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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))