def create_p2pkh_transaction(private_key,
unspents,
outputs,
custom_pushdata=False):
public_key = private_key.public_key
public_key_len = len(public_key).to_bytes(1, byteorder='little')
scriptCode = private_key.scriptcode
scriptCode_len = int_to_varint(len(scriptCode))
version = VERSION_1
lock_time = LOCK_TIME
# sequence = SEQUENCE
hash_type = HASH_TYPE
input_count = int_to_unknown_bytes(len(unspents), byteorder='little')
output_count = int_to_unknown_bytes(len(outputs), byteorder='little')
output_block = construct_output_block(outputs,
custom_pushdata=custom_pushdata)
# Optimize for speed, not memory, by pre-computing values.
inputs = []
for unspent in unspents:
script = hex_to_bytes(unspent.script)
script_len = int_to_unknown_bytes(len(script), byteorder='little')
txid = hex_to_bytes(unspent.txid)[::-1]
txindex = unspent.txindex.to_bytes(4, byteorder='little')
amount = unspent.amount.to_bytes(8, byteorder='little')
inputs.append(TxIn(script, script_len, txid, txindex, amount))
hashPrevouts = double_sha256(b''.join([i.txid + i.txindex
for i in inputs]))
hashSequence = double_sha256(b''.join([SEQUENCE for i in inputs]))
hashOutputs = double_sha256(output_block)
# scriptCode_len is part of the script.
for i, txin in enumerate(inputs):
to_be_hashed = (version + hashPrevouts + hashSequence + txin.txid +
txin.txindex + scriptCode_len + scriptCode +
txin.amount + SEQUENCE + hashOutputs + lock_time +
hash_type)
hashed = sha256(to_be_hashed) # BIP-143: Used for Bitcoin Cash
# signature = private_key.sign(hashed) + b'\x01'
signature = private_key.sign(hashed) + b'\x41'
script_sig = (len(signature).to_bytes(1, byteorder='little') +
signature + public_key_len + public_key)
inputs[i].script = script_sig
inputs[i].script_len = int_to_unknown_bytes(len(script_sig),
byteorder='little')
return bytes_to_hex(version + input_count + construct_input_block(inputs) +
output_count + output_block + lock_time)
def calc_txid(tx_hex):
return bytes_to_hex(double_sha256(hex_to_bytes(tx_hex))[::-1])
def test_flip_hex_byte_order():
assert flip_hex_byte_order(bytes_to_hex(BYTES_LITTLE)) == HEX
def test_upper(self):
assert bytes_to_hex(BYTES_BIG, upper=True) == HEX.upper()
def test_default(self):
assert bytes_to_hex(BYTES_BIG) == HEX
def test_correct(self):
assert bytes.fromhex(bytes_to_hex(BYTES_BIG)) == BYTES_BIG