110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
|
|
# Copyright 2022 Bohdan Horbeshko <bodqhrohro@gmail.com>
|
|
#
|
|
# This file is part of the python-potr library.
|
|
#
|
|
# python-potr is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published by
|
|
# the Free Software Foundation; either version 3 of the License, or
|
|
# any later version.
|
|
#
|
|
# python-potr is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
# some python3 compatibilty
|
|
from __future__ import unicode_literals
|
|
|
|
import logging
|
|
import struct
|
|
|
|
from gajim_otrplugin.potr.utils import human_hash, bytes_to_long, unpack, pack_mpi
|
|
|
|
DEFAULT_KEYTYPE = 0x0000
|
|
pkTypes = {}
|
|
def registerkeytype(cls):
|
|
if cls.keyType is None:
|
|
raise TypeError('registered key class needs a type value')
|
|
pkTypes[cls.keyType] = cls
|
|
return cls
|
|
|
|
def generateDefaultKey():
|
|
return pkTypes[DEFAULT_KEYTYPE].generate()
|
|
|
|
class PK(object):
|
|
keyType = None
|
|
|
|
@classmethod
|
|
def generate(cls):
|
|
raise NotImplementedError
|
|
|
|
@classmethod
|
|
def parsePayload(cls, data, private=False):
|
|
raise NotImplementedError
|
|
|
|
def sign(self, data):
|
|
raise NotImplementedError
|
|
def verify(self, data):
|
|
raise NotImplementedError
|
|
def fingerprint(self):
|
|
raise NotImplementedError
|
|
|
|
def serializePublicKey(self):
|
|
return struct.pack(b'!H', self.keyType) \
|
|
+ self.getSerializedPublicPayload()
|
|
|
|
def getSerializedPublicPayload(self):
|
|
buf = b''
|
|
for x in self.getPublicPayload():
|
|
buf += pack_mpi(x)
|
|
return buf
|
|
|
|
def getPublicPayload(self):
|
|
raise NotImplementedError
|
|
|
|
def serializePrivateKey(self):
|
|
return struct.pack(b'!H', self.keyType) \
|
|
+ self.getSerializedPrivatePayload()
|
|
|
|
def getSerializedPrivatePayload(self):
|
|
buf = b''
|
|
for x in self.getPrivatePayload():
|
|
buf += pack_mpi(x)
|
|
return buf
|
|
|
|
def getPrivatePayload(self):
|
|
raise NotImplementedError
|
|
|
|
def cfingerprint(self):
|
|
return '{0:040x}'.format(bytes_to_long(self.fingerprint()))
|
|
|
|
@classmethod
|
|
def parsePrivateKey(cls, data):
|
|
implCls, data = cls.getImplementation(data)
|
|
logging.debug('Got privkey of type %r', implCls)
|
|
return implCls.parsePayload(data, private=True)
|
|
|
|
@classmethod
|
|
def parsePublicKey(cls, data):
|
|
implCls, data = cls.getImplementation(data)
|
|
logging.debug('Got pubkey of type %r', implCls)
|
|
return implCls.parsePayload(data)
|
|
|
|
def __str__(self):
|
|
return human_hash(self.cfingerprint())
|
|
def __repr__(self):
|
|
return '<{cls}(fpr=\'{fpr}\')>'.format(
|
|
cls=self.__class__.__name__, fpr=str(self))
|
|
|
|
@staticmethod
|
|
def getImplementation(data):
|
|
typeid, data = unpack(b'!H', data)
|
|
cls = pkTypes.get(typeid, None)
|
|
if cls is None:
|
|
raise NotImplementedError('unknown typeid %r' % typeid)
|
|
return cls, data
|