src/CryptoPlus/Cipher/CAST.py

   1 from blockcipher import *
   2 import Crypto.Cipher.CAST
   3
   4 def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=8):
   5     """Create a new cipher object
   6
   7     CAST 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 CAST
  21
  22     ECB example: http://www.rfc-editor.org/rfc/rfc2144.txt
  23     -------------
  24     128 bit key
  25
  26     >>> key = "0123456712345678234567893456789A".decode('hex')
  27     >>> plaintext = "0123456789ABCDEF".decode('hex')
  28     >>> cipher = CAST.new(key,CAST.MODE_ECB,)
  29     >>> cipher.encrypt(plaintext).encode('hex')
  30     '238b4fe5847e44b2'
  31
  32     40 bit key
  33     >>> from CryptoPlus.Cipher import CAST
  34     >>> key = "0123456712".decode('hex')
  35     >>> plaintext = "0123456789ABCDEF".decode('hex')
  36     >>> cipher = CAST.new(key,CAST.MODE_ECB,)
  37     >>> cipher.encrypt(plaintext).encode('hex').upper()
  38     '7AC816D16E9B302E'
  39     """
  40     return CAST(key,mode,IV,counter,segment_size)
  41
  42 class CAST(BlockCipher):
  43     def __init__(self,key,mode,IV,counter,segment_size):
  44         cipher_module = Crypto.Cipher.CAST.new
  45         self.blocksize = 8
  46         BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size)
  47
  48 def _test():
  49     import doctest
  50     doctest.testmod()
  51
  52 if __name__ == "__main__":
  53     _test()