Summary: Timing side-channel protected string compare

Description:
This module provides one function, 'equals' (not exported by default).

You should pass this function two strings of the same length. It will
return true if they are string-wise identical and false otherwise, just
like 'eq'. However, comparing any two differing strings will take a fixed
amount of time, unlike 'eq'.

*NOTE*: If the lengths of the strings are different, 'equals' will return
false right away. Also, comparing two identical strings will take a
different amount of time than comparing two differing strings.

Maintainer: nobody