def get_address(script_type: InputScriptType,
coin: CoinInfo,
node,
multisig=None) -> str:
if (script_type == InputScriptType.SPENDADDRESS
or script_type == InputScriptType.SPENDMULTISIG):
if multisig: # p2sh multisig
pubkey = node.public_key()
index = multisig_pubkey_index(multisig, pubkey)
if index is None:
raise AddressError(FailureType.ProcessError,
"Public key not found")
if coin.address_type_p2sh is None:
raise AddressError(FailureType.ProcessError,
"Multisig not enabled on this coin")
pubkeys = multisig_get_pubkeys(multisig)
address = address_multisig_p2sh(pubkeys, multisig.m, coin)
if coin.cashaddr_prefix is not None:
address = address_to_cashaddr(address, coin)
return address
if script_type == InputScriptType.SPENDMULTISIG:
raise AddressError(FailureType.ProcessError,
"Multisig details required")
# p2pkh
address = node.address(coin.address_type)
if coin.cashaddr_prefix is not None:
address = address_to_cashaddr(address, coin)
return address
elif script_type == InputScriptType.SPENDWITNESS: # native p2wpkh or native p2wsh
if not coin.segwit or not coin.bech32_prefix:
raise AddressError(FailureType.ProcessError,
"Segwit not enabled on this coin")
# native p2wsh multisig
if multisig is not None:
pubkeys = multisig_get_pubkeys(multisig)
return address_multisig_p2wsh(pubkeys, multisig.m,
coin.bech32_prefix)
# native p2wpkh
return address_p2wpkh(node.public_key(), coin)
elif (script_type == InputScriptType.SPENDP2SHWITNESS
): # p2wpkh or p2wsh nested in p2sh
if not coin.segwit or coin.address_type_p2sh is None:
raise AddressError(FailureType.ProcessError,
"Segwit not enabled on this coin")
# p2wsh multisig nested in p2sh
if multisig is not None:
pubkeys = multisig_get_pubkeys(multisig)
return address_multisig_p2wsh_in_p2sh(pubkeys, multisig.m, coin)
# p2wpkh nested in p2sh
return address_p2wpkh_in_p2sh(node.public_key(), coin)
else:
raise AddressError(FailureType.ProcessError, "Invalid script type")
def input_script_multisig(
multisig: MultisigRedeemScriptType,
signature: bytes,
signature_index: int,
sighash: int,
):
signatures = multisig.signatures # other signatures
if len(signatures[signature_index]) > 0:
raise ScriptsError("Invalid multisig parameters")
signatures[signature_index] = signature # our signature
w = bytearray()
# Starts with OP_FALSE because of an old OP_CHECKMULTISIG bug, which
# consumes one additional item on the stack:
# https://bitcoin.org/en/developer-guide#standard-transactions
w.append(0x00)
for s in signatures:
if len(s):
append_signature(w, s, sighash)
# redeem script
pubkeys = multisig_get_pubkeys(multisig)
redeem_script = output_script_multisig(pubkeys, multisig.m)
write_op_push(w, len(redeem_script))
write_bytes(w, redeem_script)
return w
def witness_p2wsh(
multisig: MultisigRedeemScriptType,
signature: bytes,
signature_index: int,
sighash: int,
):
signatures = multisig.signatures # other signatures
if len(signatures[signature_index]) > 0:
raise ScriptsError("Invalid multisig parameters")
signatures[signature_index] = signature # our signature
# filter empty
signatures = [s for s in multisig.signatures if len(s) > 0]
# witness program + signatures + redeem script
num_of_witness_items = 1 + len(signatures) + 1
w = bytearray()
write_varint(w, num_of_witness_items)
write_varint(w, 0) # version 0 witness program
for s in signatures:
append_signature(w, s, sighash) # size of the witness included
# redeem script
pubkeys = multisig_get_pubkeys(multisig)
redeem_script = output_script_multisig(pubkeys, multisig.m)
