AaronFiore/electrum
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Generate channel keys from random seed

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This commit is contained in:
ThomasV
2020-02-21 12:18:28 +01:00
parent c2432aa125
commit 55e0e1a72e
3 changed files with 13 additions and 7 deletions
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7
electrum/lnpeer.py
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@@ -20,6 +20,7 @@ import aiorpcx
from .crypto import sha256, sha256d
from . import bitcoin
from .bip32 import BIP32Node
from . import ecc
from .ecc import sig_string_from_r_and_s, get_r_and_s_from_sig_string, der_sig_from_sig_string
from . import constants
@@ -455,8 +456,10 @@ class Peer(Logger):
def make_local_config(self, funding_sat: int, push_msat: int, initiator: HTLCOwner) -> LocalConfig:
# key derivation
channel_counter = self.lnworker.get_and_inc_counter_for_channel_keys()
keypair_generator = lambda family: generate_keypair(self.lnworker.ln_keystore, family, channel_counter)
seed = os.urandom(32)
node = BIP32Node.from_rootseed(seed, xtype='standard')
keypair_generator = lambda family: generate_keypair(node, family)
if initiator == LOCAL:
initial_msat = funding_sat * 1000 - push_msat
else:

10
electrum/lnutil.py
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@@ -22,7 +22,7 @@ from .bitcoin import push_script, redeem_script_to_address, address_to_script
from . import segwit_addr
from .i18n import _
from .lnaddr import lndecode
from .keystore import BIP32_KeyStore
from .bip32 import BIP32Node
if TYPE_CHECKING:
from .lnchannel import Channel
@@ -791,8 +791,12 @@ class LnKeyFamily(IntEnum):
NODE_KEY = 6
def generate_keypair(ln_keystore: BIP32_KeyStore, key_family: LnKeyFamily, index: int) -> Keypair:
return Keypair(*ln_keystore.get_keypair([key_family, 0, index], None))
def generate_keypair(node: BIP32Node, key_family: LnKeyFamily) -> Keypair:
node2 = node.subkey_at_private_derivation([key_family])
k = node2.eckey.get_secret_bytes()
cK = ecc.ECPrivkey(k).get_public_key_bytes()
return Keypair(cK, k)
NUM_MAX_HOPS_IN_PAYMENT_PATH = 20

3
electrum/lnworker.py
View File

@@ -124,7 +124,7 @@ class LNWorker(Logger):
def __init__(self, xprv):
Logger.__init__(self)
self.node_keypair = generate_keypair(keystore.from_xprv(xprv), LnKeyFamily.NODE_KEY, 0)
self.node_keypair = generate_keypair(BIP32Node.from_xkey(xprv), LnKeyFamily.NODE_KEY)
self.peers = {} # type: Dict[bytes, Peer] # pubkey -> Peer
# set some feature flags as baseline for both LNWallet and LNGossip
# note that e.g. DATA_LOSS_PROTECT is needed for LNGossip as many peers require it
@@ -358,7 +358,6 @@ class LNWallet(LNWorker):
self.db = wallet.db
self.config = wallet.config
LNWorker.__init__(self, xprv)
self.ln_keystore = keystore.from_xprv(xprv)
self.localfeatures |= LnLocalFeatures.OPTION_DATA_LOSS_PROTECT_REQ
self.payments = self.db.get_dict('lightning_payments') # RHASH -> amount, direction, is_paid
self.preimages = self.db.get_dict('lightning_preimages') # RHASH -> preimage