codekingpro/portable-devtools

1# This file is being contributed to pyasn1-modules software.2#3# Created by Russ Housley with assistance from asn1ate v.0.6.0.4#5# Copyright (c) 2019, Vigil Security, LLC6# License: http://snmplabs.com/pyasn1/license.html7#8# S/MIME Version 3.2 Message Specification9#10# ASN.1 source from:11# https://www.rfc-editor.org/rfc/rfc5751.txt12 13from pyasn1.type import namedtype14from pyasn1.type import opentype15from pyasn1.type import tag16from pyasn1.type import univ17 18from pyasn1_modules import rfc565219from pyasn1_modules import rfc801820 21 22def _OID(*components):23    output = []24    for x in tuple(components):25        if isinstance(x, univ.ObjectIdentifier):26            output.extend(list(x))27        else:28            output.append(int(x))29    return univ.ObjectIdentifier(output)30 31 32# Imports from RFC 5652 and RFC 801833 34IssuerAndSerialNumber = rfc5652.IssuerAndSerialNumber35 36RecipientKeyIdentifier = rfc5652.RecipientKeyIdentifier37 38SubjectKeyIdentifier = rfc5652.SubjectKeyIdentifier39 40rc2CBC = rfc8018.rc2CBC41 42 43# S/MIME Capabilities Attribute44 45smimeCapabilities = univ.ObjectIdentifier('1.2.840.113549.1.9.15')46 47 48smimeCapabilityMap = { }49 50 51class SMIMECapability(univ.Sequence):52    pass53 54SMIMECapability.componentType = namedtype.NamedTypes(55    namedtype.NamedType('capabilityID', univ.ObjectIdentifier()),56    namedtype.OptionalNamedType('parameters', univ.Any(),57        openType=opentype.OpenType('capabilityID', smimeCapabilityMap))58)59 60 61class SMIMECapabilities(univ.SequenceOf):62    pass63 64SMIMECapabilities.componentType = SMIMECapability()65 66 67class SMIMECapabilitiesParametersForRC2CBC(univ.Integer):68    # which carries the RC2 Key Length (number of bits)69    pass70 71 72# S/MIME Encryption Key Preference Attribute73 74id_smime = univ.ObjectIdentifier('1.2.840.113549.1.9.16')75 76id_aa = _OID(id_smime, 2)77 78id_aa_encrypKeyPref = _OID(id_aa, 11)79 80 81class SMIMEEncryptionKeyPreference(univ.Choice):82    pass83 84SMIMEEncryptionKeyPreference.componentType = namedtype.NamedTypes(85    namedtype.NamedType('issuerAndSerialNumber',86        IssuerAndSerialNumber().subtype(implicitTag=tag.Tag(87            tag.tagClassContext, tag.tagFormatSimple, 0))),88    namedtype.NamedType('receipentKeyId',89        # Yes, 'receipentKeyId' is spelled incorrectly, but kept90        # this way for alignment with the ASN.1 module in the RFC.91        RecipientKeyIdentifier().subtype(implicitTag=tag.Tag(92            tag.tagClassContext, tag.tagFormatSimple, 1))),93    namedtype.NamedType('subjectAltKeyIdentifier',94        SubjectKeyIdentifier().subtype(implicitTag=tag.Tag(95            tag.tagClassContext, tag.tagFormatSimple, 2)))96)97 98 99# The Prefer Binary Inside SMIMECapabilities attribute100 101id_cap = _OID(id_smime, 11)102 103id_cap_preferBinaryInside = _OID(id_cap, 1)104 105 106# CMS Attribute Map107 108_cmsAttributesMapUpdate = {109    smimeCapabilities: SMIMECapabilities(),110    id_aa_encrypKeyPref: SMIMEEncryptionKeyPreference(),111}112 113rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate)114 115 116# SMIMECapabilities Attribute Map117#118# Do not include OIDs in the dictionary when the parameters are absent.119 120_smimeCapabilityMapUpdate = {121    rc2CBC: SMIMECapabilitiesParametersForRC2CBC(),122}123 124smimeCapabilityMap.update(_smimeCapabilityMapUpdate)125