0,0 → 1,74 |
from blockcipher import * |
import Crypto.Cipher.DES3 |
|
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 2/3 keys |
- DES-EDE2: supply 2 keys as 1 single concatenated 16byte key= key1|key2 |
- DES-EDE3: supply 3 keys as 1 single concatenated 24byte key= key1|key2|key3 |
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 DES3 |
|
CBC TDES-EDE3 EXAMPLE: (using test vectors from http://csrc.nist.gov/groups/STM/cavp/documents/des/DESMMT.pdf) |
------------ |
>>> key = ('37ae5ebf46dff2dc0754b94f31cbb3855e7fd36dc870bfae').decode('hex') |
>>> IV = ('3d1de3cc132e3b65').decode('hex') |
>>> cipher = DES3.new(key, DES3.MODE_CBC, IV) |
>>> ciphertext = cipher.encrypt(('84401f78fe6c10876d8ea23094ea5309').decode('hex')) |
>>> (ciphertext).encode('hex') |
'7b1f7c7e3b1c948ebd04a75ffba7d2f5' |
>>> decipher = DES3.new(key, DES3.MODE_CBC, IV) |
>>> plaintext = decipher.decrypt(ciphertext) |
>>> (plaintext).encode('hex') |
'84401f78fe6c10876d8ea23094ea5309' |
|
CMAC TDES-EDE3 EXAMPLE: (http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf) |
------------- |
>>> key = '8aa83bf8cbda10620bc1bf19fbb6cd58bc313d4a371ca8b5'.decode('hex') |
>>> plaintext = '6bc1bee22e409f96e93d7e117393172aae2d8a57'.decode('hex') |
>>> cipher = DES3.new(key, DES3.MODE_CMAC) |
>>> cipher.encrypt(plaintext).encode('hex') |
'743ddbe0ce2dc2ed' |
|
CMAC TDES-EDE2 EXAMPLE: |
----------------------- |
testvector: http://csrc.nist.gov/groups/STM/cavp/documents/mac/cmactestvectors.zip |
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>>> key1 = "5104f2c76180c1d3".decode('hex') |
>>> key2 = "b9df763e31ada716".decode('hex') |
>>> key = key1 + key2 |
>>> plaintext = 'a6866be2fa6678f264a19c4474968e3f4eec24f5086d'.decode('hex') |
>>> cipher = DES3.new(key, DES3.MODE_CMAC) |
>>> cipher.encrypt(plaintext).encode('hex') |
'32e7758f3f614dbf' |
""" |
return DES3(key,mode,IV,counter,segment_size) |
|
class DES3(BlockCipher): |
def __init__(self,key,mode,IV,counter,segment_size): |
cipher_module = Crypto.Cipher.DES3.new |
self.blocksize = 8 |
BlockCipher.__init__(self,key,mode,IV,counter,cipher_module,segment_size) |
|
def _test(): |
import doctest |
doctest.testmod() |
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if __name__ == "__main__": |
_test() |