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

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This commit is contained in:
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
View File

@ -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

13
RNS/Identity.py
View File

@ -58,6 +58,7 @@ class Identity:
HASHLENGTH = 256 # In bits
SIGLENGTH = KEYSIZE # In bits
NAME_HASH_LENGTH = 80
TRUNCATED_HASHLENGTH = RNS.Reticulum.TRUNCATED_HASHLENGTH
"""
Constant specifying the truncated hash length (in bits) used by Reticulum
@ -214,16 +215,16 @@ class Identity:
if packet.packet_type == RNS.Packet.ANNOUNCE:
destination_hash = packet.destination_hash
public_key = packet.data[:Identity.KEYSIZE//8]
name_hash = packet.data[Identity.KEYSIZE//8:Identity.KEYSIZE//8+Identity.HASHLENGTH//8]
random_hash = packet.data[Identity.KEYSIZE//8+Identity.HASHLENGTH//8:Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10]
signature = packet.data[Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10:Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10+Identity.SIGLENGTH//8]
name_hash = packet.data[Identity.KEYSIZE//8:Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8]
random_hash = packet.data[Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8:Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10]
signature = packet.data[Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10:Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10+Identity.SIGLENGTH//8]
app_data = b""
if len(packet.data) > Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10+Identity.SIGLENGTH//8:
app_data = packet.data[Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10+Identity.SIGLENGTH//8:]
if len(packet.data) > Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10+Identity.SIGLENGTH//8:
app_data = packet.data[Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10+Identity.SIGLENGTH//8:]
signed_data = destination_hash+public_key+name_hash+random_hash+app_data
if not len(packet.data) > Identity.KEYSIZE//8+Identity.HASHLENGTH//8+10+Identity.SIGLENGTH//8:
if not len(packet.data) > Identity.KEYSIZE//8+Identity.NAME_HASH_LENGTH//8+10+Identity.SIGLENGTH//8:
app_data = None
announced_identity = Identity(create_keys=False)

4
RNS/Transport.py
View File

@ -1084,7 +1084,7 @@ class Transport:
if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
announce_emitted = Transport.announce_emitted(packet)
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+10]
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8+10]
random_blobs = []
if packet.destination_hash in Transport.destination_table:
random_blobs = Transport.destination_table[packet.destination_hash][4]
@ -2054,7 +2054,7 @@ class Transport:
@staticmethod
def announce_emitted(packet):
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.HASHLENGTH//8+10]
random_blob = packet.data[RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8:RNS.Identity.KEYSIZE//8+RNS.Identity.NAME_HASH_LENGTH//8+10]
announce_emitted = int.from_bytes(random_blob[5:10], "big")
return announce_emitted

14
tests/link.py
View File

@ -89,7 +89,7 @@ class TestLink(unittest.TestCase):
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -109,7 +109,7 @@ class TestLink(unittest.TestCase):
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -176,7 +176,7 @@ class TestLink(unittest.TestCase):
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -211,7 +211,7 @@ class TestLink(unittest.TestCase):
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -245,7 +245,7 @@ class TestLink(unittest.TestCase):
self.assertEqual(id1.hash, bytes.fromhex(fixed_keys[0][1]))
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -284,7 +284,7 @@ class TestLink(unittest.TestCase):
self.assertEqual(id1.hash, bytes.fromhex(fixed_keys[0][1]))
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)
@ -322,7 +322,7 @@ class TestLink(unittest.TestCase):
self.assertEqual(id1.hash, bytes.fromhex(fixed_keys[0][1]))
dest = RNS.Destination(id1, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "link", "establish")
self.assertEqual(dest.hash, bytes.fromhex("46238cb662b2fc7342de77d7c84abb5c"))
self.assertEqual(dest.hash, bytes.fromhex("fb48da0e82e6e01ba0c014513f74540d"))
l1 = RNS.Link(dest)
time.sleep(0.5)