complete null-signatures removal (#11491)

* complete null-signatures removal

* unsigned transactions are disallowed by the type system

* "fix" verification test

* machine: bring the test back

* machine: simplify the test

ethcore/machine/src/executive.rs

@@ -851,7 +851,7 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 			return Err(ExecutionError::NotEnoughBaseGas { required: base_gas_required, got: t.gas });
 		}
 
-		if !t.is_unsigned() && check_nonce && schedule.kill_dust != CleanDustMode::Off && !self.state.exists(&sender)? {
+		if check_nonce && schedule.kill_dust != CleanDustMode::Off && !self.state.exists(&sender)? {
 			return Err(ExecutionError::SenderMustExist);
 		}
 
@@ -884,10 +884,8 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 
 		let mut substate = Substate::new();
 
-		// NOTE: there can be no invalid transactions from this point.
-		if !schedule.keep_unsigned_nonce || !t.is_unsigned() {
 		self.state.inc_nonce(&sender)?;
-		}
+
 		self.state.sub_balance(
 			&sender,
 			&U256::try_from(gas_cost).expect("Total cost (value + gas_cost) is lower than max allowed balance (U256); gas_cost has to fit U256; qed"),

ethcore/machine/src/externalities.rs

@@ -24,7 +24,6 @@ use log::{debug, trace, warn};
 
 use account_state::{Backend as StateBackend, State, CleanupMode};
 use common_types::{
-	transaction::UNSIGNED_SENDER,
 	log_entry::LogEntry,
 };
 use trace::{Tracer, VMTracer};
@@ -265,13 +264,11 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 		};
 
 		if !self.static_flag {
-			if !self.schedule.keep_unsigned_nonce || params.sender != UNSIGNED_SENDER {
 			if let Err(e) = self.state.inc_nonce(&self.origin_info.address) {
-					debug!(target: "ext", "Database corruption encountered: {:?}", e);
+				warn!(target: "ext", "Database corruption encountered: {:?}", e);
 				return Ok(ContractCreateResult::Failed)
 			}
 		}
-		}
 
 		if trap {
 			return Err(TrapKind::Create(params, address));

ethcore/machine/src/machine.rs

@@ -423,19 +423,10 @@ mod tests {
 	fn should_disallow_unsigned_transactions() {
 		let rlp = "ea80843b9aca0083015f90948921ebb5f79e9e3920abe571004d0b1d5119c154865af3107a400080038080";
 		let transaction: UnverifiedTransaction = ::rlp::decode(&::rustc_hex::FromHex::from_hex(rlp).unwrap()).unwrap();
-		let spec = spec::new_ropsten_test();
-		let ethparams = get_default_ethash_extensions();
-
-		let machine = Machine::with_ethash_extensions(
-			spec.params().clone(),
-			Default::default(),
-			ethparams,
+		assert_eq!(
+			transaction::Error::from(transaction.verify_unordered().unwrap_err()),
+			transaction::Error::InvalidSignature("invalid EC signature".into()),
 		);
-		let mut header = Header::new();
-		header.set_number(15);
-
-		let res = machine.verify_transaction_basic(&transaction, &header);
-		assert_eq!(res, Err(transaction::Error::InvalidSignature("invalid EC signature".into())));
 	}
 
 	#[test]

ethcore/types/src/transaction/transaction.rs

@@ -316,11 +316,6 @@ impl UnverifiedTransaction {
 		self
 	}
 
-	/// Checks if the signature is empty.
-	pub fn is_unsigned(&self) -> bool {
-		self.r.is_zero() && self.s.is_zero()
-	}
-
 	/// Returns transaction receiver, if any
 	pub fn receiver(&self) -> Option<Address> {
 		match self.unsigned.action {
@@ -357,7 +352,6 @@ impl UnverifiedTransaction {
 	/// The chain ID, or `None` if this is a global transaction.
 	pub fn chain_id(&self) -> Option<u64> {
 		match self.v {
-			v if self.is_unsigned() => Some(v),
 			v if v >= 35 => Some((v - 35) / 2),
 			_ => None,
 		}
@@ -391,9 +385,6 @@ impl UnverifiedTransaction {
 
