3DES implementation #202

avargaRH · 2018-01-22T13:58:12Z

This is the very first edition to triple DES. python_tripledes.py contains three classes, so it needs compress to one (optionally isolate the python_des.py file) code.

This change is

tomato42

quite a few nits, please fix them

test cases are missing

tomato42 · 2018-02-26T15:05:21Z

tlslite/utils/python_tripledes.py

+        # Sanity checking of arguments.
+        if IV and len(IV) != self.block_size:
+            raise ValueError("Invalid Initial Value (IV), must be \
+                a multiple of " + str(self.block_size) + " bytes")


this will result in an error with a newline, also format() operator should be used for string interpolation:

raise ValueError("Invalid Initial Value (IV), must be " "a multiple of {0} bytes".format(self.block_size))

tomato42 · 2018-02-26T15:07:03Z

tlslite/utils/python_tripledes.py

+
+        self._iv = IV
+
+    def getKey(self):


key should be a property

tomato42 · 2018-02-26T15:07:18Z

tlslite/utils/python_tripledes.py

+        key = self._guardAgainstUnicode(key)
+        self.__key = key
+
+    def getIV(self):


iv should be a property

tomato42 · 2018-02-26T15:08:59Z

tlslite/utils/python_tripledes.py

+        _baseDes.setKey(self, key)
+        self.__create_sub_keys()
+
+    def __String_to_BitList(self, data):


methods names should not use upper case letters

tomato42 · 2018-02-26T15:10:29Z

tlslite/utils/python_tripledes.py

+        _baseDes.__init__(self, IV)
+        self.setKey(key)
+
+    def setKey(self, key):


again, should be a property

tomato42 · 2018-02-26T15:41:22Z

tlslite/utils/python_tripledes.py

+            iteration_adjustment = -1
+
+        i = 0
+        while i < 16:


for i in range(16):

tomato42 · 2018-02-26T15:42:40Z

tlslite/utils/python_tripledes.py

+        # Error check the data
+        if not data:
+            return ''
+        if len(data) % self.block_size != 0:


!= 0 is redundant, all non zero values are considered True

tomato42 · 2018-02-26T15:42:51Z

tlslite/utils/python_tripledes.py

+            return ''
+        if len(data) % self.block_size != 0:
+            if crypt_type == Des.DECRYPT:  # Decryption work on 8 byte blocks
+                raise ValueError("Invalid data length, data must be \


newlines in error message

tomato42 · 2018-02-26T15:43:07Z

tlslite/utils/python_tripledes.py

+                raise ValueError("Invalid data length, data must be \
+                                 a multiple of " + str(self.block_size) + " \
+                                 bytes\n.")
+            # print "Len of data: %f" % (len(data) / self.block_size)


leftover debug message

tomato42 · 2018-02-26T15:43:31Z

tlslite/utils/python_tripledes.py

+            result.append(self.__BitList_to_String(processed_block))
+            i += 8
+
+        # print "Lines: %d, cached: %d" % (lines, cached)


leftover debug message

tomato42

i've noted few issues with the test cases but I didn't put comments in all the places those issues are present, none the less, please fix all of them

tomato42 · 2018-02-27T15:16:47Z

unit_tests/test_tlslite_utils_tripledes.py

+
+        self.assertEqual(
+            self.tripleDes.decrypt(b'\x95\xf8\xa5\xe5\xdd\x31\xd9\x00'),
+                                   b'\x80\x00\x00\x00\x00\x00\x00\x00')


nit: incorrect indentation, b'\x80\x00\x00\x00\x00\x00\x00\x00' should be on the same level as self.tripleDes

self.assertEqual( triple_des.decrypt(b'\x95\xf8\xa5\xe5\xdd\x31\xd9\x00'), b'\x80\x00\x00\x00\x00\x00\x00\x00')

According to "test_tlslite_utils_rsakey.py", is this really correct?

tomato42 · 2018-02-27T15:17:24Z

unit_tests/test_tlslite_utils_tripledes.py

+                        b'\x01\x01\x01\x01\x01\x01\x01\x01')
+        IV = b'\x00\x00\x00\x00\x00\x00\x00\x00'
+
+        self.tripleDes = Python_TripleDES(key, IV)


why self.trpleDes? why not just triple_des?

