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Code Issues Releases Wiki Activity

core/sign_tx: Use a preallocated buffer for transaction serialization.

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This commit is contained in:
Andrew Kozlik 2020-04-14 20:05:01 +02:00 committed by Andrew Kozlik
parent 555259d6a9
commit 2ceb091d68
4 changed files with 51 additions and 78 deletions
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13
core/src/apps/wallet/sign_tx/bitcoinlike.py
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@ -80,16 +80,11 @@ class Bitcoinlike(signing.Bitcoin):
txi_sign.script_sig = self.input_derive_script(
txi_sign, key_sign_pub, signature
)
w_txi_sign = writers.empty_bytearray(
5 + len(txi_sign.prev_hash) + 4 + len(txi_sign.script_sig) + 4
)
if i_sign == 0: # serializing first input => prepend headers
self.write_sign_tx_header(w_txi_sign, True in self.segwit.values())
writers.write_tx_input(w_txi_sign, txi_sign)
self.tx_ser.signature_index = i_sign
self.tx_ser.signature = signature
self.tx_ser.serialized_tx = w_txi_sign
self.tx_req.serialized = self.tx_ser
self.write_sign_tx_header(self.serialized_tx, True in self.segwit.values())
writers.write_tx_input(self.serialized_tx, txi_sign)
self.tx_req.serialized.signature_index = i_sign
self.tx_req.serialized.signature = signature
def on_negative_fee(self) -> None:
# some coins require negative fees for reward TX

38
core/src/apps/wallet/sign_tx/decred.py
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@ -78,16 +78,10 @@ class Decred(Bitcoin):
await super().process_input(i, txi)
# Decred serializes inputs early.
w_txi = writers.empty_bytearray(8 if i == 0 else 0 + 9 + len(txi.prev_hash))
if i == 0: # serializing first input => prepend headers
self.write_sign_tx_header(w_txi, False)
self.write_sign_tx_header(self.serialized_tx, False)
self.write_tx_input(w_txi, txi)
self.tx_ser.signature_index = None
self.tx_ser.signature = None
self.tx_ser.serialized_tx = w_txi
self.tx_req.serialized = self.tx_ser
self.write_tx_input(self.serialized_tx, txi)
async def confirm_output(
self, i: int, txo: TxOutputType, txo_bin: TxOutputBinType
@ -99,17 +93,11 @@ class Decred(Bitcoin):
)
txo_bin.decred_script_version = txo.decred_script_version
w_txo_bin = writers.empty_bytearray(4 + 8 + 2 + 4 + len(txo_bin.script_pubkey))
if i == 0: # serializing first output => prepend outputs count
writers.write_varint(w_txo_bin, self.tx.outputs_count)
writers.write_varint(self.serialized_tx, self.tx.outputs_count)
self.hash143.add_output_count(self.tx)
writers.write_tx_output(w_txo_bin, txo_bin)
self.tx_ser.signature_index = None
self.tx_ser.signature = None
self.tx_ser.serialized_tx = w_txo_bin
self.tx_req.serialized = self.tx_ser
writers.write_tx_output(self.serialized_tx, txo_bin)
await super().confirm_output(i, txo, txo_bin)
@ -169,21 +157,15 @@ class Decred(Bitcoin):
txi_sign, key_sign_pub, signature
)
max_witness_size = 8 + 4 + 4 + 4 + len(txi_sign.script_sig)
if i_sign == 0:
w_txi_sign = writers.empty_bytearray(4 + 4 + 4 + max_witness_size)
writers.write_uint32(w_txi_sign, self.tx.lock_time)
writers.write_uint32(w_txi_sign, self.tx.expiry)
writers.write_varint(w_txi_sign, self.tx.inputs_count)
else:
w_txi_sign = writers.empty_bytearray(max_witness_size)
writers.write_uint32(self.serialized_tx, self.tx.lock_time)
writers.write_uint32(self.serialized_tx, self.tx.expiry)
writers.write_varint(self.serialized_tx, self.tx.inputs_count)
writers.write_tx_input_decred_witness(w_txi_sign, txi_sign)
writers.write_tx_input_decred_witness(self.serialized_tx, txi_sign)
self.tx_ser.signature_index = i_sign
self.tx_ser.signature = signature
self.tx_ser.serialized_tx = w_txi_sign
self.tx_req.serialized = self.tx_ser
self.tx_req.serialized.signature_index = i_sign
self.tx_req.serialized.signature = signature
async def step5_serialize_outputs(self) -> None:
pass

