Use SipHash-2-4 for CCoinsCache index

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.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/coins.cpp b/src/coins.cpp
index 1c329740b4..b7dd293d69 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -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) { }