Sourced from cryptography's changelog.

40.0.0 - 2023-03-24

BACKWARDS INCOMPATIBLE: As announced in the 39.0.0 changelog, the way
cryptography links OpenSSL has changed. This only impacts users who
build cryptography from source (i.e., not from a wheel), and
specify their own version of OpenSSL. For those users, the CFLAGS,
LDFLAGS, INCLUDE, LIB, and CRYPTOGRAPHY_SUPPRESS_LINK_FLAGS
environment variables are no longer valid. Instead, users need to configure
their builds as documented here_.


Support for Python 3.6 is deprecated and will be removed in the next
release.


Deprecated the current minimum supported Rust version (MSRV) of 1.48.0.
In the next release we will raise MSRV to 1.56.0. Users with the latest
pip will typically get a wheel and not need Rust installed, but check
:doc:/installation for documentation on installing a newer rustc if
required.


Deprecated support for OpenSSL less than 1.1.1d. The next release of
cryptography will drop support for older versions.


Deprecated support for DSA keys in
:func:~cryptography.hazmat.primitives.serialization.load_ssh_public_key
and
:func:~cryptography.hazmat.primitives.serialization.load_ssh_private_key.


Deprecated support for OpenSSH serialization in
:class:~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey
and
:class:~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey.


The minimum supported version of PyPy3 is now 7.3.10.


Updated Windows, macOS, and Linux wheels to be compiled with OpenSSL 3.1.0.


Added support for parsing SSH certificates in addition to public keys with
:func:~cryptography.hazmat.primitives.serialization.load_ssh_public_identity.
:func:~cryptography.hazmat.primitives.serialization.load_ssh_public_key
continues to support only public keys.


Added support for generating SSH certificates with
:class:~cryptography.hazmat.primitives.serialization.SSHCertificateBuilder.


Added :meth:~cryptography.x509.Certificate.verify_directly_issued_by to
:class:~cryptography.x509.Certificate.


Added a check to :class:~cryptography.x509.NameConstraints to ensure that
:class:~cryptography.x509.DNSName constraints do not contain any *
wildcards.


Removed many unused CFFI OpenSSL bindings. This will not impact you unless
you are using cryptography to directly invoke OpenSSL's C API. Note that
these have never been considered a stable, supported, public API by
cryptography, this note is included as a courtesy.


The X.509 builder classes now raise UnsupportedAlgorithm instead of
ValueError if an unsupported hash algorithm is passed.


Added public union type aliases for type hinting:

Asymmetric types:
</tr></table>

... (truncated)

• 45e3771 version bump and changelog for 40.0.0 (#8583)
• c8328c0 Migrate x25519 to use rust-openssl (#7933)
• 370280b fixes #8450 -- enable sparse registry everywhere (#8566)
• 6a900fe Bump ruff from 0.0.258 to 0.0.259 (#8580)
• 1a911a0 Bump openssl from 0.10.47 to 0.10.48 in /src/rust (#8581)
• f147302 Bump filelock from 3.10.2 to 3.10.3 (#8579)
• 005bbe0 Bump BoringSSL and/or OpenSSL in CI (#8578)
• 41ebbe7 Bump filelock from 3.10.0 to 3.10.2 (#8575)
• 9b906f0 we don't need these in the constraints since we no longer depend on them (#8577)
• c45706e Bump ruff from 0.0.257 to 0.0.258 (#8574)
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