PyCryptoPlus

From YobiWiki
Jump to navigation Jump to search

Back to SAGE & cryptology

Differences with pycrypto

  • ciphers from pycrypto are being used with the python chaining modes and not the original pycrypto ones
    => plaintext can be supplied in arbitrary sizes instead of multiples of the blocksize like in pycrypto: the new chaining modes keep a cache to encrypt/decrypt data once the cachesize holds at least a blocksize of data
  • new possibilities:
    • Serpent, Twofish
    • CMAC, XTS, CTR mod

TODO

  • add chaining modes: CMAC, CTR mod?
  • further importing of pycrypto
  • make test vectors available as variables
  • add tests:
    • CBC for serpent, twofish, blowfish
    • XTS is only tested by comparing deciphered ciphertext, not by checking ciphertext
  • check other implementation of Blowfish
  • final() method of chains
    • add a cipher.final() method? pycrypto doesn't have it, but it doesn't really conflict with the pycrypto API. It will just extend it
    • final() method should use padding. Choose padding function at initialization of the cipher => again: extending the API
  • XTS <-> XTS-AES?
    XTS-AES just denotes XTS using AES cipher? Make only that one available?
  • add rijndael instead of only AES

Licenses

  • used from python truecrypt implementation
    all original code is under MIT license (much freedom according to [1])
    • pyTwofish (untouched)
      python truecrypt author isn't the original author = > extra copyright notice that should be left in place
    • pyserpent (untouched)
      python truecrypt author isn't the original author = > extra copyright notice that should be left in place
    • XTS (modified)
      python truecrypt author is the original author => only MIT License
    • GF2n.py(untouched)
      python truecrypt author is the original author => only MIT License
  • pyblowfish (untouched)
    gpl or artistic license
    gpl is compatible with public domain
    Note from Phil: take care with GPL "viral" behavior, come&talk to me...
  • rijndael.py (untouched)
    using tls lite (public domain) implementation which uses code from Bram Cohen (public domain)
  • pyDes (untouched)
    public domain according to its homepage
  • blockciphers CBC, ECB, CTR from [2] (modified)
    keep copyright notice in place?

Info

Test Vectors

Chaining Modes