1# 2# This file is part of pyasn1-modules software. 3# 4# Created by Russ Housley with assistance from asn1ate v.0.6.0. 5# 6# Copyright (c) 2019, Vigil Security, LLC 7# License: http://snmplabs.com/pyasn1/license.html 8# 9# Securing Header Fields with S/MIME 10# 11# ASN.1 source from: 12# https://www.rfc-editor.org/rfc/rfc7508.txt 13# https://www.rfc-editor.org/errata/eid5875 14# 15 16from pyasn1.type import char 17from pyasn1.type import constraint 18from pyasn1.type import namedtype 19from pyasn1.type import namedval 20from pyasn1.type import univ 21 22from pyasn1_modules import rfc5652 23 24import string 25 26MAX = float('inf') 27 28 29class Algorithm(univ.Enumerated): 30 namedValues = namedval.NamedValues( 31 ('canonAlgorithmSimple', 0), 32 ('canonAlgorithmRelaxed', 1) 33 ) 34 35 36class HeaderFieldStatus(univ.Integer): 37 namedValues = namedval.NamedValues( 38 ('duplicated', 0), 39 ('deleted', 1), 40 ('modified', 2) 41 ) 42 43 44class HeaderFieldName(char.VisibleString): 45 subtypeSpec = ( 46 constraint.PermittedAlphabetConstraint(*string.printable) - 47 constraint.PermittedAlphabetConstraint(':') 48 ) 49 50 51class HeaderFieldValue(char.UTF8String): 52 pass 53 54 55class HeaderField(univ.Sequence): 56 componentType = namedtype.NamedTypes( 57 namedtype.NamedType('field-Name', HeaderFieldName()), 58 namedtype.NamedType('field-Value', HeaderFieldValue()), 59 namedtype.DefaultedNamedType('field-Status', 60 HeaderFieldStatus().subtype(value='duplicated')) 61 ) 62 63 64class HeaderFields(univ.SequenceOf): 65 componentType = HeaderField() 66 subtypeSpec = constraint.ValueSizeConstraint(1, MAX) 67 68 69class SecureHeaderFields(univ.Set): 70 componentType = namedtype.NamedTypes( 71 namedtype.NamedType('canonAlgorithm', Algorithm()), 72 namedtype.NamedType('secHeaderFields', HeaderFields()) 73 ) 74 75 76id_aa = univ.ObjectIdentifier((1, 2, 840, 113549, 1, 9, 16, 2, )) 77 78id_aa_secureHeaderFieldsIdentifier = id_aa + (55, ) 79 80 81 82# Map of Attribute Type OIDs to Attributes added to the 83# ones that are in rfc5652.py 84 85_cmsAttributesMapUpdate = { 86 id_aa_secureHeaderFieldsIdentifier: SecureHeaderFields(), 87} 88 89rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate) 90 91