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