[issue21306] PEP 466: backport hmac.compare_digest

[Alex Gaynor]

Alex Gaynor added the comment:

Attached patch implements compare_digest. Code is mostly a 1-1 from 3.x, except the Unicode paths are changed, and the tests are a tiny bit different.

* Still needs to backport the docs.
* Compares all unicode objects, not just ascii ones.

If the patch looks good to folks I'll add the docs as well.

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keywords: +patch
Added file: http://bugs.python.org/file35005/compare_digest.diff

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