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https://github.com/LBRYFoundation/LBRY-Vault.git
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lnbase: key derivation (WIP)
This commit is contained in:
ThomasV
parent
4b8f279d50
commit
aa8700d0b3
1 changed files with 47 additions and 20 deletions
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@ -258,6 +258,14 @@ def get_obscured_ctn(ctn, local, remote):
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mask = int.from_bytes(H256(local + remote)[-6:], byteorder="big")
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return ctn ^ mask
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def secret_to_pubkey(secret):
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return point_to_ser(SECP256k1.generator * secret)
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def derive_pubkey(basepoint, per_commitment_point):
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p = ser_to_point(basepoint)
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p2 = SECP256k1.generator * bitcoin.string_to_number(bitcoin.sha256(per_commitment_point + basepoint))
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return point_to_ser(p + p2)
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def overall_weight(num_htlc):
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return 500 + 172 * num_htlc + 224
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@ -300,11 +308,11 @@ def make_received_htlc(revocation_pubkey, remote_htlcpubkey, local_htlcpubkey, p
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def make_commitment(ctn, local_funding_pubkey, remote_funding_pubkey, remotepubkey,
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payment_pubkey, remote_payment_pubkey, revocation_pubkey, delayed_pubkey,
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payment_basepoint, remote_payment_basepoint, revocation_pubkey, delayed_pubkey,
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funding_txid, funding_pos, funding_satoshis,
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to_local_msat, to_remote_msat, local_feerate, local_delay, htlcs=[]):
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pubkeys = sorted([bh2u(local_funding_pubkey), bh2u(remote_funding_pubkey)])
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obs = get_obscured_ctn(ctn, payment_pubkey, remote_payment_pubkey)
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obs = get_obscured_ctn(ctn, payment_basepoint, remote_payment_basepoint)
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locktime = (0x20 << 24) + (obs & 0xffffff)
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sequence = (0x80 << 24) + (obs >> 24)
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print_error('locktime', locktime, hex(locktime))
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@ -324,13 +332,12 @@ def make_commitment(ctn, local_funding_pubkey, remote_funding_pubkey, remotepubk
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local_script = bytes([opcodes.OP_IF]) + bfh(push_script(bh2u(revocation_pubkey))) + bytes([opcodes.OP_ELSE]) + add_number_to_script(local_delay) \
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+ bytes([opcodes.OP_CSV, opcodes.OP_DROP]) + bfh(push_script(bh2u(delayed_pubkey))) + bytes([opcodes.OP_ENDIF, opcodes.OP_CHECKSIG])
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local_address = bitcoin.redeem_script_to_address('p2wsh', bh2u(local_script))
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fee = local_feerate * overall_weight(0) // 1000
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fee = local_feerate * overall_weight(len(htlcs)) // 1000
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local_amount = to_local_msat // 1000 - fee
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remote_address = bitcoin.pubkey_to_address('p2wpkh', bh2u(remotepubkey))
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remote_amount = to_remote_msat // 1000
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to_local = (bitcoin.TYPE_ADDRESS, local_address, local_amount)
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to_remote = (bitcoin.TYPE_ADDRESS, remote_address, remote_amount)
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# no htlc for the moment
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c_outputs = [to_local, to_remote]
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for script, msat_amount in htlcs:
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c_outputs += [(bitcoin.TYPE_ADDRESS, bitcoin.redeem_script_to_address('p2wsh', bh2u(script)), msat_amount // 1000)]
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@ -639,14 +646,23 @@ class Peer(PrintError):
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@aiosafe
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async def channel_establishment_flow(self, wallet, config):
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await self.initialized
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keys = get_unused_keys()
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temp_channel_id = os.urandom(32)
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keys = get_unused_keys()
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funding_pubkey, funding_privkey = next(keys)
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revocation_pubkey, revocation_privkey = next(keys)
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htlc_pubkey, htlc_privkey = next(keys)
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payment_pubkey, payment_privkey = next(keys)
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delayed_pubkey, delayed_privkey = next(keys)
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revocation_basepoint, revocation_privkey = next(keys)
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htlc_basepoint, htlc_privkey = next(keys)
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payment_basepoint, payment_privkey = next(keys)
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delayed_payment_basepoint, delayed_privkey = next(keys)
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funding_satoshis = 20000