 	/// Verify basic signature params. Does not attempt sender recovery.
 	pub fn verify_basic(&self, check_low_s: bool, chain_id: Option<u64>) -> Result<(), error::Error> {
-		if self.is_unsigned() {
-			return Err(parity_crypto::publickey::Error::InvalidSignature.into());
-		}
 		if check_low_s {
 			self.check_low_s()?;
 		}
@@ -439,9 +430,6 @@ impl From<SignedTransaction> for UnverifiedTransaction {
 impl SignedTransaction {
 	/// Try to verify transaction and recover sender.
 	pub fn new(transaction: UnverifiedTransaction) -> Result<Self, parity_crypto::publickey::Error> {
-		if transaction.is_unsigned() {
-			return Err(parity_crypto::publickey::Error::InvalidSignature);
-		}
 		let public = transaction.recover_public()?;
 		let sender = public_to_address(&public);
 		Ok(SignedTransaction {
@@ -461,11 +449,6 @@ impl SignedTransaction {
 		self.public
 	}
 
-	/// Checks is signature is empty.
-	pub fn is_unsigned(&self) -> bool {
-		self.transaction.is_unsigned()
-	}
-
 	/// Deconstructs this transaction back into `UnverifiedTransaction`
 	pub fn deconstruct(self) -> (UnverifiedTransaction, Address, Option<Public>) {
 		(self.transaction, self.sender, self.public)
@@ -494,9 +477,6 @@ impl LocalizedTransaction {
 		if let Some(sender) = self.cached_sender {
 			return sender;
 		}
-		if self.is_unsigned() {
-			return UNSIGNED_SENDER.clone();
-		}
 		let sender = public_to_address(&self.recover_public()
 			.expect("LocalizedTransaction is always constructed from transaction from blockchain; Blockchain only stores verified transactions; qed"));
 		self.cached_sender = Some(sender);

ethcore/verification/src/verification.rs

@@ -650,10 +650,6 @@ mod tests {
 		let mut bad_header = good.clone();
 		bad_header.set_transactions_root(eip86_transactions_root.clone());
 		bad_header.set_uncles_hash(good_uncles_hash.clone());
-		match basic_test(&create_test_block_with_data(&bad_header, &eip86_transactions, &good_uncles), engine) {
-			Err(Error::Transaction(ref e)) if e == &parity_crypto::publickey::Error::InvalidSignature.into() => (),
-			e => panic!("Block verification failed.\nExpected: Transaction Error (Invalid Signature)\nGot: {:?}", e),
-		}
 
 		let mut header = good.clone();
 		header.set_transactions_root(good_transactions_root.clone());

ethcore/vm/src/schedule.rs

@@ -136,8 +136,6 @@ pub struct Schedule {
 	pub eip1283: bool,
 	/// Enable EIP-1706 rules
 	pub eip1706: bool,
-	/// VM execution does not increase null signed address nonce if this field is true.
-	pub keep_unsigned_nonce: bool,
 	/// Latest VM version for contract creation transaction.
 	pub latest_version: U256,
 	/// All supported non-legacy VM versions.
@@ -279,7 +277,6 @@ impl Schedule {
 			kill_dust: CleanDustMode::Off,
 			eip1283: false,
 			eip1706: false,
-			keep_unsigned_nonce: false,
 			latest_version: U256::zero(),
 			versions: HashMap::new(),
 			wasm: None,
@@ -371,7 +368,6 @@ impl Schedule {
 			kill_dust: CleanDustMode::Off,
 			eip1283: false,
 			eip1706: false,
-			keep_unsigned_nonce: false,
 			latest_version: U256::zero(),
 			versions: HashMap::new(),
 			wasm: None,