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Litecoin: Fix zeitgeist2 attack thanks to Lolcust and ArtForz. This fixes an issue where a 51% attack can change difficulty at will. Go back the full period unless it's the first retarget after genesis.

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coblee 2011-10-09 20:46:21 -10:00 committed by Warren Togami
parent 7b0e39430b
commit b1b31d15cc
1 changed files with 7 additions and 1 deletions
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8
src/pow.cpp
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@ -41,9 +41,15 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
return pindexLast->nBits; return pindexLast->nBits;
} }
// Litecoin: This fixes an issue where a 51% attack can change difficulty at will.
// Go back the full period unless it's the first retarget after genesis. Code courtesy of Art Forz
int blockstogoback = Params().Interval()-1;
if ((pindexLast->nHeight+1) != Params().Interval())
blockstogoback = Params().Interval();
// Go back by what we want to be 14 days worth of blocks // Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast; const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < Params().Interval()-1; i++) for (int i = 0; pindexFirst && i < blockstogoback; i++)
pindexFirst = pindexFirst->pprev; pindexFirst = pindexFirst->pprev;
assert(pindexFirst); assert(pindexFirst);