, however we strongly encourage all users to upgrade or install cryptography from a wheel.
    • Added initial :doc:`OCSP </x509/ocsp>` support.
    • Added support for :class:`~cryptography.x509.PrecertPoison`.

    2.3.1 - 2018-08-14

    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.0i.

    2.3 - 2018-07-18

    • SECURITY ISSUE: :meth:`~cryptography.hazmat.primitives.ciphers.AEADDecryptionContext.finalize_with_tag` allowed tag truncation by default which can allow tag forgery in some cases. The method now enforces the min_tag_length provided to the :class:`~cryptography.hazmat.primitives.ciphers.modes.GCM` constructor. CVE-2018-10903
    • Added support for Python 3.7.
    • Added :meth:`~cryptography.fernet.Fernet.extract_timestamp` to get the authenticated timestamp of a :doc:`Fernet </fernet>` token.
    • Support for Python 2.7.x without hmac.compare_digest has been deprecated. We will require Python 2.7.7 or higher (or 2.7.6 on Ubuntu) in the next cryptography release.
    • Fixed multiple issues preventing cryptography from compiling against LibreSSL 2.7.x.
    • Added :class:`~cryptography.x509.CertificateRevocationList.get_revoked_certificate_by_serial_number` for quick serial number searches in CRLs.
    • The :class:`~cryptography.x509.RelativeDistinguishedName` class now preserves the order of attributes. Duplicate attributes now raise an error instead of silently discarding duplicates.
    • :func:`~cryptography.hazmat.primitives.keywrap.aes_key_unwrap` and :func:`~cryptography.hazmat.primitives.keywrap.aes_key_unwrap_with_padding` now raise :class:`~cryptography.hazmat.primitives.keywrap.InvalidUnwrap` if the wrapped key is an invalid length, instead of ValueError.

    2.2.2 - 2018-03-27

    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.0h.

    2.2.1 - 2018-03-20

    • Reverted a change to GeneralNames which prohibited having zero elements, due to breakages.
    • Fixed a bug in :func:`~cryptography.hazmat.primitives.keywrap.aes_key_unwrap_with_padding` that caused it to raise InvalidUnwrap when key length modulo 8 was zero.

    2.2 - 2018-03-19

    • BACKWARDS INCOMPATIBLE: Support for Python 2.6 has been dropped.
    • Resolved a bug in HKDF that incorrectly constrained output size.
    • Added :class:`~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP256R1`, :class:`~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP384R1`, and :class:`~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP512R1` to support inter-operating with systems like German smart meters.
    • Added token rotation support to :doc:`Fernet </fernet>` with :meth:`~cryptography.fernet.MultiFernet.rotate`.
    • Fixed a memory leak in :func:`~cryptography.hazmat.primitives.asymmetric.ec.derive_private_key`.
    • Added support for AES key wrapping with padding via :func:`~cryptography.hazmat.primitives.keywrap.aes_key_wrap_with_padding` and :func:`~cryptography.hazmat.primitives.keywrap.aes_key_unwrap_with_padding` .
    • Allow loading DSA keys with 224 bit q.

    2.1.4 - 2017-11-29

    • Added X509_up_ref for an upcoming pyOpenSSL release.

    2.1.3 - 2017-11-02

    • Updated Windows, macOS, and manylinux1 wheels to be compiled with OpenSSL 1.1.0g.

    2.1.2 - 2017-10-24

    • Corrected a bug with the manylinux1 wheels where OpenSSL's stack was marked executable.

    2.1.1 - 2017-10-12

    • Fixed support for install with the system pip on Ubuntu 16.04.

