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-.. hazmat::
-
-Backend Interfaces
-==================
-
-.. currentmodule:: cryptography.hazmat.bindings.interfaces
-
-
-Backend implementations may provide a number of interfaces to support operations
-such as :doc:`/hazmat/primitives/symmetric-encryption`,
-:doc:`/hazmat/primitives/cryptographic-hashes`, and
-:doc:`/hazmat/primitives/hmac`.
-
-A specific ``backend`` may provide one or more of these interfaces.
-
-
-.. class:: CipherBackend
-
-    A backend which provides methods for using ciphers for encryption
-    and decryption.
-
-    .. method:: cipher_supported(cipher, mode)
-
-        Check if a ``cipher`` and ``mode`` combination is supported by
-        this backend.
-
-        :param cipher: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm`
-            provider.
-        :param mode: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.Mode` provider.
-
-        :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)
-
-        Create a
-        :class:`~cryptogrpahy.hazmat.primitives.interfaces.CipherContext` that
-        can be used for encrypting data with the symmetric ``cipher`` using
-        the given ``mode``.
-
-        :param cipher: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm`
-            provider.
-        :param mode: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.Mode` provider.
-
-        :returns:
-            :class:`~cryptography.hazmat.primitives.interfaces.CipherContext`
-
-
-    .. method:: create_symmetric_decryption_ctx(cipher, mode)
-
-        Create a
-        :class:`~cryptogrpahy.hazmat.primitives.interfaces.CipherContext` that
-        can be used for decrypting data with the symmetric ``cipher`` using
-        the given ``mode``.
-
-        :param cipher: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.CipherAlgorithm`
-            provider.
-        :param mode: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.Mode` provider.
-
-        :returns:
-            :class:`~cryptography.hazmat.primitives.interfaces.CipherContext`
-
-
-.. class:: HashBackend
-
-    A backend with methods for using cryptographic hash functions.
-
-    .. method:: hash_supported(algorithm)
-
-        Check if the specified ``algorithm`` is supported by this backend.
-
-        :param algorithm: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
-            provider.
-
-        :returns: ``True`` if the specified ``algorithm`` is supported by this
-            backend, otherwise ``False``.
-
-
-    .. method:: create_hash_ctx(algorithm)
-
-        Create a
-        :class:`~cryptogrpahy.hazmat.primitives.interfaces.HashContext` that
-        uses the specified ``algorithm`` to calculate a message digest.
-
-        :param algorithm: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
-            provider.
-
-        :returns:
-            :class:`~cryptography.hazmat.primitives.interfaces.HashContext`
-
-
-.. class:: HMACBackend
-
-    A backend with methods for using cryptographic hash functions as message
-    authentication codes.
-
-    .. method:: create_hmac_ctx(algorithm)
-
-        Create a
-        :class:`~cryptogrpahy.hazmat.primitives.interfaces.HashContext` that
-        uses the specified ``algorithm`` to calculate a hash-based message
-        authentication code.
-
-        :param algorithm: An instance of a
-            :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
-            provider.
-
-        :returns:
-            :class:`~cryptography.hazmat.primitives.interfaces.HashContext`