Python ecdsa.ellipticcurve.INFINITY Examples

The following are 4 code examples of ecdsa.ellipticcurve.INFINITY(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module ecdsa.ellipticcurve , or try the search function .
Example #1
Source File: hd_public_key.py    From ontology-python-sdk with GNU Lesser General Public License v3.0 6 votes vote down vote up 
def from_parent(parent_key, i):
        if i & HARDENED_INDEX:
            raise ValueError("Can't generate a hardened child key from a parent public key.")

        child = hmac.new(parent_key.chain_code,
                         parent_key.compressed_key + i.to_bytes(length=4, byteorder='big'),
                         hashlib.sha512).digest()
        child_left, child_right = child[:32], child[32:]
        if int.from_bytes(child_left, 'big') >= ecdsa.generator_256.order():
            return None

        temp_pri_key = SigningKey.from_string(string=child_left, curve=curves.NIST256p)

        ki = temp_pri_key.verifying_key.pubkey.point + parent_key.key.pubkey.point
        if ki == ellipticcurve.INFINITY:
            return None

        return HDPublicKey(public_key=VerifyingKey.from_public_point(point=ki, curve=curves.NIST256p),
                           chain_code=child_right,
                           index=i,
                           depth=parent_key.depth + 1,
                           parent_fingerprint=parent_key.fingerprint)
Example #2
Source File: hd.py    From btcpy with GNU Lesser General Public License v3.0 5 votes vote down vote up 
def get_child(self, index, hardened=False):
        left, right = self.get_hash(index, hardened)
        point = ((left * generator_secp256k1)
                 + VerifyingKey.from_string(self.key.uncompressed[1:], curve=SECP256k1).pubkey.point)
        if point == INFINITY:
            raise ValueError('Computed point equals INFINITY')
        return ExtendedPublicKey(PublicKey.from_point(point), right, self.depth+1, self.get_fingerprint(), index, False)
Example #3
Source File: test_bip32.py    From multimerchant-python with MIT License 5 votes vote down vote up 
def test_infinity_point(self):
        w = Wallet.new_random_wallet()
        with patch('multimerchant.wallet.keys.PublicKey.to_point',
                   return_value=INFINITY):
            self.assertRaises(
                InfinityPointException,
                w.get_child,
                1)
Example #4
Source File: test_bip32.py    From bitmerchant with MIT License 5 votes vote down vote up 
def test_infinity_point(self):
        w = Wallet.new_random_wallet()
        with patch('bitmerchant.wallet.keys.PublicKey.to_point',
                   return_value=INFINITY):
            self.assertRaises(
                InfinityPointException,
                w.get_child,
                1)