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# -*- coding: utf-8 -*-
#
# Cipher/XOR.py : XOR
#
# ===================================================================
# The contents of this file are dedicated to the public domain. To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ===================================================================
"""XOR toy cipher
XOR is one the simplest stream ciphers. Encryption and decryption are
performed by XOR-ing data with a keystream made by contatenating
the key.
Do not use it for real applications!
:undocumented: __revision__, __package__
"""
__revision__ = "$Id$"
from Crypto.Cipher import _XOR
class XORCipher:
"""XOR cipher object"""
def __init__(self, key, *args, **kwargs):
"""Initialize a XOR cipher object
See also `new()` at the module level."""
self._cipher = _XOR.new(key, *args, **kwargs)
self.block_size = self._cipher.block_size
self.key_size = self._cipher.key_size
def encrypt(self, plaintext):
"""Encrypt a piece of data.
:Parameters:
plaintext : byte string
The piece of data to encrypt. It can be of any size.
:Return: the encrypted data (byte string, as long as the
plaintext).
"""
return self._cipher.encrypt(plaintext)
def decrypt(self, ciphertext):
"""Decrypt a piece of data.
:Parameters:
ciphertext : byte string
The piece of data to decrypt. It can be of any size.
:Return: the decrypted data (byte string, as long as the
ciphertext).
"""
return self._cipher.decrypt(ciphertext)
def new(key, *args, **kwargs):
"""Create a new XOR cipher
:Parameters:
key : byte string
The secret key to use in the symmetric cipher.
Its length may vary from 1 to 32 bytes.
:Return: an `XORCipher` object
"""
return XORCipher(key, *args, **kwargs)
#: Size of a data block (in bytes)
block_size = 1
#: Size of a key (in bytes)
key_size = xrange(1,32+1)
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