AES keywrap support

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diff --git a/docs/hazmat/primitives/keywrap.rst b/docs/hazmat/primitives/keywrap.rst
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+.. hazmat::
+
+.. module:: cryptography.hazmat.primitives.keywrap
+
+Key wrapping
+============
+
+Key wrapping is a cryptographic construct that uses symmetric encryption to
+encapsulate key material.
+
+.. function:: aes_key_wrap(wrapping_key, key_to_wrap, backend)
+
+    :param bytes wrapping_key: The wrapping key.
+
+    :param bytes key_to_wrap: The key to wrap.
+
+    :param backend: A
+        :class:`~cryptography.hazmat.backends.interfaces.CipherBackend`
+        provider that supports
+        :class:`~cryptography.hazmat.primitives.ciphers.algorithms.AES`.
+
+    :return bytes: The wrapped key as bytes.
+
+.. function:: aes_key_unwrap(wrapping_key, wrapped_key, backend)
+
+    :param bytes wrapping_key: The wrapping key.
+
+    :param bytes wrapped_key: The wrapped key.
+
+    :param backend: A
+        :class:`~cryptography.hazmat.backends.interfaces.CipherBackend`
+        provider that supports
+        :class:`~cryptography.hazmat.primitives.ciphers.algorithms.AES`.
+
+    :return bytes: The unwrapped key as bytes.
+
+Exceptions
+~~~~~~~~~~
+
+.. class:: InvalidUnwrap
+
+    This is raised when a wrapped key fails to unwrap. It can be caused by a
+    corrupted or invalid wrapped key or an invalid wrapping key.