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follow-up prev: do all checks, and add tests

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SomberNight 2020-02-27 05:13:31 +01:00
parent a987a2bbbe
commit c744fc4e3d
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GPG key ID: B33B5F232C6271E9
3 changed files with 100 additions and 8 deletions
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23
electrum/bip32.py
View file

@ -401,3 +401,26 @@ def root_fp_and_der_prefix_from_xkey(xkey: str) -> Tuple[Optional[str], Optional
derivation_prefix = convert_bip32_intpath_to_strpath([child_number_int])
root_fingerprint = node.fingerprint.hex()
return root_fingerprint, derivation_prefix
def is_xkey_consistent_with_key_origin_info(xkey: str, *,
derivation_prefix: str = None,
root_fingerprint: str = None) -> bool:
bip32node = BIP32Node.from_xkey(xkey)
int_path = None
if derivation_prefix is not None:
int_path = convert_bip32_path_to_list_of_uint32(derivation_prefix)
if int_path is not None and len(int_path) != bip32node.depth:
return False
if bip32node.depth == 0:
if bfh(root_fingerprint) != bip32node.calc_fingerprint_of_this_node():
return False
if bip32node.child_number != bytes(4):
return False
if int_path is not None and bip32node.depth > 0:
if int.from_bytes(bip32node.child_number, 'big') != int_path[-1]:
return False
if bip32node.depth == 1:
if bfh(root_fingerprint) != bip32node.fingerprint:
return False
return True

13
electrum/keystore.py
View file

@ -36,7 +36,7 @@ from .bitcoin import deserialize_privkey, serialize_privkey
from .transaction import Transaction, PartialTransaction, PartialTxInput, PartialTxOutput, TxInput
from .bip32 import (convert_bip32_path_to_list_of_uint32, BIP32_PRIME,
is_xpub, is_xprv, BIP32Node, normalize_bip32_derivation,
convert_bip32_intpath_to_strpath)
convert_bip32_intpath_to_strpath, is_xkey_consistent_with_key_origin_info)
from .ecc import string_to_number
from .crypto import (pw_decode, pw_encode, sha256, sha256d, PW_HASH_VERSION_LATEST,
SUPPORTED_PW_HASH_VERSIONS, UnsupportedPasswordHashVersion, hash_160)
@ -468,13 +468,10 @@ class Xpub(MasterPublicKeyMixin):
if not (root_fingerprint is None or (is_hex_str(root_fingerprint) and len(root_fingerprint) == 8)):
raise Exception("root fp must be 8 hex characters")
derivation_prefix = normalize_bip32_derivation(derivation_prefix)
calc_root_fp, calc_der_prefix = bip32.root_fp_and_der_prefix_from_xkey(self.xpub)
if (calc_root_fp is not None and root_fingerprint is not None
and calc_root_fp != root_fingerprint):
raise Exception("provided root fp inconsistent with xpub")
if (calc_der_prefix is not None and derivation_prefix is not None
and calc_der_prefix != derivation_prefix):
raise Exception("provided der prefix inconsistent with xpub")
if not is_xkey_consistent_with_key_origin_info(self.xpub,
derivation_prefix=derivation_prefix,
root_fingerprint=root_fingerprint):
raise Exception("xpub inconsistent with provided key origin info")
if root_fingerprint is not None:
self._root_fingerprint = root_fingerprint
if derivation_prefix is not None:

