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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.
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