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A pure python module which implements the DES and Triple-DES encryption algorithms.

License: MIT License

Python 80.93% HTML 16.74% CSS 2.34%

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About unpad data function question

In code line 221:

elif padmode == PAD_PKCS5:
	if _pythonMajorVersion < 3:
		pad_len = ord(data[-1])
	else:
		pad_len = data[-1]
	data = data[:-pad_len]

If decrypt data end bytes is 0x00->0, The code data = data[:-pad_len] gave me empty data.
Sorry for my bad English.

Pydes Error generating triple des conversion

Error: ord() expected string of length 1, but int found
I have found solution for this some changing in pyDes.py

Please change in pyDes.py file on line number 418:

if _pythonMajorVersion < 3 :

if _pythonMajorVersion < 3 and isinstance(data[0], str):

Different implementations

May I ask what is the difference between pyDes.py and pyDes_152_compat.py?

Invalid data length, data must be a multiple of 8 bytes

I stated pad char but still got error:
Invalid data length, data must be a multiple of 8 bytes
As I understood - in such cases data length should be increased by X number of pad chars to match block size.
Or I'm doing something wrong?

secKey = [55, 22, 5, 23, 11, 34, 48, 58]
decoder = pyDes.des(bytearray(secKey), pyDes.ECB, pad=b'\0')

decoded_data = decoder.decrypt(tcp_data)

Cannot collect pydes

Is pydes configured in pypi properly? I'm failing to fetch the package. It seems some urls were changed in e988a5f but I don't see those reflected in pypi

Looking in indexes: https://pypi.lyft.net/pypi/, https://pypi.python.org/simple/
Collecting nfcpy==1.0.3
  Using cached nfcpy-1.0.3-py3-none-any.whl (186 kB)
Collecting libusb1
  Using cached libusb1-1.9.2-py3-none-any.whl (58 kB)
Collecting pydes
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105879fa0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865130>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x1058652b0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865430>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x1058655b0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
ERROR: Could not install packages due to an EnvironmentError: HTTPConnectionPool(host='whitemans.ca', port=80): Max retries exceeded with url: /pyDES/pyDes-2.0.1.zip (Caused by ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865730>, 'Connection to whitemans.ca timed out. (connect timeout=15)'))

WARNING: You are using pip version 20.2.3; however, version 21.1 is available.
You should consider upgrading via the '/Users/conormurphy/.pyenv/versions/3.9.0/envs/triangle-tool-3.9.0/bin/python3.9 -m pip install --upgrade pip' command.

Can you help me implement such type of C# code with pyDes?

Canonical "latest" version

Hi, this is packaged on NixOS, as well as some other distros: https://repology.org/project/python:pydes/versions

It seems the NixOS version is flagged because the package is based on this repository, rather than the pypi package.

Which version should be considered the canonical "latest"? The commits since 2.0.1 seem ok to me personally, is this just a case of not having time to sort out a new pypi release?

Do not support "Padding:PKCS7",Please

can't import pyDes

After installing pyDes by pip install pyDes when i am tying to import pyDes its showing some error.

why des and triple_des the key is different

CBC mode adds extra bytes

Thanks for a great implementation of DES! However, I think I may have found an issue.

Describe your problem
When encrypting using the DES implementation in CBC mode, the resulting output have extra bytes at the end.

What did you expect?
An example of correct input -> output mapping

KEY = b'descrypt'
STR = b'linuslag'
c = des(KEY, CBC, b"\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
c.encrypt(STR * 2)
# b'2u\xdb\x12\xe5-#\x9e\xe7\x8b\x99\x85M\xcc\x9a\r'

What happened?
The actual output:

KEY = b'descrypt'
STR = b'linuslag'
c = des(KEY, CBC, b"\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)
c.encrypt(STR * 2)
# b'2u\xdb\x12\xe5-#\x9e\xe7\x8b\x99\x85M\xcc\x9a\r\x93\xf4w{m7#e'

As can be seen from these examples, the actual output is the same as the expected output except it has some extra 8 bytes at the end.

(Can be validated using online tools, such as: http://extranet.cryptomathic.com/descalc/index)

Create encrypted passwords for VNC?

The tool vncpassword.py includes d3des.py, a Python implementation of 3DES with modifications to the original 3DES algorithm. The main modification seems to be:

# This is a departure from the original code.
#bytebit = [ 0200, 0100, 040, 020, 010, 04, 02, 01 ] # original
bytebit = [ 01, 02, 04, 010, 020, 040, 0100, 0200 ] # VNC version

I have no clue what that means, and I wonder: Can I use pyDes to create 3DES encrypted passwords for VNC?