tomato42 · 2018-02-27T15:17:41Z

unit_tests/test_tlslite_utils_tripledes.py

+    def test_3des_vartext_decrypt(self):
+        #Variable Plaintext Known Answer Test, decrypt one block
+
+        key = bytearray(b'\x01\x01\x01\x01\x01\x01\x01\x01' +


nit: redundant '+'

tomato42 · 2018-02-27T15:17:52Z

unit_tests/test_tlslite_utils_tripledes.py

+    # work with one block messages, all in KO3
+
+    #def setUp(self, key, IV):
+    #    self.tripleDes = Python_TripleDES(key, IV)


leftover debug code

tomato42 · 2018-02-27T15:19:11Z

unit_tests/test_tlslite_utils_tripledes.py

+
+        self.assertEqual(
+            self.tripleDes.decrypt(b'\x69\x0f\x5b\x0d\x9a\x26\x93\x9b'),
+                                   b'\x01\xa1\xd6\xd0\x39\x77\x67\x42')


nit: incorrect indentation

tomato42 · 2018-02-27T15:19:44Z

unit_tests/test_tlslite_utils_tripledes.py

+                          b'\x80\x00\x00\x00\x00\x00\x00\x00'))
+
+"""    
+class Test3DES_components(unittest.TestCase):


commented out code

tomato42 · 2018-02-27T15:24:08Z

tlslite/utils/python_tripledes.py

+
+    def __string_to_bitlist(self, data):
+        """Turn the string data, into a list of bits (1, 0)'s"""
+        if PY_VER < 3:


this need to compare to a tuple, not int:

if PY_VER < (3, ):

tomato42 · 2018-02-28T14:15:38Z

tlslite/utils/cipherfactory.py

@@ -31,31 +32,31 @@
 # Factory Functions for AES
 # **************************************************************************

-def createAES(key, IV, implList=None):
+def createAES(key, iv, imp_list=None):


this changes API in existing code, please don't do it (if you really want to fix it, use @deprecated_params, example: 1e4c092 in #218, and do it in a separate PR)

tomato42

also please squash the addition of 3des implementation and the test vectors together

tomato42 · 2018-02-28T14:16:59Z

tlslite/utils/python_tripledes.py

+
+        # Sanity checking of arguments.
+        if iv and len(iv) != self.block_size:
+            raise ValueError("Invalid Initial Value (iv), must be a "


s/Initial Value/Initialization vector/

tomato42 · 2018-02-28T14:17:40Z

tlslite/utils/python_tripledes.py

+
+    @iv.setter
+    def iv(self, iv):
+        # Set the Initial Value


Initialization Vector

tomato42 · 2018-02-28T14:17:48Z

tlslite/utils/python_tripledes.py

+    def iv(self, iv):
+        # Set the Initial Value
+        if not iv or len(iv) != self.block_size:
+            raise ValueError("Invalid Initial Value (iv), must be a "


tomato42 · 2018-02-28T14:19:48Z

tlslite/utils/python_tripledes.py

+    def _guard_against_unicode(self, data):
+        # Only accept byte strings or ascii unicode values, otherwise
+        # there is no way to correctly decode the data into bytes.
+        if PY_VER < (3, ):


either if PY_VER < (3, ) or PY_VER = (sys.version_info[0], ) (line 33) both at the same time won't work

tomato42 · 2018-02-28T14:27:59Z

tlslite/utils/python_tripledes.py

+                raise ValueError("Can only work with bytes, "
+                                 "not Unicode strings.")
+        else:
+            if isinstance(data, str):


in python 3 only bytes, bytearray or memoryview objects of them should ever be passed in so I think a DeprecationWarning here is a good idea (if we're as serious about testing inputs as this whole method indicates)

see 042c729 for example of use of warnings.warn (though here it may need to be stacklevel=1, not 2, please verify, we want error to list the file that called the function that called _guard_against_unicode)

tomato42 · 2018-02-28T14:33:52Z

tlslite/utils/python_tripledes.py

+            self.__key3 = self.__key1
+        else:
+            self.__key3 = Des(key[16:], self._iv)
+        _baseDes.key = key


what's it doing here?

