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Code Issues Releases Wiki Activity

core/sign_tx: Factor out get_legacy_tx_digest() from sign_nonsegwit_input().

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Andrew Kozlik 2020-06-22 14:58:10 +02:00 committed by Andrew Kozlik
parent 61e2d4d5e5
commit 78f14d286e
1 changed files with 41 additions and 32 deletions
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41
core/src/apps/bitcoin/sign_tx/bitcoin.py
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@ -23,7 +23,8 @@ from . import helpers, progress, tx_weight
from .matchcheck import MultisigFingerprintChecker, WalletPathChecker
if False:
from typing import Set, Tuple, Union
from typing import Set, Optional, Tuple, Union
from trezor.crypto.bip32 import HDNode
# Default signature hash type in Bitcoin which signs all inputs and all outputs of the transaction.
_SIGHASH_ALL = const(0x01)
@ -258,8 +259,10 @@ class Bitcoin:
scripts.witness_p2wpkh(signature, public_key, self.get_hash_type(txi))
)
async def sign_nonsegwit_input(self, i_sign: int) -> None:
# hash of what we are signing with this input
async def get_legacy_tx_digest(
self, index: int, script_pubkey: Optional[bytes] = None
) -> Tuple[bytes, TxInputType, Optional[HDNode]]:
# the transaction digest which gets signed for this input
h_sign = self.create_hash_writer()
# should come out the same as h_confirmed, checked before signing the digest
h_check = self.create_hash_writer()
@ -271,17 +274,19 @@ class Bitcoin:
# STAGE_REQUEST_4_INPUT in legacy
txi = await helpers.request_tx_input(self.tx_req, i, self.coin)
writers.write_tx_input_check(h_check, txi)
if i == i_sign:
# Only the previous UTXO's scriptPubKey is included in h_sign.
if i == index:
txi_sign = txi
node = None
if not script_pubkey:
self.wallet_path.check_input(txi)
self.multisig_fingerprint.check_input(txi)
# NOTE: wallet_path is checked in write_tx_input_check()
node = self.keychain.derive(txi.address_n)
key_sign_pub = node.public_key()
# if multisig, do a sanity check to ensure we are signing with a key that is included in the multisig
if txi.multisig:
# Sanity check to ensure we are signing with a key that is included in the multisig.
multisig.multisig_pubkey_index(txi.multisig, key_sign_pub)
# For the signing process the previous UTXO's scriptPubKey is included in h_sign.
if txi.script_type == InputScriptType.SPENDMULTISIG:
script_pubkey = scripts.output_script_multisig(
multisig.multisig_get_pubkeys(txi.multisig), txi.multisig.m,
@ -292,10 +297,9 @@ class Bitcoin:
)
else:
raise wire.ProcessError("Unknown transaction type")
txi_sign = txi
else:
script_pubkey = bytes()
self.write_tx_input(h_sign, txi, script_pubkey)
else:
self.write_tx_input(h_sign, txi, bytes())
write_bitcoin_varint(h_sign, self.tx.outputs_count)
@ -313,16 +317,21 @@ class Bitcoin:
if self.h_confirmed.get_digest() != h_check.get_digest():
raise wire.ProcessError("Transaction has changed during signing")
tx_digest = writers.get_tx_hash(h_sign, double=self.coin.sign_hash_double)
return tx_digest, txi_sign, node
async def sign_nonsegwit_input(self, i: int) -> None:
tx_digest, txi, node = await self.get_legacy_tx_digest(i)
assert node is not None
# compute the signature from the tx digest
signature = ecdsa_sign(
node, writers.get_tx_hash(h_sign, double=self.coin.sign_hash_double)
)
signature = ecdsa_sign(node, tx_digest)
# serialize input with correct signature
gc.collect()
script_sig = self.input_derive_script(txi_sign, key_sign_pub, signature)
self.write_tx_input(self.serialized_tx, txi_sign, script_sig)
self.set_serialized_signature(i_sign, signature)
script_sig = self.input_derive_script(txi, node.public_key(), signature)
self.write_tx_input(self.serialized_tx, txi, script_sig)
self.set_serialized_signature(i, signature)
async def serialize_output(self, i: int) -> None:
# STAGE_REQUEST_5_OUTPUT in legacy