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DES.py
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52 lines (42 loc) · 1.68 KB
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from __future__ import absolute_import
from .blockcipher import *
import Crypto.Cipher.DES
def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None):
"""Create a new cipher object
DES using pycrypto for algo and pycryptoplus for ciphermode
key = raw string containing the keys
mode = python_AES.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB
IV = IV as a raw string, default is "all zero" IV
-> only needed for CBC mode
counter = counter object (CryptoPlus.Util.util.Counter)
-> only needed for CTR mode
segment_size = amount of bits to use from the keystream in each chain part
-> supported values: multiple of 8 between 8 and the blocksize
of the cipher (only per byte access possible), default is 8
-> only needed for CFB mode
EXAMPLES:
**********
IMPORTING:
-----------
>>> from CryptoPlus.Cipher import DES
EXAMPLE (test vectors from NESSIE):
-----------------------------------
>>> cipher = DES.new(('7CA110454A1A6E57').decode('hex'))
>>> ciphertext = cipher.encrypt(('01A1D6D039776742').decode('hex'))
>>> (ciphertext).encode('hex')
'690f5b0d9a26939b'
>>> plaintext = cipher.decrypt(ciphertext)
>>> (plaintext).encode('hex')
'01a1d6d039776742'
"""
return DES(key,mode,IV,counter,segment_size)
class DES(BlockCipher):
def __init__(self,key,mode,IV,counter,segment_size):
cipher_module = Crypto.Cipher.DES.new
self.blocksize = 8
BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size)
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()