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Exceptions
==========
.. currentmodule:: cryptography.exceptions
.. class:: UnsupportedAlgorithm
Raised when the requested algorithm, or combination of algorithms is not
supported.
.. class:: AlreadyFinalized
This is raised when a context is used after being finalized.
.. class:: InvalidSignature
This is raised when signature verification fails. This can occur with
HMAC or asymmetric key signature validation.
.. class:: NotYetFinalized
This is raised when the AEAD tag property is accessed on a context
before it is finalized.
.. class:: AlreadyUpdated
This is raised when additional data is added to a context after update
has already been called.
.. class:: InvalidKey
This is raised when the verify method of a key derivation function's
computed key does not match the expected key.
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