Hi Cryptogurus,

I'm just wondering something about something I saw in a protocol spec...
How to implement something like:

        Y = X xor SHA-1(Z)

Where X is an arbitrary array of bits which may be longer or shorter than
the 160-bit output of SHA-1.

Do I have to process X by 160-bit chunks and truncate SHA-1 digest when
I encounter a final chunk < 160-bit?

Thanks,

 - Xavier

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#exclude <windows.h> 
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