simple HMAC Authentication in Python.
PyAuthTicket uses HMAC to generate a one time ticket based on a secret key, message (optional) and timestamp (defaults to the current time). If both sides know a secret key (ie, an API key), a receiver can verify the identity of a sender by requiring a ticket digest and the timestamp used to create it along with the actual request. To verify the sender, the receiver would create a ticket with the same credentials (key, request, timestamp) and verify it against the provided digest. This does not prevent replay attacks but as the timestamp is provided, a lower threshold can be set to reduce the time window in which replays can run.
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