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lnbase: derive blinded pubkey

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This commit is contained in:
ThomasV 2018-04-17 12:31:22 +02:00
parent d4377cc073
commit 8f00bdb0b0
2 changed files with 15 additions and 5 deletions
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12
lib/lnbase.py
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@ -262,14 +262,18 @@ def secret_to_pubkey(secret):
return point_to_ser(SECP256k1.generator * secret)
def derive_pubkey(basepoint, per_commitment_point):
p = ser_to_point(basepoint)
p2 = SECP256k1.generator * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
return point_to_ser(p + p2)
p = ser_to_point(basepoint) + SECP256k1.generator * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
return point_to_ser(p)
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 derive_blinded_pubkey(basepoint, per_commitment_point):
k1 = ser_to_point(basepoint) * bitcoin.string_to_number(bitcoin.sha256(basepoint + per_commitment_point))
k2 = ser_to_point(per_commitment_point) * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
return point_to_ser(k1 + k2)
def overall_weight(num_htlc):
return 500 + 172 * num_htlc + 224
@ -691,7 +695,7 @@ class Peer(PrintError):
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)
revocation_pubkey = derive_blinded_pubkey(revocation_basepoint, remote_per_commitment_point)
self.print_error('revocation_pubkey', binascii.hexlify(revocation_pubkey))
local_delayedpubkey = derive_pubkey(delayed_payment_basepoint, per_commitment_point)
self.print_error('local_delayedpubkey', binascii.hexlify(local_delayedpubkey))

8
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, derive_privkey
from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey, derive_blinded_pubkey
from lib.transaction import Transaction
from lib import bitcoin
import ecdsa.ellipticcurve
@ -178,7 +178,13 @@ class Test_LNBase(unittest.TestCase):
base_point = secret_to_pubkey(base_secret)
self.assertEqual(base_point, bfh('036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2'))
per_commitment_point = secret_to_pubkey(per_commitment_secret)
self.assertEqual(per_commitment_point, bfh('025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486'))
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)
revocation_basepoint_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
revocation_basepoint = secret_to_pubkey(revocation_basepoint_secret)
self.assertEqual(revocation_basepoint, bfh('036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2'))
revocationpubkey = derive_blinded_pubkey(revocation_basepoint, per_commitment_point)
self.assertEqual(revocationpubkey, bfh('02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0'))