tomato42 · 2018-02-28T14:33:56Z

tlslite/utils/python_tripledes.py

+        _baseDes.__init__(self, iv)
+        self.set_key(key)
+
+    def set_key(self, key):


this should be a property

tomato42 · 2018-02-28T14:34:09Z

tlslite/utils/python_tripledes.py

+            Must be 8 bytes in length.
+    """
+    def __init__(self, key, iv=None):
+        _baseDes.__init__(self, iv)


please use super()

tomato42 · 2018-02-28T14:35:07Z

tlslite/utils/python_tripledes.py

+
+    # Override setter methods to work on all 3 keys.
+
+    def setiv(self, iv):


this should be a property

tomato42 · 2018-02-28T14:38:01Z

unit_tests/test_tlslite_utils_tripledes.py

+                bytearray(b'\x80\x00\x00\x00\x00\x00\x00\x00'
+                          b'\x80\x00\x00\x00\x00\x00\x00\x00'
+                          b'\x80\x00\x00\x00\x00\x00\x00\x00')),
+                bytearray(b'\xa1\x55\xa6\xba\x61\xcf\xda\x01'


nit: incorrect indentation

tomato42 · 2018-02-28T14:49:57Z

also, while squashing, please rebase on top of current master

tomato42 · 2018-03-09T12:59:12Z

Please, don't use "update branch", it's actively harmful for the workflow we're using. Please rebase.

tomato42

Please, focus first on making sure the test cases pass, both on python 2 and python 3. Only after that baseline is established work on refactoring the code.

tomato42 · 2018-03-12T15:42:52Z

tlslite/utils/python_tripledes.py

+        if PY_VER < (3, ):
+            # Turn the strings into integers. Python 3 uses a bytes
+            # class, which already has this behaviour.
+            data = [ord(c) for c in data if isinstance(c, str)]


that doesn't look correct, it won't work if data is a bytearray

tomato42 · 2018-03-23T11:53:14Z

tests/tlstest.py


-        test_no += 1
+        #test_no += 1


I've commented it out for testing, not so that we commit it...

That code should either be removed or modified to use some other IMAP service, definitely not commented out

tomato42 · 2018-03-23T11:55:54Z

tlslite/utils/cipherfactory.py


 from tlslite.utils import cryptomath

-tripleDESPresent = False
+tripleDESPresent = True


comment explaining why it's present would likely be a good idea – backwards compatibility and so on

also, the later re-sets to True probably should be removed

tomato42 · 2018-03-23T11:56:14Z

tlslite/utils/cipherfactory.py

@@ -118,7 +119,7 @@ def createRC4(key, IV, implList=None):
    raise NotImplementedError()

 #Create a new TripleDES instance
-def createTripleDES(key, IV, implList=None):
+def createTripleDES(key, IV=None, implList=None):


why changed to IV=None?

tomato42 · 2018-03-23T11:56:58Z

tlslite/utils/python_tripledes.py

+
+# PY_VER is used to handle Python2 and Python3 differences.
+PY_VER = sys.version_info
+FLAG = 1


tomato42 · 2018-03-23T11:58:15Z

tlslite/utils/python_tripledes.py

+
+        # Sanity checking of arguments.
+        if not iv:
+            raise ValueError("Initialization Vector (iv) must be supplied")


if iv must be supplied, why a). it's initialised to None, b). why that check is performed in 3 places?

tomato42 · 2018-03-23T12:31:10Z

unit_tests/test_tlslite_utils_tripledes.py

+                          b'\x7c\xa1\x10\x45\x4a\x1a\x6e\x57'),
+                b'\x55\xfe\x07\x2a\x73\x51\xa5')
+
+    def test_bad_key_size(self):


same here as with the IV above

tomato42 · 2018-03-23T12:32:05Z

unit_tests/test_tlslite_utils_tripledes.py

+        with self.assertRaises(ValueError):
+            Python_TripleDES(key, iv).decrypt(u'aáäbcčdďeéfghiíjklĺľmnňo')
+
+    def test_1des_bad_key(self):


again, why bad?

