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consensus/ethash: implement faster difficulty calculators (#21976)

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This PR adds re-written difficulty calculators, which are based on uint256. It also adds a fuzzer + oss-fuzz integration for the new fuzzer. It does differential fuzzing between the new and old calculators.

Note: this PR does not actually enable the new calculators.
This commit is contained in:
Martin Holst Swende
2020-12-11 11:06:44 +01:00
committed by GitHub
parent 88c696240d
commit efe6dd2904
6 changed files with 469 additions and 0 deletions
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5
consensus/ethash/consensus.go
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@@ -485,6 +485,11 @@ func calcDifficultyFrontier(time uint64, parent *types.Header) *big.Int {
return diff
}
// Exported for fuzzing
var FrontierDifficultyCalulator = calcDifficultyFrontier
var HomesteadDifficultyCalulator = calcDifficultyHomestead
var DynamicDifficultyCalculator = makeDifficultyCalculator
// VerifySeal implements consensus.Engine, checking whether the given block satisfies
// the PoW difficulty requirements.
func (ethash *Ethash) VerifySeal(chain consensus.ChainHeaderReader, header *types.Header) error {