Adds PHP implementation of client-side OTP check #1
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What does this do? I see a lot of bit manipulation.
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Best explanation is http://en.wikipedia.org/wiki/HMAC-based_One-time_Password_Algorithm. Truncate is:
a function that selects 4 bytes from the result of the HMAC in a defined manner
This implementation is just a php port of the truncate algorithm from the oath reference implementation
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