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Implements the HMAC algorithm as described by RFC 2104.
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digestmod: A hash name suitable for hashlib.new(). *OR*
A hashlib constructor returning a new hash object. *OR*
A module supporting PEP 247.
Required as of 3.8, despite its position after the optional
msg argument. Passing it as a keyword argument is
recommended, though not required for legacy API reasons.
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