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# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
#
# 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 potr.utils import human_hash, bytes_to_long, unpack, pack_mpi
DEFAULT_KEYTYPE = 0x0000
pkTypes = {}
def registerkeytype(cls):
if not hasattr(cls, 'parsePayload'):
raise TypeError('registered key types need parsePayload()')
pkTypes[cls.keyType] = cls
return cls
def generateDefaultKey():
return pkTypes[DEFAULT_KEYTYPE].generate()
class PK(object):
__slots__ = []
@classmethod
def generate(cls):
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
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