src/CryptoPlus/Cipher/python_Blowfish.py

   1 from blockcipher import *
   2 from pyblowfish import Blowfish
   3
   4 def new(key,mode=MODE_ECB,IV=None,counter=None):
   5     """Create a new cipher object
   6
   7     Wrapper for pure python implementation pyblowfish.py
   8
   9         key = raw string containing the key
  10         mode = Blowfish.MODE_ECB/CBC/CFB/OFB/CTR/CMAC, default is ECB
  11         IV = IV as a raw string
  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 python_Blowfish
  21
  22     EXAMPLE: (http://www.schneier.com/code/vectors.txt)
  23     ----------
  24
  25     >>> cipher = python_Blowfish.new(('0131D9619DC1376E').decode('hex'))
  26     >>> ( cipher.encrypt(('5CD54CA83DEF57DA').decode('hex')) ).encode('hex')
  27     'b1b8cc0b250f09a0'
  28     >>> ( cipher.decrypt((_).decode('hex')) ).encode('hex')
  29     '5cd54ca83def57da'
  30
  31     CBC, CFB, OFB EXAMPLE: http://www.schneier.com/code/vectors.txt
  32     ----------------------
  33     >>> key = ('0123456789ABCDEFF0E1D2C3B4A59687').decode('hex')
  34     >>> IV = ('FEDCBA9876543210').decode('hex')
  35     >>> plaintext = ('37363534333231204E6F77206973207468652074696D6520').decode('hex')
  36     >>> cipher = python_Blowfish.new(key,python_Blowfish.MODE_CBC,IV)
  37     >>> ciphertext = cipher.encrypt(plaintext)
  38     >>> (ciphertext).encode('hex').upper()
  39     '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9'
  40
  41
  42     >>> key = '0123456789ABCDEFF0E1D2C3B4A59687'.decode('hex')
  43     >>> iv = 'FEDCBA9876543210'.decode('hex')
  44     >>> plaintext = '37363534333231204E6F77206973207468652074696D6520666F722000'.decode('hex')
  45
  46     >>> cipher = python_Blowfish.new(key,python_Blowfish.MODE_CBC,iv)
  47     >>> ciphertext = cipher.encrypt(plaintext)
  48     >>> (ciphertext).encode('hex').upper()
  49     '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9'
  50
  51     >>> cipher = python_Blowfish.new(key,python_Blowfish.MODE_CFB,iv)
  52     >>> ciphertext = cipher.encrypt(plaintext)
  53     >>> (ciphertext).encode('hex').upper()
  54     'E73214A2822139CAF26ECF6D2EB9E76E3DA3DE04D1517200519D57A6C3'
  55
  56     >>> cipher = python_Blowfish.new(key,python_Blowfish.MODE_OFB,iv)
  57     >>> ciphertext = cipher.encrypt(plaintext)
  58     >>> (ciphertext).encode('hex').upper()
  59     'E73214A2822139CA62B343CC5B65587310DD908D0C241B2263C2CF80DA'"""
  60     return python_Blowfish(key,mode,IV,counter)
  61
  62 class python_Blowfish(BlockCipher):
  63     key_error_message = "Key should be between 8 and 56 bytes (64 <-> 448 bits)"
  64
  65     def __init__(self,key,mode,IV,counter):
  66         cipher_module = Blowfish
  67         self.blocksize = 8
  68         BlockCipher.__init__(self,key,mode,IV,counter,cipher_module)
  69
  70     def keylen_valid(self,key):
  71         return 8 <= len(key) <= 56
  72
  73 def _test():
  74     import doctest
  75     doctest.testmod()
  76
  77 if __name__ == "__main__":
  78     _test()