    2.1 - 2017-10-11

    • FINAL DEPRECATION Python 2.6 support is deprecated, and will be removed in the next release of cryptography.
    • BACKWARDS INCOMPATIBLE: Whirlpool, RIPEMD160, and UnsupportedExtension have been removed in accordance with our :doc:`/api-stability` policy.
    • BACKWARDS INCOMPATIBLE: :attr:`DNSName.value <cryptography.x509.DNSName.value>`, :attr:`RFC822Name.value <cryptography.x509.RFC822Name.value>`, and :attr:`UniformResourceIdentifier.value <cryptography.x509.UniformResourceIdentifier.value>` will now return an :term:`A-label` string when parsing a certificate containing an internationalized domain name (IDN) or if the caller passed a :term:`U-label` to the constructor. See below for additional deprecations related to this change.
    • Installing cryptography now requires pip 6 or newer.
    • Deprecated passing :term:`U-label` strings to the :class:`~cryptography.x509.DNSName`, :class:`~cryptography.x509.UniformResourceIdentifier`, and :class:`~cryptography.x509.RFC822Name` constructors. Instead, users should pass values as :term:`A-label` strings with idna encoding if necessary. This change will not affect anyone who is not processing internationalized domains.
    • Added support for :class:`~cryptography.hazmat.primitives.ciphers.algorithms.ChaCha20`. In most cases users should choose :class:`~cryptography.hazmat.primitives.ciphers.aead.ChaCha20Poly1305` rather than using this unauthenticated form.
    • Added :meth:`~cryptography.x509.CertificateRevocationList.is_signature_valid` to :class:`~cryptography.x509.CertificateRevocationList`.
    • Support :class:`~cryptography.hazmat.primitives.hashes.BLAKE2b` and :class:`~cryptography.hazmat.primitives.hashes.BLAKE2s` with :class:`~cryptography.hazmat.primitives.hmac.HMAC`.
    • Added support for :class:`~cryptography.hazmat.primitives.ciphers.modes.XTS` mode for AES.
    • Added support for using labels with :class:`~cryptography.hazmat.primitives.asymmetric.padding.OAEP` when using OpenSSL 1.0.2 or greater.
    • Improved compatibility with NSS when issuing certificates from an issuer that has a subject with non-UTF8String string types.
    • Add support for the :class:`~cryptography.x509.DeltaCRLIndicator` extension.
    • Add support for the :class:`~cryptography.x509.TLSFeature` extension. This is commonly used for enabling OCSP Must-Staple in certificates.
    • Add support for the :class:`~cryptography.x509.FreshestCRL` extension.

    2.0.3 - 2017-08-03

    • Fixed an issue with weak linking symbols when compiling on macOS versions older than 10.12.

    2.0.2 - 2017-07-27

    • Marked all symbols as hidden in the manylinux1 wheel to avoid a bug with symbol resolution in certain scenarios.

    2.0.1 - 2017-07-26

    • Fixed a compilation bug affecting OpenBSD.
    • Altered the manylinux1 wheels to statically link OpenSSL instead of dynamically linking and bundling the shared object. This should resolve crashes seen when using uwsgi or other binaries that link against OpenSSL independently.
    • Fixed the stack level for the signer and verifier warnings.

    2.0 - 2017-07-17

    • BACKWARDS INCOMPATIBLE: Support for Python 3.3 has been dropped.
    • We now ship manylinux1 wheels linked against OpenSSL 1.1.0f. These wheels will be automatically used with most Linux distributions if you are running the latest pip.
    • Deprecated the use of signer on :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey`, :class:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey`, and :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey` in favor of sign.
    • Deprecated the use of verifier on :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey`, :class:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey`, and :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey` in favor of verify.
    • Added support for parsing :class:`~cryptography.x509.certificate_transparency.SignedCertificateTimestamp` objects from X.509 certificate extensions.
    • Added support for :class:`~cryptography.hazmat.primitives.ciphers.aead.ChaCha20Poly1305`.
    • Added support for :class:`~cryptography.hazmat.primitives.ciphers.aead.AESCCM`.
    • Added :class:`~cryptography.hazmat.primitives.ciphers.aead.AESGCM`, a "one shot" API for AES GCM encryption.
    • Added support for :doc:`/hazmat/primitives/asymmetric/x25519`.
    • Added support for serializing and deserializing Diffie-Hellman parameters with :func:`~cryptography.hazmat.primitives.serialization.load_pem_parameters`, :func:`~cryptography.hazmat.primitives.serialization.load_der_parameters`, and :meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHParameters.parameter_bytes` .
    • The extensions attribute on :class:`~cryptography.x509.Certificate`, :class:`~cryptography.x509.CertificateSigningRequest`, :class:`~cryptography.x509.CertificateRevocationList`, and :class:`~cryptography.x509.RevokedCertificate` now caches the computed Extensions object. There should be no performance change, just a performance improvement for programs accessing the extensions attribute multiple times.

    1.9 - 2017-05-29

    • BACKWARDS INCOMPATIBLE: Elliptic Curve signature verification no longer returns True on success. This brings it in line with the interface's documentation, and our intent. The correct way to use :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.verify` has always been to check whether or not :class:`~cryptography.exceptions.InvalidSignature` was raised.
    • BACKWARDS INCOMPATIBLE: Dropped support for macOS 10.7 and 10.8.
    • BACKWARDS INCOMPATIBLE: The minimum supported PyPy version is now 5.3.
    • Python 3.3 support has been deprecated, and will be removed in the next cryptography release.
    • Add support for providing tag during :class:`~cryptography.hazmat.primitives.ciphers.modes.GCM` finalization via :meth:`~cryptography.hazmat.primitives.ciphers.AEADDecryptionContext.finalize_with_tag`.
    • Fixed an issue preventing cryptography from compiling against LibreSSL 2.5.x.
    • Added :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.key_size` and :meth:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey.key_size` as convenience methods for determining the bit size of a secret scalar for the curve.
    • Accessing an unrecognized extension marked critical on an X.509 object will no longer raise an UnsupportedExtension exception, instead an :class:`~cryptography.x509.UnrecognizedExtension` object will be returned. This behavior was based on a poor reading of the RFC, unknown critical extensions only need to be rejected on certificate verification.
    • The CommonCrypto backend has been removed.
    • MultiBackend has been removed.
    • Whirlpool and RIPEMD160 have been deprecated.