write_varint(w, len(redeem_script))
write_bytes(w, redeem_script)
return w
def input_derive_script(
txi: TxInputType,
coin: CoinInfo,
hash_type: int,
pubkey: bytes,
signature: Optional[bytes],
) -> bytes:
if txi.script_type == InputScriptType.SPENDADDRESS:
# p2pkh or p2sh
return input_script_p2pkh_or_p2sh(pubkey, signature, hash_type)
if txi.script_type == InputScriptType.SPENDP2SHWITNESS:
# p2wpkh or p2wsh using p2sh
if txi.multisig:
# p2wsh in p2sh
pubkeys = multisig_get_pubkeys(txi.multisig)
witness_script_hasher = utils.HashWriter(sha256())
write_output_script_multisig(witness_script_hasher, pubkeys, txi.multisig.m)
witness_script_hash = witness_script_hasher.get_digest()
return input_script_p2wsh_in_p2sh(witness_script_hash)
# p2wpkh in p2sh
return input_script_p2wpkh_in_p2sh(addresses.ecdsa_hash_pubkey(pubkey, coin))
elif txi.script_type == InputScriptType.SPENDWITNESS:
# native p2wpkh or p2wsh
return input_script_native_p2wpkh_or_p2wsh()
elif txi.script_type == InputScriptType.SPENDMULTISIG:
# p2sh multisig
signature_index = multisig_pubkey_index(txi.multisig, pubkey)
return input_script_multisig(
txi.multisig, signature, signature_index, hash_type, coin
)
else:
raise ScriptsError(FailureType.ProcessError, "Invalid script type")
async def step4_serialize_inputs(self) -> None:
writers.write_varint(self.serialized_tx, self.tx.inputs_count)
prefix_hash = self.h_prefix.get_digest()
for i_sign in range(self.tx.inputs_count):
progress.advance()
txi_sign = await helpers.request_tx_input(self.tx_req, i_sign, self.coin)
self.wallet_path.check_input(txi_sign)
self.multisig_fingerprint.check_input(txi_sign)
key_sign = self.keychain.derive(txi_sign.address_n)
key_sign_pub = key_sign.public_key()
if txi_sign.script_type == InputScriptType.SPENDMULTISIG:
prev_pkscript = scripts.output_script_multisig(
multisig.multisig_get_pubkeys(txi_sign.multisig),
txi_sign.multisig.m,
)
elif txi_sign.script_type == InputScriptType.SPENDADDRESS:
prev_pkscript = scripts.output_script_p2pkh(
addresses.ecdsa_hash_pubkey(key_sign_pub, self.coin)
)
else:
raise SigningError("Unsupported input script type")
h_witness = self.create_hash_writer()
writers.write_uint32(
h_witness, self.tx.version | DECRED_SERIALIZE_WITNESS_SIGNING
)
writers.write_varint(h_witness, self.tx.inputs_count)
for ii in range(self.tx.inputs_count):
if ii == i_sign:
writers.write_bytes_prefixed(h_witness, prev_pkscript)
else:
writers.write_varint(h_witness, 0)
witness_hash = writers.get_tx_hash(
h_witness, double=self.coin.sign_hash_double, reverse=False
)
h_sign = self.create_hash_writer()
writers.write_uint32(h_sign, DECRED_SIGHASH_ALL)
writers.write_bytes_fixed(h_sign, prefix_hash, writers.TX_HASH_SIZE)
writers.write_bytes_fixed(h_sign, witness_hash, writers.TX_HASH_SIZE)
sig_hash = writers.get_tx_hash(h_sign, double=self.coin.sign_hash_double)
signature = ecdsa_sign(key_sign, sig_hash)
# serialize input with correct signature
gc.collect()
script_sig = self.input_derive_script(txi_sign, key_sign_pub, signature)
writers.write_tx_input_decred_witness(
self.serialized_tx, txi_sign, script_sig
)
self.set_serialized_signature(i_sign, signature)
def derive_script_code(txi: TxInputType, pubkeyhash: bytes) -> bytearray:
if txi.multisig:
return output_script_multisig(multisig_get_pubkeys(txi.multisig),
txi.multisig.m)
p2pkh = txi.script_type == InputScriptType.SPENDADDRESS
if p2pkh:
return output_script_p2pkh(pubkeyhash)
else:
raise ZcashError(FailureType.DataError,
