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 make_commitment(self):
"""The Taker default commitment function, which uses PoDLE.
Alternative commitment types should use a different commit type byte.
This will allow future upgrades to provide different style commitments
by subclassing Taker and changing the commit_type_byte; existing makers
will simply not accept this new type of commitment.
In case of success, return the commitment and its opening.
In case of failure returns (None, None) and constructs a detailed
log for the user to read and discern the reason.
"""
def filter_by_coin_age_amt(utxos, age, amt):
results = jm_single().bc_interface.query_utxo_set(utxos,
includeconf=True)
newresults = []
too_old = []
too_small = []
for i, r in enumerate(results):
#results return "None" if txo is spent; drop this
if not r:
continue
valid_age = r['confirms'] >= age
valid_amt = r['value'] >= amt
if not valid_age:
too_old.append(utxos[i])
if not valid_amt:
too_small.append(utxos[i])
if valid_age and valid_amt:
newresults.append(utxos[i])
return newresults, too_old, too_small
def priv_utxo_pairs_from_utxos(utxos, age, amt):
#returns pairs list of (priv, utxo) for each valid utxo;
#also returns lists "too_old" and "too_small" for any
#utxos that did not satisfy the criteria for debugging.
priv_utxo_pairs = []
new_utxos, too_old, too_small = filter_by_coin_age_amt(
utxos.keys(), age, amt)
new_utxos_dict = {k: v for k, v in utxos.items() if k in new_utxos}
for k, v in new_utxos_dict.iteritems():
addr = v['address']
priv = self.wallet.get_key_from_addr(addr)
if priv: #can be null from create-unsigned
priv_utxo_pairs.append((priv, k))
return priv_utxo_pairs, too_old, too_small
commit_type_byte = "P"
podle_data = None
tries = jm_single().config.getint("POLICY", "taker_utxo_retries")
age = jm_single().config.getint("POLICY", "taker_utxo_age")
#Minor rounding errors don't matter here
amt = int(
self.cjamount *
jm_single().config.getint("POLICY", "taker_utxo_amtpercent") /
100.0)
priv_utxo_pairs, to, ts = priv_utxo_pairs_from_utxos(
self.input_utxos, age, amt)
#Note that we ignore the "too old" and "too small" lists in the first
#pass through, because the same utxos appear in the whole-wallet check.
#For podle data format see: podle.PoDLE.reveal()
#In first round try, don't use external commitments
podle_data = generate_podle(priv_utxo_pairs, tries)
if not podle_data:
#We defer to a second round to try *all* utxos in wallet;
#this is because it's much cleaner to use the utxos involved
#in the transaction, about to be consumed, rather than use
#random utxos that will persist after. At this step we also
#allow use of external utxos in the json file.
if self.wallet.unspent:
priv_utxo_pairs, to, ts = priv_utxo_pairs_from_utxos(
self.wallet.unspent, age, amt)
#Pre-filter the set of external commitments that work for this
#transaction according to its size and age.
dummy, extdict = get_podle_commitments()
if len(extdict.keys()) > 0:
ext_valid, ext_to, ext_ts = filter_by_coin_age_amt(
extdict.keys(), age, amt)
else:
ext_valid = None
podle_data = generate_podle(priv_utxo_pairs, tries, ext_valid)
if podle_data:
jlog.debug("Generated PoDLE: " + pprint.pformat(podle_data))
revelation = PoDLE(u=podle_data['utxo'],
P=podle_data['P'],
P2=podle_data['P2'],
s=podle_data['sig'],
e=podle_data['e']).serialize_revelation()
return (commit_type_byte + podle_data["commit"], revelation,
"Commitment sourced OK")
else:
errmsgheader, errmsg = generate_podle_error_string(
priv_utxo_pairs, to, ts, self.wallet.unspent, self.cjamount,
jm_single().config.get("POLICY", "taker_utxo_age"),
jm_single().config.get("POLICY", "taker_utxo_amtpercent"))
with open("commitments_debug.txt", "wb") as f:
errmsgfileheader = ("THIS IS A TEMPORARY FILE FOR DEBUGGING; "
"IT CAN BE SAFELY DELETED ANY TIME.\n")
errmsgfileheader += ("***\n")
f.write(errmsgfileheader + errmsg)
return (None, (priv_utxo_pairs, to, ts), errmsgheader + errmsg)
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)
