def serialize_xprv(xtype,
c,
k,
depth=0,
fingerprint=b'\x00' * 4,
child_number=b'\x00' * 4,
*,
net=None):
if not ecc.is_secret_within_curve_range(k):
raise BitcoinException('Impossible xprv (not within curve order)')
xprv = xprv_header(xtype, net=net) \
+ bytes([depth]) + fingerprint + child_number + c + bytes([0]) + k
return EncodeBase58Check(xprv)
def deserialize_xkey(xkey, prv, *, net=None):
if net is None:
net = constants.net
xkey = DecodeBase58Check(xkey)
if len(xkey) != 78:
raise BitcoinException('Invalid length for extended key: {}'.format(
len(xkey)))
depth = xkey[4]
fingerprint = xkey[5:9]
child_number = xkey[9:13]
c = xkey[13:13 + 32]
header = int('0x' + bh2u(xkey[0:4]), 16)
headers = net.XPRV_HEADERS if prv else net.XPUB_HEADERS
if header not in headers.values():
raise BitcoinException('Invalid extended key format: {}'.format(
hex(header)))
xtype = list(headers.keys())[list(headers.values()).index(header)]
n = 33 if prv else 32
K_or_k = xkey[13 + n:]
if prv and not ecc.is_secret_within_curve_range(K_or_k):
raise BitcoinException('Impossible xprv (not within curve order)')
return xtype, depth, fingerprint, child_number, c, K_or_k
def deserialize_drk(xkey, prv, *, net=None):
if net is None:
net = constants.net
xkey = DecodeBase58Check(xkey)
if len(xkey) != 78:
raise BitcoinException('Invalid length for extended key: {}'.format(
len(xkey)))
depth = xkey[4]
fingerprint = xkey[5:9]
child_number = xkey[9:13]
c = xkey[13:13 + 32]
header = int('0x' + bh2u(xkey[0:4]), 16)
if prv and header != net.DRKV_HEADER:
raise BitcoinException('Invalid extended key format: {}'.format(
hex(header)))
if not prv and header != net.DRKP_HEADER:
raise BitcoinException('Invalid extended key format: {}'.format(
hex(header)))
xtype = 'standard'
n = 33 if prv else 32
K_or_k = xkey[13 + n:]
if prv and not ecc.is_secret_within_curve_range(K_or_k):
raise BitcoinException('Impossible drkv (not within curve order)')
return xtype, depth, fingerprint, child_number, c, K_or_k