OPIE patch for current CVS

[Wichert Akkerman]

Previously Markus Friedl wrote:
> how different is this from skey?
> isn't this just a s/skey/opie/g ?

Not quite, there are a few different requirements with respect to
generating the challenge and doing the verification. The code is
quite similar though.

s/key might actually have the same problem, but since I don't have it
here and afaik it's unmaintained these days I haven't bothered to look
into it.

Wichert.

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