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#
# SelfTest/Util/test_strxor.py: Self-test for XORing
#
# ===================================================================
#
# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================
import unittest
from binascii import unhexlify, hexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.strxor import strxor, strxor_c
class StrxorTests(unittest.TestCase):
def test1(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"383d4ba020573314395b")
result = unhexlify(b"c70ed123c59a7fcb6f12")
self.assertEqual(strxor(term1, term2), result)
self.assertEqual(strxor(term2, term1), result)
def test2(self):
es = b""
self.assertEqual(strxor(es, es), es)
def test3(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
all_zeros = b"\x00" * len(term1)
self.assertEqual(strxor(term1, term1), all_zeros)
def test_wrong_length(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"ff339a83e5cd4cdf564990")
self.assertRaises(ValueError, strxor, term1, term2)
def test_bytearray(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term1_ba = bytearray(term1)
term2 = unhexlify(b"383d4ba020573314395b")
result = unhexlify(b"c70ed123c59a7fcb6f12")
self.assertEqual(strxor(term1_ba, term2), result)
def test_memoryview(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term1_mv = memoryview(term1)
term2 = unhexlify(b"383d4ba020573314395b")
result = unhexlify(b"c70ed123c59a7fcb6f12")
self.assertEqual(strxor(term1_mv, term2), result)
def test_output_bytearray(self):
"""Verify result can be stored in pre-allocated memory"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"383d4ba020573314395b")
original_term1 = term1[:]
original_term2 = term2[:]
expected_xor = unhexlify(b"c70ed123c59a7fcb6f12")
output = bytearray(len(term1))
result = strxor(term1, term2, output=output)
self.assertEqual(result, None)
self.assertEqual(output, expected_xor)
self.assertEqual(term1, original_term1)
self.assertEqual(term2, original_term2)
def test_output_memoryview(self):
"""Verify result can be stored in pre-allocated memory"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"383d4ba020573314395b")
original_term1 = term1[:]
original_term2 = term2[:]
expected_xor = unhexlify(b"c70ed123c59a7fcb6f12")
output = memoryview(bytearray(len(term1)))
result = strxor(term1, term2, output=output)
self.assertEqual(result, None)
self.assertEqual(output, expected_xor)
self.assertEqual(term1, original_term1)
self.assertEqual(term2, original_term2)
def test_output_overlapping_bytearray(self):
"""Verify result can be stored in overlapping memory"""
term1 = bytearray(unhexlify(b"ff339a83e5cd4cdf5649"))
term2 = unhexlify(b"383d4ba020573314395b")
original_term2 = term2[:]
expected_xor = unhexlify(b"c70ed123c59a7fcb6f12")
result = strxor(term1, term2, output=term1)
self.assertEqual(result, None)
self.assertEqual(term1, expected_xor)
self.assertEqual(term2, original_term2)
def test_output_overlapping_memoryview(self):
"""Verify result can be stored in overlapping memory"""
term1 = memoryview(bytearray(unhexlify(b"ff339a83e5cd4cdf5649")))
term2 = unhexlify(b"383d4ba020573314395b")
original_term2 = term2[:]
expected_xor = unhexlify(b"c70ed123c59a7fcb6f12")
result = strxor(term1, term2, output=term1)
self.assertEqual(result, None)
self.assertEqual(term1, expected_xor)
self.assertEqual(term2, original_term2)
def test_output_ro_bytes(self):
"""Verify result cannot be stored in read-only memory"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"383d4ba020573314395b")
self.assertRaises(TypeError, strxor, term1, term2, output=term1)
def test_output_ro_memoryview(self):
"""Verify result cannot be stored in read-only memory"""
term1 = memoryview(unhexlify(b"ff339a83e5cd4cdf5649"))
term2 = unhexlify(b"383d4ba020573314395b")
self.assertRaises(TypeError, strxor, term1, term2, output=term1)
def test_output_incorrect_length(self):
"""Verify result cannot be stored in memory of incorrect length"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term2 = unhexlify(b"383d4ba020573314395b")
output = bytearray(len(term1) - 1)
self.assertRaises(ValueError, strxor, term1, term2, output=output)
class Strxor_cTests(unittest.TestCase):
def test1(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
result = unhexlify(b"be72dbc2a48c0d9e1708")
self.assertEqual(strxor_c(term1, 65), result)
def test2(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
self.assertEqual(strxor_c(term1, 0), term1)
def test3(self):
self.assertEqual(strxor_c(b"", 90), b"")
def test_wrong_range(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
self.assertRaises(ValueError, strxor_c, term1, -1)
self.assertRaises(ValueError, strxor_c, term1, 256)
def test_bytearray(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term1_ba = bytearray(term1)
result = unhexlify(b"be72dbc2a48c0d9e1708")
self.assertEqual(strxor_c(term1_ba, 65), result)
def test_memoryview(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
term1_mv = memoryview(term1)
result = unhexlify(b"be72dbc2a48c0d9e1708")
self.assertEqual(strxor_c(term1_mv, 65), result)
def test_output_bytearray(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
original_term1 = term1[:]
expected_result = unhexlify(b"be72dbc2a48c0d9e1708")
output = bytearray(len(term1))
result = strxor_c(term1, 65, output=output)
self.assertEqual(result, None)
self.assertEqual(output, expected_result)
self.assertEqual(term1, original_term1)
def test_output_memoryview(self):
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
original_term1 = term1[:]
expected_result = unhexlify(b"be72dbc2a48c0d9e1708")
output = memoryview(bytearray(len(term1)))
result = strxor_c(term1, 65, output=output)
self.assertEqual(result, None)
self.assertEqual(output, expected_result)
self.assertEqual(term1, original_term1)
def test_output_overlapping_bytearray(self):
"""Verify result can be stored in overlapping memory"""
term1 = bytearray(unhexlify(b"ff339a83e5cd4cdf5649"))
expected_xor = unhexlify(b"be72dbc2a48c0d9e1708")
result = strxor_c(term1, 65, output=term1)
self.assertEqual(result, None)
self.assertEqual(term1, expected_xor)
def test_output_overlapping_memoryview(self):
"""Verify result can be stored in overlapping memory"""
term1 = memoryview(bytearray(unhexlify(b"ff339a83e5cd4cdf5649")))
expected_xor = unhexlify(b"be72dbc2a48c0d9e1708")
result = strxor_c(term1, 65, output=term1)
self.assertEqual(result, None)
self.assertEqual(term1, expected_xor)
def test_output_ro_bytes(self):
"""Verify result cannot be stored in read-only memory"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
self.assertRaises(TypeError, strxor_c, term1, 65, output=term1)
def test_output_ro_memoryview(self):
"""Verify result cannot be stored in read-only memory"""
term1 = memoryview(unhexlify(b"ff339a83e5cd4cdf5649"))
term2 = unhexlify(b"383d4ba020573314395b")
self.assertRaises(TypeError, strxor_c, term1, 65, output=term1)
def test_output_incorrect_length(self):
"""Verify result cannot be stored in memory of incorrect length"""
term1 = unhexlify(b"ff339a83e5cd4cdf5649")
output = bytearray(len(term1) - 1)
self.assertRaises(ValueError, strxor_c, term1, 65, output=output)
def get_tests(config={}):
tests = []
tests += list_test_cases(StrxorTests)
tests += list_test_cases(Strxor_cTests)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')