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Editing: test_DES3.py
# -*- coding: utf-8 -*- # # SelfTest/Cipher/DES3.py: Self-test for the Triple-DES cipher # # Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net> # # =================================================================== # The contents of this file are dedicated to the public domain. To # the extent that dedication to the public domain is not available, # everyone is granted a worldwide, perpetual, royalty-free, # non-exclusive license to exercise all rights associated with the # contents of this file for any purpose whatsoever. # No rights are reserved. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # =================================================================== """Self-test suite for Crypto.Cipher.DES3""" import unittest from binascii import hexlify, unhexlify from Crypto.Cipher import DES3 from Crypto.Util.strxor import strxor_c from Crypto.Util.py3compat import bchr, tostr from Crypto.SelfTest.loader import load_test_vectors from Crypto.SelfTest.st_common import list_test_cases # This is a list of (plaintext, ciphertext, key, description) tuples. test_data = [ # Test vector from Appendix B of NIST SP 800-67 # "Recommendation for the Triple Data Encryption Algorithm (TDEA) Block # Cipher" # http://csrc.nist.gov/publications/nistpubs/800-67/SP800-67.pdf ('54686520717566636b2062726f776e20666f78206a756d70', 'a826fd8ce53b855fcce21c8112256fe668d5c05dd9b6b900', '0123456789abcdef23456789abcdef01456789abcdef0123', 'NIST SP800-67 B.1'), # This test is designed to test the DES3 API, not the correctness of the # output. ('21e81b7ade88a259', '5c577d4d9b20c0f8', '9b397ebf81b1181e282f4bb8adbadc6b', 'Two-key 3DES'), ] # NIST CAVP test vectors nist_tdes_mmt_files = ("TECBMMT2.rsp", "TECBMMT3.rsp") for tdes_file in nist_tdes_mmt_files: test_vectors = load_test_vectors( ("Cipher", "TDES"), tdes_file, "TDES ECB (%s)" % tdes_file, {"count": lambda x: int(x)}) or [] for index, tv in enumerate(test_vectors): # The test vector file contains some directive lines if isinstance(tv, str): continue key = tv.key1 + tv.key2 + tv.key3 test_data_item = (tostr(hexlify(tv.plaintext)), tostr(hexlify(tv.ciphertext)), tostr(hexlify(key)), "%s (%s)" % (tdes_file, index)) test_data.append(test_data_item) class CheckParity(unittest.TestCase): def test_parity_option2(self): before_2k = unhexlify("CABF326FA56734324FFCCABCDEFACABF") after_2k = DES3.adjust_key_parity(before_2k) self.assertEqual(after_2k, unhexlify("CBBF326EA46734324FFDCBBCDFFBCBBF")) def test_parity_option3(self): before_3k = unhexlify("AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCC") after_3k = DES3.adjust_key_parity(before_3k) self.assertEqual(after_3k, unhexlify("ABABABABABABABABBABABABABABABABACDCDCDCDCDCDCDCD")) def test_degradation(self): sub_key1 = bchr(1) * 8 sub_key2 = bchr(255) * 8 # K1 == K2 self.assertRaises(ValueError, DES3.adjust_key_parity, sub_key1 * 2 + sub_key2) # K2 == K3 self.assertRaises(ValueError, DES3.adjust_key_parity, sub_key1 + sub_key2 * 2) # K1 == K2 == K3 self.assertRaises(ValueError, DES3.adjust_key_parity, sub_key1 * 3) # K1 == K2 (with different parity) self.assertRaises(ValueError, DES3.adjust_key_parity, sub_key1 + strxor_c(sub_key1, 1) + sub_key2) class DegenerateToDESTest(unittest.TestCase): def runTest(self): sub_key1 = bchr(1) * 8 sub_key2 = bchr(255) * 8 # K1 == K2 self.assertRaises(ValueError, DES3.new, sub_key1 * 2 + sub_key2, DES3.MODE_ECB) # K2 == K3 self.assertRaises(ValueError, DES3.new, sub_key1 + sub_key2 * 2, DES3.MODE_ECB) # K1 == K2 == K3 self.assertRaises(ValueError, DES3.new, sub_key1 * 3, DES3.MODE_ECB) # K2 == K3 (parity is ignored) self.assertRaises(ValueError, DES3.new, sub_key1 + sub_key2 + strxor_c(sub_key2, 0x1), DES3.MODE_ECB) class TestOutput(unittest.TestCase): def runTest(self): # Encrypt/Decrypt data and test output parameter cipher = DES3.new(b'4'*8 + b'G'*8 + b'T'*8, DES3.MODE_ECB) pt = b'5' * 16 ct = cipher.encrypt(pt) output = bytearray(16) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) output = memoryview(bytearray(16)) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16) shorter_output = bytearray(7) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output) def get_tests(config={}): from .common import make_block_tests tests = [] tests = make_block_tests(DES3, "DES3", test_data) tests.append(DegenerateToDESTest()) tests += list_test_cases(CheckParity) tests += [TestOutput()] return tests if __name__ == '__main__': import unittest def suite(): unittest.TestSuite(get_tests()) unittest.main(defaultTest='suite') # vim:set ts=4 sw=4 sts=4 expandtab:
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