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 neo_get_address_from_scripthash(scripthash):
"""
Core methods for manipulating keys
NEP2 <=> WIF <=> Private => Public => ScriptHash <=> Address
Keys are arranged in order of derivation.
Arrows determine the direction.
"""
scripthash_bytes = binascii.unhexlify(reverse_hex(scripthash))
return scripthash_to_address(scripthash_bytes)
def neo_get_scripthash_from_address(address):
"""
Convert a Public Address String to a ScriptHash (Address) String.
:param address: The Public address to convert.
:type address: str
:return: String containing the converted ScriptHash.
"""
hash_bytes = binascii.hexlify(base58.b58decode_check(address))
return reverse_hex(hash_bytes[2:].decode('utf-8'))
def test_reverse_hex(self):
self.assertEqual(reverse_hex('ABCD'), 'CDAB')
self.assertEqual(reverse_hex('0000000005f5e100'), '00e1f50500000000')
def toReverseHex(self):
return reverse_hex(self.toHex())
def serialize_transaction_output(txn_output):
value = SwitcheoFixed8(float(txn_output['value'])).toReverseHex()
return reverse_hex(txn_output['assetId']) + value + reverse_hex(txn_output['scriptHash'])
def serialize_transaction_input(txn_input):
return reverse_hex(txn_input['prevHash']) + reverse_hex(num2hexstring(txn_input['prevIndex'], 2))
