932 lines
24 KiB
Python
932 lines
24 KiB
Python
# coding: utf-8
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"""
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ASN.1 type classes for cryptographic message syntax (CMS). Structures are also
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compatible with PKCS#7. Exports the following items:
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- AuthenticatedData()
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- AuthEnvelopedData()
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- CompressedData()
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- ContentInfo()
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- DigestedData()
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- EncryptedData()
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- EnvelopedData()
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- SignedAndEnvelopedData()
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- SignedData()
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Other type classes are defined that help compose the types listed above.
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Most CMS structures in the wild are formatted as ContentInfo encapsulating one of the other types.
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"""
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from __future__ import unicode_literals, division, absolute_import, print_function
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try:
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import zlib
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except (ImportError):
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zlib = None
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from .algos import (
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_ForceNullParameters,
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DigestAlgorithm,
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EncryptionAlgorithm,
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HmacAlgorithm,
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KdfAlgorithm,
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SignedDigestAlgorithm,
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)
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from .core import (
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Any,
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BitString,
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Choice,
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Enumerated,
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GeneralizedTime,
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Integer,
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ObjectIdentifier,
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OctetBitString,
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OctetString,
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ParsableOctetString,
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Sequence,
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SequenceOf,
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SetOf,
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UTCTime,
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UTF8String,
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)
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from .crl import CertificateList
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from .keys import PublicKeyInfo
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from .ocsp import OCSPResponse
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from .x509 import Attributes, Certificate, Extensions, GeneralName, GeneralNames, Name
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# These structures are taken from
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# ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-6.asc
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class ExtendedCertificateInfo(Sequence):
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_fields = [
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('version', Integer),
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('certificate', Certificate),
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('attributes', Attributes),
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]
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class ExtendedCertificate(Sequence):
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_fields = [
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('extended_certificate_info', ExtendedCertificateInfo),
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('signature_algorithm', SignedDigestAlgorithm),
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('signature', OctetBitString),
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]
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# These structures are taken from https://tools.ietf.org/html/rfc5652,
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# https://tools.ietf.org/html/rfc5083, http://tools.ietf.org/html/rfc2315,
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# https://tools.ietf.org/html/rfc5940, https://tools.ietf.org/html/rfc3274,
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# https://tools.ietf.org/html/rfc3281
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class CMSVersion(Integer):
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_map = {
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0: 'v0',
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1: 'v1',
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2: 'v2',
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3: 'v3',
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4: 'v4',
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5: 'v5',
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}
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class CMSAttributeType(ObjectIdentifier):
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_map = {
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'1.2.840.113549.1.9.3': 'content_type',
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'1.2.840.113549.1.9.4': 'message_digest',
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'1.2.840.113549.1.9.5': 'signing_time',
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'1.2.840.113549.1.9.6': 'counter_signature',
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# https://tools.ietf.org/html/rfc3161#page-20
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'1.2.840.113549.1.9.16.2.14': 'signature_time_stamp_token',
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# https://tools.ietf.org/html/rfc6211#page-5
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'1.2.840.113549.1.9.52': 'cms_algorithm_protection',
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}
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class Time(Choice):
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_alternatives = [
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('utc_time', UTCTime),
