[Haskell-cafe] My MD5
andrewcoppin at btinternet.com
Sat Nov 17 12:51:32 EST 2007
Thomas DuBuisson wrote:
>> BTW, while I'm here... I sat down and wrote my own MD5 implementation.
Huzzah! It works! :-D
I had a silly bug where somewhere deep in the heart of the huge complex
message padding algorithm, I forgot to add on the cumulative total to
the message size count. This results in the number of bits in the
*final* block being used, rather than the number of bits in the entire
> How is the performance on this new MD5 routine?
Not good. (Surprised?)
I told it to hash a 1 MB file, and there was a noticable split-second
pause. I told it to hash a 400 MB file, and... well, after about 1
minute wall time and 200 MB RAM I killed the process. RAM usage seems to
grow linearly with time, which is Not Good(tm). To me, this suggests
that something somewhere isn't as lazy as it should be. Hmm. Well
whatever, next stop is the GHC profiler to see where my resources are
going. Given the above bug, it's probably something easily fixable...
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