def _is_address_valid(self, address):
"""Checks is an address string is valid"""
digits_58_pattern = r'[^123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]'
# check for invalid characters
if re.search(digits_58_pattern, address):
return False
# check for length (26-35 characters)
# TODO: need to confirm the possible length!
if len(address) < 26 or len(address) > 35:
return False
# get data, network_prefix and checksum
data_checksum = b58decode(address.encode('utf-8'))
data = data_checksum[:-4]
network_prefix = data_checksum[:1]
checksum = data_checksum[-4:]
# check correct network (depending on address type)
if self.get_type() == P2PKH_ADDRESS:
if network_prefix != NETWORK_P2PKH_PREFIXES[get_network()]:
return False
elif self.get_type() == P2SH_ADDRESS:
if network_prefix != NETWORK_P2SH_PREFIXES[get_network()]:
return False
# check address' checksum
data_hash = hashlib.sha256(hashlib.sha256(data).digest()).digest()
if data_hash[0:4] != checksum:
return False
return True
def __init__(self, rpcuser=None, rpcpassword=None, host=None, port=None):
"""Connects to node using credentials given
Parameters
----------
rpcuser : str
as defined in bitcoin.conf
rpcpassword : str
as defined in bitcoin.conf
host : str, optional
host where the Bitcoin node resides; defaults to 127.0.0.1
port : int, optional
port to connect to; uses default ports according to network
Raises
------
ValueError
if rpcuser and/or rpcpassword are not specified
"""
if not rpcuser or not rpcpassword:
raise ValueError('rpcuser or rpcpassword is missing')
if not host:
host = '127.0.0.1'
if not port:
port = NETWORK_DEFAULT_PORTS[get_network()]
self.proxy = AuthServiceProxy("http://{}:{}@{}:{}".format(rpcuser, rpcpassword, host, port))
def to_wif(self, compressed=True):
"""Returns key in WIFC or WIF string
| Pseudocode:
| network_prefix = (1 byte version number)
| data = network_prefix + (32 bytes number/key) [ + 0x01 if compressed ]
| data_hash = SHA-256( SHA-256( data ) )
| checksum = (first 4 bytes of data_hash)
| wif = Base58CheckEncode( data + checksum )
"""
# add network prefix to the key
data = NETWORK_WIF_PREFIXES[get_network()] + self.to_bytes()
if compressed == True:
data += b'\x01'
# double hash and get the first 4 bytes for checksum
data_hash = hashlib.sha256(hashlib.sha256(data).digest()).digest()
checksum = data_hash[0:4]
# suffix the key bytes with the checksum and encode to base58check
wif = b58encode(data + checksum)
return wif.decode('utf-8')
def to_string(self):
"""Returns as address string
Uses a segwit's python reference implementation for now. (TODO)
"""
# convert hex string hash to int array (required by bech32 lib)
hash_bytes = unhexlify( self.witness_hash.encode('utf-8') )
witness_int_array = memoryview(hash_bytes).tolist()
return bitcoinutils.bech32.encode(NETWORK_SEGWIT_PREFIXES[get_network()],
self.segwit_num_version, witness_int_array)
def to_string(self):
"""Returns as address string
| Pseudocode:
| network_prefix = (1 byte version number)
| data = network_prefix + hash160_bytes
| data_hash = SHA-256( SHA-256( hash160_bytes ) )
| checksum = (first 4 bytes of data_hash)
| address_bytes = Base58CheckEncode( data + checksum )
"""
hash160_encoded = self.hash160.encode('utf-8')
hash160_bytes = unhexlify(hash160_encoded)
if self.get_type() == P2PKH_ADDRESS:
data = NETWORK_P2PKH_PREFIXES[get_network()] + hash160_bytes
elif self.get_type() == P2SH_ADDRESS:
data = NETWORK_P2SH_PREFIXES[get_network()] + hash160_bytes
data_hash = hashlib.sha256(hashlib.sha256(data).digest()).digest()
checksum = data_hash[0:4]
address_bytes = b58encode(data + checksum)
return address_bytes.decode('utf-8')
def _address_to_hash(self, address):
"""Converts an address to it's hash equivalent
The size of the address determines between P2WPKH and P2WSH.
Then Bech32 decodes the address removing network prefix, checksum,
witness version.
Uses a segwit's python reference implementation for now. (TODO)
"""
witness_version, witness_int_array = bitcoinutils.bech32.decode(
NETWORK_SEGWIT_PREFIXES[get_network()], address)
if witness_version == None:
raise ValueError("Invalid value for parameter address.")
if witness_version != self.segwit_num_version:
raise TypeError("Invalid segwit version.")
return hexlify(bytes(witness_int_array)).decode('utf-8')
def _from_wif(self, wif):
"""Creates key from WIFC or WIF format key
Check to_wif for the detailed process. From WIF is the reverse.
Raises
------
ValueError
if the checksum is wrong or if the WIF/WIFC is not from the
configured network.
"""
wif_utf = wif.encode('utf-8')
# decode base58check get key bytes plus checksum
data_bytes = b58decode(wif_utf)
key_bytes = data_bytes[:-4]
checksum = data_bytes[-4:]
# verify key with checksum
data_hash = hashlib.sha256(hashlib.sha256(key_bytes).digest()).digest()
if not checksum == data_hash[0:4]:
raise ValueError('Checksum is wrong. Possible mistype?')
# get network prefix and check with current setup
network_prefix = key_bytes[:1]
if NETWORK_WIF_PREFIXES[get_network()] != network_prefix:
raise ValueError('Using the wrong network!')
# remove network prefix
key_bytes = key_bytes[1:]
# check length of bytes and if > 32 then compressed
# use this to instantite an ecdsa key
if len(key_bytes) > 32:
self.key = SigningKey.from_string(key_bytes[:-1], curve=SECP256k1)
else:
self.key = SigningKey.from_string(key_bytes, curve=SECP256k1)
def init_network():
if setup.get_network() == None:
setup.setup(consts.network)
