Remove register_cipher_adapter from the interface and the documentation.
diff --git a/cryptography/hazmat/backends/interfaces.py b/cryptography/hazmat/backends/interfaces.py
index 9a57096..4fbb348 100644
--- a/cryptography/hazmat/backends/interfaces.py
+++ b/cryptography/hazmat/backends/interfaces.py
@@ -26,12 +26,6 @@
"""
@abc.abstractmethod
- def register_cipher_adapter(self, cipher, mode, adapter):
- """
- Register an adapter for a cipher and mode to a backend specific object.
- """
-
- @abc.abstractmethod
def create_symmetric_encryption_ctx(self, cipher, mode):
"""
Get a CipherContext that can be used for encryption.
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 5b6cd64..11e2f2a 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -33,25 +33,6 @@
:returns: ``True`` if the specified ``cipher`` and ``mode`` combination
is supported by this backend, otherwise ``False``
- .. method:: register_cipher_adapter(cipher_cls, mode_cls, adapter)
-
- Register an adapter which can be used to create a backend specific
- object from instances of the
- :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm` and
- the :class:`~cryptography.hazmat.primitives.interfaces.Mode` primitives.
-
- :param cipher_cls: A class whose instances provide
- :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm`
- :param mode_cls: A class whose instances provide:
- :class:`~cryptography.hazmat.primitives.interfaces.Mode`
- :param adapter: A ``function`` that takes 3 arguments, ``backend`` (a
- :class:`CipherBackend` provider), ``cipher`` (a
- :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm`
- provider ), and ``mode`` (a
- :class:`~cryptography.hazmat.primitives.interfaces.Mode` provider).
- It returns a backend specific object which may be used to construct
- a :class:`~cryptogrpahy.hazmat.primitives.interfaces.CipherContext`.
-
.. method:: create_symmetric_encryption_ctx(cipher, mode)