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('generalized_time', GeneralizedTime),
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]
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class ContentType(ObjectIdentifier):
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_map = {
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'1.2.840.113549.1.7.1': 'data',
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'1.2.840.113549.1.7.2': 'signed_data',
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'1.2.840.113549.1.7.3': 'enveloped_data',
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'1.2.840.113549.1.7.4': 'signed_and_enveloped_data',
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'1.2.840.113549.1.7.5': 'digested_data',
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'1.2.840.113549.1.7.6': 'encrypted_data',
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'1.2.840.113549.1.9.16.1.2': 'authenticated_data',
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'1.2.840.113549.1.9.16.1.9': 'compressed_data',
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'1.2.840.113549.1.9.16.1.23': 'authenticated_enveloped_data',
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}
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class CMSAlgorithmProtection(Sequence):
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_fields = [
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('digest_algorithm', DigestAlgorithm),
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('signature_algorithm', SignedDigestAlgorithm, {'implicit': 1, 'optional': True}),
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('mac_algorithm', HmacAlgorithm, {'implicit': 2, 'optional': True}),
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]
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class SetOfContentType(SetOf):
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_child_spec = ContentType
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class SetOfOctetString(SetOf):
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_child_spec = OctetString
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class SetOfTime(SetOf):
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_child_spec = Time
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class SetOfAny(SetOf):
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_child_spec = Any
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class SetOfCMSAlgorithmProtection(SetOf):
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_child_spec = CMSAlgorithmProtection
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class CMSAttribute(Sequence):
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_fields = [
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('type', CMSAttributeType),
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('values', None),
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]
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_oid_specs = {}
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def _values_spec(self):
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return self._oid_specs.get(self['type'].native, SetOfAny)
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_spec_callbacks = {
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'values': _values_spec
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}
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class CMSAttributes(SetOf):
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_child_spec = CMSAttribute
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class IssuerSerial(Sequence):
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_fields = [
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('issuer', GeneralNames),
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('serial', Integer),
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('issuer_uid', OctetBitString, {'optional': True}),
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]
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class AttCertVersion(Integer):
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_map = {
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0: 'v1',
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1: 'v2',
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}
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class AttCertSubject(Choice):
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_alternatives = [
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('base_certificate_id', IssuerSerial, {'explicit': 0}),
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('subject_name', GeneralNames, {'explicit': 1}),
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]
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class AttCertValidityPeriod(Sequence):
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_fields = [
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('not_before_time', GeneralizedTime),
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('not_after_time', GeneralizedTime),
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]
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class AttributeCertificateInfoV1(Sequence):
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_fields = [
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('version', AttCertVersion, {'default': 'v1'}),
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('subject', AttCertSubject),
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('issuer', GeneralNames),
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('signature', SignedDigestAlgorithm),
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('serial_number', Integer),
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('att_cert_validity_period', AttCertValidityPeriod),
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('attributes', Attributes),
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('issuer_unique_id', OctetBitString, {'optional': True}),
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('extensions', Extensions, {'optional': True}),
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]
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class AttributeCertificateV1(Sequence):
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_fields = [
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('ac_info', AttributeCertificateInfoV1),
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('signature_algorithm', SignedDigestAlgorithm),
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('signature', OctetBitString),
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]
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class DigestedObjectType(Enumerated):
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_map = {
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0: 'public_key',
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1: 'public_key_cert',
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2: 'other_objy_types',
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}
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class ObjectDigestInfo(Sequence):
