Sometimes you need to test strings for equality with an algorithm whose timing depends only on the length of the strings, and not on the contents of the strings themselves. If one of those strings is of constant width – an HMAC, for example – then it becomes a constant-time operation. This can be used to prevent some timing side-channel attacks, such as the critical vulnerability found in KeyCzar back in 2009.
This module offers a single function, equals(x, y), which takes two strings x and y and returns True if they are equal, and False if they are not. The time this function takes does not depend on what specific bytes are in these strings. Strings are encoded with UTF-8 before being compared. This works on both Unicode and byte strings, in Python 2 and 3.
This works with Python 2 and 3, and PyPy. The license is Apache 2.0.
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