src/Cipher/Blowfish.py

   1 from blockcipher import *
   2 import Crypto.Cipher.Blowfish
   3
   4 def new(key,mode=MODE_ECB,IV=None,counter=None):
   5     """Create a new cipher object
   6
   7     Blowfish using pycrypto for algo and pycryptoplus for ciphermode
   8
   9     new(key,mode=MODE_ECB,IV=None,counter=None):
  10         key = raw string containing the key
  11         mode = Blowfish.MODE_ECB/CBC/CFB/OFB/CTR/XTS/CMAC, default is ECB
  12         IV = IV as a raw string
  13             -> only needed for CBC mode
  14         counter = counter object (CryptoPlus.Util.util.Counter)
  15             -> only needed for CTR mode
  16
  17     ECB EXAMPLE: http://www.schneier.com/code/vectors.txt
  18     -------------
  19     >>> import Blowfish
  20     >>> from binascii import hexlify, unhexlify
  21     >>> cipher = Blowfish.new(unhexlify('0131D9619DC1376E'))
  22     >>> hexlify( cipher.encrypt(unhexlify('5CD54CA83DEF57DA')) )
  23     'b1b8cc0b250f09a0'
  24     >>> hexlify( cipher.decrypt(unhexlify(_)) )
  25     '5cd54ca83def57da'
  26
  27     CBC, CFB, OFB EXAMPLE: http://www.schneier.com/code/vectors.txt
  28     ----------------------
  29     >>> from binascii import hexlify,unhexlify
  30     >>> key = unhexlify('0123456789ABCDEFF0E1D2C3B4A59687')
  31     >>> IV = unhexlify('FEDCBA9876543210')
  32     >>> plaintext = unhexlify('37363534333231204E6F77206973207468652074696D6520')
  33     >>> cipher = Blowfish.new(key,Blowfish.MODE_CBC,IV)
  34     >>> ciphertext = cipher.encrypt(plaintext)
  35     >>> hexlify(ciphertext).upper()
  36     '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9'
  37
  38
  39     >>> key = '0123456789ABCDEFF0E1D2C3B4A59687'.decode('hex')
  40     >>> iv = 'FEDCBA9876543210'.decode('hex')
  41     >>> plaintext = '37363534333231204E6F77206973207468652074696D6520666F722000'.decode('hex')
  42
  43     >>> cipher = Blowfish.new(key,Blowfish.MODE_CBC,iv)
  44     >>> ciphertext = cipher.encrypt(plaintext)
  45     >>> hexlify(ciphertext).upper()
  46     '6B77B4D63006DEE605B156E27403979358DEB9E7154616D9'
  47
  48     >>> cipher = Blowfish.new(key,Blowfish.MODE_CFB,iv)
  49     >>> ciphertext = cipher.encrypt(plaintext)
  50     >>> hexlify(ciphertext).upper()
  51     'E73214A2822139CAF26ECF6D2EB9E76E3DA3DE04D1517200519D57A6C3'
  52
  53     >>> cipher = Blowfish.new(key,Blowfish.MODE_OFB,iv)
  54     >>> ciphertext = cipher.encrypt(plaintext)
  55     >>> hexlify(ciphertext).upper()
  56     'E73214A2822139CA62B343CC5B65587310DD908D0C241B2263C2CF80DA'
  57     """
  58     return Blowfish(key,mode,IV,counter)
  59
  60 class Blowfish(BlockCipher):
  61     def __init__(self,key,mode,IV,counter):
  62         self.cipher = Crypto.Cipher.Blowfish.new(key)
  63         self.blocksize = Crypto.Cipher.Blowfish.block_size
  64         BlockCipher.__init__(self,key,mode,IV,counter)
  65
  66 def _test():
  67     import doctest
  68     doctest.testmod()
  69
  70 if __name__ == "__main__":
  71     _test()