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_fields = [
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('digested_object_type', DigestedObjectType),
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('other_object_type_id', ObjectIdentifier, {'optional': True}),
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('digest_algorithm', DigestAlgorithm),
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('object_digest', OctetBitString),
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]
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class Holder(Sequence):
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_fields = [
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('base_certificate_id', IssuerSerial, {'implicit': 0, 'optional': True}),
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('entity_name', GeneralNames, {'implicit': 1, 'optional': True}),
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('object_digest_info', ObjectDigestInfo, {'implicit': 2, 'optional': True}),
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]
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class V2Form(Sequence):
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_fields = [
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('issuer_name', GeneralNames, {'optional': True}),
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('base_certificate_id', IssuerSerial, {'explicit': 0, 'optional': True}),
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('object_digest_info', ObjectDigestInfo, {'explicit': 1, 'optional': True}),
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]
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class AttCertIssuer(Choice):
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_alternatives = [
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('v1_form', GeneralNames),
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('v2_form', V2Form, {'explicit': 0}),
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]
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class IetfAttrValue(Choice):
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_alternatives = [
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('octets', OctetString),
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('oid', ObjectIdentifier),
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('string', UTF8String),
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]
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class IetfAttrValues(SequenceOf):
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_child_spec = IetfAttrValue
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class IetfAttrSyntax(Sequence):
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_fields = [
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('policy_authority', GeneralNames, {'implicit': 0, 'optional': True}),
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('values', IetfAttrValues),
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]
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class SetOfIetfAttrSyntax(SetOf):
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_child_spec = IetfAttrSyntax
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class SvceAuthInfo(Sequence):
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_fields = [
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('service', GeneralName),
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('ident', GeneralName),
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('auth_info', OctetString, {'optional': True}),
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]
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class SetOfSvceAuthInfo(SetOf):
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_child_spec = SvceAuthInfo
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class RoleSyntax(Sequence):
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_fields = [
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('role_authority', GeneralNames, {'implicit': 0, 'optional': True}),
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('role_name', GeneralName, {'implicit': 1}),
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]
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class SetOfRoleSyntax(SetOf):
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_child_spec = RoleSyntax
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class ClassList(BitString):
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_map = {
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0: 'unmarked',
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1: 'unclassified',
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2: 'restricted',
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3: 'confidential',
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4: 'secret',
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5: 'top_secret',
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}
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class SecurityCategory(Sequence):
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_fields = [
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('type', ObjectIdentifier, {'implicit': 0}),
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('value', Any, {'implicit': 1}),
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]
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class SetOfSecurityCategory(SetOf):
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_child_spec = SecurityCategory
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class Clearance(Sequence):
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_fields = [
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('policy_id', ObjectIdentifier, {'implicit': 0}),
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('class_list', ClassList, {'implicit': 1, 'default': 'unclassified'}),
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('security_categories', SetOfSecurityCategory, {'implicit': 2, 'optional': True}),
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]
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class SetOfClearance(SetOf):
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_child_spec = Clearance
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class BigTime(Sequence):
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_fields = [
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('major', Integer),
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('fractional_seconds', Integer),
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('sign', Integer, {'optional': True}),
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]
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class LeapData(Sequence):
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_fields = [
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('leap_time', BigTime),
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('action', Integer),
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]
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class SetOfLeapData(SetOf):
