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lnbase: add privkey derivation

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This commit is contained in:
ThomasV 2018-04-17 11:37:47 +02:00 committed by Janus
parent 5d2be9edab
commit 7471c60f2f
2 changed files with 10 additions and 6 deletions
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10
lib/lnbase.py
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@ -266,6 +266,10 @@ def derive_pubkey(basepoint, per_commitment_point):
p2 = SECP256k1.generator * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
return point_to_ser(p + p2)
def derive_privkey(secret, per_commitment_point):
basepoint = point_to_ser(SECP256k1.generator * secret)
return secret + bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
def overall_weight(num_htlc):
return 500 + 172 * num_htlc + 224
@ -652,16 +656,13 @@ class Peer(PrintError):
funding_pubkey, funding_privkey = next(keys)
revocation_basepoint, revocation_privkey = next(keys)
htlc_basepoint, htlc_privkey = next(keys)
payment_basepoint, payment_privkey = next(keys)
delayed_payment_basepoint, delayed_privkey = next(keys)
funding_satoshis = 20000
base_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
per_commitment_secret = 0x1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100
base_point = secret_to_pubkey(base_secret)
print('base_point', binascii.hexlify(base_point))
per_commitment_point = secret_to_pubkey(per_commitment_secret)
print('per_commitment_point', binascii.hexlify(per_commitment_point))
msg = gen_msg(
"open_channel",
@ -690,7 +691,8 @@ class Peer(PrintError):
funding_tx = wallet.mktx([funding_output], None, config, 1000)
funding_index = funding_tx.outputs().index(funding_output)
remote_payment_basepoint = payload['payment_basepoint']
localpubkey = derive_pubkey(payment_basepoint, per_commitment_point)
localpubkey = derive_pubkey(base_point, per_commitment_point)
localprivkey = derive_privkey(base_secret, per_commitment_point)
self.print_error('localpubkey', binascii.hexlify(localpubkey))
revocation_pubkey = derive_pubkey(revocation_basepoint, per_commitment_point)
self.print_error('revocation_pubkey', binascii.hexlify(revocation_pubkey))

6
lib/tests/test_lnbase.py
View File

@ -4,7 +4,7 @@ import unittest
from lib.util import bh2u, bfh
from lib.lnbase import make_commitment, get_obscured_ctn, Peer, make_offered_htlc, make_received_htlc
from lib.lnbase import secret_to_pubkey, derive_pubkey
from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey
from lib.transaction import Transaction
from lib import bitcoin
import ecdsa.ellipticcurve
@ -172,7 +172,7 @@ class Test_LNBase(unittest.TestCase):
print(p.find_route_for_payment('a', 'e', 100000))
def test_key_derivation(self):
print('test key derivation')
# BOLT3, Appendix E
base_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
per_commitment_secret = 0x1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100
base_point = secret_to_pubkey(base_secret)
@ -180,3 +180,5 @@ class Test_LNBase(unittest.TestCase):
per_commitment_point = secret_to_pubkey(per_commitment_secret)
localpubkey = derive_pubkey(base_point, per_commitment_point)
self.assertEqual(localpubkey, bfh('0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5'))
localprivkey = derive_privkey(base_secret, per_commitment_point)
self.assertEqual(localprivkey, 0xcbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f)