def serialize_input(self, i, for_sig=None):
txin = self.inputs[i]
s = []
s.append(txin['prevout_hash'].decode('hex')[::-1].encode(
'hex')) # prev hash
s.append(int_to_hex(txin['prevout_n'], 4)) # prev index
p2sh = txin.get('redeemScript') is not None
num_sig = txin['num_sig']
address = txin['address']
x_signatures = txin['signatures']
signatures = filter(lambda x: x is not None, x_signatures)
is_complete = len(signatures) == num_sig
if for_sig in [-1, None]:
# if we have enough signatures, we use the actual pubkeys
# use extended pubkeys (with bip32 derivation)
sig_list = []
if for_sig == -1:
# we assume that signature will be 0x48 bytes long
pubkeys = txin['pubkeys']
sig_list = ["00" * 0x48] * num_sig
elif is_complete:
pubkeys = txin['pubkeys']
for signature in signatures:
sig_list.append(signature + '01')
else:
pubkeys = txin['x_pubkeys']
for signature in x_signatures:
sig_list.append((
signature +
'01') if signature is not None else NO_SIGNATURE)
sig_list = ''.join(map(lambda x: push_script(x), sig_list))
if not p2sh:
script = sig_list
x_pubkey = pubkeys[0]
if x_pubkey is None:
addrtype, h160 = bc_address_to_hash_160(txin['address'])
x_pubkey = 'fd' + (chr(addrtype) + h160).encode('hex')
script += push_script(x_pubkey)
else:
script = '00' # op_0
script += sig_list
redeem_script = multisig_script(pubkeys, num_sig)
script += push_script(redeem_script)
elif for_sig == i:
script = txin['redeemScript'] if p2sh else self.pay_script(
'address', address)
else:
script = ''
s.append(var_int(len(script) / 2)) # script length
s.append(script)
s.append("ffffffff") # sequence
return ''.join(s)
def serialize(self, for_sig=None):
"""Serialize transaction as a hex-encoded string.
Args: for_sig: If this serialization is for signing.
Has the following possible values:
- -1 : do not sign, estimate length
- >=0 : serialized tx for signing input i
- None : add all known signatures
"""
inputs = self.inputs
outputs = self.outputs
# field, field data(data_overridden_by_chainhook)
fields = [('version', []),
('vin', []),
('inputs', []),
('vout', []),
('outputs', []),
('locktime', []),
('hashtype', [])
]
run_chainhook('transaction_serialize', self, for_sig, fields)
for i, (field, field_data) in enumerate(fields):
if not field_data:
if field == 'version':
field_data.append(int_to_hex(1,4))
elif field == 'vin':
field_data.append(var_int(len(inputs)))
elif field == 'inputs':
for i in range(len(inputs)):
field_data.append(self.serialize_input(i, for_sig))
elif field == 'vout':
field_data.append(var_int(len(outputs)))
elif field == 'outputs':
for output in outputs:
field_data.append(self.serialize_output(output, for_sig))
elif field == 'locktime':
field_data.append(int_to_hex(0,4))
elif field == 'hashtype':
if for_sig is not None and for_sig != -1:
field_data.append(int_to_hex(1,4))
s = []
for field, field_data in fields:
s.append(''.join(field_data))
return ''.join(s)
def serialize_output(self, output, for_sig=None):
s = []
type, addr, amount = output
s.append(int_to_hex(amount, 8)) # amount
script = self.pay_script(type, addr)
s.append(var_int(len(script) / 2)) # script length
s.append(script) # script
return ''.join(s)
def serialize_output(self, output, for_sig=None):
s = []
type, addr, amount = output
s.append(int_to_hex( amount, 8)) # amount
script = self.pay_script(type, addr)
s.append(var_int( len(script)/2 )) # script length
s.append(script) # script
return ''.join(s)
def serialize_input(self, i, for_sig=None):
txin = self.inputs[i]
s = []
s.append( txin['prevout_hash'].decode('hex')[::-1].encode('hex') ) # prev hash
s.append( int_to_hex(txin['prevout_n'],4) ) # prev index
p2sh = txin.get('redeemScript') is not None
num_sig = txin['num_sig']
address = txin['address']
x_signatures = txin['signatures']
signatures = filter(lambda x: x is not None, x_signatures)
is_complete = len(signatures) == num_sig
if for_sig in [-1, None]:
# if we have enough signatures, we use the actual pubkeys
# use extended pubkeys (with bip32 derivation)
sig_list = []
if for_sig == -1:
# we assume that signature will be 0x48 bytes long
pubkeys = txin['pubkeys']
sig_list = [ "00"* 0x48 ] * num_sig
elif is_complete:
pubkeys = txin['pubkeys']
for signature in signatures:
sig_list.append(signature + '01')
else:
pubkeys = txin['x_pubkeys']
for signature in x_signatures:
sig_list.append((signature + '01') if signature is not None else NO_SIGNATURE)
sig_list = ''.join( map( lambda x: push_script(x), sig_list))
if not p2sh:
script = sig_list
x_pubkey = pubkeys[0]
if x_pubkey is None:
addrtype, h160 = bc_address_to_hash_160(txin['address'])
x_pubkey = 'fd' + (chr(addrtype) + h160).encode('hex')
script += push_script(x_pubkey)
else:
script = '00' # op_0
script += sig_list
redeem_script = multisig_script(pubkeys,num_sig)
script += push_script(redeem_script)
elif for_sig==i:
script = txin['redeemScript'] if p2sh else self.pay_script('address', address)
else:
script = ''
s.append(var_int( len(script)/2 )) # script length
s.append(script)
s.append("ffffffff") # sequence
return ''.join(s)
def serialize(self, for_sig=None):
"""Serialize transaction as a hex-encoded string.
Args: for_sig: If this serialization is for signing.
Has the following possible values:
- -1 : do not sign, estimate length
- >=0 : serialized tx for signing input i
- None : add all known signatures
"""
inputs = self.inputs
outputs = self.outputs
# field, field data(data_overridden_by_chainhook)
fields = [('version', []), ('vin', []), ('inputs', []), ('vout', []),
('outputs', []), ('locktime', []), ('hashtype', [])]
run_chainhook('transaction_serialize', self, for_sig, fields)
for i, (field, field_data) in enumerate(fields):
if not field_data:
if field == 'version':
field_data.append(int_to_hex(1, 4))
elif field == 'vin':
field_data.append(var_int(len(inputs)))
elif field == 'inputs':
for i in range(len(inputs)):
field_data.append(self.serialize_input(i, for_sig))
elif field == 'vout':
field_data.append(var_int(len(outputs)))
elif field == 'outputs':
for output in outputs:
field_data.append(
self.serialize_output(output, for_sig))
elif field == 'locktime':
field_data.append(int_to_hex(0, 4))
elif field == 'hashtype':
if for_sig is not None and for_sig != -1:
field_data.append(int_to_hex(1, 4))
s = []
for field, field_data in fields:
s.append(''.join(field_data))
return ''.join(s)
def msg_magic(message):
varint = var_int(len(message))
encoded_varint = "".join(
[chr(int(varint[i:i + 2], 16)) for i in xrange(0, len(varint), 2)])
return "\x18Bitcoin Signed Message:\n" + encoded_varint + message