[Cryptography] Two round secure hashing

[Bill Cox]

I'd appreciate feedback on the following dumb idea.  If it works as I hope,
it will dramatically speed up secure file hashing.  My benchmarks from
yesterday are out of date, but I was seeing file hashing 5X-ish faster than
md5sum, and 12X-ish faster than sha256sum.  Here's a simple page I wrote on
the idea:

http://waywardgeek.net/hashproof.html

Any feedback welcome

Bill
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