src/CryptoPlus/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         key = raw string containing the keys
  10         mode = python_AES.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB
  11         IV = IV as a raw string, default is "all zero" IV
  12             -> only needed for CBC mode
  13         counter = counter object (CryptoPlus.Util.util.Counter)
  14             -> only needed for CTR mode
  15
  16     EXAMPLES:
  17     **********
  18     IMPORTING:
  19     -----------
  20     >>> from CryptoPlus.Cipher import DES
  21
  22     EXAMPLE (test vectors from NESSIE):
  23     -----------------------------------
  24
  25     >>> cipher = DES.new(('7CA110454A1A6E57').decode('hex'))
  26     >>> ciphertext = cipher.encrypt(('01A1D6D039776742').decode('hex'))
  27     >>> (ciphertext).encode('hex')
  28     '690f5b0d9a26939b'
  29     >>> plaintext = cipher.decrypt(ciphertext)
  30     >>> (plaintext).encode('hex')
  31     '01a1d6d039776742'
  32
  33     """
  34     return DES(key,mode,IV,counter)
  35
  36 class DES(BlockCipher):
  37     def __init__(self,key,mode,IV,counter):
  38         cipher_module = Crypto.Cipher.DES.new
  39         self.blocksize = 8
  40         BlockCipher.__init__(self,key,mode,IV,counter,cipher_module)
  41
  42 def _test():
  43     import doctest
  44     doctest.testmod()
  45
  46 if __name__ == "__main__":
  47     _test()