Current File : //opt/alt/python37/lib64/python3.7/site-packages/Crypto/Cipher/DES3.py
# -*- coding: utf-8 -*-
#
# Cipher/DES3.py : DES3
#
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# the extent that dedication to the public domain is not available,
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"""Triple DES symmetric cipher
`Triple DES`__ (or TDES or TDEA or 3DES) is a symmetric block cipher standardized by NIST_.
It has a fixed data block size of 8 bytes. Its keys are 128 (*Option 1*) or 192
bits (*Option 2*) long.
However, 1 out of 8 bits is used for redundancy and do not contribute to
security. The effective key length is respectively 112 or 168 bits.
TDES consists of the concatenation of 3 simple `DES` ciphers.
The plaintext is first DES encrypted with *K1*, then decrypted with *K2*,
and finally encrypted again with *K3*. The ciphertext is decrypted in the reverse manner.
The 192 bit key is a bundle of three 64 bit independent subkeys: *K1*, *K2*, and *K3*.
The 128 bit key is split into *K1* and *K2*, whereas *K1=K3*.
It is important that all subkeys are different, otherwise TDES would degrade to
single `DES`.
TDES is cryptographically secure, even though it is neither as secure nor as fast
as `AES`.
As an example, encryption can be done as follows:
>>> from Crypto.Cipher import DES
>>> from Crypto import Random
>>> from Crypto.Util import Counter
>>>
>>> key = b'-8B key-'
>>> nonce = Random.new().read(DES.block_size/2)
>>> ctr = Counter.new(DES.block_size*8/2, prefix=nonce)
>>> cipher = DES.new(key, DES.MODE_CTR, counter=ctr)
>>> plaintext = b'We are no longer the knights who say ni!'
>>> msg = nonce + cipher.encrypt(plaintext)
.. __: http://en.wikipedia.org/wiki/Triple_DES
.. _NIST: http://csrc.nist.gov/publications/nistpubs/800-67/SP800-67.pdf
:undocumented: __revision__, __package__
"""
__revision__ = "$Id$"
from Crypto.Cipher import blockalgo
from Crypto.Cipher import _DES3
class DES3Cipher(blockalgo.BlockAlgo):
"""TDES cipher object"""
def __init__(self, key, *args, **kwargs):
"""Initialize a TDES cipher object
See also `new()` at the module level."""
blockalgo.BlockAlgo.__init__(self, _DES3, key, *args, **kwargs)
def new(key, *args, **kwargs):
"""Create a new TDES cipher
:Parameters:
key : byte string
The secret key to use in the symmetric cipher.
It must be 16 or 24 bytes long. The parity bits will be ignored.
:Keywords:
mode : a *MODE_** constant
The chaining mode to use for encryption or decryption.
Default is `MODE_ECB`.
IV : byte string
The initialization vector to use for encryption or decryption.
It is ignored for `MODE_ECB` and `MODE_CTR`.
For `MODE_OPENPGP`, IV must be `block_size` bytes long for encryption
and `block_size` +2 bytes for decryption (in the latter case, it is
actually the *encrypted* IV which was prefixed to the ciphertext).
It is mandatory.
For all other modes, it must be `block_size` bytes longs. It is optional and
when not present it will be given a default value of all zeroes.
counter : callable
(*Only* `MODE_CTR`). A stateful function that returns the next
*counter block*, which is a byte string of `block_size` bytes.
For better performance, use `Crypto.Util.Counter`.
segment_size : integer
(*Only* `MODE_CFB`).The number of bits the plaintext and ciphertext
are segmented in.
It must be a multiple of 8. If 0 or not specified, it will be assumed to be 8.
:Attention: it is important that all 8 byte subkeys are different,
otherwise TDES would degrade to single `DES`.
:Return: an `DES3Cipher` object
"""
return DES3Cipher(key, *args, **kwargs)
#: Electronic Code Book (ECB). See `blockalgo.MODE_ECB`.
MODE_ECB = 1
#: Cipher-Block Chaining (CBC). See `blockalgo.MODE_CBC`.
MODE_CBC = 2
#: Cipher FeedBack (CFB). See `blockalgo.MODE_CFB`.
MODE_CFB = 3
#: This mode should not be used.
MODE_PGP = 4
#: Output FeedBack (OFB). See `blockalgo.MODE_OFB`.
MODE_OFB = 5
#: CounTer Mode (CTR). See `blockalgo.MODE_CTR`.
MODE_CTR = 6
#: OpenPGP Mode. See `blockalgo.MODE_OPENPGP`.
MODE_OPENPGP = 7
#: Size of a data block (in bytes)
block_size = 8
#: Size of a key (in bytes)
key_size = ( 16, 24 )
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