"Unknown input script type for zip143 script code")
def derive_script_code(self, txi: TxInputType, pubkeyhash: bytes) -> bytearray:
if txi.multisig:
return output_script_multisig(multisig_get_pubkeys(txi.multisig), txi.multisig.m)
p2pkh = (txi.script_type == InputScriptType.SPENDWITNESS or
txi.script_type == InputScriptType.SPENDP2SHWITNESS or
txi.script_type == InputScriptType.SPENDADDRESS)
if p2pkh:
# for p2wpkh in p2sh or native p2wpkh
# the scriptCode is a classic p2pkh
return output_script_p2pkh(pubkeyhash)
else:
raise Bip143Error(FailureType.DataError,
'Unknown input script type for bip143 script code')
def witness_p2wsh(
multisig: MultisigRedeemScriptType,
signature: bytes,
signature_index: int,
sighash: int,
) -> bytearray:
# get other signatures, stretch with None to the number of the pubkeys
signatures = multisig.signatures + [None] * (
multisig_get_pubkey_count(multisig) - len(multisig.signatures)
)
# fill in our signature
if signatures[signature_index]:
raise ScriptsError("Invalid multisig parameters")
signatures[signature_index] = signature
# filter empty
signatures = [s for s in signatures if s]
# witness program + signatures + redeem script
num_of_witness_items = 1 + len(signatures) + 1
# length of the redeem script
pubkeys = multisig_get_pubkeys(multisig)
redeem_script_length = output_script_multisig_length(pubkeys, multisig.m)
# length of the result
total_length = 1 + 1 # number of items, OP_FALSE
for s in signatures:
total_length += 1 + len(s) + 1 # length, signature, sighash
total_length += 1 + redeem_script_length # length, script
w = empty_bytearray(total_length)
write_varint(w, num_of_witness_items)
# Starts with OP_FALSE because of an old OP_CHECKMULTISIG bug, which
# consumes one additional item on the stack:
# https://bitcoin.org/en/developer-guide#standard-transactions
write_varint(w, 0)
for s in signatures:
append_signature(w, s, sighash) # size of the witness included
# redeem script
write_varint(w, redeem_script_length)
write_output_script_multisig(w, pubkeys, multisig.m)
return w
def witness_p2wsh(
multisig: MultisigRedeemScriptType,
signature: bytes,
signature_index: int,
sighash: int,
):
# get other signatures, stretch with None to the number of the pubkeys
signatures = multisig.signatures + [None] * (
multisig_get_pubkey_count(multisig) - len(multisig.signatures)
)
# fill in our signature
if signatures[signature_index]:
raise ScriptsError("Invalid multisig parameters")
signatures[signature_index] = signature
# filter empty
signatures = [s for s in signatures if s]
# witness program + signatures + redeem script
num_of_witness_items = 1 + len(signatures) + 1
# length of the redeem script
pubkeys = multisig_get_pubkeys(multisig)
redeem_script_length = output_script_multisig_length(pubkeys, multisig.m)
# length of the result
total_length = 1 + 1 # number of items, version
for s in signatures:
total_length += 1 + len(s) + 1 # length, signature, sighash
total_length += 1 + redeem_script_length # length, script
w = empty_bytearray(total_length)
write_varint(w, num_of_witness_items)
write_varint(w, 0) # version 0 witness program
for s in signatures:
append_signature(w, s, sighash) # size of the witness included
# redeem script
write_varint(w, redeem_script_length)
output_script_multisig(pubkeys, multisig.m, w)
return w
def input_script_multisig(
multisig: MultisigRedeemScriptType,
signature: bytes,
signature_index: int,
sighash: int,
coin: CoinInfo,
) -> bytearray:
signatures = multisig.signatures # other signatures
