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#
# SelfTest/Util/test_Padding.py: Self-test for padding functions
#
# ===================================================================
#
# 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 as uh
from Crypto.Util.py3compat import *
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.Padding import pad, unpad
class PKCS7_Tests(unittest.TestCase):
def test1(self):
padded = pad(b(""), 4)
self.assertTrue(padded == uh(b("04040404")))
padded = pad(b(""), 4, 'pkcs7')
self.assertTrue(padded == uh(b("04040404")))
back = unpad(padded, 4)
self.assertTrue(back == b(""))
def test2(self):
padded = pad(uh(b("12345678")), 4)
self.assertTrue(padded == uh(b("1234567804040404")))
back = unpad(padded, 4)
self.assertTrue(back == uh(b("12345678")))
def test3(self):
padded = pad(uh(b("123456")), 4)
self.assertTrue(padded == uh(b("12345601")))
back = unpad(padded, 4)
self.assertTrue(back == uh(b("123456")))
def test4(self):
padded = pad(uh(b("1234567890")), 4)
self.assertTrue(padded == uh(b("1234567890030303")))
back = unpad(padded, 4)
self.assertTrue(back == uh(b("1234567890")))
def testn1(self):
self.assertRaises(ValueError, pad, uh(b("12")), 4, 'pkcs8')
def testn2(self):
self.assertRaises(ValueError, unpad, b("\0\0\0"), 4)
self.assertRaises(ValueError, unpad, b(""), 4)
def testn3(self):
self.assertRaises(ValueError, unpad, b("123456\x02"), 4)
self.assertRaises(ValueError, unpad, b("123456\x00"), 4)
self.assertRaises(ValueError, unpad, b("123456\x05\x05\x05\x05\x05"), 4)
class X923_Tests(unittest.TestCase):
def test1(self):
padded = pad(b(""), 4, 'x923')
self.assertTrue(padded == uh(b("00000004")))
back = unpad(padded, 4, 'x923')
self.assertTrue(back == b(""))
def test2(self):
padded = pad(uh(b("12345678")), 4, 'x923')
self.assertTrue(padded == uh(b("1234567800000004")))
back = unpad(padded, 4, 'x923')
self.assertTrue(back == uh(b("12345678")))
def test3(self):
padded = pad(uh(b("123456")), 4, 'x923')
self.assertTrue(padded == uh(b("12345601")))
back = unpad(padded, 4, 'x923')
self.assertTrue(back == uh(b("123456")))
def test4(self):
padded = pad(uh(b("1234567890")), 4, 'x923')
self.assertTrue(padded == uh(b("1234567890000003")))
back = unpad(padded, 4, 'x923')
self.assertTrue(back == uh(b("1234567890")))
def testn1(self):
self.assertRaises(ValueError, unpad, b("123456\x02"), 4, 'x923')
self.assertRaises(ValueError, unpad, b("123456\x00"), 4, 'x923')
self.assertRaises(ValueError, unpad, b("123456\x00\x00\x00\x00\x05"), 4, 'x923')
self.assertRaises(ValueError, unpad, b(""), 4, 'x923')
class ISO7816_Tests(unittest.TestCase):
def test1(self):
padded = pad(b(""), 4, 'iso7816')
self.assertTrue(padded == uh(b("80000000")))
back = unpad(padded, 4, 'iso7816')
self.assertTrue(back == b(""))
def test2(self):
padded = pad(uh(b("12345678")), 4, 'iso7816')
self.assertTrue(padded == uh(b("1234567880000000")))
back = unpad(padded, 4, 'iso7816')
self.assertTrue(back == uh(b("12345678")))
def test3(self):
padded = pad(uh(b("123456")), 4, 'iso7816')
self.assertTrue(padded == uh(b("12345680")))
#import pdb; pdb.set_trace()
back = unpad(padded, 4, 'iso7816')
self.assertTrue(back == uh(b("123456")))
def test4(self):
padded = pad(uh(b("1234567890")), 4, 'iso7816')
self.assertTrue(padded == uh(b("1234567890800000")))
back = unpad(padded, 4, 'iso7816')
self.assertTrue(back == uh(b("1234567890")))
def testn1(self):
self.assertRaises(ValueError, unpad, b("123456\x81"), 4, 'iso7816')
self.assertRaises(ValueError, unpad, b(""), 4, 'iso7816')
def get_tests(config={}):
tests = []
tests += list_test_cases(PKCS7_Tests)
tests += list_test_cases(X923_Tests)
tests += list_test_cases(ISO7816_Tests)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
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