electrum

Electrum Bitcoin wallet
git clone https://git.parazyd.org/electrum
Log | Files | Refs | Submodules

commit 3a20c8ce000aa8f270d407da9d2ad03f7d980d4b
parent cf82150aab0b288a2c24f27812ba88a0d7a37793
Author: Janus <ysangkok@gmail.com>
Date:   Fri, 11 May 2018 15:43:47 +0200

lnbase: add RevocationStore test, remove unnecessary lnd helper functions

Diffstat:
Mlib/lnbase.py | 47++++++-----------------------------------------
Mlib/tests/test_lnbase.py | 49++++++++++++++++---------------------------------
2 files changed, 22 insertions(+), 74 deletions(-)

diff --git a/lib/lnbase.py b/lib/lnbase.py @@ -320,30 +320,18 @@ def derive_blinded_pubkey(basepoint, per_commitment_point): return point_to_ser(k1 + k2) def shachain_derive(element, toIndex): - """ compact per-commitment secret storage, taken from lnd """ - fromIndex = element.index - positions = derive_bit_transformations(fromIndex, toIndex) - buf = bytearray(element.secret) - for position in positions: - byteNumber = position // 8 - bitNumber = position % 8 - buf[byteNumber] ^= 1 << bitNumber - h = bitcoin.sha256(buf) - buf = bytearray(h) + return ShachainElement(get_per_commitment_secret_from_seed(element.secret, toIndex, count_trailing_zeros(element.index)), toIndex) - return ShachainElement(index=toIndex, secret=bytes(buf)) - -def get_per_commitment_secret_from_seed(seed: bytes, i: int, bits: int = 47) -> bytes: +def get_per_commitment_secret_from_seed(seed: bytes, i: int, bits: int = 48) -> bytes: """Generate per commitment secret.""" per_commitment_secret = bytearray(seed) - for bitindex in range(bits, -1, -1): + for bitindex in range(bits - 1, -1, -1): mask = 1 << bitindex if i & mask: per_commitment_secret[bitindex // 8] ^= 1 << (bitindex % 8) per_commitment_secret = bytearray(bitcoin.sha256(per_commitment_secret)) bajts = bytes(per_commitment_secret) - assert shachain_derive(ShachainElement(index=0, secret=seed), i).secret == bajts return bajts @@ -1569,44 +1557,21 @@ def count_trailing_zeros(index): return 48 ShachainElement = namedtuple("ShachainElement", ["secret", "index"]) +ShachainElement.__str__ = lambda self: "ShachainElement(" + bh2u(self.secret) + "," + str(self.index) + ")" class RevocationStore: """ taken from lnd """ def __init__(self): - self.buckets = {} + self.buckets = [None] * 48 self.index = 2**48 - 1 - def set_index(self, index): - self.index = index def add_next_entry(self, hsh): new_element = ShachainElement(index=self.index, secret=hsh) bucket = count_trailing_zeros(self.index) for i in range(0, bucket): - if i not in self.buckets: return this_bucket = self.buckets[i] e = shachain_derive(new_element, this_bucket.index) if e != this_bucket: - return "hash is not derivable: {} {} {}".format(bh2u(e.secret), bh2u(this_bucket.secret), this_bucket.index) + raise Exception("hash is not derivable: {} {} {}".format(bh2u(e.secret), bh2u(this_bucket.secret), this_bucket.index)) self.buckets[bucket] = new_element self.index -= 1 - return - -def get_prefix(index, position): - """ taken from lnd """ - mask = (1<<64)-1 - ((1<<position)-1) - return index & mask - -def derive_bit_transformations(fromm, to): - """ taken from lnd """ - positions = [] - if fromm == to: return positions - - zeros = count_trailing_zeros(fromm) - if fromm > (1<<64)-1: raise Exception("fromm too big") - if fromm != get_prefix(to, zeros): - raise Exception("prefixes are different, indexes are not derivable") - - for position in range(zeros, -1, -1): - if to >> position & 1 == 1: - positions.append(position) - return positions diff --git a/lib/tests/test_lnbase.py b/lib/tests/test_lnbase.py @@ -7,7 +7,7 @@ from lib.lnbase import make_commitment, get_obscured_ctn, Peer, make_offered_htl from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey, derive_blinded_pubkey, overall_weight from lib.lnbase import make_htlc_tx_output, make_htlc_tx_inputs, get_per_commitment_secret_from_seed from lib.lnbase import make_htlc_tx_witness, OnionHopsDataSingle, new_onion_packet, OnionPerHop -from lib.lnbase import RevocationStore, derive_bit_transformations +from lib.lnbase import RevocationStore, ShachainElement, shachain_derive from lib.transaction import Transaction from lib import bitcoin import ecdsa.ellipticcurve @@ -385,27 +385,6 @@ class Test_LNBase(unittest.TestCase): self.assertEqual(hops_data[i].per_hop.to_bytes(), processed_packet.hop_data.per_hop.to_bytes()) packet = processed_packet.next_packet - def test_shachain_producer(self): - from collections import namedtuple - tests = [] - DeriveTest = namedtuple("DeriveTest", ["name", "fromm", "to", "position", "should_fail"]) - tests.append(DeriveTest("zero 'from' 'to'", 0, 0, [], False)) - tests.append(DeriveTest("same indexes #1", 0b100, 0b100, [], False)) - tests.append(DeriveTest("same indexes #2", 0b1, 0b0, None, True)) - tests.append(DeriveTest("test seed 'from'", 0b0, 0b10, [1], False)) - tests.append(DeriveTest("not the same indexes", 0b1100, 0b0100, None, True)) - tests.append(DeriveTest("'from' index greater than 'to' index", 0b1010, 0b1000, None, True)) - tests.append(DeriveTest("zero number trailing zeros", 0b1, 0b1, [], False)) - for test in tests: - try: - pos = derive_bit_transformations(test.fromm, test.to) - if test.should_fail: - raise Exception("test did not fail") - self.assertEqual(test.position, pos) - except: - if not test.should_fail: - raise Exception(test.name) - def test_shachain_store(self): tests = [ { @@ -792,23 +771,27 @@ class Test_LNBase(unittest.TestCase): ] for test in tests: - old_receiver = None - receiver = None + receiver = RevocationStore() for insert in test["inserts"]: - old_receiver = receiver - receiver = RevocationStore() secret = bytes.fromhex(insert["secret"]) - if not insert["successful"]: - receiver.set_index(old_receiver.index) - receiver.buckets = old_receiver.buckets - secret = secret[::-1] - err = receiver.add_next_entry(secret) - if isinstance(err, str): + try: + receiver.add_next_entry(secret) + except Exception as e: if insert["successful"]: - raise Exception("Failed ({}): error was received but it shouldn't: {}".format(test["name"], err)) + raise Exception("Failed ({}): error was received but it shouldn't: {}".format(test["name"], e)) else: if not insert["successful"]: raise Exception("Failed ({}): error wasn't received".format(test["name"])) print("Passed ({})".format(test["name"])) + + def test_shachain_produce_consume(self): + seed = bitcoin.sha256(b"shachaintest") + consumer = RevocationStore() + for i in range(10000): + secret = shachain_derive(ShachainElement(seed, 0), 2**48 - i - 1).secret + try: + consumer.add_next_entry(secret) + except Exception as e: + raise Exception("iteration " + str(i) + ": " + str(e))