def input_check_multisig_fingerprint(
txi: TxInputType, multisig_fp: multisig.MultisigFingerprint
) -> None:
if multisig_fp.mismatch is False:
# All inputs in Phase 1 had matching multisig fingerprints, allowing a multisig change-output.
if not txi.multisig or not multisig_fp.matches(txi.multisig):
# This input no longer has a matching multisig fingerprint.
raise SigningError(
FailureType.ProcessError, "Transaction has changed during signing"
)
def output_is_change(
o: TxOutputType, wallet_path: list, multisig_fp: multisig.MultisigFingerprint,
) -> bool:
if o.script_type not in helpers.CHANGE_OUTPUT_SCRIPT_TYPES:
return False
if o.multisig and not multisig_fp.matches(o.multisig):
return False
return (
wallet_path is not None
and wallet_path == o.address_n[:-_BIP32_WALLET_DEPTH]
and o.address_n[-2] <= _BIP32_CHANGE_CHAIN
and o.address_n[-1] <= _BIP32_MAX_LAST_ELEMENT
)
def output_is_change(
o: TxOutputType,
wallet_path: list,
segwit_in: int,
multifp: multisig.MultisigFingerprint,
) -> bool:
if o.multisig and not multifp.matches(o.multisig):
return False
if output_is_segwit(o) and o.amount > segwit_in:
# if the output is segwit, make sure it doesn't spend more than what the
# segwit inputs paid. this is to prevent user being tricked into
# creating ANYONECANSPEND outputs before full segwit activation.
return False
return (wallet_path is not None
and wallet_path == o.address_n[:-_BIP32_WALLET_DEPTH]
and o.address_n[-2] <= _BIP32_CHANGE_CHAIN
and o.address_n[-1] <= _BIP32_MAX_LAST_ELEMENT)