72
electrum/tests/test_bitcoin.py
View file

@ -9,6 +9,7 @@ from electrum.bitcoin import (public_key_to_p2pkh, address_from_private_key,
is_compressed_privkey, EncodeBase58Check, DecodeBase58Check,
script_num_to_hex, push_script, add_number_to_script, int_to_hex,
opcodes, base_encode, base_decode, BitcoinException)
from electrum import bip32
from electrum.bip32 import (BIP32Node, convert_bip32_intpath_to_strpath,
xpub_from_xprv, xpub_type, is_xprv, is_bip32_derivation,
is_xpub, convert_bip32_path_to_list_of_uint32,
@ -457,6 +458,77 @@ class Test_xprv_xpub(ElectrumTestCase):
self.assertEqual("m/0/2/1'", normalize_bip32_derivation("m/0/2/-1/"))
self.assertEqual("m/0/1'/1'/5'", normalize_bip32_derivation("m/0//-1/1'///5h"))
def test_is_xkey_consistent_with_key_origin_info(self):
### actual data (high depth path)
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/1'/0'/2'",
root_fingerprint="b2768d2f"))
# ok to skip args
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/1'/0'/2'"))
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
root_fingerprint="b2768d2f"))
# path changed: wrong depth
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/0'/2'",
root_fingerprint="b2768d2f"))
# path changed: wrong child index
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/1'/0'/3'",
root_fingerprint="b2768d2f"))
# path changed: but cannot tell
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/1'/1'/2'",
root_fingerprint="b2768d2f"))
# fp changed: but cannot tell
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"Zpub75NQordWKAkaF7utBw95GEodyxqwFdR3idtTqQtrvWkYFeiuYdg5c3Q9L9bLjPLhEahLCTjmmS2YQcXPwr6twYCEJ55k6uhE5JxRqvUowmd",
derivation_prefix="m/48'/1'/0'/2'",
root_fingerprint="aaaaaaaa"))
### actual data (depth=1 path)
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"zpub6nsHdRuY92FsMKdbn9BfjBCG6X8pyhCibNP6uDvpnw2cyrVhecvHRMa3Ne8kdJZxjxgwnpbHLkcR4bfnhHy6auHPJyDTQ3kianeuVLdkCYQ",
derivation_prefix="m/0'",
root_fingerprint="b2e35a7d"))
# path changed: wrong depth
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"zpub6nsHdRuY92FsMKdbn9BfjBCG6X8pyhCibNP6uDvpnw2cyrVhecvHRMa3Ne8kdJZxjxgwnpbHLkcR4bfnhHy6auHPJyDTQ3kianeuVLdkCYQ",
derivation_prefix="m/0'/0'",
root_fingerprint="b2e35a7d"))
# path changed: wrong child index
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"zpub6nsHdRuY92FsMKdbn9BfjBCG6X8pyhCibNP6uDvpnw2cyrVhecvHRMa3Ne8kdJZxjxgwnpbHLkcR4bfnhHy6auHPJyDTQ3kianeuVLdkCYQ",
derivation_prefix="m/1'",
root_fingerprint="b2e35a7d"))
# fp changed: can tell
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"zpub6nsHdRuY92FsMKdbn9BfjBCG6X8pyhCibNP6uDvpnw2cyrVhecvHRMa3Ne8kdJZxjxgwnpbHLkcR4bfnhHy6auHPJyDTQ3kianeuVLdkCYQ",
derivation_prefix="m/0'",
root_fingerprint="aaaaaaaa"))
### actual data (depth=0 path)
self.assertTrue(bip32.is_xkey_consistent_with_key_origin_info(
"xpub661MyMwAqRbcFWohJWt7PHsFEJfZAvw9ZxwQoDa4SoMgsDDM1T7WK3u9E4edkC4ugRnZ8E4xDZRpk8Rnts3Nbt97dPwT52CwBdDWroaZf8U",
derivation_prefix="m",
root_fingerprint="48adc7a0"))
# path changed: wrong depth
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"xpub661MyMwAqRbcFWohJWt7PHsFEJfZAvw9ZxwQoDa4SoMgsDDM1T7WK3u9E4edkC4ugRnZ8E4xDZRpk8Rnts3Nbt97dPwT52CwBdDWroaZf8U",
derivation_prefix="m/0",
root_fingerprint="48adc7a0"))
# fp changed: can tell
self.assertFalse(bip32.is_xkey_consistent_with_key_origin_info(
"xpub661MyMwAqRbcFWohJWt7PHsFEJfZAvw9ZxwQoDa4SoMgsDDM1T7WK3u9E4edkC4ugRnZ8E4xDZRpk8Rnts3Nbt97dPwT52CwBdDWroaZf8U",
derivation_prefix="m",
root_fingerprint="aaaaaaaa"))
def test_is_all_public_derivation(self):
self.assertFalse(is_all_public_derivation("m/0/1'/1'"))
self.assertFalse(is_all_public_derivation("m/0/2/1'"))