def generate_tx_nonce(seller: Address, client: Address) -> str:
"""
Generate a unique hash to distinguish txs with the same terms.
:param seller: the address of the seller.
:param client: the address of the client.
:return: return the hash in hex.
"""
time_stamp = int(time.time())
aggregate_hash = hashlib.sha256(
b"".join([seller.encode(), client.encode(), time_stamp.to_bytes(32, "big")])
)
return aggregate_hash.hexdigest()
def generate_tx_nonce(self, seller: Address, client: Address) -> str:
"""
Generate a random str message.
:param seller: the address of the seller.
:param client: the address of the client.
:return: return the hash in hex.
"""
time_stamp = int(time.time())
aggregate_hash = sha256_hash(b"".join(
[seller.encode(),
client.encode(),
time_stamp.to_bytes(32, "big")]))
return aggregate_hash.hex()
def _get_hash(
tx_sender_addr: Address,
tx_counterparty_addr: Address,
good_ids: List[int],
sender_supplied_quantities: List[int],
counterparty_supplied_quantities: List[int],
tx_amount: int,
tx_nonce: int,
) -> bytes:
"""
Generate a hash from transaction information.
:param tx_sender_addr: the sender address
:param tx_counterparty_addr: the counterparty address
:param good_ids: the list of good ids
:param sender_supplied_quantities: the quantities supplied by the sender (must all be positive)
:param counterparty_supplied_quantities: the quantities supplied by the counterparty (must all be positive)
:param tx_amount: the amount of the transaction
:param tx_nonce: the nonce of the transaction
:return: the hash
"""
aggregate_hash = Web3.keccak(
b"".join(
[
good_ids[0].to_bytes(32, "big"),
sender_supplied_quantities[0].to_bytes(32, "big"),
counterparty_supplied_quantities[0].to_bytes(32, "big"),
]
)
)
for i in range(len(good_ids)):
if not i == 0:
aggregate_hash = Web3.keccak(
b"".join(
[
aggregate_hash,
good_ids[i].to_bytes(32, "big"),
sender_supplied_quantities[i].to_bytes(32, "big"),
counterparty_supplied_quantities[i].to_bytes(32, "big"),
]
)
)
m_list = [] # type: List[bytes]
m_list.append(tx_sender_addr.encode("utf-8"))
m_list.append(tx_counterparty_addr.encode("utf-8"))
m_list.append(aggregate_hash)
m_list.append(tx_amount.to_bytes(32, "big"))
m_list.append(tx_nonce.to_bytes(32, "big"))
return Web3.keccak(b"".join(m_list))