if len(signatures[signature_index]) > 0:
raise ScriptsError("Invalid multisig parameters")
signatures[signature_index] = signature # our signature
# length of the redeem script
pubkeys = multisig_get_pubkeys(multisig)
redeem_script_length = output_script_multisig_length(pubkeys, multisig.m)
# length of the result
total_length = 0
if utils.BITCOIN_ONLY or not coin.decred:
total_length += 1 # OP_FALSE
for s in signatures:
total_length += 1 + len(s) + 1 # length, signature, sighash
total_length += 1 + redeem_script_length # length, script
w = empty_bytearray(total_length)
if utils.BITCOIN_ONLY or not coin.decred:
# Starts with OP_FALSE because of an old OP_CHECKMULTISIG bug, which
# consumes one additional item on the stack:
# https://bitcoin.org/en/developer-guide#standard-transactions
w.append(0x00)
for s in signatures:
if len(s):
append_signature(w, s, sighash)
# redeem script
write_op_push(w, redeem_script_length)
write_output_script_multisig(w, pubkeys, multisig.m)
return w
def input_derive_script(coin: coininfo.CoinInfo,
i: TxInputType,
pubkey: bytes,
signature: bytes = None) -> bytes:
if i.script_type == InputScriptType.SPENDADDRESS:
# p2pkh or p2sh
return scripts.input_script_p2pkh_or_p2sh(pubkey, signature,
get_hash_type(coin))
if i.script_type == InputScriptType.SPENDP2SHWITNESS:
# p2wpkh or p2wsh using p2sh
if i.multisig:
# p2wsh in p2sh
pubkeys = multisig.multisig_get_pubkeys(i.multisig)
witness_script_hasher = utils.HashWriter(sha256())
scripts.output_script_multisig(pubkeys, i.multisig.m,
witness_script_hasher)
witness_script_hash = witness_script_hasher.get_digest()
return scripts.input_script_p2wsh_in_p2sh(witness_script_hash)
# p2wpkh in p2sh
return scripts.input_script_p2wpkh_in_p2sh(
addresses.ecdsa_hash_pubkey(pubkey, coin))
elif i.script_type == InputScriptType.SPENDWITNESS:
# native p2wpkh or p2wsh
return scripts.input_script_native_p2wpkh_or_p2wsh()
elif i.script_type == InputScriptType.SPENDMULTISIG:
# p2sh multisig
signature_index = multisig.multisig_pubkey_index(i.multisig, pubkey)
return scripts.input_script_multisig(i.multisig, signature,
signature_index,
get_hash_type(coin), coin)
else:
raise SigningError(FailureType.ProcessError, "Invalid script type")
async def sign_nonsegwit_input(self, i_sign: int) -> None:
# hash of what we are signing with 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()
self.write_tx_header(h_sign, self.tx, witness_marker=False)
writers.write_varint(h_sign, self.tx.inputs_count)
for i in range(self.tx.inputs_count):
# 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:
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, self.coin.curve_name)
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:
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,
)
elif txi.script_type == InputScriptType.SPENDADDRESS:
script_pubkey = scripts.output_script_p2pkh(
addresses.ecdsa_hash_pubkey(key_sign_pub, self.coin)
)
else:
raise SigningError(
FailureType.ProcessError, "Unknown transaction type"
)
txi_sign = txi
else:
script_pubkey = bytes()
self.write_tx_input(h_sign, txi, script_pubkey)
writers.write_varint(h_sign, self.tx.outputs_count)
for i in range(self.tx.outputs_count):
# STAGE_REQUEST_4_OUTPUT in legacy
txo = await helpers.request_tx_output(self.tx_req, i, self.coin)
script_pubkey = self.output_derive_script(txo)
self.write_tx_output(h_check, txo, script_pubkey)
self.write_tx_output(h_sign, txo, script_pubkey)
writers.write_uint32(h_sign, self.tx.lock_time)
