/usr/lib/python2.7/dist-packages/autobahn/websocket/xormasker.py is in python-autobahn 0.10.3+dfsg1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | ###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Tavendo GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# 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.
#
###############################################################################
import six
# use Cython implementation of XorMasker validator if available
##
try:
from wsaccel.xormask import XorMaskerNull, createXorMasker
except ImportError:
# fallback to pure Python implementation
# http://stackoverflow.com/questions/15014310/python3-xrange-lack-hurts
try:
xrange
except NameError:
# Python 3
# noinspection PyShadowingBuiltins
xrange = range
from array import array
class XorMaskerNull(object):
# noinspection PyUnusedLocal
def __init__(self, mask=None):
self.ptr = 0
def pointer(self):
return self.ptr
def reset(self):
self.ptr = 0
def process(self, data):
self.ptr += len(data)
return data
class XorMaskerSimple(object):
def __init__(self, mask):
assert len(mask) == 4
self.ptr = 0
self.msk = array('B', mask)
def pointer(self):
return self.ptr
def reset(self):
self.ptr = 0
def process(self, data):
dlen = len(data)
payload = array('B', data)
for k in xrange(dlen):
payload[k] ^= self.msk[self.ptr & 3]
self.ptr += 1
if six.PY3:
return payload.tobytes()
else:
return payload.tostring()
class XorMaskerShifted1(object):
def __init__(self, mask):
assert len(mask) == 4
self.ptr = 0
self.mskarray = [array('B'), array('B'), array('B'), array('B')]
if six.PY3:
for j in xrange(4):
self.mskarray[0].append(mask[j & 3])
self.mskarray[1].append(mask[(j + 1) & 3])
self.mskarray[2].append(mask[(j + 2) & 3])
self.mskarray[3].append(mask[(j + 3) & 3])
else:
for j in xrange(4):
self.mskarray[0].append(ord(mask[j & 3]))
self.mskarray[1].append(ord(mask[(j + 1) & 3]))
self.mskarray[2].append(ord(mask[(j + 2) & 3]))
self.mskarray[3].append(ord(mask[(j + 3) & 3]))
def pointer(self):
return self.ptr
def reset(self):
self.ptr = 0
def process(self, data):
dlen = len(data)
payload = array('B', data)
msk = self.mskarray[self.ptr & 3]
for k in xrange(dlen):
payload[k] ^= msk[k & 3]
self.ptr += dlen
if six.PY3:
return payload.tobytes()
else:
return payload.tostring()
def createXorMasker(mask, length=None):
if length is None or length < 128:
return XorMaskerSimple(mask)
else:
return XorMaskerShifted1(mask)
|