tomato42 · 2018-03-23T12:32:48Z

unit_tests/test_tlslite_utils_tripledes.py

+                        b'\x7c\xa1\x10\x45\x4a\x1a\x6e\x57')
+        iv = b'\x55\xfe\x07\x2a\x73\x51\xa5\xc8'
+
+        Python_TripleDES(key, iv).encrypt()


assert missing

tomato42 · 2018-03-23T12:33:18Z

unit_tests/test_tlslite_utils_tripledes.py

+                        b'\x7c\xa1\x10\x45\x4a\x1a\x6e\x57')
+        iv = b'\x55\xfe\x07\x2a\x73\x51\xa5\xc8'
+
+        Python_TripleDES(key, iv).decrypt()


assert missing

tomato42 · 2018-03-23T12:34:38Z

unit_tests/test_tlslite_utils_tripledes.py

+            Python_TripleDES(key, iv).encrypt('161514131211109876543')
+
+        with self.assertRaises(ValueError):
+            Python_TripleDES(key, iv).decrypt('161514131211109876543')


this should be a separate test case, raising an exception generally is considered to leave the object in undefined state, so reusing the object for the test case may hide some behaviour

tomato42 · 2018-03-26T12:58:54Z

tests/tlstest.py

@@ -790,12 +790,6 @@ def connect():

    print("Test {0} - Internet servers test".format(test_no))
    try:
-        i = IMAP4_TLS("cyrus.andrew.cmu.edu")


I said "in a separate patch", but that I mean, it needs to be the only change in that path and the message of that patch needs to explain why that change is happening

tomato42 · 2018-03-26T13:08:14Z

tlslite/utils/cipherfactory.py


 from tlslite.utils import cryptomath

-tripleDESPresent = False
+tripleDESPresent = True
+# 3DES cipher usage for backwards compatibility with older openSSL versions


doc strings of variables/constants need to be strings (""")

what older versions of OpenSSL?

tomato42 · 2018-03-26T13:10:00Z

tlslite/utils/python_tripledes.py

+
+        # Sanity checking of arguments.
+        if not iv:
+            raise ValueError("Initialization Vector (iv) must be supplied")


the check is still being performed in 3 places: 45, 50 and 52

tomato42 · 2018-03-26T13:12:34Z

tlslite/utils/python_tripledes.py

-    @property
-    def iv(self):
-        # return bytes
+    def get_iv(self):


did I say "change it back to a getter"?

tomato42 · 2018-03-26T13:18:23Z

tlslite/utils/python_tripledes.py

@@ -280,53 +271,52 @@ def __permutate(self, table, block):
        """Permutate this block with the specified table"""
        return [block[x] for x in table]

-    # Transform the secret key, so that it is ready for data processing
-    # Create the 16 subkeys, k[1] - k[16]
+    """Transform the secret key, so that it is ready for data processing"""


that's not a valid doc string

tomato42 · 2018-03-26T13:23:51Z

unit_tests/test_tlslite_utils_tripledes.py

        with self.assertRaises(ValueError):
            Python_TripleDES(b'\x7c\xa1\x10\x45\x4a\x1a\x6e\x57',
                             b'\x55\xfe\x07\x2a\x73\x51\xa5\x00')
+    if PY_VER > (3, ):


the canonical way is to use @unittest.skipIf() decorator: https://docs.python.org/2/library/unittest.html#skipping-tests-and-expected-failures

tomato42 · 2018-03-26T13:31:44Z

unit_tests/test_tlslite_utils_tripledes.py

        with self.assertRaises(ValueError):
            Python_TripleDES(b'\x7c\xa1\x10\x45\x4a\x1a\x6e\x57',
                             b'\x55\xfe\x07\x2a\x73\x51\xa5\x00')
+    if PY_VER > (3, ):
+        # DeprecationWarning check should apply only on python3


we also need to verify that on Python2 no warnings were emitted (example code that needs to be modified to assert that there were 0 warnings)

tomato42 · 2018-03-26T13:38:45Z

tlslite/utils/python_tripledes.py

+PY_VER = sys.version_info
+
+
+def new(key, iv):


it seems to me like this is still missing test coverage

tomato42 · 2018-04-09T12:43:49Z

please fix that python 3.2 issue

tomato42

cipherfactory.py:142 is not covered

seems to be an issue with test cases for recordlayer:
https://github.com/tomato42/tlslite-ng/blob/6498e79f43b6c1ff9ffc0e93f3d781aebdf993bd/unit_tests/test_tlslite_recordlayer.py#L441-L442

and

https://github.com/tomato42/tlslite-ng/blob/6498e79f43b6c1ff9ffc0e93f3d781aebdf993bd/unit_tests/test_tlslite_recordlayer.py#L1388-L1391

please fix

tomato42 · 2018-04-17T14:24:34Z

tlslite/utils/python_tripledes.py

+                warnings.warn("Only bytes, bytearray or memoryview "
+                              "objects of them should be passed",
+                              DeprecationWarning,
+                              stacklevel=1)


given that this emits errors like this:

