xtea 0.7.1

A python version of XTEA

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 xtea 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

Resources

• PyPi: https://pypi.org/project/xtea

• Docs: http://xtea.readthedocs.io/

• Source code: https://github.com/varbin/xtea

• Issue tracker: https://github.com/varbin/xtea/issues

Changelog

Version 0.7.1, former 0.6.1 / 0.7.0; Jun 16, 2018

• Improved tests

• PEP8-style formatting

• Unittests: Counter, modes (but not results of them!), test vectors

• [BREAKING CHANGE] Counter class is now in xtea.counter

• Python 3.3 is not tested anymore on Travis CI

• [BREAKING CHANGE] CFB mode is now correctly implemented. By setting partition_size it is possible to set the internal partition size (in bits) as per PEP-272.

• Python 3: An optional C extension improves speed upto a factor of 10.

• [BREAKING CHANGE] block_size and key_size is now in bytes.

• Skipped 0.7.0 with

(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)

(unreleased) Version 0.2.1 - dev; Jul 10, 2014

• 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

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

Version 0.1.1; Jul 9, 2014

• Module raises a NotImplementedError on CFB

• Minor changes

Version 0.1; Jun 22, 2014

• Initial release

• Supports all mode except CFB

• Buggy CTR ( “ß” = “\xc3\x9f” )

• Working with PEP 272, default mode is ECB