You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.2 KiB
67 lines
2.2 KiB
#!/usr/bin/env python
|
|
|
|
# Copyright (c) 2014 clowwindy
|
|
#
|
|
# 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.
|
|
|
|
from __future__ import absolute_import, division, print_function, \
|
|
with_statement
|
|
|
|
import hmac
|
|
import hashlib
|
|
|
|
from shadowsocks import common
|
|
|
|
__all__ = ['auths']
|
|
|
|
|
|
class HMAC(object):
|
|
@staticmethod
|
|
def auth(method, key, data):
|
|
digest = common.to_str(method.replace(b'hmac-', b''))
|
|
return hmac.new(key, data, getattr(hashlib, digest)).digest()
|
|
|
|
@staticmethod
|
|
def verify(method, key, data, tag):
|
|
digest = common.to_str(method.replace(b'hmac-', b''))
|
|
t = hmac.new(key, data, getattr(hashlib, digest)).digest()
|
|
if hasattr(hmac, 'compare_digest'):
|
|
return hmac.compare_digest(t, tag)
|
|
else:
|
|
return _time_independent_equals(t, tag)
|
|
|
|
|
|
# from tornado
|
|
def _time_independent_equals(a, b):
|
|
if len(a) != len(b):
|
|
return False
|
|
result = 0
|
|
if type(a[0]) is int: # python3 byte strings
|
|
for x, y in zip(a, b):
|
|
result |= x ^ y
|
|
else: # python2
|
|
for x, y in zip(a, b):
|
|
result |= ord(x) ^ ord(y)
|
|
return result == 0
|
|
|
|
|
|
auths = {
|
|
b'hmac-md5': (32, 16, HMAC),
|
|
b'hmac-sha256': (32, 32, HMAC),
|
|
}
|
|
|