/usr/lib/python3/dist-packages/cryptography/utils.py is in python3-cryptography 2.1.4-1ubuntu1.1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | # This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import abc
import binascii
import inspect
import sys
import warnings
# Several APIs were deprecated with no specific end-of-life date because of the
# ubiquity of their use. They should not be removed until we agree on when that
# cycle ends.
PersistentlyDeprecated = DeprecationWarning
DeprecatedIn19 = DeprecationWarning
DeprecatedIn21 = PendingDeprecationWarning
def _check_bytes(name, value):
if not isinstance(value, bytes):
raise TypeError("{0} must be bytes".format(name))
def read_only_property(name):
return property(lambda self: getattr(self, name))
def register_interface(iface):
def register_decorator(klass):
verify_interface(iface, klass)
iface.register(klass)
return klass
return register_decorator
def register_interface_if(predicate, iface):
def register_decorator(klass):
if predicate:
verify_interface(iface, klass)
iface.register(klass)
return klass
return register_decorator
if hasattr(int, "from_bytes"):
int_from_bytes = int.from_bytes
else:
def int_from_bytes(data, byteorder, signed=False):
assert byteorder == 'big'
assert not signed
# call bytes() on data to allow the use of bytearrays
return int(bytes(data).encode('hex'), 16)
if hasattr(int, "to_bytes"):
def int_to_bytes(integer, length=None):
return integer.to_bytes(
length or (integer.bit_length() + 7) // 8 or 1, 'big'
)
else:
def int_to_bytes(integer, length=None):
hex_string = '%x' % integer
if length is None:
n = len(hex_string)
else:
n = length * 2
return binascii.unhexlify(hex_string.zfill(n + (n & 1)))
class InterfaceNotImplemented(Exception):
pass
if hasattr(inspect, "signature"):
signature = inspect.signature
else:
signature = inspect.getargspec
def verify_interface(iface, klass):
for method in iface.__abstractmethods__:
if not hasattr(klass, method):
raise InterfaceNotImplemented(
"{0} is missing a {1!r} method".format(klass, method)
)
if isinstance(getattr(iface, method), abc.abstractproperty):
# Can't properly verify these yet.
continue
sig = signature(getattr(iface, method))
actual = signature(getattr(klass, method))
if sig != actual:
raise InterfaceNotImplemented(
"{0}.{1}'s signature differs from the expected. Expected: "
"{2!r}. Received: {3!r}".format(
klass, method, sig, actual
)
)
if sys.version_info >= (2, 7):
def bit_length(x):
return x.bit_length()
else:
def bit_length(x):
return len(bin(x)) - (2 + (x <= 0))
class _DeprecatedValue(object):
def __init__(self, value, message, warning_class):
self.value = value
self.message = message
self.warning_class = warning_class
class _ModuleWithDeprecations(object):
def __init__(self, module):
self.__dict__["_module"] = module
def __getattr__(self, attr):
obj = getattr(self._module, attr)
if isinstance(obj, _DeprecatedValue):
warnings.warn(obj.message, obj.warning_class, stacklevel=2)
obj = obj.value
return obj
def __setattr__(self, attr, value):
setattr(self._module, attr, value)
def __delattr__(self, attr):
obj = getattr(self._module, attr)
if isinstance(obj, _DeprecatedValue):
warnings.warn(obj.message, obj.warning_class, stacklevel=2)
delattr(self._module, attr)
def __dir__(self):
return ["_module"] + dir(self._module)
def deprecated(value, module_name, message, warning_class):
module = sys.modules[module_name]
if not isinstance(module, _ModuleWithDeprecations):
sys.modules[module_name] = _ModuleWithDeprecations(module)
return _DeprecatedValue(value, message, warning_class)
def cached_property(func):
cached_name = "_cached_{0}".format(func)
sentinel = object()
def inner(instance):
cache = getattr(instance, cached_name, sentinel)
if cache is not sentinel:
return cache
result = func(instance)
setattr(instance, cached_name, result)
return result
return property(inner)
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