CasperSecurity
# 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 cryptography import utils
class ObjectIdentifier(object):
def __init__(self, dotted_string: str):
self._dotted_string = dotted_string
nodes = self._dotted_string.split(".")
intnodes = []
# There must be at least 2 nodes, the first node must be 0..2, and
# if less than 2, the second node cannot have a value outside the
# range 0..39. All nodes must be integers.
for node in nodes:
try:
node_value = int(node, 10)
except ValueError:
raise ValueError(
"Malformed OID: %s (non-integer nodes)"
% (self._dotted_string)
)
if node_value < 0:
raise ValueError(
"Malformed OID: %s (negative-integer nodes)"
% (self._dotted_string)
)
intnodes.append(node_value)
if len(nodes) < 2:
raise ValueError(
"Malformed OID: %s (insufficient number of nodes)"
% (self._dotted_string)
)
if intnodes[0] > 2:
raise ValueError(
"Malformed OID: %s (first node outside valid range)"
% (self._dotted_string)
)
if intnodes[0] < 2 and intnodes[1] >= 40:
raise ValueError(
"Malformed OID: %s (second node outside valid range)"
% (self._dotted_string)
)
def __eq__(self, other):
if not isinstance(other, ObjectIdentifier):
return NotImplemented
return self.dotted_string == other.dotted_string
def __ne__(self, other):
return not self == other
def __repr__(self):
return "<ObjectIdentifier(oid={}, name={})>".format(
self.dotted_string, self._name
)
def __hash__(self):
return hash(self.dotted_string)
@property
def _name(self):
# Lazy import to avoid an import cycle
from cryptography.x509.oid import _OID_NAMES
return _OID_NAMES.get(self, "Unknown OID")
dotted_string = utils.read_only_property("_dotted_string")