forked from doegox/python-cryptoplus
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathDES3.py
More file actions
75 lines (64 loc) · 2.97 KB
/
DES3.py
File metadata and controls
75 lines (64 loc) · 2.97 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
from __future__ import absolute_import
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
>>> 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()
if __name__ == "__main__":
_test()