def _check_txs_out(self):
# Check for negative or overflow output values
nValueOut = 0
for tx_out in self.txs_out:
if tx_out.coin_value < 0 or tx_out.coin_value > self.MAX_MONEY:
raise ValidationFailureError("tx_out value negative or out of range")
nValueOut += tx_out.coin_value
if nValueOut > self.MAX_MONEY:
raise ValidationFailureError("tx_out lack_amount out of range")
def _check_txs_in(self):
# Check for duplicate inputs
if [x for x in self.txs_in if self.txs_in.count(x) > 1]:
raise ValidationFailureError("duplicate inputs")
if (self.is_coinbase()):
if not (2 <= len(self.txs_in[0].script) <= 100):
raise ValidationFailureError("bad coinbase script size")
else:
refs = set()
for tx_in in self.txs_in:
if tx_in.previous_hash == ZERO32:
raise ValidationFailureError("prevout is null")
pair = (tx_in.previous_hash, tx_in.previous_index)
if pair in refs:
raise ValidationFailureError("spendable reused")
refs.add(pair)
def verify_tx_in(self, tx_in_idx, tx_out_script, expected_hash_type=None):
tx_in = self.txs_in[tx_in_idx]
def signature_for_hash_type_f(hash_type, script):
return self.signature_hash(script, tx_in_idx, hash_type)
if not tx_in.verify(
tx_out_script, signature_for_hash_type_f, expected_hash_type, tx_version=self.version):
raise ValidationFailureError(
"just signed script Tx %s TransactionIn index %d did not verify" % (
b2h_rev(tx_in.previous_hash), tx_in_idx))
def _check_size_limit(self):
size = len(self.as_bin())
if size > self.MAX_TX_SIZE:
raise ValidationFailureError("size > MAX_TX_SIZE")
def _check_tx_inout_count(self):
if not self.txs_out:
raise ValidationFailureError("txs_out = []")
if not self.is_coinbase() and not self.txs_in:
raise ValidationFailureError("txs_in = []")