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get_per_commitment_secret_from_seed (not working yet)

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SomberNight 2018-04-19 19:08:35 +02:00
parent 729dde2bb4
commit b15a74c95a
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2 changed files with 44 additions and 1 deletions
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29
lib/lnbase.py
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@ -316,6 +316,35 @@ def derive_blinded_pubkey(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 get_per_commitment_secret_from_seed(seed: int, i: int) -> int:
"""Generate per commitment secret."""
#seed ^= 1
#pcs_bytes = seed.to_bytes(byteorder="big", length=32)
#print(bh2u(pcs_bytes))
#return int.from_bytes(hashlib.sha256(pcs_bytes[::-1]).digest(), byteorder="big")
#tmp = seed.to_bytes(byteorder="big", length=32)
#seed = int.from_bytes(tmp[::-1], byteorder="big")
per_commitment_secret = seed
print('get_per_commitment_secret_from_seed() per_commitment_secret', per_commitment_secret)
print('get_per_commitment_secret_from_seed() i', i)
for bitindex in range(47, -1, -1): # 47, 46, ..., 0
mask = 1 << bitindex
if i & mask:
print('get_per_commitment_secret_from_seed() bitindex, mask', bitindex, mask)
print('get_per_commitment_secret_from_seed() branch entered')
per_commitment_secret ^= mask
print('get_per_commitment_secret_from_seed() per_commitment_secret br1', per_commitment_secret)
pcs_bytes = per_commitment_secret.to_bytes(byteorder="big", length=32)
per_commitment_secret = int.from_bytes(bitcoin.sha256(pcs_bytes[::-1]), byteorder="big")
print('get_per_commitment_secret_from_seed() per_commitment_secret br2', per_commitment_secret)
return per_commitment_secret
def overall_weight(num_htlc):
return 500 + 172 * num_htlc + 224

16
lib/tests/test_lnbase.py
View file

@ -5,7 +5,7 @@ import unittest
from lib.util import bh2u, bfh
from lib.lnbase import make_commitment, get_obscured_ctn, Peer, make_offered_htlc, make_received_htlc, make_htlc_tx
from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey, derive_blinded_pubkey, overall_weight
from lib.lnbase import make_htlc_tx_output, make_htlc_tx_inputs
from lib.lnbase import make_htlc_tx_output, make_htlc_tx_inputs, get_per_commitment_secret_from_seed
from lib.transaction import Transaction
from lib import bitcoin
import ecdsa.ellipticcurve
@ -231,3 +231,17 @@ class Test_LNBase(unittest.TestCase):
self.assertEqual(revocation_basepoint, bfh('036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2'))
revocationpubkey = derive_blinded_pubkey(revocation_basepoint, per_commitment_point)
self.assertEqual(revocationpubkey, bfh('02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0'))
def test_per_commitment_secret_from_seed(self):
self.assertEqual(bh2u(0x915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c.to_bytes(byteorder="big", length=32)),
bh2u(get_per_commitment_secret_from_seed(0x0101010101010101010101010101010101010101010101010101010101010101, 1).to_bytes(byteorder="big", length=32)))
self.assertEqual(bh2u(0x02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148.to_bytes(byteorder="big", length=32)),
bh2u(get_per_commitment_secret_from_seed(0x0000000000000000000000000000000000000000000000000000000000000000, 281474976710655).to_bytes(byteorder="big", length=32)))
#self.assertEqual(0x7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc,
# get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 281474976710655))
#self.assertEqual(0x56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528,
# get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 0xaaaaaaaaaaa))
#self.assertEqual(0x9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31,
# get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 0x555555555555))