tlnbase: add privkey derivation - electrum - Electrum Bitcoin wallet (HTM) git clone https://git.parazyd.org/electrum (DIR) Log (DIR) Files (DIR) Refs (DIR) Submodules --- (DIR) commit 6c4c2267f8b56570c067359e1e0f9aa2f6a6478e (DIR) parent 6d703db971769ed6410c25c4f998051c4e8a3128 (HTM) Author: ThomasV <thomasv@electrum.org> Date: Tue, 17 Apr 2018 11:37:47 +0200 lnbase: add privkey derivation Diffstat: M lib/lnbase.py | 10 ++++++---- M lib/tests/test_lnbase.py | 6 ++++-- 2 files changed, 10 insertions(+), 6 deletions(-) --- (DIR) diff --git a/lib/lnbase.py b/lib/lnbase.py t@@ -266,6 +266,10 @@ def derive_pubkey(basepoint, per_commitment_point): p2 = SECP256k1.generator * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint)) return point_to_ser(p + p2) +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 overall_weight(num_htlc): return 500 + 172 * num_htlc + 224 t@@ -652,16 +656,13 @@ class Peer(PrintError): funding_pubkey, funding_privkey = next(keys) revocation_basepoint, revocation_privkey = next(keys) htlc_basepoint, htlc_privkey = next(keys) - payment_basepoint, payment_privkey = next(keys) delayed_payment_basepoint, delayed_privkey = next(keys) funding_satoshis = 20000 base_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f per_commitment_secret = 0x1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100 base_point = secret_to_pubkey(base_secret) - print('base_point', binascii.hexlify(base_point)) per_commitment_point = secret_to_pubkey(per_commitment_secret) - print('per_commitment_point', binascii.hexlify(per_commitment_point)) msg = gen_msg( "open_channel", t@@ -690,7 +691,8 @@ class Peer(PrintError): funding_tx = wallet.mktx([funding_output], None, config, 1000) funding_index = funding_tx.outputs().index(funding_output) remote_payment_basepoint = payload['payment_basepoint'] - localpubkey = derive_pubkey(payment_basepoint, per_commitment_point) + 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) self.print_error('revocation_pubkey', binascii.hexlify(revocation_pubkey)) (DIR) diff --git a/lib/tests/test_lnbase.py b/lib/tests/test_lnbase.py t@@ -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 +from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey from lib.transaction import Transaction from lib import bitcoin import ecdsa.ellipticcurve t@@ -172,7 +172,7 @@ class Test_LNBase(unittest.TestCase): print(p.find_route_for_payment('a', 'e', 100000)) def test_key_derivation(self): - print('test key derivation') + # BOLT3, Appendix E base_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f per_commitment_secret = 0x1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100 base_point = secret_to_pubkey(base_secret) t@@ -180,3 +180,5 @@ class Test_LNBase(unittest.TestCase): per_commitment_point = secret_to_pubkey(per_commitment_secret) 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)