def stream(self, f, blank_solutions=False, include_unspents=False, include_witness_data=True):
"""Stream a Bitcoin transaction Tx to the file-like object f.
:param f: writable file-like object to stream binary data of transaction
:param blank_solutions: (optional) clear out the solutions scripts, effectively "unsigning" the
transaction before writing it. Defaults to False
:param include_unspents: (optional) stread out the Spendable objects after streaming the transaction.
This is a pycoin-specific extension. Defaults to False.
:param include_witness_data: (optional) stream segwit transactions including the witness data if the
transaction has any witness data. Defaults to True.
"""
include_witnesses = include_witness_data and self.has_witness_data()
stream_struct("L", f, self.version)
if include_witnesses:
f.write(b'\0\1')
stream_struct("I", f, len(self.txs_in))
for t in self.txs_in:
t.stream(f, blank_solutions=blank_solutions)
stream_struct("I", f, len(self.txs_out))
for t in self.txs_out:
t.stream(f)
if include_witnesses:
for tx_in in self.txs_in:
witness = tx_in.witness
stream_struct("I", f, len(witness))
for w in witness:
stream_satoshi_string(f, w)
stream_struct("L", f, self.lock_time)
if include_unspents and not self.missing_unspents():
self.stream_unspents(f)
def stream(self,
f,
blank_solutions=False,
include_unspents=False,
include_witness_data=True):
"""Stream a Bitcoin transaction Tx to the file-like object f.
:param f: writable file-like object to stream binary data of transaction
:param blank_solutions: (optional) clear out the solutions scripts, effectively "unsigning" the
transaction before writing it. Defaults to False
:param include_unspents: (optional) stread out the Spendable objects after streaming the transaction.
This is a pycoin-specific extension. Defaults to False.
:param include_witness_data: (optional) stream segwit transactions including the witness data if the
transaction has any witness data. Defaults to True.
"""
include_witnesses = include_witness_data and self.has_witness_data()
stream_struct("L", f, self.version)
if include_witnesses:
f.write(b'\0\1')
stream_struct("I", f, len(self.txs_in))
for t in self.txs_in:
t.stream(f, blank_solutions=blank_solutions)
stream_struct("I", f, len(self.txs_out))
for t in self.txs_out:
t.stream(f)
if include_witnesses:
for tx_in in self.txs_in:
witness = tx_in.witness
stream_struct("I", f, len(witness))
for w in witness:
stream_satoshi_string(f, w)
stream_struct("L", f, self.lock_time)
if include_unspents and not self.missing_unspents():
self.stream_unspents(f)
def hash_for_signing(self, msg):
"""
Return a hash of msg, according to odd bitcoin method: double SHA256 over a bitcoin
encoded stream of two strings: a fixed magic prefix and the actual message.
"""
magic = self.msg_magic_for_netcode()
fd = io.BytesIO()
stream_satoshi_string(fd, magic.encode('utf8'))
stream_satoshi_string(fd, msg.encode('utf8'))
# return as a number, since it's an input to signing algos like that anyway
return from_bytes_32(double_sha256(fd.getvalue()))
def hash_for_signing(self, msg):
"""
Return a hash of msg, according to odd bitcoin method: double SHA256 over a bitcoin
encoded stream of two strings: a fixed magic prefix and the actual message.
"""
magic = self.msg_magic_for_netcode()
fd = io.BytesIO()
stream_satoshi_string(fd, magic.encode('utf8'))
stream_satoshi_string(fd, msg.encode('utf8'))
# return as a number, since it's an input to signing algos like that anyway
return from_bytes_32(double_sha256(fd.getvalue()))
def _segwit_signature_preimage(self, script, tx_in_idx, hash_type):
f = io.BytesIO()
stream_struct("L", f, self.tx.version)
# calculate hash prevouts
f.write(self._hash_prevouts(hash_type))
f.write(self._hash_sequence(hash_type))
tx_in = self.tx.txs_in[tx_in_idx]
f.write(tx_in.previous_hash)
stream_struct("L", f, tx_in.previous_index)
tx_out = self.tx.unspents[tx_in_idx]
stream_satoshi_string(f, script)
stream_struct("Q", f, tx_out.coin_value)
stream_struct("L", f, tx_in.sequence)
f.write(self._hash_outputs(hash_type, tx_in_idx))
stream_struct("L", f, self.tx.lock_time)
stream_struct("L", f, hash_type)
return f.getvalue()
def _segwit_signature_preimage(self, script, tx_in_idx, hash_type):
f = io.BytesIO()
stream_struct("L", f, self.tx.version)
# calculate hash prevouts
f.write(self._hash_prevouts(hash_type))
f.write(self._hash_sequence(hash_type))
tx_in = self.tx.txs_in[tx_in_idx]
f.write(tx_in.previous_hash)
stream_struct("L", f, tx_in.previous_index)
tx_out = self.tx.unspents[tx_in_idx]
stream_satoshi_string(f, script)
stream_struct("Q", f, tx_out.coin_value)
stream_struct("L", f, tx_in.sequence)
f.write(self._hash_outputs(hash_type, tx_in_idx))
stream_struct("L", f, self.tx.lock_time)
stream_struct("L", f, hash_type)
return f.getvalue()