0,0 → 1,59 |
from blockcipher import * |
import Crypto.Cipher.ARC2 |
import Crypto |
from pkg_resources import parse_version |
|
def new(key,mode=MODE_ECB,IV=None,counter=None,segment_size=None,effective_keylen=None): |
"""Create a new cipher object |
|
ARC2 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 |
effective_keylen = how much bits to effectively use from the supplied key |
-> will only be used when the pycrypto version on your system is >2.0.1 |
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EXAMPLES: |
********** |
IMPORTING: |
----------- |
>>> from CryptoPlus.Cipher import ARC2 |
|
http://www.ietf.org/rfc/rfc2268.txt |
Doctest will fail when using pycrypto 2.0.1 and older |
------------------------------------ |
>>> key = "0000000000000000".decode('hex') |
>>> plaintext = "0000000000000000".decode('hex') |
>>> ek = 63 |
>>> cipher = ARC2.new(key,ARC2.MODE_ECB,effective_keylen=ek) |
>>> cipher.encrypt(plaintext).encode('hex') |
'ebb773f993278eff' |
""" |
return ARC2(key,mode,IV,counter,effective_keylen,segment_size) |
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class ARC2(BlockCipher): |
def __init__(self,key,mode,IV,counter,effective_keylen,segment_size): |
# pycrypto versions newer than 2.0.1 will have support for "effective_keylen" |
if parse_version(Crypto.__version__) <= parse_version("2.0.1"): |
cipher_module = Crypto.Cipher.ARC2.new |
args = {} |
else: |
cipher_module = Crypto.Cipher.ARC2.new |
args = {'effective_keylen':effective_keylen} |
self.blocksize = 8 |
BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size,args) |
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def _test(): |
import doctest |
doctest.testmod() |
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if __name__ == "__main__": |
_test() |