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# signature.py - module for handling signed XML files
# coding: utf-8
#
# Copyright (C) 2017 Arthur de Jong
#
# This library 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 2.1 of the License, or (at your option) any later version.
#
# This library 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""Module for handling signed PSKC files.
This module defines a Signature class that handles the signature checking,
keys and certificates.
"""
class Signature(object):
"""Class for handling signature checking of the PSKC file.
Instances of this class provide the following properties:
is_signed: boolean to indicate whether a signature is present
algorithm: identifier of the signing algorithm used
canonicalization_method: identifier of the XML canonicalization used
digest_algorithm: algorithm used for creating the hash
issuer: issuer of the certificate
serial: serial number of the certificate
certificate: the certificate that is embedded in the signature
"""
def __init__(self, pskc):
self.pskc = pskc
self._algorithm = None
self.canonicalization_method = None
self.digest_algorithm = None
self.issuer = None
self.serial = None
self.certificate = None
@property
def is_signed(self):
"""Test whether the PSKC file contains a signature (not whether the
signature is valid)."""
return bool(
self.algorithm or self.canonicalization_method or
self.digest_algorithm or self.issuer or self.certificate)
@property
def algorithm(self):
"""Provide the signing algorithm used."""
if self._algorithm:
return self._algorithm
@algorithm.setter
def algorithm(self, value):
from pskc.algorithms import normalise_algorithm
self._algorithm = normalise_algorithm(value)
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