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

It also supports CBC-MAC.

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

I does NOT guarantee that this implementation (or the base cipher) is secure. If there are bugs, tell me them please.

Version 0.4.0; Jul 12, 2014

[0.4.0] Buggless & PEP compliant CTR | added CBCMAC

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

[0.3.2] Minor Fixes

[0.3.1] Minor Fixes

• Fixed that the length of data will not be checked

[0.3.0] Added CFB mode

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

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)

[0.2.0] Added a test feature; warning in CTR

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

[0.1.1] NotImplementedError on CFB

• Module raises a NotImplementedError on CFB
• Minor changes

[0.1] Initial release

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