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Antoine Pitrou 2012-06-24 16:18:48 +02:00
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Doc/library/hmac.rst
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@ -72,10 +72,10 @@ This module also provides the following helper function:
Return ``a == b``. This function uses an approach designed to prevent timing
analysis by avoiding content based short circuiting behaviour, making it
appropriate for cryptography. *a* and *b*
must both be of the same type: either :class:`str` (ASCII only, as e.g.
returned by :meth:`HMAC.hexdigest`), or any type that supports the
buffer protocol (e.g. :class:`bytes`).
appropriate for cryptography. *a* and *b* must both be of the same type:
either :class:`str` (ASCII only, as e.g. returned by
:meth:`HMAC.hexdigest`), or any type that supports the buffer protocol
(e.g. :class:`bytes`).
Using a short circuiting comparison (that is, one that terminates as soon as
it finds any difference between the values) to check digests for correctness