1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
# This file is being contributed to pyasn1-modules software.
#
# Created by Russ Housley with assistance from asn1ate v.0.6.0.
#
# Copyright (c) 2019, Vigil Security, LLC
# License: https://www.pysnmp.com/pyasn1/license.html
#
# S/MIME Version 3.2 Message Specification
#
# ASN.1 source from:
# https://www.rfc-editor.org/rfc/rfc5751.txt
from pyasn1.type import namedtype, opentype, tag, univ
from pyasn1_modules import rfc5652, rfc8018
def _OID(*components):
output = []
for x in tuple(components):
if isinstance(x, univ.ObjectIdentifier):
output.extend(list(x))
else:
output.append(int(x))
return univ.ObjectIdentifier(output)
# Imports from RFC 5652 and RFC 8018
IssuerAndSerialNumber = rfc5652.IssuerAndSerialNumber
RecipientKeyIdentifier = rfc5652.RecipientKeyIdentifier
SubjectKeyIdentifier = rfc5652.SubjectKeyIdentifier
rc2CBC = rfc8018.rc2CBC
# S/MIME Capabilities Attribute
smimeCapabilities = univ.ObjectIdentifier("1.2.840.113549.1.9.15")
smimeCapabilityMap = {}
class SMIMECapability(univ.Sequence):
pass
SMIMECapability.componentType = namedtype.NamedTypes(
namedtype.NamedType("capabilityID", univ.ObjectIdentifier()),
namedtype.OptionalNamedType(
"parameters",
univ.Any(),
openType=opentype.OpenType("capabilityID", smimeCapabilityMap),
),
)
class SMIMECapabilities(univ.SequenceOf):
pass
SMIMECapabilities.componentType = SMIMECapability()
class SMIMECapabilitiesParametersForRC2CBC(univ.Integer):
# which carries the RC2 Key Length (number of bits)
pass
# S/MIME Encryption Key Preference Attribute
id_smime = univ.ObjectIdentifier("1.2.840.113549.1.9.16")
id_aa = _OID(id_smime, 2)
id_aa_encrypKeyPref = _OID(id_aa, 11)
class SMIMEEncryptionKeyPreference(univ.Choice):
pass
SMIMEEncryptionKeyPreference.componentType = namedtype.NamedTypes(
namedtype.NamedType(
"issuerAndSerialNumber",
IssuerAndSerialNumber().subtype(
implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)
),
),
namedtype.NamedType(
"receipentKeyId",
# Yes, 'receipentKeyId' is spelled incorrectly, but kept
# this way for alignment with the ASN.1 module in the RFC.
RecipientKeyIdentifier().subtype(
implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1)
),
),
namedtype.NamedType(
"subjectAltKeyIdentifier",
SubjectKeyIdentifier().subtype(
implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2)
),
),
)
# The Prefer Binary Inside SMIMECapabilities attribute
id_cap = _OID(id_smime, 11)
id_cap_preferBinaryInside = _OID(id_cap, 1)
# CMS Attribute Map
_cmsAttributesMapUpdate = {
smimeCapabilities: SMIMECapabilities(),
id_aa_encrypKeyPref: SMIMEEncryptionKeyPreference(),
}
rfc5652.cmsAttributesMap.update(_cmsAttributesMapUpdate)
# SMIMECapabilities Attribute Map
#
# Do not include OIDs in the dictionary when the parameters are absent.
_smimeCapabilityMapUpdate = {
rc2CBC: SMIMECapabilitiesParametersForRC2CBC(),
}
smimeCapabilityMap.update(_smimeCapabilityMapUpdate)
|
