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get_per_commitment_secret_from_seed: small clean-up

dependabot/pip/contrib/deterministic-build/ecdsa-0.13.3
SomberNight 7 years ago
committed by ThomasV
parent
commit
3e899caaf4
  1. 14
      lib/lnbase.py
  2. 21
      lib/tests/test_lnbase.py

14
lib/lnbase.py

@ -317,17 +317,15 @@ def derive_blinded_pubkey(basepoint, per_commitment_point):
return point_to_ser(k1 + k2)
def get_per_commitment_secret_from_seed(seed: int, bits: int, i: int) -> int:
def get_per_commitment_secret_from_seed(seed: bytes, i: int, bits: int = 47) -> bytes:
"""Generate per commitment secret."""
per_commitment_secret = seed
for bitindex in range(bits, -1, -1): # 47, 46, ..., 0
per_commitment_secret = bytearray(seed)
for bitindex in range(bits, -1, -1):
mask = 1 << bitindex
if i & mask:
pcs_bytes = bytearray(per_commitment_secret.to_bytes(byteorder="big", length=32))
pcs_bytes[bitindex // 8] ^= 1 << (bitindex % 8)
per_commitment_secret = int.from_bytes(bitcoin.sha256(pcs_bytes), byteorder="big")
return per_commitment_secret
per_commitment_secret[bitindex // 8] ^= 1 << (bitindex % 8)
per_commitment_secret = bytearray(bitcoin.sha256(per_commitment_secret))
return bytes(per_commitment_secret)
def overall_weight(num_htlc):

21
lib/tests/test_lnbase.py

@ -233,15 +233,14 @@ class Test_LNBase(unittest.TestCase):
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, 47, 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, 47, 281474976710655).to_bytes(byteorder="big", length=32)))
self.assertEqual(0x7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc,
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 47, 281474976710655))
self.assertEqual(0x56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528,
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 47, 0xaaaaaaaaaaa))
self.assertEqual(0x9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31,
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF, 47, 0x555555555555))
self.assertEqual(0x02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148.to_bytes(byteorder="big", length=32),
get_per_commitment_secret_from_seed(0x0000000000000000000000000000000000000000000000000000000000000000.to_bytes(byteorder="big", length=32), 281474976710655))
self.assertEqual(0x7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc.to_bytes(byteorder="big", length=32),
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF.to_bytes(byteorder="big", length=32), 281474976710655))
self.assertEqual(0x56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528.to_bytes(byteorder="big", length=32),
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF.to_bytes(byteorder="big", length=32), 0xaaaaaaaaaaa))
self.assertEqual(0x9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31.to_bytes(byteorder="big", length=32),
get_per_commitment_secret_from_seed(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF.to_bytes(byteorder="big", length=32), 0x555555555555))
self.assertEqual(0x915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c.to_bytes(byteorder="big", length=32),
get_per_commitment_secret_from_seed(0x0101010101010101010101010101010101010101010101010101010101010101.to_bytes(byteorder="big", length=32), 1))

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