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I suppose one could split the input into 72 byte chunks, hash each chunk and then combine again. Either store that, or rinse-and-repeat until you end up with one final hash.



> I suppose one could split the input into 72 byte chunks, hash each chunk and then combine again

This sounds like a recipe for screwing something up and opening yourself up to some kind of weird attack. I'm not enough of a crypto expert to know what the downside of this would be but it's more mucking around with crypto that I would be comfortable with.




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