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get_per_commitment_secret_from_seed: small clean-up

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SomberNight
2018-04-19 20:09:44 +02:00
committed by ThomasV
parent b523085fa3
commit 3e899caaf4
2 changed files with 16 additions and 19 deletions
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14
lib/lnbase.py
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@@ -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):