125 lines
3.1 KiB
Python
125 lines
3.1 KiB
Python
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# This file is being contributed to 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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# S/MIME Version 3.2 Message Specification
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#
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# ASN.1 source from:
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# https://www.rfc-editor.org/rfc/rfc5751.txt
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from pyasn1.type import namedtype
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from pyasn1.type import opentype
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from pyasn1.type import tag
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from pyasn1.type import univ
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from pyasn1_modules import rfc5652
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from pyasn1_modules import rfc8018
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def _OID(*components):
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output = []
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for x in tuple(components):
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if isinstance(x, univ.ObjectIdentifier):
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output.extend(list(x))
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else:
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output.append(int(x))
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return univ.ObjectIdentifier(output)
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# Imports from RFC 5652 and RFC 8018
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IssuerAndSerialNumber = rfc5652.IssuerAndSerialNumber
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RecipientKeyIdentifier = rfc5652.RecipientKeyIdentifier
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SubjectKeyIdentifier = rfc5652.SubjectKeyIdentifier
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rc2CBC = rfc8018.rc2CBC
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# S/MIME Capabilities Attribute
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smimeCapabilities = univ.ObjectIdentifier('1.2.840.113549.1.9.15')
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smimeCapabilityMap = { }
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class SMIMECapability(univ.Sequence):
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pass
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SMIMECapability.componentType = namedtype.NamedTypes(
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namedtype.NamedType('capabilityID', univ.ObjectIdentifier()),
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namedtype.OptionalNamedType('parameters', univ.Any(),
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openType=opentype.OpenType('capabilityID', smimeCapabilityMap))
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)
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class SMIMECapabilities(univ.SequenceOf):
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pass
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SMIMECapabilities.componentType = SMIMECapability()
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class SMIMECapabilitiesParametersForRC2CBC(univ.Integer):
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# which carries the RC2 Key Length (number of bits)
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pass
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# S/MIME Encryption Key Preference Attribute
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id_smime = univ.ObjectIdentifier('1.2.840.113549.1.9.16')
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id_aa = _OID(id_smime, 2)
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id_aa_encrypKeyPref = _OID(id_aa, 11)
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class SMIMEEncryptionKeyPreference(univ.Choice):
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pass
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SMIMEEncryptionKeyPreference.componentType = namedtype.NamedTypes(
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namedtype.NamedType('issuerAndSerialNumber',
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IssuerAndSerialNumber().subtype(implicitTag=tag.Tag(
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tag.tagClassContext, tag.tagFormatSimple, 0))),
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namedtype.NamedType('receipentKeyId',
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# Yes, 'receipentKeyId' is spelled incorrectly, but kept
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# this way for alignment with the ASN.1 module in the RFC.
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RecipientKeyIdentifier().subtype(implicitTag=tag.Tag(
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tag.tagClassContext, tag.tagFormatSimple, 1))),
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namedtype.NamedType('subjectAltKeyIdentifier',
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SubjectKeyIdentifier().subtype(implicitTag=tag.Tag(
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tag.tagClassContext, tag.tagFormatSimple, 2)))
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)
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# The Prefer Binary Inside SMIMECapabilities attribute
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id_cap = _OID(id_smime, 11)
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id_cap_preferBinaryInside = _OID(id_cap, 1)
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# CMS Attribute Map
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_cmsAttributesMapUpdate = {
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smimeCapabilities: SMIMECapabilities(),
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id_aa_encrypKeyPref: SMIMEEncryptionKeyPreference(),
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}
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rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate)
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# SMIMECapabilities Attribute Map
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#
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# Do not include OIDs in the dictionary when the parameters are absent.
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_smimeCapabilityMapUpdate = {
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rc2CBC: SMIMECapabilitiesParametersForRC2CBC(),
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}
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smimeCapabilityMap.update(_smimeCapabilityMapUpdate)
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