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

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This commit is contained in:
SomberNight
2020-02-27 05:13:31 +01:00
parent a987a2bbbe
commit c744fc4e3d
3 changed files with 100 additions and 8 deletions
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23
electrum/bip32.py
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@@ -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