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core/vm: reuse Keccak-256 hashes across opcode executions (#17863)

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This commit is contained in:
Péter Szilágyi
2018-10-08 14:14:29 +03:00
committed by Felix Lange
parent c5cb214f68
commit 1d3d4a4d57
3 changed files with 49 additions and 7 deletions
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19
core/vm/instructions.go
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@ -24,7 +24,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/sha3"
"github.com/ethereum/go-ethereum/params"
)
@ -373,13 +373,20 @@ func opSAR(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *
func opSha3(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset, size := stack.pop(), stack.pop()
data := memory.Get(offset.Int64(), size.Int64())
hash := crypto.Keccak256(data)
evm := interpreter.evm
if evm.vmConfig.EnablePreimageRecording {
evm.StateDB.AddPreimage(common.BytesToHash(hash), data)
if interpreter.hasher == nil {
interpreter.hasher = sha3.NewKeccak256().(keccakState)
} else {
interpreter.hasher.Reset()
}
stack.push(interpreter.intPool.get().SetBytes(hash))
interpreter.hasher.Write(data)
interpreter.hasher.Read(interpreter.hasherBuf[:])
evm := interpreter.evm
if evm.vmConfig.EnablePreimageRecording {
evm.StateDB.AddPreimage(interpreter.hasherBuf, data)
}
stack.push(interpreter.intPool.get().SetBytes(interpreter.hasherBuf[:]))
interpreter.intPool.put(offset, size)
return nil, nil