feat: ✨ eth: calculate slot hash (#88)

Signed-off-by: thanhpp <thanhphanphu18@gmail.com>

pkg/eth/slothash.go

@@ -0,0 +1,25 @@
+package eth
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+func OverrideSet(stateDiff map[common.Hash]common.Hash, storageSlot int, key common.Hash) {
+	// for a set the first slot is used to store the array to support enumerable.
+	// The slot right after it is used to store the map (need to override this map).
+	OverrideMap(stateDiff, storageSlot+1, key, common.BigToHash(common.Big1))
+}
+
+func OverrideVariable(stateDiff map[common.Hash]common.Hash, storageSlot int, value common.Hash) {
+	slotHash := common.BigToHash(big.NewInt(int64(storageSlot)))
+	stateDiff[slotHash] = value
+}
+
+func OverrideMap(stateDiff map[common.Hash]common.Hash, storageSlot int, key, value common.Hash) {
+	overrideSlot32 := common.BigToHash(big.NewInt(int64(storageSlot)))
+	overrideSlotHash := crypto.Keccak256Hash(key[:], overrideSlot32[:])
+	stateDiff[overrideSlotHash] = value
+}