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91 lines
2.1 KiB
91 lines
2.1 KiB
2 years ago
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#
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# This file is part of pyasn1-modules software.
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#
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# Created by Russ Housley with assistance from asn1ate v.0.6.0.
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#
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# Copyright (c) 2019, Vigil Security, LLC
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# License: http://snmplabs.com/pyasn1/license.html
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#
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# Securing Header Fields with S/MIME
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#
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# ASN.1 source from:
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# https://www.rfc-editor.org/rfc/rfc7508.txt
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# https://www.rfc-editor.org/errata/eid5875
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#
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from pyasn1.type import char
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from pyasn1.type import constraint
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from pyasn1.type import namedtype
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from pyasn1.type import namedval
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from pyasn1.type import univ
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from pyasn1_modules import rfc5652
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import string
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MAX = float('inf')
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class Algorithm(univ.Enumerated):
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namedValues = namedval.NamedValues(
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('canonAlgorithmSimple', 0),
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('canonAlgorithmRelaxed', 1)
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)
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class HeaderFieldStatus(univ.Integer):
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namedValues = namedval.NamedValues(
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('duplicated', 0),
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('deleted', 1),
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('modified', 2)
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)
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class HeaderFieldName(char.VisibleString):
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subtypeSpec = (
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constraint.PermittedAlphabetConstraint(*string.printable) -
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constraint.PermittedAlphabetConstraint(':')
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)
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class HeaderFieldValue(char.UTF8String):
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pass
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class HeaderField(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('field-Name', HeaderFieldName()),
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namedtype.NamedType('field-Value', HeaderFieldValue()),
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namedtype.DefaultedNamedType('field-Status',
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HeaderFieldStatus().subtype(value='duplicated'))
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)
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class HeaderFields(univ.SequenceOf):
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componentType = HeaderField()
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subtypeSpec = constraint.ValueSizeConstraint(1, MAX)
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class SecureHeaderFields(univ.Set):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('canonAlgorithm', Algorithm()),
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namedtype.NamedType('secHeaderFields', HeaderFields())
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)
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id_aa = univ.ObjectIdentifier((1, 2, 840, 113549, 1, 9, 16, 2, ))
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id_aa_secureHeaderFieldsIdentifier = id_aa + (55, )
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# Map of Attribute Type OIDs to Attributes added to the
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# ones that are in rfc5652.py
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_cmsAttributesMapUpdate = {
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id_aa_secureHeaderFieldsIdentifier: SecureHeaderFields(),
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}
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rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate)
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