replace sha256 with pedersen_hash in get_key (#46)

* replace sha256 with pedersen_hash

* fix: prevent an OOB

* workaround timeout in unit test

* update go-ipa and reduce the timeout

* fix for unit tests: do not call NewAccessWitness in NewEVMTxContext (#49)

* potential fix: do not call NewAccessWitness in NewEVMTxContext

* more fixes: check for the existence of Accesses

* fix absence of witness in copy

* fix another witness issue

* workaround: ensure the prefetcher is off in verkle mode

* fix the remaining issues in tests

* review feedback

* fix witness allocation in stateless test

core/state_processor.go

@@ -95,6 +95,9 @@ func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg
 func applyTransaction(msg types.Message, config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, blockNumber *big.Int, blockHash common.Hash, tx *types.Transaction, usedGas *uint64, evm *vm.EVM) (*types.Receipt, error) {
 	// Create a new context to be used in the EVM environment.
 	txContext := NewEVMTxContext(msg)
+	if config.IsCancun(blockNumber) {
+		txContext.Accesses = types.NewAccessWitness()
+	}
 	evm.Reset(txContext, statedb)
 
 	// Apply the transaction to the current state (included in the env).