def test_num2hexstring(self):
self.assertEqual(num2hexstring(0), '00')
self.assertEqual(num2hexstring(255), 'ff')
self.assertEqual(num2hexstring(256, size=2, little_endian=True),
'0001')
self.assertEqual(num2hexstring(2222, size=2, little_endian=True),
'ae08')
def create_offer_hash(neo_address, offer_asset_hash, offer_asset_amt, want_asset_hash, want_asset_amt, txn_uuid):
reverse_user_hash = reverse_hex(neo_get_scripthash_from_address(neo_address))
reverse_offer_asset_hash = reverse_hex(offer_asset_hash)
reverse_offer_amount = num2hexstring(number=offer_asset_amt, size=8, little_endian=True)
reverse_want_asset_hash = reverse_hex(want_asset_hash)
reverse_want_amount = num2hexstring(number=want_asset_amt, size=8, little_endian=True)
nonce_hex = txn_uuid.encode('utf-8').hex()
offer_key_bytes = reverse_user_hash + reverse_offer_asset_hash + reverse_want_asset_hash + reverse_offer_amount +\
reverse_want_amount + nonce_hex
offer_hash = reverse_hex(Crypto.Hash256(binascii.a2b_hex(offer_key_bytes)).hex())
return offer_hash
def serialize_transaction_attribute(attr):
if len(attr['data']) > max_transaction_attribute_size:
raise ValueError('Transaction attribute data is larger than the Maximum allowed attribute size.')
out = num2hexstring(attr['usage'])
if attr['usage'] == 0x81:
out += num2hexstring(len(attr['data']) / 2)
elif attr['usage'] == 0x90 or attr['usage'] >= 0xf0:
out += num2varint(len(attr['data']) / 2)
if attr['usage'] == 0x02 or attr['usage'] == 0x03:
out += attr['data'][2:64]
else:
out += attr['data']
return out
def serialize_transaction(transaction, signed=True):
serialized_txn = ''
serialized_txn += str(num2hexstring(transaction['type']))
serialized_txn += str(num2hexstring(transaction['version']))
serialized_txn += str(serialize_exclusive[transaction['type']](transaction))
serialized_txn += str(num2varint(len(transaction['attributes'])))
for attribute in transaction['attributes']:
serialized_txn += serialize_transaction_attribute(attribute)
serialized_txn += str(num2varint(len(transaction['inputs'])))
for txn_input in transaction['inputs']:
serialized_txn += serialize_transaction_input(txn_input)
serialized_txn += str(num2varint(len(transaction['outputs'])))
for txn_output in transaction['outputs']:
serialized_txn += serialize_transaction_output(txn_output)
if signed and transaction['scripts'] and len(transaction['scripts']) > 0:
serialized_txn += str(num2varint(len(transaction['scripts'])))
for script in transaction['scripts']:
serialized_txn += serialize_witness(script)
return serialized_txn
def serialize_transaction_input(txn_input):
return reverse_hex(txn_input['prevHash']) + reverse_hex(num2hexstring(txn_input['prevIndex'], 2))