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bpo-41004: Resolve hash collisions for IPv4Interface and IPv6Interface (GH-21033)

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The __hash__() methods of classes IPv4Interface and IPv6Interface had issue
of generating constant hash values of 32 and 128 respectively causing hash collisions.
The fix uses the hash() function to generate hash values for the objects
instead of XOR operation
(cherry picked from commit b30ee26e36)

Co-authored-by: Ravi Teja P <rvteja92@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-06-29 11:15:32 -07:00 • committed by GitHub
parent 990efe0fff
commit 9a646aa82d
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3 changed files with 15 additions and 2 deletions
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12
Lib/test/test_ipaddress.py
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@ -2548,6 +2548,18 @@ class IpaddrUnitTest(unittest.TestCase):
sixtofouraddr.sixtofour)
self.assertFalse(bad_addr.sixtofour)
# issue41004 Hash collisions in IPv4Interface and IPv6Interface
def testV4HashIsNotConstant(self):
ipv4_address1 = ipaddress.IPv4Interface("1.2.3.4")
ipv4_address2 = ipaddress.IPv4Interface("2.3.4.5")
self.assertNotEqual(ipv4_address1.__hash__(), ipv4_address2.__hash__())
# issue41004 Hash collisions in IPv4Interface and IPv6Interface
def testV6HashIsNotConstant(self):
ipv6_address1 = ipaddress.IPv6Interface("2001:658:22a:cafe:200:0:0:1")
ipv6_address2 = ipaddress.IPv6Interface("2001:658:22a:cafe:200:0:0:2")
self.assertNotEqual(ipv6_address1.__hash__(), ipv6_address2.__hash__())
if __name__ == '__main__':
unittest.main()