def input_script(self, txin, estimate_size=False):
type_ = txin.type()
if type_ == ScriptType.P2PKH:
return Transaction.get_preimage_script_bytes(
txin).hex()
if type_ == ScriptType.MULTISIG_P2SH:
# Multisig verification has partial support, but is
# disabled. This is the expected serialization though, so we
# leave it here until we activate it.
return '00' + \
push_script(Transaction.get_preimage_script_bytes(txin).hex())
raise RuntimeError(f'unsupported type {type_}')
def sign_transaction(self, tx: Transaction, password: str,
tx_context: TransactionContext) -> None:
if tx.is_complete():
return
assert self.handler is not None
client = self.get_client()
inputs: List[YInput] = []
inputsPaths = []
chipInputs = []
redeemScripts = []
signatures = []
changePath = ""
changeAmount = None
output = None
outputAmount = None
pin = ""
self.get_client(
) # prompt for the PIN before displaying the dialog if necessary
# Fetch inputs of the transaction to sign
foundP2SHSpend = False
allSpendsAreP2SH = True
for txin in tx.inputs:
foundP2SHSpend = foundP2SHSpend or txin.type(
) == ScriptType.MULTISIG_P2SH
allSpendsAreP2SH = allSpendsAreP2SH and txin.type(
) == ScriptType.MULTISIG_P2SH
for i, x_pubkey in enumerate(txin.x_pubkeys):
if self.is_signature_candidate(x_pubkey):
txin_xpub_idx = i
inputPath = "%s/%d/%d" % (self.get_derivation()[2:],
*x_pubkey.bip32_path())
break
else:
self.give_error("No matching x_key for sign_transaction"
) # should never happen
inputs.append(
YInput(txin.value, Transaction.get_preimage_script_bytes(txin),
txin_xpub_idx, txin.sequence))
inputsPaths.append(inputPath)
# Sanity check
if foundP2SHSpend and not allSpendsAreP2SH:
self.give_error(
"P2SH / regular input mixed in same transaction not supported")
# Concatenate all the tx outputs as binary
txOutput = pack_list(tx.outputs, XTxOutput.to_bytes)
# Recognize outputs - only one output and one change is authorized
if not foundP2SHSpend:
keystore_fingerprint = self.get_fingerprint()
assert tx.output_info is not None
for tx_output, output_metadatas in zip(tx.outputs, tx.output_info):
info = output_metadatas.get(keystore_fingerprint)
if (info is not None) and len(tx.outputs) != 1:
key_derivation, xpubs, m = info
key_subpath = compose_chain_string(key_derivation)[1:]
changePath = self.get_derivation()[2:] + key_subpath
changeAmount = tx_output.value
else:
output = classify_tx_output(tx_output)
outputAmount = tx_output.value
self.handler.show_message(
_("Confirm Transaction on your Ledger device..."))
try:
for i, utxo in enumerate(inputs):
txin = tx.inputs[i]
sequence = int_to_hex(utxo.sequence, 4)
prevout_bytes = txin.prevout_bytes()
value_bytes = prevout_bytes + pack_le_int64(utxo.value)
chipInputs.append({
'value': value_bytes,
'witness': True,
'sequence': sequence
})
redeemScripts.append(utxo.script_sig)
# Sign all inputs
inputIndex = 0
rawTx = tx.serialize()
self.get_client().enableAlternate2fa(False)
self.get_client().startUntrustedTransaction(
True, inputIndex, chipInputs, redeemScripts[inputIndex])
outputData = self.get_client().finalizeInputFull(txOutput)
outputData['outputData'] = txOutput
transactionOutput = outputData['outputData']
if outputData['confirmationNeeded']:
outputData['address'] = cast(ScriptTemplate,
output).to_string()
self.handler.finished()
# the authenticate dialog and returns pin
auth_pin = self.handler.get_auth(self, outputData)
if not auth_pin:
raise UserWarning()
pin = auth_pin
self.handler.show_message(
_("Confirmed. Signing Transaction..."))
while inputIndex < len(inputs):
singleInput = [chipInputs[inputIndex]]
self.get_client().startUntrustedTransaction(
False, 0, singleInput, redeemScripts[inputIndex])
inputSignature = self.get_client().untrustedHashSign(
inputsPaths[inputIndex],
pin,
lockTime=tx.locktime,
sighashType=tx.nHashType())
inputSignature[0] = 0x30 # force for 1.4.9+
signatures.append(inputSignature)
inputIndex = inputIndex + 1
except UserWarning:
self.handler.show_error(_('Cancelled by user'))
return
except BTChipException as e:
if e.sw == 0x6985: # cancelled by user
return
else:
logger.exception("")
self.give_error(e, True)
except Exception as e:
logger.exception("")
self.give_error(e, True)
finally:
self.handler.finished()
for txin, input, signature in zip(tx.inputs, inputs, signatures):
txin.signatures[input.txin_xpub_idx] = signature
