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Use SipHash-2-4 for CCoinsCache index

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This is ~1.7x slower than the Lookup3-of-Xor-with-salt construct we were
using before, but it is a primitive designed for exactly this.
This commit is contained in:
Pieter Wuille
2016-05-06 20:47:12 +02:00
parent 0b1295b066
commit 382c871d28
4 changed files with 13 additions and 76 deletions
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6
src/coins.cpp
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@@ -56,7 +56,11 @@ void CCoinsViewBacked::SetBackend(CCoinsView &viewIn) { base = &viewIn; }
bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return base->BatchWrite(mapCoins, hashBlock); }
CCoinsViewCursor *CCoinsViewBacked::Cursor() const { return base->Cursor(); }
CCoinsKeyHasher::CCoinsKeyHasher() : salt(GetRandHash()) {}
SaltedTxidHasher::SaltedTxidHasher()
{
GetRandBytes((unsigned char*)&k0, sizeof(k0));
GetRandBytes((unsigned char*)&k1, sizeof(k1));
}
CCoinsViewCache::CCoinsViewCache(CCoinsView *baseIn) : CCoinsViewBacked(baseIn), hasModifier(false), cachedCoinsUsage(0) { }