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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 # We use a UserWarning subclass, instead of DeprecationWarning, because CPython # decided deprecation warnings should be invisble by default. class CryptographyDeprecationWarning(UserWarning): pass # 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. PersistentlyDeprecated2017 = CryptographyDeprecationWarning PersistentlyDeprecated2018 = CryptographyDeprecationWarning DeprecatedIn25 = CryptographyDeprecationWarning DeprecatedIn27 = CryptographyDeprecationWarning def _check_bytes(name, value): if not isinstance(value, bytes): raise TypeError("{} must be bytes".format(name)) def _check_byteslike(name, value): try: memoryview(value) except TypeError: raise TypeError("{} must be bytes-like".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 return int(binascii.hexlify(data), 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( "{} is missing a {!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( "{}.{}'s signature differs from the expected. Expected: " "{!r}. Received: {!r}".format( klass, method, sig, actual ) ) # No longer needed as of 2.2, but retained because we have external consumers # who use it. def bit_length(x): return x.bit_length() 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_{}".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)