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Merge pull request #2312 from gmaxwell/random_random

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ApproximateBestSubset internal RNG to prevent degenerate behavior.
This commit is contained in:
Gavin Andresen
2013-02-22 08:57:38 -08:00
parent 1167af7e5c 907a2aa4c7
commit aaeb443791
4 changed files with 111 additions and 13 deletions
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26
src/util.cpp
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@@ -1281,12 +1281,26 @@ void AddTimeData(const CNetAddr& ip, int64 nTime)
}
}
uint32_t insecure_rand_Rz = 11;
uint32_t insecure_rand_Rw = 11;
void seed_insecure_rand(bool fDeterministic)
{
//The seed values have some unlikely fixed points which we avoid.
if(fDeterministic)
{
insecure_rand_Rz = insecure_rand_Rw = 11;
} else {
uint32_t tmp;
do{
RAND_bytes((unsigned char*)&tmp,4);
}while(tmp==0 || tmp==0x9068ffffU);
insecure_rand_Rz=tmp;
do{
RAND_bytes((unsigned char*)&tmp,4);
}while(tmp==0 || tmp==0x464fffffU);
insecure_rand_Rw=tmp;
}
}
string FormatVersion(int nVersion)
{