writers.write_uint32(h_sign, self.get_hash_type())
# check the control digests
if self.h_confirmed.get_digest() != h_check.get_digest():
raise SigningError(
FailureType.ProcessError, "Transaction has changed during signing"
)
# compute the signature from the tx digest
signature = ecdsa_sign(
node, writers.get_tx_hash(h_sign, double=self.coin.sign_hash_double)
)
# 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)
async def sign_tx(tx: SignTx, keychain: seed.Keychain):
tx = helpers.sanitize_sign_tx(tx)
progress.init(tx.inputs_count, tx.outputs_count)
# Phase 1
h_first, hash143, segwit, authorized_in, wallet_path = await check_tx_fee(
tx, keychain)
# Phase 2
# - sign inputs
# - check that nothing changed
coin = coins.by_name(tx.coin_name)
tx_ser = TxRequestSerializedType()
txo_bin = TxOutputBinType()
tx_req = TxRequest()
tx_req.details = TxRequestDetailsType()
tx_req.serialized = None
if coin.decred:
prefix_hash = hash143.prefix_hash()
for i_sign in range(tx.inputs_count):
progress.advance()
txi_sign = None
key_sign = None
key_sign_pub = None
if segwit[i_sign]:
# STAGE_REQUEST_SEGWIT_INPUT
txi_sign = await helpers.request_tx_input(tx_req, i_sign)
if not input_is_segwit(txi_sign):
raise SigningError(FailureType.ProcessError,
"Transaction has changed during signing")
input_check_wallet_path(txi_sign, wallet_path)
key_sign = keychain.derive(txi_sign.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
txi_sign.script_sig = input_derive_script(coin, 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
writers.write_bytes(w_txi, get_tx_header(coin, tx, True))
writers.write_tx_input(w_txi, txi_sign)
tx_ser.serialized_tx = w_txi
tx_req.serialized = tx_ser
elif coin.force_bip143 or tx.overwintered:
# STAGE_REQUEST_SEGWIT_INPUT
txi_sign = await helpers.request_tx_input(tx_req, i_sign)
input_check_wallet_path(txi_sign, wallet_path)
is_bip143 = (txi_sign.script_type == InputScriptType.SPENDADDRESS
or txi_sign.script_type
== InputScriptType.SPENDMULTISIG)
if not is_bip143 or txi_sign.amount > authorized_in:
raise SigningError(FailureType.ProcessError,
"Transaction has changed during signing")
authorized_in -= txi_sign.amount
key_sign = keychain.derive(txi_sign.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
hash143_hash = hash143.preimage_hash(
coin,
tx,
txi_sign,
addresses.ecdsa_hash_pubkey(key_sign_pub, coin),
get_hash_type(coin),
)
# if multisig, check if signing with a key that is included in multisig
if txi_sign.multisig:
multisig.multisig_pubkey_index(txi_sign.multisig, key_sign_pub)
signature = ecdsa_sign(key_sign, hash143_hash)
tx_ser.signature_index = i_sign
tx_ser.signature = signature
# serialize input with correct signature
txi_sign.script_sig = input_derive_script(coin, 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
writers.write_bytes(w_txi_sign, get_tx_header(coin, tx))
writers.write_tx_input(w_txi_sign, txi_sign)
tx_ser.serialized_tx = w_txi_sign
tx_req.serialized = tx_ser
elif coin.decred:
txi_sign = await helpers.request_tx_input(tx_req, i_sign)
input_check_wallet_path(txi_sign, wallet_path)
key_sign = keychain.derive(txi_sign.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
if txi_sign.script_type == InputScriptType.SPENDMULTISIG:
prev_pkscript = scripts.output_script_multisig(
multisig.multisig_get_pubkeys(txi_sign.multisig),
txi_sign.multisig.m,
)
elif txi_sign.script_type == InputScriptType.SPENDADDRESS:
prev_pkscript = scripts.output_script_p2pkh(
