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tests.py
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tests.py
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import unittest
from lext import lext, hashfuncs
import hashlib
import os
from random import randint
class MAC:
"""Simulate a server that authenticate a message (MAC)"""
def __init__(self, method):
self.method = method
self.key_len = randint(0, 64)
self.key = os.urandom(self.key_len)
self.message = b"count=10&lat=37.351&user_id=1&long=-119.827&waffle=eggo"
self.sig = self.gen_mac(self.message)
def gen_mac(self, message):
return hashlib.new(self.method, self.key + message).hexdigest()
def is_valid(self, message, signature):
"""Return true if signature is valid"""
return self.gen_mac(message) == signature
def get_hashlib_ref_sig(data, method):
ref = hashlib.new(method)
ref.update(data)
return ref.hexdigest()
class TestSHA1(unittest.TestCase):
def test_length_extension_attack(self):
"""Test SHA1 length extension attack (key length is known)"""
m = MAC("sha1")
inj, sig = lext(
data=m.message,
inject=b"&waffle=liege",
signature=m.sig,
secret_length=m.key_len,
method="sha1",
)
self.assertTrue(m.is_valid(inj, sig))
def test_hexdigest(self):
"""Test SHA1 hexdigest against hashlib as reference"""
for _ in range(10):
data = os.urandom(randint(0, 9999))
with self.subTest(data=data):
self.assertEqual(
hashfuncs.new("sha1").hexdigest(data),
get_hashlib_ref_sig(data, "sha1"),
)
class TestSHA256(unittest.TestCase):
def test_length_extension_attack(self):
"""Test SHA256 length extension attack (key length is known)"""
m = MAC("sha256")
inj, sig = lext(
data=m.message,
inject=b"&waffle=liege",
signature=m.sig,
secret_length=m.key_len,
method="sha256",
)
self.assertTrue(m.is_valid(inj, sig))
def test_hexdigest(self):
"""Test SHA256 hexdigest against hashlib as reference"""
for _ in range(10):
data = os.urandom(randint(0, 9999))
with self.subTest(data=data):
self.assertEqual(
hashfuncs.new("sha256").hexdigest(data),
get_hashlib_ref_sig(data, "sha256"),
)
class TestSHA512(unittest.TestCase):
def test_length_extension_attack(self):
"""Test SHA512 length extension attack (key length is known)"""
m = MAC("sha512")
inj, sig = lext(
data=m.message,
inject=b"&waffle=liege",
signature=m.sig,
secret_length=m.key_len,
method="sha512",
)
self.assertTrue(m.is_valid(inj, sig))
def test_hexdigest(self):
"""Test SHA512 hexdigest against hashlib as reference"""
for _ in range(10):
data = os.urandom(randint(0, 9999))
with self.subTest(data=data):
self.assertEqual(
hashfuncs.new("sha512").hexdigest(data),
get_hashlib_ref_sig(data, "sha512"),
)
class TestMD5(unittest.TestCase):
def test_length_extension_attack(self):
"""Test MD5 length extension attack (key length is known)"""
m = MAC("md5")
inj, sig = lext(
data=m.message,
inject=b"&waffle=liege",
signature=m.sig,
secret_length=m.key_len,
method="md5",
)
self.assertTrue(m.is_valid(inj, sig))
def test_hexdigest(self):
"""Test MD5 hexdigest against hashlib as reference"""
for _ in range(10):
data = os.urandom(randint(0, 9999))
with self.subTest(data=data):
self.assertEqual(
hashfuncs.new("md5").hexdigest(data),
get_hashlib_ref_sig(data, "md5"),
)
if __name__ == "__main__":
unittest.main()