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# Authors:
# Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2010 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
import binascii
from cryptography.hazmat.backends import default_backend
import cryptography.x509
def strip_header(csr):
"""
Remove the header and footer (and surrounding material) from a CSR.
"""
headerlen = 40
s = csr.find("-----BEGIN NEW CERTIFICATE REQUEST-----")
if s == -1:
headerlen = 36
s = csr.find("-----BEGIN CERTIFICATE REQUEST-----")
if s >= 0:
e = csr.find("-----END")
csr = csr[s+headerlen:e]
return csr
def load_certificate_request(data):
"""
Load a PEM or base64-encoded PKCS #10 certificate request.
:return: a python-cryptography ``Certificate`` object.
:raises: ``ValueError`` if unable to load the request
"""
data = strip_header(data)
try:
data = binascii.a2b_base64(data)
except binascii.Error as e:
raise ValueError(e)
return cryptography.x509.load_der_x509_csr(data, default_backend())
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