[hashcash] Re: Some ideas for speeding up hashcash calculations
- From: Jonathan Morton <chromi@xxxxxxxxxxxxxxxxxxxxx>
- To: hashcash@xxxxxxxxxxxxx
- Date: Tue, 3 Aug 2004 19:31:35 +0100
1) changes to W at position 0x0c do not affect 11 of the remaining
64 words in W, and
2) if you only change positions 0x0c and 0x0d of a sha-1 block, then
you can calculate A,B,C,D, and E after the first 12 iterations of
the sha-1 loop once, use those values instead of H0,H1,H2,H3, and
H4 as initializers and skip the first 12 (out of 80) iterations
of
the sha-1 loop.
I'm already using both of these ideas. Sorry. :)
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from: Jonathan "Chromatix" Morton
mail: chromi@xxxxxxxxxxxxxxxxxxxxx
website: http://www.chromatix.uklinux.net/
tagline: The key to knowledge is not to rely on people to teach you it.
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