src/Cipher/DES.py

   1 from blockcipher import *
   2 import Crypto.Cipher.DES
   3
   4 def new(key,mode=MODE_ECB,IV=None,counter=None):
   5     """Create a new cipher object
   6
   7     DES using pycrypto for algo and pycryptoplus for ciphermode
   8
   9     new(key,mode=MODE_ECB,IV=None,counter=None):
  10         key = raw string containing the keys
  11         mode = python_AES.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB
  12         IV = IV as a raw string
  13             -> only needed for CBC mode
  14         counter = counter object (CryptoPlus.Util.util.Counter)
  15             -> only needed for CTR mode
  16
  17     EXAMPLE (test vectors from NESSIE):
  18     -----------------------------------
  19     >>> import DES
  20     >>> from binascii import hexlify, unhexlify
  21     >>> cipher = DES.new(unhexlify('7CA110454A1A6E57'))
  22     >>> ciphertext = cipher.encrypt(unhexlify('01A1D6D039776742'))
  23     >>> hexlify(ciphertext)
  24     '690f5b0d9a26939b'
  25     >>> plaintext = cipher.decrypt(ciphertext)
  26     >>> hexlify(plaintext)
  27     '01a1d6d039776742'
  28
  29     """
  30     return DES(key,mode,IV,counter)
  31
  32 class DES(BlockCipher):
  33     def __init__(self,key,mode,IV,counter):
  34         self.cipher = Crypto.Cipher.DES.new(key)
  35         self.blocksize = Crypto.Cipher.DES.block_size
  36         BlockCipher.__init__(self,key,mode,IV,counter)
  37
  38 def _test():
  39     import doctest
  40     doctest.testmod()
  41
  42 if __name__ == "__main__":
  43     _test()