20
core/src/apps/wallet/sign_tx/helpers.py
View File

@ -117,7 +117,9 @@ def request_tx_meta(tx_req: TxRequest, coin: CoinInfo, tx_hash: bytes = None) ->
tx_req.details.tx_hash = tx_hash
tx_req.details.request_index = None
ack = yield tx_req
tx_req.serialized = None
tx_req.serialized.signature = None
tx_req.serialized.signature_index = None
tx_req.serialized.serialized_tx[:] = bytes()
gc.collect()
return sanitize_tx_meta(ack.tx, coin)
@ -131,7 +133,9 @@ def request_tx_extra_data( # type: ignore
tx_req.details.tx_hash = tx_hash
tx_req.details.request_index = None
ack = yield tx_req
tx_req.serialized = None
tx_req.serialized.signature = None
tx_req.serialized.signature_index = None
tx_req.serialized.serialized_tx[:] = bytes()
tx_req.details.extra_data_offset = None
tx_req.details.extra_data_len = None
gc.collect()
@ -143,7 +147,9 @@ def request_tx_input(tx_req: TxRequest, i: int, coin: CoinInfo, tx_hash: bytes =
tx_req.details.request_index = i
tx_req.details.tx_hash = tx_hash
ack = yield tx_req
tx_req.serialized = None
tx_req.serialized.signature = None
tx_req.serialized.signature_index = None
tx_req.serialized.serialized_tx[:] = bytes()
gc.collect()
return sanitize_tx_input(ack.tx, coin)
@ -153,7 +159,9 @@ def request_tx_output(tx_req: TxRequest, i: int, coin: CoinInfo, tx_hash: bytes
tx_req.details.request_index = i
tx_req.details.tx_hash = tx_hash
ack = yield tx_req
tx_req.serialized = None
tx_req.serialized.signature = None
tx_req.serialized.signature_index = None
tx_req.serialized.serialized_tx[:] = bytes()
gc.collect()
if tx_hash is None:
return sanitize_tx_output(ack.tx, coin)
@ -165,7 +173,9 @@ def request_tx_finish(tx_req: TxRequest) -> Awaitable[Any]: # type: ignore
tx_req.request_type = TXFINISHED
tx_req.details = None
yield tx_req
tx_req.serialized = None
tx_req.serialized.signature = None
tx_req.serialized.signature_index = None
tx_req.serialized.serialized_tx[:] = bytes()
gc.collect()

