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Move FFDH to decrepit #15643

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Move FFDH to decrepit #15643

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88a08f1
Move FFDH to decrepit
claude Sep 15, 2026
8b73eae
Keep the full DH docs at the old path with a moved warning
claude Sep 15, 2026
4b2fd70
Skip the FFDH deprecation tests that need DH on backends without it
claude Sep 15, 2026
b984baf
Suggest X25519 and ML-KEM alongside ECDH in the FFDH migration notes
claude Sep 15, 2026
6999f2b
Document FFDH only on the decrepit page
claude Sep 15, 2026
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28 changes: 18 additions & 10 deletions CHANGELOG.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,14 @@ Changelog
the key loading APIs (including from X.509 certificates and certificate
signing requests). Users should migrate to a more modern signature
algorithm.
* Moved Diffie-Hellman key exchange over finite fields (FFDH), which was
deprecated in 50.0.0, into :doc:`/hazmat/decrepit/index` as
:mod:`cryptography.hazmat.decrepit.asymmetric.dh`. The types in
``cryptography.hazmat.primitives.asymmetric.dh`` remain deprecated, as do
``load_pem_parameters`` and ``load_der_parameters`` in
``cryptography.hazmat.primitives.serialization`` and loading FFDH keys with
the key loading APIs. Starting in 53.0.0, FFDH will only be available from
the decrepit module.

.. _v50-0-1:

Expand Down Expand Up @@ -80,7 +88,7 @@ Changelog
:func:`~cryptography.hazmat.primitives.serialization.load_pem_public_key` now
reject Diffie-Hellman public keys whose modulus is smaller than 512 bits,
matching the minimum already enforced when loading DH private keys and when
constructing :class:`~cryptography.hazmat.primitives.asymmetric.dh.DHParameterNumbers`.
constructing :class:`~cryptography.hazmat.decrepit.asymmetric.dh.DHParameterNumbers`.
* Added
:class:`~cryptography.hazmat.primitives.asymmetric.mldsa.MLDSAMuHasher` for
incrementally computing the ML-DSA ``mu`` (message representative) used by
Expand Down Expand Up @@ -481,8 +489,8 @@ Changelog
:class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey`,
:class:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey`,
:class:`~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey`,
:class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey`, and
:class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKey`
:class:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPrivateKey`, and
:class:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPublicKey`
abstract base classes.
* We significantly refactored how private key loading (
:func:`~cryptography.hazmat.primitives.serialization.load_pem_private_key`
Expand Down Expand Up @@ -739,7 +747,7 @@ Changelog
``X448PrivateKey``
:meth:`~cryptography.hazmat.primitives.asymmetric.x448.X448PrivateKey.exchange`,
and ``DHPrivateKey``
:meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey.exchange`.
:meth:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPrivateKey.exchange`.

.. _v42-0-1:

Expand Down Expand Up @@ -2092,7 +2100,7 @@ Changelog
: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`
:meth:`~cryptography.hazmat.decrepit.asymmetric.dh.DHParameters.parameter_bytes`
.
* The ``extensions`` attribute on :class:`~cryptography.x509.Certificate`,
:class:`~cryptography.x509.CertificateSigningRequest`,
Expand Down Expand Up @@ -2173,13 +2181,13 @@ Changelog
:meth:`~cryptography.hazmat.primitives.ciphers.CipherContext.update_into` on
:class:`~cryptography.hazmat.primitives.ciphers.CipherContext`.
* Added
:meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey.private_bytes`
:meth:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPrivateKey.private_bytes`
to
:class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey`.
:class:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPrivateKey`.
* Added
:meth:`~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKey.public_bytes`
:meth:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPublicKey.public_bytes`
to
:class:`~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKey`.
:class:`~cryptography.hazmat.decrepit.asymmetric.dh.DHPublicKey`.
* :func:`~cryptography.hazmat.primitives.serialization.load_pem_private_key`
and
:func:`~cryptography.hazmat.primitives.serialization.load_der_private_key`
Expand Down Expand Up @@ -2213,7 +2221,7 @@ Changelog
* 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`.
:meth:`~cryptography.hazmat.decrepit.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
Expand Down
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