addresses.ecdsa_hash_pubkey(key_sign_pub, coin))
else:
raise ValueError("Unknown input script type")
h_witness = utils.HashWriter(blake256())
writers.write_uint32(
h_witness,
tx.version | decred.DECRED_SERIALIZE_WITNESS_SIGNING)
writers.write_varint(h_witness, tx.inputs_count)
for ii in range(tx.inputs_count):
if ii == i_sign:
writers.write_varint(h_witness, len(prev_pkscript))
writers.write_bytes(h_witness, prev_pkscript)
else:
writers.write_varint(h_witness, 0)
witness_hash = writers.get_tx_hash(h_witness,
double=coin.sign_hash_double,
reverse=False)
h_sign = utils.HashWriter(blake256())
writers.write_uint32(h_sign, decred.DECRED_SIGHASHALL)
writers.write_bytes(h_sign, prefix_hash)
writers.write_bytes(h_sign, witness_hash)
sig_hash = writers.get_tx_hash(h_sign,
double=coin.sign_hash_double)
signature = ecdsa_sign(key_sign, sig_hash)
tx_ser.signature_index = i_sign
tx_ser.signature = signature
# serialize input with correct signature
txi_sign.script_sig = input_derive_script(coin, txi_sign,
key_sign_pub, signature)
w_txi_sign = writers.empty_bytearray(
8 + 4 +
len(hash143.get_last_output_bytes()) if i_sign == 0 else 0 +
16 + 4 + len(txi_sign.script_sig))
if i_sign == 0:
writers.write_bytes(w_txi_sign,
hash143.get_last_output_bytes())
writers.write_uint32(w_txi_sign, tx.lock_time)
writers.write_uint32(w_txi_sign, tx.expiry)
writers.write_varint(w_txi_sign, tx.inputs_count)
writers.write_tx_input_decred_witness(w_txi_sign, txi_sign)
tx_ser.serialized_tx = w_txi_sign
tx_req.serialized = tx_ser
else:
# hash of what we are signing with this input
h_sign = utils.HashWriter(sha256())
# same as h_first, checked before signing the digest
h_second = utils.HashWriter(sha256())
if tx.overwintered:
writers.write_uint32(
h_sign, tx.version
| zcash.OVERWINTERED) # nVersion | fOverwintered
writers.write_uint32(h_sign,
tx.version_group_id) # nVersionGroupId
else:
writers.write_uint32(h_sign, tx.version) # nVersion
if tx.timestamp:
writers.write_uint32(h_sign, tx.timestamp)
writers.write_varint(h_sign, tx.inputs_count)
for i in range(tx.inputs_count):
# STAGE_REQUEST_4_INPUT
txi = await helpers.request_tx_input(tx_req, i)
input_check_wallet_path(txi, wallet_path)
writers.write_tx_input_check(h_second, txi)
if i == i_sign:
txi_sign = txi
key_sign = keychain.derive(txi.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
# for the signing process the script_sig is equal
# to the previous tx's scriptPubKey (P2PKH) or a redeem script (P2SH)
if txi_sign.script_type == InputScriptType.SPENDMULTISIG:
txi_sign.script_sig = scripts.output_script_multisig(
multisig.multisig_get_pubkeys(txi_sign.multisig),
txi_sign.multisig.m,
)
elif txi_sign.script_type == InputScriptType.SPENDADDRESS:
txi_sign.script_sig = scripts.output_script_p2pkh(
addresses.ecdsa_hash_pubkey(key_sign_pub, coin))
if coin.bip115:
txi_sign.script_sig += scripts.script_replay_protection_bip115(
txi_sign.prev_block_hash_bip115,
txi_sign.prev_block_height_bip115,
)
else:
raise SigningError(FailureType.ProcessError,
"Unknown transaction type")
else:
txi.script_sig = bytes()
writers.write_tx_input(h_sign, txi)
writers.write_varint(h_sign, tx.outputs_count)
for o in range(tx.outputs_count):
# STAGE_REQUEST_4_OUTPUT
txo = await helpers.request_tx_output(tx_req, o)
txo_bin.amount = txo.amount
txo_bin.script_pubkey = output_derive_script(
txo, coin, keychain)
writers.write_tx_output(h_second, txo_bin)
writers.write_tx_output(h_sign, txo_bin)
writers.write_uint32(h_sign, tx.lock_time)
if tx.overwintered:
