0,0 → 1,57 |
from blockcipher import * |
import Crypto.Cipher.CAST |
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def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None): |
"""Create a new cipher object |
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CAST using pycrypto for algo and pycryptoplus for ciphermode |
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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 |
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EXAMPLES: |
********** |
IMPORTING: |
----------- |
>>> from CryptoPlus.Cipher import CAST |
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ECB example: http://www.rfc-editor.org/rfc/rfc2144.txt |
------------- |
128 bit key |
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>>> key = "0123456712345678234567893456789A".decode('hex') |
>>> plaintext = "0123456789ABCDEF".decode('hex') |
>>> cipher = CAST.new(key,CAST.MODE_ECB,) |
>>> cipher.encrypt(plaintext).encode('hex') |
'238b4fe5847e44b2' |
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40 bit key |
>>> from CryptoPlus.Cipher import CAST |
>>> key = "0123456712".decode('hex') |
>>> plaintext = "0123456789ABCDEF".decode('hex') |
>>> cipher = CAST.new(key,CAST.MODE_ECB,) |
>>> cipher.encrypt(plaintext).encode('hex').upper() |
'7AC816D16E9B302E' |
""" |
return CAST(key,mode,IV,counter,segment_size) |
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class CAST(BlockCipher): |
def __init__(self,key,mode,IV,counter,segment_size): |
cipher_module = Crypto.Cipher.CAST.new |
self.blocksize = 8 |
BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size) |
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def _test(): |
import doctest |
doctest.testmod() |
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if __name__ == "__main__": |
_test() |