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Truncate name_hash to 80 bits. Take all array slices from Identity.NAME_HASH_LENGTH constant.

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Mark Qvist 2022-10-06 23:14:32 +02:00
parent 0b98a9bff4
commit cb55189e5c
4 changed files with 18 additions and 19 deletions
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6
RNS/Destination.py
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@ -94,7 +94,7 @@ class Destination:
"""
:returns: A destination name in adressable hash form, for an app_name and a number of aspects.
"""
name_hash = RNS.Identity.full_hash(Destination.expand_name(None, app_name, *aspects).encode("utf-8"))
name_hash = RNS.Identity.full_hash(Destination.expand_name(None, app_name, *aspects).encode("utf-8"))[:(RNS.Identity.NAME_HASH_LENGTH//8)]
addr_hash_material = name_hash
if identity != None:
addr_hash_material += identity.hash
@ -146,7 +146,7 @@ class Destination:
# Generate the destination address hash
self.hash = Destination.hash(self.identity, app_name, *aspects)
self.name_hash = RNS.Identity.full_hash(self.expand_name(None, app_name, *aspects).encode("utf-8"))
self.name_hash = RNS.Identity.full_hash(self.expand_name(None, app_name, *aspects).encode("utf-8"))[:(RNS.Identity.NAME_HASH_LENGTH//8)]
self.hexhash = self.hash.hex()
self.default_app_data = None
@ -185,8 +185,6 @@ class Destination:
if isinstance(returned_app_data, bytes):
app_data = returned_app_data
# TODO: It is probably possible truncate the name_hash to 16 bytes to
# save bandwidth without any practical impact on collision resistance
signed_data = self.hash+self.identity.get_public_key()+self.name_hash+random_hash
if app_data != None:
signed_data += app_data