Results of my tests:

$ echo SomeData | tightvncpasswd -f | xxd
0000000: 960d e668 b0d9 dd3c
$ python3 -c "import sys; import pyDes; \
des = pyDes.des([23, 82, 107, 6, 35, 78, 88, 7]); \
sys.stdout.buffer.write(des.encrypt('SomeData'))" | xxd
0000000: cd32 65aa 048d 5688                      .2e...V.
$ python3 -c "import sys; import pyDes; \
des = pyDes.triple_des([23, 82, 107, 6, 35, 78, 88, 7, 0, 0, 0, 0, 0, 0, 0, 0]); \
sys.stdout.buffer.write(des.encrypt('SomeData'))" | xxd
0000000: 23c8 ea0c bef9 ad8d                      #.......
$ python3 -c "import sys; import pyDes; \
des = pyDes.triple_des([23, 82, 107, 6, 35, 78, 88, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]); \
sys.stdout.buffer.write(des.encrypt('SomeData'))" | xxd
0000000: cd32 65aa 048d 5688                      .2e...V.

The encryption key used by VNC is [23, 82, 107, 6, 35, 78, 88, 7]. This is the same for TightVNC, TigerVNC, and RealVNC. Unfortunately, as you can see, with the above command lines, I'm not able to reproduce the output of the VNC password command.

TypeError: unsupported operand type(s) for +=: 'dict' and 'bytes'

In a very simple test under python 3.7.4 i got the following error:

accesskey16 = '375bf8eda8d14185'
dataStr = b"testdata"
keying = pyDes.triple_des(
  accesskey16.encode(),
  pyDes.ECB, 
  b"\0\0\0\0\0\0\0\0", 
  pad=None,
  padmode=pyDes.PAD_PKCS5)
encStr = keying.encrypt(data)

TypeError: unsupported operand type(s) for +=: 'dict' and 'bytes', I have checked the code and couldn't figure out the issue

Cannot collect pydes

Is pydes configured in pypi properly? I'm failing to fetch the package. It seems some urls were changed in e988a5f but I don't see those reflected in pypi

Looking in indexes: https://pypi.lyft.net/pypi/, https://pypi.python.org/simple/
Collecting nfcpy==1.0.3
  Using cached nfcpy-1.0.3-py3-none-any.whl (186 kB)
Collecting libusb1
  Using cached libusb1-1.9.2-py3-none-any.whl (58 kB)
Collecting pydes
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105879fa0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865130>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x1058652b0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865430>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x1058655b0>, 'Connection to whitemans.ca timed out. (connect timeout=15)')': /pyDES/pyDes-2.0.1.zip
ERROR: Could not install packages due to an EnvironmentError: HTTPConnectionPool(host='whitemans.ca', port=80): Max retries exceeded with url: /pyDES/pyDes-2.0.1.zip (Caused by ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPConnection object at 0x105865730>, 'Connection to whitemans.ca timed out. (connect timeout=15)'))

WARNING: You are using pip version 20.2.3; however, version 21.1 is available.
You should consider upgrading via the '/Users/conormurphy/.pyenv/versions/3.9.0/envs/triangle-tool-3.9.0/bin/python3.9 -m pip install --upgrade pip' command.

Upgrading to pip 21.1 works fine, but I have a bazel repo pinned to an earlier version and it cannot collect this package.

ValueError: pyDes can only work with encoded strings, not Unicode.

text = r'一对一异或操作，得到结果,其中,"ord(char)"得到该字符对应的ASCII码,"chr(int)"刚好相反'
cipher_text = Des2.des_encrypt(text)
print(cipher_text)
text = Des2.des_descrypt(cipher_text)
print(text)

Traceback (most recent call last):
cipher_text = Des2.des_encrypt(text)
File "/Des2.py", line 19, in des_encrypt
en = k.encrypt(s, padmode=PAD_PKCS5)
File "/usr/local/lib/python3.7/site-packages/pyDes.py", line 655, in encrypt
data = self._guardAgainstUnicode(data)
File "/usr/local/lib/python3.7/site-packages/pyDes.py", line 241, in _guardAgainstUnicode
raise ValueError("pyDes can only work with encoded strings, not Unicode.")
ValueError: pyDes can only work with encoded strings, not Unicode.

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