    1.8.2 - 2017-05-26

    • Fixed a compilation bug affecting OpenSSL 1.1.0f.
    • Updated Windows and macOS wheels to be compiled against OpenSSL 1.1.0f.

    1.8.1 - 2017-03-10

    • Fixed macOS wheels to properly link against 1.1.0 rather than 1.0.2.

    1.8 - 2017-03-09

    • Added support for Python 3.6.
    • Windows and macOS wheels now link against OpenSSL 1.1.0.
    • macOS wheels are no longer universal. This change significantly shrinks the size of the wheels. Users on macOS 32-bit Python (if there are any) should migrate to 64-bit or build their own packages.
    • Changed ASN.1 dependency from pyasn1 to asn1crypto resulting in a general performance increase when encoding/decoding ASN.1 structures. Also, the pyasn1_modules test dependency is no longer required.
    • Added support for :meth:`~cryptography.hazmat.primitives.ciphers.CipherContext.update_into` on :class:`~cryptography.hazmat.primitives.ciphers.CipherContext`.
    • Added :meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKeyWithSerialization.private_bytes` to :class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKeyWithSerialization`.
    • Added :meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKey.public_bytes` to :class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKey`.
    • :func:`~cryptography.hazmat.primitives.serialization.load_pem_private_key` and :func:`~cryptography.hazmat.primitives.serialization.load_der_private_key` now require that password must be bytes if provided. Previously this was documented but not enforced.
    • Added support for subgroup order in :doc:`/hazmat/primitives/asymmetric/dh`.

    1.7.2 - 2017-01-27

    • Updated Windows and macOS wheels to be compiled against OpenSSL 1.0.2k.

    1.7.1 - 2016-12-13

    • Fixed a regression in int_from_bytes where it failed to accept bytearray.

    1.7 - 2016-12-12

    • 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.

    1.6 - 2016-11-22

    • 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.

    1.5.3 - 2016-11-05

    • 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

    1.5.2 - 2016-09-26

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

    1.5.1 - 2016-09-22

    • 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.

    1.5 - 2016-08-26

    • 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.

    1.4 - 2016-06-04

    • Support for OpenSSL 0.9.8 has been removed. Users on older versions of OpenSSL will need to upgrade.
    • Added :class:`~cryptography.hazmat.primitives.kdf.kbkdf.KBKDFHMAC`.
    • Added support for OpenSSH public key serialization.
    • Added support for SHA-2 in RSA :class:`~cryptography.hazmat.primitives.asymmetric.padding.OAEP` when using OpenSSL 1.0.2 or greater.
    • Added "one shot" :meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey.sign` and :meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey.verify` methods to RSA keys.
    • Deprecated the serial attribute on :class:`~cryptography.x509.Certificate`, in favor of :attr:`~cryptography.x509.Certificate.serial_number`.

    1.3.4 - 2016-06-03

    • Added another OpenSSL function to the bindings to support an upcoming pyOpenSSL release.

    1.3.3 - 2016-06-02

    • Added two new OpenSSL functions to the bindings to support an upcoming pyOpenSSL release.

    1.3.2 - 2016-05-04

    • Updated Windows and OS X wheels to be compiled against OpenSSL 1.0.2h.
    • Fixed an issue preventing cryptography from compiling against LibreSSL 2.3.x.

    1.3.1 - 2016-03-21

    • Fixed a bug that caused an AttributeError when using mock to patch some cryptography modules.

    1.3 - 2016-03-18

    • Added support for padding ANSI X.923 with :class:`~cryptography.hazmat.primitives.padding.ANSIX923`.
    • Deprecated support for OpenSSL 0.9.8. Support will be removed in cryptography 1.4.
    • Added support for the :class:`~cryptography.x509.PolicyConstraints` X.509 extension including both parsing and generation using :class:`~cryptography.x509.CertificateBuilder` and :class:`~cryptography.x509.CertificateSigningRequestBuilder`.
    • Added :attr:`~cryptography.x509.CertificateSigningRequest.is_signature_valid` to :class:`~cryptography.x509.CertificateSigningRequest`.
    • Fixed an intermittent AssertionError when performing an RSA decryption on an invalid ciphertext, ValueError is now correctly raised in all cases.
    • Added :meth:`~cryptography.x509.AuthorityKeyIdentifier.from_issuer_subject_key_identifier`.

    1.2.3 - 2016-03-01

    • Updated Windows and OS X wheels to be compiled against OpenSSL 1.0.2g.

    1.2.2 - 2016-01-29

    • Updated Windows and OS X wheels to be compiled against OpenSSL 1.0.2f.