/home/travis/build/tomato42/tlslite-ng/tlslite/utils/python_tripledes.py:74: DeprecationWarning: Only bytes, bytearray or memoryview objects of them should be passed stacklevel=1)

1 here is not correct, will likely need 3 – we want the error to be emitted from user code, not this module's code

tomato42 · 2018-04-17T14:29:57Z

unit_tests/test_tlslite_utils_tripledes.py

+
+    @unittest.skipIf(PY_VER < (3, ), "Unicode string syntax on py2: u'ľáľä'")
+    def test1_py3_unicode_instance(self):
+        with self.assertRaises(ValueError):


this should also assert a warning (so two with, one inside the other) otherwise it pollutes the output of unittest run

tomato42 · 2018-04-17T14:31:49Z

unit_tests/test_tlslite_utils_tripledes.py

+        key =  b"\xaa"*24
+        iv = b"\xbb"*8
+
+        with self.assertRaises(ValueError):


same here, assert for warning missing, but this assert for exception should stay

tomato42 · 2018-04-17T14:32:37Z

unit_tests/test_tlslite_utils_tripledes.py

+        key =  b"\xaa"*24
+        iv = b"\xbb"*8
+
+        with self.assertRaises(ValueError):


same here, assert for warning missing

tomato42 · 2018-04-17T14:33:38Z

unit_tests/test_tlslite_utils_tripledes.py

+        iv = b'\x55\xfe\x07\x2a\x73\x51\xa5\xc8'
+
+        with self.assertRaises(ValueError):
+            Python_TripleDES(key, iv).decrypt('161514131211109876543')


shouldn't this be b'1615...?

tomato42 · 2018-04-17T14:33:56Z

unit_tests/test_tlslite_utils_tripledes.py

+        iv = b'\x55\xfe\x07\x2a\x73\x51\xa5\xc8'
+
+        with self.assertRaises(ValueError):
+            Python_TripleDES(key, iv).encrypt('161514131211109876543')


shouldn't this be b'161514...?

tomato42 · 2018-04-17T14:36:29Z

unit_tests/test_tlslite_utils_tripledes.py

+
+    @unittest.skipIf(PY_VER < (3, ), "Unicode string syntax on py2: u'ľáľä'")
+    def test2_py3_unicode_instance(self):
+        with self.assertRaises(ValueError):


assert for warning missing

tomato42 · 2018-04-17T14:42:45Z

tlslite/utils/python_tripledes.py

+    Supports CBC (Cypher Block Chaining) mode.
+    """
+    def __init__(self, key, iv=None):
+        super(Python_TripleDES, self).__init__(iv)


so the problem with this is that if we fix the stacklevel to 3 in warn, it will report this line as the problematic one

we can fix it in two ways, either change the _guard_against_unicode() to detect this case, or call _guard_against_unicode() on iv from here, before calling super(), the latter is likely easier to do

tomato42 · 2018-04-20T13:39:17Z

Reviewed 2 of 5 files at r12, 2 of 2 files at r13.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

Comments from Reviewable

tomato42 · 2018-04-20T13:48:06Z

@avargaRH thank you!

avargaRH force-pushed the 3DESimplementation branch 6 times, most recently from 5cf7313 to d7d7b1d Compare February 1, 2018 16:13

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python_tripledes and test_tlslite_utils_tripledes added, updated

da9336a

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tomato42 merged commit 403539b into tlsfuzzer:master Apr 20, 2018

tomato42 mentioned this pull request Apr 20, 2018

Implement 3DES cipher in pure Python #93

Closed


		# Override setter methods to work on all 3 keys.

		def setiv(self, iv):

3DES implementation #202

3DES implementation #202

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avargaRH commented Jan 22, 2018 • edited by tomato42 Loading

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avargaRH Feb 28, 2018 • edited Loading

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tomato42 commented Feb 28, 2018

tomato42 commented Mar 9, 2018

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tomato42 commented Apr 9, 2018

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tomato42 commented Apr 20, 2018

tomato42 commented Apr 20, 2018

avargaRH commented Jan 22, 2018 •

edited by tomato42

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avargaRH Feb 28, 2018 •

edited

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