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Introduce FastRandomContext::randbool()

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This commit is contained in:
Pieter Wuille 2017-02-17 16:32:16 -08:00
parent 4bd0e9b90a
commit c21cbe61c6
2 changed files with 5 additions and 1 deletions
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4
src/random.h
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@ -42,6 +42,10 @@ public:
return (Rw << 16) + Rz; return (Rw << 16) + Rz;
} }
bool randbool() {
return rand32() & 1;
}
uint32_t Rz; uint32_t Rz;
uint32_t Rw; uint32_t Rw;
}; };

2
src/wallet/wallet.cpp
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@ -2048,7 +2048,7 @@ static void ApproximateBestSubset(const std::vector<std::pair<CAmount, std::pair
//that the rng is fast. We do not use a constant random sequence, //that the rng is fast. We do not use a constant random sequence,
//because there may be some privacy improvement by making //because there may be some privacy improvement by making
//the selection random. //the selection random.
if (nPass == 0 ? insecure_rand.rand32()&1 : !vfIncluded[i]) if (nPass == 0 ? insecure_rand.randbool() : !vfIncluded[i])
{ {
nTotal += vValue[i].first; nTotal += vValue[i].first;
vfIncluded[i] = true; vfIncluded[i] = true;