def on_auth_received(self, nick, offer, commitment, cr, amount, kphex):
"""Receives data on proposed transaction offer from daemon, verifies
commitment, returns necessary data to send ioauth message (utxos etc)
"""
#deserialize the commitment revelation
cr_dict = PoDLE.deserialize_revelation(cr)
#check the validity of the proof of discrete log equivalence
tries = jm_single().config.getint("POLICY", "taker_utxo_retries")
def reject(msg):
jlog.info("Counterparty commitment not accepted, reason: " + msg)
return (False, )
if not verify_podle(str(cr_dict['P']),
str(cr_dict['P2']),
str(cr_dict['sig']),
str(cr_dict['e']),
str(commitment),
index_range=range(tries)):
reason = "verify_podle failed"
return reject(reason)
#finally, check that the proffered utxo is real, old enough, large enough,
#and corresponds to the pubkey
res = jm_single().bc_interface.query_utxo_set([cr_dict['utxo']],
includeconf=True)
if len(res) != 1 or not res[0]:
reason = "authorizing utxo is not valid"
return reject(reason)
age = jm_single().config.getint("POLICY", "taker_utxo_age")
if res[0]['confirms'] < age:
reason = "commitment utxo not old enough: " + str(
res[0]['confirms'])
return reject(reason)
reqd_amt = int(
amount *
jm_single().config.getint("POLICY", "taker_utxo_amtpercent") /
100.0)
if res[0]['value'] < reqd_amt:
reason = "commitment utxo too small: " + str(res[0]['value'])
return reject(reason)
if res[0]['address'] != self.wallet.pubkey_to_address(cr_dict['P']):
reason = "Invalid podle pubkey: " + str(cr_dict['P'])
return reject(reason)
# authorisation of taker passed
#Find utxos for the transaction now:
utxos, cj_addr, change_addr = self.oid_to_order(offer, amount)
if not utxos:
#could not find funds
return (False, )
self.wallet.update_cache_index()
# Construct data for auth request back to taker.
# Need to choose an input utxo pubkey to sign with
# (no longer using the coinjoin pubkey from 0.2.0)
# Just choose the first utxo in self.utxos and retrieve key from wallet.
auth_address = utxos[utxos.keys()[0]]['address']
auth_key = self.wallet.get_key_from_addr(auth_address)
auth_pub = btc.privtopub(auth_key)
btc_sig = btc.ecdsa_sign(kphex, auth_key)
return (True, utxos, auth_pub, cj_addr, change_addr, btc_sig)
def test_rand_commitments(setup_podle):
for i in range(20):
priv = os.urandom(32)+b"\x01"
Pser, P2ser, s, e, commitment = generate_single_podle_sig(priv, 1 + i%5)
assert verify_podle(Pser, P2ser, s, e, commitment)
#tweak commitments to verify failure
tweaked = [x[::-1] for x in [Pser, P2ser, s, e, commitment]]
for i in range(5):
#Check failure on garbling of each parameter
y = [Pser, P2ser, s, e, commitment]
y[i] = tweaked[i]
fail = False
try:
fail = verify_podle(*y)
except:
pass
finally:
assert not fail
def on_auth_received(self, nick, offer, commitment, cr, amount, kphex):
"""Receives data on proposed transaction offer from daemon, verifies
commitment, returns necessary data to send ioauth message (utxos etc)
"""
# special case due to cjfee passed as string: it can accidentally parse
# as hex:
if not isinstance(offer["cjfee"], str):
offer["cjfee"] = bintohex(offer["cjfee"])
#check the validity of the proof of discrete log equivalence
tries = jm_single().config.getint("POLICY", "taker_utxo_retries")
def reject(msg):
jlog.info("Counterparty commitment not accepted, reason: " + msg)
return (False, )
# deserialize the commitment revelation
try:
cr_dict = PoDLE.deserialize_revelation(cr)
except PoDLEError as e:
reason = repr(e)
return reject(reason)
if not verify_podle(cr_dict['P'],
cr_dict['P2'],
cr_dict['sig'],
cr_dict['e'],
commitment,
index_range=range(tries)):
reason = "verify_podle failed"
return reject(reason)
#finally, check that the proffered utxo is real, old enough, large enough,
#and corresponds to the pubkey
res = jm_single().bc_interface.query_utxo_set([cr_dict['utxo']],
includeconf=True)
if len(res) != 1 or not res[0]:
reason = "authorizing utxo is not valid"
return reject(reason)
age = jm_single().config.getint("POLICY", "taker_utxo_age")
if res[0]['confirms'] < age:
reason = "commitment utxo not old enough: " + str(
res[0]['confirms'])
return reject(reason)
reqd_amt = int(
amount *
jm_single().config.getint("POLICY", "taker_utxo_amtpercent") /
100.0)
if res[0]['value'] < reqd_amt:
reason = "commitment utxo too small: " + str(res[0]['value'])
return reject(reason)
try:
if not self.wallet_service.pubkey_has_script(
cr_dict['P'], res[0]['script']):
raise EngineError()
except EngineError:
reason = "Invalid podle pubkey: " + str(cr_dict['P'])
return reject(reason)
# authorisation of taker passed
# Find utxos for the transaction now:
utxos, cj_addr, change_addr = self.oid_to_order(offer, amount)
if not utxos:
#could not find funds
return (False, )
# for index update persistence:
self.wallet_service.save_wallet()
# Construct data for auth request back to taker.
# Need to choose an input utxo pubkey to sign with
# (no longer using the coinjoin pubkey from 0.2.0)
# Just choose the first utxo in self.utxos and retrieve key from wallet.
auth_address = utxos[list(utxos.keys())[0]]['address']
auth_key = self.wallet_service.get_key_from_addr(auth_address)
auth_pub = btc.privkey_to_pubkey(auth_key)
# kphex was auto-converted by @hexbin but we actually need to sign the
# hex version to comply with pre-existing JM protocol:
btc_sig = btc.ecdsa_sign(bintohex(kphex), auth_key)
return (True, utxos, auth_pub, cj_addr, change_addr, btc_sig)