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_child_spec = LeapData
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class TimingMetrics(Sequence):
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_fields = [
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('ntp_time', BigTime),
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('offset', BigTime),
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('delay', BigTime),
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('expiration', BigTime),
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('leap_event', SetOfLeapData, {'optional': True}),
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]
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class SetOfTimingMetrics(SetOf):
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_child_spec = TimingMetrics
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class TimingPolicy(Sequence):
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_fields = [
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('policy_id', SequenceOf, {'spec': ObjectIdentifier}),
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('max_offset', BigTime, {'explicit': 0, 'optional': True}),
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('max_delay', BigTime, {'explicit': 1, 'optional': True}),
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]
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class SetOfTimingPolicy(SetOf):
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_child_spec = TimingPolicy
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class AttCertAttributeType(ObjectIdentifier):
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_map = {
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'1.3.6.1.5.5.7.10.1': 'authentication_info',
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'1.3.6.1.5.5.7.10.2': 'access_identity',
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'1.3.6.1.5.5.7.10.3': 'charging_identity',
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'1.3.6.1.5.5.7.10.4': 'group',
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'2.5.4.72': 'role',
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'2.5.4.55': 'clearance',
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'1.3.6.1.4.1.601.10.4.1': 'timing_metrics',
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'1.3.6.1.4.1.601.10.4.2': 'timing_policy',
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}
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class AttCertAttribute(Sequence):
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_fields = [
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('type', AttCertAttributeType),
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('values', None),
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]
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_oid_specs = {
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'authentication_info': SetOfSvceAuthInfo,
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'access_identity': SetOfSvceAuthInfo,
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'charging_identity': SetOfIetfAttrSyntax,
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'group': SetOfIetfAttrSyntax,
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'role': SetOfRoleSyntax,
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'clearance': SetOfClearance,
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'timing_metrics': SetOfTimingMetrics,
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'timing_policy': SetOfTimingPolicy,
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}
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def _values_spec(self):
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return self._oid_specs.get(self['type'].native, SetOfAny)
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_spec_callbacks = {
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'values': _values_spec
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}
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class AttCertAttributes(SequenceOf):
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_child_spec = AttCertAttribute
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class AttributeCertificateInfoV2(Sequence):
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_fields = [
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('version', AttCertVersion),
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('holder', Holder),
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('issuer', AttCertIssuer),
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('signature', SignedDigestAlgorithm),
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('serial_number', Integer),
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('att_cert_validity_period', AttCertValidityPeriod),
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('attributes', AttCertAttributes),
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('issuer_unique_id', OctetBitString, {'optional': True}),
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('extensions', Extensions, {'optional': True}),
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]
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class AttributeCertificateV2(Sequence):
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# Handle the situation where a V2 cert is encoded as V1
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_bad_tag = 1
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_fields = [
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('ac_info', AttributeCertificateInfoV2),
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('signature_algorithm', SignedDigestAlgorithm),
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('signature', OctetBitString),
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]
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class OtherCertificateFormat(Sequence):
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_fields = [
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('other_cert_format', ObjectIdentifier),
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('other_cert', Any),
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]
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class CertificateChoices(Choice):
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_alternatives = [
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('certificate', Certificate),
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('extended_certificate', ExtendedCertificate, {'implicit': 0}),
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('v1_attr_cert', AttributeCertificateV1, {'implicit': 1}),
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('v2_attr_cert', AttributeCertificateV2, {'implicit': 2}),
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('other', OtherCertificateFormat, {'implicit': 3}),
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]
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def validate(self, class_, tag, contents):
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"""
|
|
