Cipher/DES3.py

   1 import blockcipher
   2 import Crypto.Cipher.DES3
   3
   4 MODE_ECB = 1
   5 MODE_CBC = 2
   6 MODE_CFB = 3
   7 MODE_OFB = 5
   8 MODE_CTR = 6
   9
  10 def new(key,mode=blockcipher.MODE_ECB,IV=None):
  11         return DES3(key,mode,IV)
  12
  13 class DES3(blockcipher.BlockCipher):
  14         #need test vectors
  15         """DES using pycrypto for algo en pycryptoplus for ciphermode
  16
  17         EXAMPLE (using test vectors from http://csrc.nist.gov/groups/STM/cavp/documents/des/DESMMT.pdf):
  18         >>> import DES3
  19         >>> from binascii import hexlify, unhexlify
  20         >>> key = unhexlify('37ae5ebf46dff2dc0754b94f31cbb3855e7fd36dc870bfae')
  21         >>> IV = unhexlify('3d1de3cc132e3b65')
  22         >>> cipher = DES3.new(key, DES3.MODE_CBC, IV)
  23         >>> ciphertext = cipher.encrypt(unhexlify('84401f78fe6c10876d8ea23094ea5309'))
  24         >>> hexlify(ciphertext)
  25         '7b1f7c7e3b1c948ebd04a75ffba7d2f5'
  26         >>> decipher = DES3.new(key, DES3.MODE_CBC, IV)
  27         >>> plaintext = decipher.decrypt(ciphertext)
  28         >>> hexlify(plaintext)
  29         '84401f78fe6c10876d8ea23094ea5309'
  30         """
  31         def __init__(self,key,mode,IV):
  32                 self.cipher = Crypto.Cipher.DES3.new(key)
  33                 self.blocksize = Crypto.Cipher.DES3.block_size
  34                 blockcipher.BlockCipher.__init__(self,key,mode,IV)
  35
  36 def _test():
  37         import doctest
  38         doctest.testmod()
  39
  40 if __name__ == "__main__":
  41         _test()