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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 db4d8e21d9
commit 164ae00f46
1 changed files with 7 additions and 1 deletions
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8
src/main.cpp
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@ -1136,9 +1136,15 @@ unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBl
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 = nInterval-1;
if ((pindexLast->nHeight+1) != nInterval)
blockstogoback = nInterval;
// Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < nInterval-1; i++)
for (int i = 0; pindexFirst && i < blockstogoback; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);