writers.write_uint32(h_sign, tx.expiry) # expiryHeight
writers.write_varint(h_sign, 0) # nJoinSplit
writers.write_uint32(h_sign, get_hash_type(coin))
# check the control digests
if writers.get_tx_hash(h_first,
False) != writers.get_tx_hash(h_second):
raise SigningError(FailureType.ProcessError,
"Transaction has changed during signing")
# if multisig, check if signing with a key that is included in multisig
if txi_sign.multisig:
multisig.multisig_pubkey_index(txi_sign.multisig, key_sign_pub)
# compute the signature from the tx digest
signature = ecdsa_sign(
key_sign,
writers.get_tx_hash(h_sign, double=coin.sign_hash_double))
tx_ser.signature_index = i_sign
tx_ser.signature = signature
# serialize input with correct signature
txi_sign.script_sig = input_derive_script(coin, 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
writers.write_bytes(w_txi_sign, get_tx_header(coin, tx))
writers.write_tx_input(w_txi_sign, txi_sign)
tx_ser.serialized_tx = w_txi_sign
tx_req.serialized = tx_ser
if coin.decred:
return await helpers.request_tx_finish(tx_req)
for o in range(tx.outputs_count):
progress.advance()
# STAGE_REQUEST_5_OUTPUT
txo = await helpers.request_tx_output(tx_req, o)
txo_bin.amount = txo.amount
txo_bin.script_pubkey = output_derive_script(txo, coin, keychain)
# serialize output
w_txo_bin = writers.empty_bytearray(5 + 8 + 5 +
len(txo_bin.script_pubkey) + 4)
if o == 0: # serializing first output => prepend outputs count
writers.write_varint(w_txo_bin, tx.outputs_count)
writers.write_tx_output(w_txo_bin, txo_bin)
tx_ser.signature_index = None
tx_ser.signature = None
tx_ser.serialized_tx = w_txo_bin
tx_req.serialized = tx_ser
any_segwit = True in segwit.values()
for i in range(tx.inputs_count):
progress.advance()
if segwit[i]:
# STAGE_REQUEST_SEGWIT_WITNESS
txi = await helpers.request_tx_input(tx_req, i)
input_check_wallet_path(txi, wallet_path)
if not input_is_segwit(txi) or txi.amount > authorized_in:
raise SigningError(FailureType.ProcessError,
"Transaction has changed during signing")
authorized_in -= txi.amount
key_sign = keychain.derive(txi.address_n, coin.curve_name)
key_sign_pub = key_sign.public_key()
hash143_hash = hash143.preimage_hash(
coin,
tx,
txi,
addresses.ecdsa_hash_pubkey(key_sign_pub, coin),
get_hash_type(coin),
)
signature = ecdsa_sign(key_sign, hash143_hash)
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(txi.multisig, signature,
signature_index,
get_hash_type(coin))
else:
witness = scripts.witness_p2wpkh(signature, key_sign_pub,
get_hash_type(coin))
tx_ser.serialized_tx = witness
tx_ser.signature_index = i
tx_ser.signature = signature
elif any_segwit:
tx_ser.serialized_tx = bytearray(
1) # empty witness for non-segwit inputs
tx_ser.signature_index = None
tx_ser.signature = None
tx_req.serialized = tx_ser
writers.write_uint32(tx_ser.serialized_tx, tx.lock_time)
if tx.overwintered:
if tx.version == 3:
writers.write_uint32(tx_ser.serialized_tx,
tx.expiry) # expiryHeight
writers.write_varint(tx_ser.serialized_tx, 0) # nJoinSplit
elif tx.version == 4:
writers.write_uint32(tx_ser.serialized_tx,
tx.expiry) # expiryHeight
writers.write_uint64(tx_ser.serialized_tx, 0) # valueBalance
writers.write_varint(tx_ser.serialized_tx, 0) # nShieldedSpend
writers.write_varint(tx_ser.serialized_tx, 0) # nShieldedOutput
writers.write_varint(tx_ser.serialized_tx, 0) # nJoinSplit
else:
raise SigningError(
FailureType.DataError,
"Unsupported version for overwintered transaction",
)
await helpers.request_tx_finish(tx_req)
