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gh-72570: mention the incompatibility of XOFs with HMAC #136676

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Jul 15, 2025
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gh-72570: mention the incompatibility of XOFs with HMAC #136676

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3 changes: 3 additions & 0 deletions Doc/library/hmac.rst
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Expand Up @@ -12,6 +12,9 @@
--------------

This module implements the HMAC algorithm as described by :rfc:`2104`.
The interface allows to use any hash function with a *fixed* digest size.
In particular, extendable output functions such as SHAKE-128 or SHAKE-256
cannot be used with HMAC.


.. function:: new(key, msg=None, digestmod)
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