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A python version of XTEA

Project description

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This is an XTEA-Cipher implementation in Python (eXtended Tiny Encryption Algorithm).

XTEA is a blockcipher with 8 bytes blocksize and 16 bytes Keysize (128-Bit). The algorithm is secure at 2014 with the recommend 64 rounds (32 cycles). This implementation supports following modes of operation: ECB, CBC, CFB, OFB, CTR

Example:

>>> from xtea4 import *
>>> key = " "*16  # Never use this
>>> text = "This is a text. "*8
>>> x = new(key, mode=MODE_OFB, IV="12345678")
>>> c = x.encrypt(text)
>>> text == x.decrypt(c)
True

Note

I do NOT guarantee that this implementation (or the base cipher) is secure. If you find bugs, please report them at https://github.com/tgates42/xtea/issues .

Changelog

(dev) Version 0.6.1; …

  • Improved tests
  • PEP8-style formatting
  • Unittests: Counter, modes (but not results of them!), test vectors
  • [BREAKING CHANGE] Counter class is now in xtea4.counter

(unreleased) Version 0.6.0; Oct 16, 2016

  • Python 3 does work now
  • [BREAKING CHANGE] counters cannot return numbers any more, they must return bytestrings now
  • [BREAKING CHANGE] Cipher objects remember state, so two consecutive calls to XTEACipher.encrypt should not return the same
  • improved documentation

(unreleased) Version 0.5.0; Oct 15, 2016

  • Removed CBCMAC

Version 0.4.1; Jul 30, 2015

  • Fixed installer

Version 0.4.0; Jul 12, 2014

  • Buggless & PEP compliant CTR
  • CTR mode works with strings now
  • raises DeprecatedWarning if a number is returned
  • CBCMAC class added (use static method CBCMAC.new(args) to create)

Version 0.3.2; Jul 11, 2014

  • Minor Fixes

Version 0.3.1; Jul 11, 2014

  • Minor Fixes
  • Fixed that the length of data will not be checked

Version 0.3.0; Jul 11, 2014

  • Added CFB mode
  • Fully working with PEP 272
  • Raising NotImplementedError only on PGP-CFB (OpenPGP) mode
  • Wheel support and changelog (0.2.1)

Version 0.2.1 - dev; Jul 10, 2014

Never released…

  • Added better wheel support for uploading (just for me) with a setup.cfg
  • Added this file (auto uploading on pypi/warehouse and github)
  • (upload.py for github)

Version 0.2.0; Jul 9, 2014

  • Added a test feature; warning in CTR
  • Added a test feature
  • Raises warning on CTR, added a handler that CTR will not crash anymore ;)

Version 0.1.1; Jul 9, 2014

[0.1.1] NotImplementedError on CFB

  • Module raises a NotImplementedError on CFB
  • Minor changes

Version 0.1; Jun 22, 2014

[0.1] Initial release

  • Supports all mode except CFB
  • Buggy CTR ( “ß” = “\xc3\x9f” )
  • Working with PEP 272, default mode is ECB

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This version

0.6.1

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