def from_string(b58_str):
data = utils.encoding.a2b_hashed_base58(b58_str) # TODO checksum?
chain = data[HDPublicKey.ChainCodeStart : HDPublicKey.ChainCodeEnd]
depth = int_from_bytes(data[HDPublicKey.DepthStart : HDPublicKey.DepthEnd])
index = int_from_bytes(data[HDPublicKey.ChildIndexStart : HDPublicKey.ChildIndexEnd])
parent = int_from_bytes(data[HDPublicKey.ParentFingerPrintStart : HDPublicKey.ParentFingerPrintEnd])
# The version field is used to deduce the network:
version = int_from_bytes(data[HDPublicKey.VersionStart:HDPublicKey.VersionEnd])
network = Network.get_by_field('hd_public_key', version)
pubkey = PublicKey.from_bytes(data[HDPublicKey.PublicKeyStart : HDPublicKey.PublicKeyEnd], network)
return HDPublicKey(pubkey, chain, depth, index, parent, network)
def from_string(b58_str):
data = utils.encoding.a2b_hashed_base58(b58_str) # TODO checksum?
chain = data[HDPrivateKey.ChainCodeStart : HDPrivateKey.ChainCodeEnd]
depth = int_from_bytes(data[HDPrivateKey.DepthStart : HDPrivateKey.DepthEnd])
index = int_from_bytes(data[HDPrivateKey.ChildIndexStart : HDPrivateKey.ChildIndexEnd])
parent = int_from_bytes(data[HDPrivateKey.ParentFingerPrintStart : HDPrivateKey.ParentFingerPrintEnd])
# The version field is used to deduce the network:
version = int_from_bytes(data[HDPrivateKey.VersionStart:HDPrivateKey.VersionEnd])
network = networks.find(version, 'hd_private_key')
privkey = PrivateKey.from_bytes(data[HDPrivateKey.PrivateKeyStart : HDPrivateKey.PrivateKeyEnd], network)
return HDPrivateKey(privkey, chain, depth, index, parent, network)
def derive(self, index, hardened = False):
# TODO Is index Valid?
if index < HARDENED_START and hardened:
index += HARDENED_START
if hardened:
raise ValueError("Hardened derivation is not posible on HDPublicKey")
else:
key = self.to_public_key().to_bytes()
signed64 = hmac.new(
self.chain,
key + to_bytes(self.index, length = 4),
hashlib.sha512
).digest()
x, y = self.pubkey.pair
curve = utils.generator_secp256k1
point = int_from_bytes(signed64[:32]) * curve + utils.Point(curve.curve(), x, y, curve.order())
pubkey = PublicKey((point.x(), point.y()), self.network)
chain = signed64[32:]
depth = self.depth + 1
return HDPublicKey(pubkey, chain, depth, index, self.fingerprint, self.network)
def derive(self, index, hardened=False):
# TODO Is index Valid?
if index < HARDENED_START and hardened:
index += HARDENED_START
if hardened:
raise ValueError(
"Hardened derivation is not posible on HDPublicKey")
else:
key = self.to_public_key().to_bytes()
signed64 = hmac.new(self.chain, key + to_bytes(self.index, length=4),
hashlib.sha512).digest()
x, y = self.pubkey.pair
curve = utils.generator_secp256k1
point = int_from_bytes(signed64[:32]) * curve + utils.Point(
curve.curve(), x, y, curve.order())
pubkey = PublicKey((point.x(), point.y()), self.network)
chain = signed64[32:]
depth = self.depth + 1
return HDPublicKey(pubkey, chain, depth, index, self.fingerprint,
self.network)
def from_string(b58_str):
data = utils.encoding.a2b_hashed_base58(b58_str) # TODO checksum?
chain = data[HDPublicKey.ChainCodeStart:HDPublicKey.ChainCodeEnd]
depth = int_from_bytes(
data[HDPublicKey.DepthStart:HDPublicKey.DepthEnd])
index = int_from_bytes(
data[HDPublicKey.ChildIndexStart:HDPublicKey.ChildIndexEnd])
parent = int_from_bytes(
data[HDPublicKey.ParentFingerPrintStart:HDPublicKey.
ParentFingerPrintEnd])
# The version field is used to deduce the network:
version = int_from_bytes(
data[HDPublicKey.VersionStart:HDPublicKey.VersionEnd])
network = Network.get_by_field('hd_public_key', version)
pubkey = PublicKey.from_bytes(
data[HDPublicKey.PublicKeyStart:HDPublicKey.PublicKeyEnd], network)
return HDPublicKey(pubkey, chain, depth, index, parent, network)
def __new__(cls,
privkey,
chain,
depth=0,
index=0,
parent=ROOT_FINGERPRINT,
network=network.default):
assert isinstance(privkey, PrivateKey)
fingerprint = int_from_bytes(calculate_fingerprint(privkey))
return super(HDPrivateKey,
cls).__new__(cls, privkey, chain, depth, index, parent,
network, fingerprint)
def derive(self, index, hardened=False):
# TODO Is index Valid?
if index < HARDENED_START and hardened:
index += HARDENED_START
if hardened:
key = '\0' + self.to_private_key().to_bytes(
) # a literal 0 is prepended to private keys
else:
key = self.to_public_key().to_bytes()
signed64 = hmac.new(self.chain, key + to_bytes(self.index, length=4),
hashlib.sha512).digest()
seed = (int_from_bytes(signed64[:32]) + self.to_private_key().seed
) % utils.generator_secp256k1.order()
privkey = PrivateKey(seed, self.network)
chain = signed64[32:]
depth = self.depth + 1
return HDPrivateKey(privkey, chain, depth, index, self.fingerprint,
self.network)
def derive(self, index, hardened = False):
# TODO Is index Valid?
if index < HARDENED_START and hardened:
index += HARDENED_START
if hardened:
key = '\0' + self.to_private_key().to_bytes() # a literal 0 is prepended to private keys
else:
key = self.to_public_key().to_bytes()
signed64 = hmac.new(
self.chain,
key + to_bytes(self.index, length = 4),
hashlib.sha512
).digest()
seed = (int_from_bytes(signed64[:32]) + self.to_private_key().seed) % utils.generator_secp256k1.order()
privkey = PrivateKey(seed, self.network)
chain = signed64[32:]
depth = self.depth + 1
return HDPrivateKey(privkey, chain, depth, index, self.fingerprint, self.network)
def __new__(cls, pubkey, chain, depth = 0, index = 0, parent = ROOT_FINGERPRINT, network = network.default):
assert isinstance(pubkey, PublicKey)
fingerprint = int_from_bytes(calculate_fingerprint(pubkey))
return super(HDPublicKey, cls).__new__(cls, pubkey, chain, depth, index, parent, network, fingerprint)
