src/Cipher/IDEA.py

   1 from blockcipher import *
   2 try:
   3     import Crypto.Cipher.IDEA
   4 except ImportError:
   5     print "Crypto.Cipher.IDEA isn't available. You're probably using the Debian pycrypto version. Install the original pycrypto for IDEA."
   6     raise
   7
   8 def new(key,mode=MODE_ECB,IV=None,counter=None):
   9     """Create a new cipher object
  10
  11     IDEA using pycrypto for algo and pycryptoplus for ciphermode
  12
  13     new(key,mode=MODE_ECB,IV=None,counter=None):
  14         key = raw string containing the keys
  15         mode = python_AES.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB
  16         IV = IV as a raw string
  17             -> only needed for CBC mode
  18         counter = counter object (CryptoPlus.Util.util.Counter)
  19             -> only needed for CTR mode
  20
  21     https://www.cosic.esat.kuleuven.be/nessie/testvectors/
  22     -----------------------------------------
  23     >>> from CryptoPlus.Cipher import IDEA
  24     >>> key = "2BD6459F82C5B300952C49104881FF48".decode('hex')
  25     >>> plaintext = "F129A6601EF62A47".decode('hex')
  26     >>> cipher = IDEA.new(key,IDEA.MODE_ECB,)
  27     >>> cipher.encrypt(plaintext).encode('hex').upper()
  28     'EA024714AD5C4D84'
  29     """
  30     return IDEA(key,mode,IV,counter)
  31
  32 class IDEA(BlockCipher):
  33     def __init__(self,key,mode,IV,counter):
  34         self.cipher = Crypto.Cipher.IDEA.new(key)
  35         self.blocksize = Crypto.Cipher.IDEA.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()