def fromSeed(seed = None):
if seed is None:
seed = os.urandom(MIN_SEED_LEN)
if len(seed) < MIN_SEED_LEN:
raise ValueError("HDPrivateKey seed must be at least 32 bytes long")
signed64 = hmac.new(HMAC_MAGIC_KEY, seed, hashlib.sha512).digest()
return HDPrivateKey(privkey = PrivateKey.from_bytes(signed64[:32]), chain = signed64[32:])
def fromSeed(seed=None):
if seed is None:
seed = os.urandom(MIN_SEED_LEN)
if len(seed) < MIN_SEED_LEN:
raise ValueError(
"HDPrivateKey seed must be at least 32 bytes long")
signed64 = hmac.new(HMAC_MAGIC_KEY, seed, hashlib.sha512).digest()
return HDPrivateKey(privkey=PrivateKey.from_bytes(signed64[:32]),
chain=signed64[32:])
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 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 = Network.get_by_field('hd_private_key', version)
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:
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)
