def _make_node_path(self, xpub, address_n):
_, depth, fingerprint, child_num, chain_code, key = deserialize_xpub(xpub)
node = self.types.HDNodeType(
depth=depth,
fingerprint=int.from_bytes(fingerprint, 'big'),
child_num=int.from_bytes(child_num, 'big'),
chain_code=chain_code,
public_key=key,
)
return self.types.HDNodePathType(node=node, address_n=address_n)
def mitm_verify(self, sig, expect_xpub):
# verify a signature (65 bytes) over the session key, using the master bip32 node
# - customized to use specific EC library of Electrum.
from electrum_nmc.ecc import ECPubkey
xtype, depth, parent_fingerprint, child_number, chain_code, K_or_k \
= bitcoin.deserialize_xpub(expect_xpub)
pubkey = ECPubkey(K_or_k)
try:
pubkey.verify_message_hash(sig[1:65], self.session_key)
return True
except:
return False
def get_xpub(self, bip32_path, xtype):
assert xtype in ColdcardPlugin.SUPPORTED_XTYPES
print_error('[coldcard]', 'Derive xtype = %r' % xtype)
xpub = self.dev.send_recv(CCProtocolPacker.get_xpub(bip32_path), timeout=5000)
# TODO handle timeout?
# change type of xpub to the requested type
try:
__, depth, fingerprint, child_number, c, cK = deserialize_xpub(xpub)
except InvalidMasterKeyVersionBytes:
raise Exception(_('Invalid xpub magic. Make sure your {} device is set to the correct chain.')
.format(self.device)) from None
if xtype != 'standard':
xpub = serialize_xpub(xtype, c, cK, depth, fingerprint, child_number)
return xpub
def get_xpub(self, bip32_path, xtype):
assert xtype in self.plugin.SUPPORTED_XTYPES
reply = self._get_xpub(bip32_path)
if reply:
xpub = reply['xpub']
# Change type of xpub to the requested type. The firmware
# only ever returns the mainnet standard type, but it is agnostic
# to the type when signing.
if xtype != 'standard' or constants.net.TESTNET:
_, depth, fingerprint, child_number, c, cK = deserialize_xpub(xpub, net=constants.BitcoinMainnet)
xpub = serialize_xpub(xtype, c, cK, depth, fingerprint, child_number)
return xpub
else:
raise Exception('no reply')