SHA-based encryption function in Python

[Gerhard Häring]

* Paul Rubin <phr-n2002a at nightsong.com> [2002-04-24 20:05 -0700]:
> I'll experiment with some ways of coding HMAC to run fast in Python.
> The implementation that comes with the 2.2 library is pretty slow.

Hmm, as the one who submitted this code, I don't see much room for
improvement:

- the hexdigest method should really use binascii.hexlify(), but I
  didn't know about the existence of it at the time

- I don't see how to optimize _strxor

But then, I never benchmarked the module.

Gerhard
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reduce(lambda x,y:x+y,map(lambda x:chr(ord(x)^42),tuple('zS^BED\nX_FOY\x0b')))