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# $Id$
"""Signed manifests. This is just the ASN.1 encoder, the rest is in
rpki.x509 with the rest of the DER_object code.
Note that rpki.x509.SignedManifest inmplements the signed manifest;
the structures here are just the payload of the CMS eContent field.
"""
from POW._der import *
class FileAndHash(Sequence):
def __init__(self, optional=0, default=''):
self.file = IA5String()
self.hash = AltBitString()
contents = [ self.file, self.hash ]
Sequence.__init__(self, contents, optional, default)
class FilesAndHashes(SequenceOf):
def __init__(self, optional=0, default=''):
SequenceOf.__init__(self, FileAndHash, optional, default)
class Manifest(Sequence):
def __init__(self, optional=0, default=''):
# I'm having trouble decoding the ASN.1 as currently specified.
# I've asked about this on the mailing list, but I see three
# options:
#
# 1) What the spec currently says, which doesn't quite work.
#
# 2) Get rid of the default on the version field, which might
# make sense as it doesn't waste a lot of space.
#
# 3) Explictly tag the version field, which seems to be the usual
# ASN.1 thing to do in these situations.
#
# Until the mailing list settles this, I've included code for all
# three options here, using the numbers above.
#
# Clean all this up once the mailing list settles it.
which_option = 1
if which_option == 1:
self.version = Integer(0, "AgEA")
if which_option in (2, 3):
self.version = Integer()
if which_option == 3:
self.explicitVersion = Explicit(CLASS_CONTEXT, FORM_CONSTRUCTED, 0, self.version, 0, 'oAMCAQA=')
self.manifestNumber = Integer()
self.thisUpdate = GeneralizedTime()
self.nextUpdate = GeneralizedTime()
self.fileHashAlg = Oid()
self.fileList = FilesAndHashes()
if which_option in (1, 2):
contents = [ self.version ]
else:
contents = [ self.explicitVersion ]
contents += [
self.manifestNumber,
self.thisUpdate,
self.nextUpdate,
self.fileHashAlg,
self.fileList ]
Sequence.__init__(self, contents, optional, default)
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