58
core/src/apps/wallet/sign_tx/signing.py
View File

@ -40,6 +40,9 @@ _BIP32_CHANGE_CHAIN = const(1)
# use and still allow to quickly brute-force the correct bip32 path
_BIP32_MAX_LAST_ELEMENT = const(1000000)
# the number of bytes to preallocate for serialized transaction chunks
_MAX_SERIALIZED_CHUNK_SIZE = const(2048)
class SigningError(ValueError):
pass
@ -98,15 +101,19 @@ class Bitcoin:
# dict of booleans stating if input is segwit
self.segwit = {} # type: Dict[int, bool]
# amounts
self.total_in = 0 # sum of input amounts
self.bip143_in = 0 # sum of segwit input amounts
self.total_out = 0 # sum of output amounts
self.change_out = 0 # change output amount
self.weight = tx_weight.TxWeightCalculator(tx.inputs_count, tx.outputs_count)
# transaction and signature serialization
self.serialized_tx = writers.empty_bytearray(_MAX_SERIALIZED_CHUNK_SIZE)
self.tx_req = TxRequest()
self.tx_req.details = TxRequestDetailsType()
self.tx_ser = TxRequestSerializedType()
self.tx_req.serialized = TxRequestSerializedType()
self.tx_req.serialized.serialized_tx = self.serialized_tx
# h_confirmed is used to make sure that the inputs and outputs streamed for
# confirmation in Steps 1 and 2 are the same as the ones streamed for signing
@ -180,11 +187,10 @@ class Bitcoin:
await self.sign_segwit_input(i)
elif any_segwit:
# add empty witness for non-segwit inputs
self.tx_ser.serialized_tx.append(0)
self.tx_req.serialized = self.tx_ser
self.serialized_tx.append(0)
async def step7_finish(self) -> None:
self.write_sign_tx_footer(self.tx_ser.serialized_tx)
self.write_sign_tx_footer(self.serialized_tx)
await helpers.request_tx_finish(self.tx_req)
async def process_input(self, i: int, txi: TxInputType) -> None:
@ -259,16 +265,9 @@ class Bitcoin:
key_sign_pub = key_sign.public_key()
txi_sign.script_sig = self.input_derive_script(txi_sign, key_sign_pub)
w_txi = writers.empty_bytearray(
7 + len(txi_sign.prev_hash) + 4 + len(txi_sign.script_sig) + 4
)
if i_sign == 0: # serializing first input => prepend headers
self.write_sign_tx_header(w_txi, True)
self.write_tx_input(w_txi, txi_sign)
self.tx_ser.signature_index = None
self.tx_ser.signature = None
self.tx_ser.serialized_tx = w_txi
self.tx_req.serialized = self.tx_ser
self.write_sign_tx_header(self.serialized_tx, True)
self.write_tx_input(self.serialized_tx, txi_sign)
async def sign_segwit_input(self, i: int) -> None:
# STAGE_REQUEST_SEGWIT_WITNESS
@ -297,18 +296,16 @@ class Bitcoin:
if txi.multisig:
# find out place of our signature based on the pubkey
signature_index = multisig.multisig_pubkey_index(txi.multisig, key_sign_pub)
witness = scripts.witness_p2wsh(
self.serialized_tx[:] = scripts.witness_p2wsh(
txi.multisig, signature, signature_index, self.get_hash_type()
)
else:
witness = scripts.witness_p2wpkh(
self.serialized_tx[:] = scripts.witness_p2wpkh(
signature, key_sign_pub, self.get_hash_type()
)
self.tx_ser.signature_index = i
self.tx_ser.signature = signature
self.tx_ser.serialized_tx = witness
self.tx_req.serialized = self.tx_ser
self.tx_req.serialized.signature_index = i
self.tx_req.serialized.signature = signature
async def sign_nonsegwit_input(self, i_sign: int) -> None:
# hash of what we are signing with this input
@ -381,17 +378,12 @@ class Bitcoin:
txi_sign.script_sig = self.input_derive_script(
txi_sign, key_sign_pub, signature
)
w_txi_sign = writers.empty_bytearray(
5 + len(txi_sign.prev_hash) + 4 + len(txi_sign.script_sig) + 4
)
if i_sign == 0: # serializing first input => prepend headers
self.write_sign_tx_header(w_txi_sign, True in self.segwit.values())
self.write_tx_input(w_txi_sign, txi_sign)
self.write_sign_tx_header(self.serialized_tx, True in self.segwit.values())
self.write_tx_input(self.serialized_tx, txi_sign)
self.tx_ser.signature_index = i_sign
self.tx_ser.signature = signature
self.tx_ser.serialized_tx = w_txi_sign
self.tx_req.serialized = self.tx_ser
self.tx_req.serialized.signature_index = i_sign
self.tx_req.serialized.signature = signature
async def serialize_output(self, i: int) -> None:
# STAGE_REQUEST_5_OUTPUT
@ -400,15 +392,9 @@ class Bitcoin:
txo_bin.amount = txo.amount
txo_bin.script_pubkey = self.output_derive_script(txo)
w_txo_bin = writers.empty_bytearray(5 + 8 + 5 + len(txo_bin.script_pubkey) + 4)
if i == 0: # serializing first output => prepend outputs count
writers.write_varint(w_txo_bin, self.tx.outputs_count)
writers.write_tx_output(w_txo_bin, txo_bin)
self.tx_ser.signature_index = None
self.tx_ser.signature = None
self.tx_ser.serialized_tx = w_txo_bin
self.tx_req.serialized = self.tx_ser
writers.write_varint(self.serialized_tx, self.tx.outputs_count)
writers.write_tx_output(self.serialized_tx, txo_bin)
async def get_prevtx_output_value(self, prev_hash: bytes, prev_index: int) -> int:
amount_out = 0 # output amount