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base_secret = 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
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per_commitment_secret = 0x1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100
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base_point = secret_to_pubkey(base_secret)
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print('base_point', binascii.hexlify(base_point))
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per_commitment_point = secret_to_pubkey(per_commitment_secret)
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print('per_commitment_point', binascii.hexlify(per_commitment_point))
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msg = gen_msg(
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"open_channel",
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temporary_channel_id=temp_channel_id,
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@ -654,30 +670,41 @@ class Peer(PrintError):
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funding_satoshis=funding_satoshis,
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max_accepted_htlcs=5,
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funding_pubkey=funding_pubkey,
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revocation_basepoint=revocation_pubkey,
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htlc_basepoint=htlc_pubkey,
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payment_basepoint=payment_pubkey,
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delayed_payment_basepoint=delayed_pubkey,
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first_per_commitment_point=next(keys)[0]
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revocation_basepoint=revocation_basepoint,
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htlc_basepoint=htlc_basepoint,
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payment_basepoint=payment_basepoint,
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delayed_payment_basepoint=delayed_payment_basepoint,
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first_per_commitment_point=per_commitment_point
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)
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self.channel_accepted[temp_channel_id] = asyncio.Future()
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self.send_message(msg)
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try:
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accept_channel = await self.channel_accepted[temp_channel_id]
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payload = await self.channel_accepted[temp_channel_id]
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finally:
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del self.channel_accepted[temp_channel_id]
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remote_funding_pubkey = accept_channel["funding_pubkey"]
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pubkeys = sorted([bh2u(funding_pubkey), bh2u(remote_pubkey)])
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remote_funding_pubkey = payload["funding_pubkey"]
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pubkeys = sorted([bh2u(funding_pubkey), bh2u(remote_funding_pubkey)])
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redeem_script = transaction.multisig_script(pubkeys, 2)
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funding_address = bitcoin.redeem_script_to_address('p2wsh', redeem_script)
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funding_output = (bitcoin.TYPE_ADDRESS, funding_address, funding_satoshis)
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funding_tx = wallet.mktx([funding_output], None, config, 1000)
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funding_index = funding_tx.outputs().index(funding_output)
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remote_payment_pubkey = accept_channel['payment_basepoint']
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remote_payment_basepoint = payload['payment_basepoint']
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localpubkey = derive_pubkey(payment_basepoint, per_commitment_point)
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self.print_error('localpubkey', binascii.hexlify(localpubkey))
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revocation_pubkey = derive_pubkey(revocation_basepoint, per_commitment_point)
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self.print_error('revocation_pubkey', binascii.hexlify(revocation_pubkey))
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local_delayedpubkey = derive_pubkey(delayed_payment_basepoint, per_commitment_point)
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self.print_error('local_delayedpubkey', binascii.hexlify(local_delayedpubkey))
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remotepubkey = derive_pubkey(remote_payment_basepoint, per_commitment_point)
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self.print_error('remotepubkey', binascii.hexlify(remotepubkey))
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ctn = 0
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c_tx = make_commitment(
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0,
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ctn,
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funding_pubkey, remote_funding_pubkey,
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payment_pubkey, remote_payment_pubkey, revocation_pubkey, delayed_pubkey,
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remotepubkey,
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payment_basepoint, remote_payment_basepoint,
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revocation_pubkey, local_delayedpubkey,
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funding_tx.txid(), funding_index, funding_satoshis,
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funding_satoshis*1000, 0, 20000, 144)
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c_tx.sign({bh2u(funding_pubkey): (funding_privkey, True)})
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