Ensures that the class and tag specified exist as an alternative. This
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custom version fixes parsing broken encodings there a V2 attribute
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# certificate is encoded as a V1
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|
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:param class_:
|
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The integer class_ from the encoded value header
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|
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:param tag:
|
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The integer tag from the encoded value header
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:param contents:
|
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A byte string of the contents of the value - used when the object
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is explicitly tagged
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:raises:
|
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ValueError - when value is not a valid alternative
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"""
|
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|
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super(CertificateChoices, self).validate(class_, tag, contents)
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if self._choice == 2:
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if AttCertVersion.load(Sequence.load(contents)[0].dump()).native == 'v2':
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self._choice = 3
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class CertificateSet(SetOf):
|
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_child_spec = CertificateChoices
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|
|
|
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class ContentInfo(Sequence):
|
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_fields = [
|
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('content_type', ContentType),
|
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('content', Any, {'explicit': 0, 'optional': True}),
|
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]
|
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|
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_oid_pair = ('content_type', 'content')
|
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_oid_specs = {}
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|
|
|
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class SetOfContentInfo(SetOf):
|
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_child_spec = ContentInfo
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|
|
|
|
class EncapsulatedContentInfo(Sequence):
|
|
_fields = [
|
|
('content_type', ContentType),
|
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('content', ParsableOctetString, {'explicit': 0, 'optional': True}),
|
|
]
|
|
|
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_oid_pair = ('content_type', 'content')
|
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_oid_specs = {}
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|
|
|
|
|
class IssuerAndSerialNumber(Sequence):
|
|
_fields = [
|
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('issuer', Name),
|
|
('serial_number', Integer),
|
|
]
|
|
|
|
|
|
class SignerIdentifier(Choice):
|
|
_alternatives = [
|
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('issuer_and_serial_number', IssuerAndSerialNumber),
|
|
('subject_key_identifier', OctetString, {'implicit': 0}),
|
|
]
|
|
|
|
|
|
class DigestAlgorithms(SetOf):
|
|
_child_spec = DigestAlgorithm
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|
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class CertificateRevocationLists(SetOf):
|
|
_child_spec = CertificateList
|
|
|
|
|
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class SCVPReqRes(Sequence):
|
|
_fields = [
|
|
('request', ContentInfo, {'explicit': 0, 'optional': True}),
|
|
('response', ContentInfo),
|
|
]
|
|
|
|
|
|
class OtherRevInfoFormatId(ObjectIdentifier):
|
|
_map = {
|
|
'1.3.6.1.5.5.7.16.2': 'ocsp_response',
|
|
'1.3.6.1.5.5.7.16.4': 'scvp',
|
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}
|
|
|
|
|
|
class OtherRevocationInfoFormat(Sequence):
|
|
_fields = [
|
|
('other_rev_info_format', OtherRevInfoFormatId),
|
|
('other_rev_info', Any),
|
|
]
|
|
|
|
_oid_pair = ('other_rev_info_format', 'other_rev_info')
|
|
_oid_specs = {
|
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'ocsp_response': OCSPResponse,
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'scvp': SCVPReqRes,
|
|
}
|
|
|
|
|
|
class RevocationInfoChoice(Choice):
|
|
_alternatives = [
|
|
('crl', CertificateList),
|
|
('other', OtherRevocationInfoFormat, {'implicit': 1}),
|
|
]
|
|
|
|
|
|
class RevocationInfoChoices(SetOf):
|
|
_child_spec = RevocationInfoChoice
|
|
|
|
|
|
class SignerInfo(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('sid', SignerIdentifier),
|
|
('digest_algorithm', DigestAlgorithm),
|
|
('signed_attrs', CMSAttributes, {'implicit': 0, 'optional': True}),
|
|
('signature_algorithm', SignedDigestAlgorithm),
|
|
('signature', OctetString),
|
|
('unsigned_attrs', CMSAttributes, {'implicit': 1, 'optional': True}),
|
|
]
|
|
|
|
|
|
class SignerInfos(SetOf):
|
|
_child_spec = SignerInfo
|
|
|
|
|
|
class SignedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('digest_algorithms', DigestAlgorithms),
|
|
('encap_content_info', None),
|
|
('certificates', CertificateSet, {'implicit': 0, 'optional': True}),
|
|
('crls', RevocationInfoChoices, {'implicit': 1, 'optional': True}),
|
|
('signer_infos', SignerInfos),
|
|
]
|
|
|
|
def _encap_content_info_spec(self):
|
|
# If the encap_content_info is version v1, then this could be a PKCS#7
|
|
# structure, or a CMS structure. CMS wraps the encoded value in an
|
|
# Octet String tag.
|
|
|
|
# If the version is greater than 1, it is definite CMS
|
|
if self['version'].native != 'v1':
|
|
return EncapsulatedContentInfo
|
|
|
|
# Otherwise, the ContentInfo spec from PKCS#7 will be compatible with
|
|
# CMS v1 (which only allows Data, an Octet String) and PKCS#7, which
|
|
# allows Any
|
|
return ContentInfo
|
|
|
|
_spec_callbacks = {
|
|
'encap_content_info': _encap_content_info_spec
|
|
}
|
|
|
|
|
|
class OriginatorInfo(Sequence):
|
|
_fields = [
|
|
('certs', CertificateSet, {'implicit': 0, 'optional': True}),
|
|
('crls', RevocationInfoChoices, {'implicit': 1, 'optional': True}),
|
|
]
|
|
|
|
|
|
class RecipientIdentifier(Choice):
|
|
_alternatives = [
|
|
('issuer_and_serial_number', IssuerAndSerialNumber),
|
|
('subject_key_identifier', OctetString, {'implicit': 0}),
|
|
]
|
|
|
|
|
|
class KeyEncryptionAlgorithmId(ObjectIdentifier):
|
|
_map = {
|
|
'1.2.840.113549.1.1.1': 'rsa',
|
|
'2.16.840.1.101.3.4.1.5': 'aes128_wrap',
|
|
'2.16.840.1.101.3.4.1.8': 'aes128_wrap_pad',
|
|
'2.16.840.1.101.3.4.1.25': 'aes192_wrap',
|
|
'2.16.840.1.101.3.4.1.28': 'aes192_wrap_pad',
|
|
'2.16.840.1.101.3.4.1.45': 'aes256_wrap',
|
|
'2.16.840.1.101.3.4.1.48': 'aes256_wrap_pad',
|
|
}
|
|
|
|
|
|
class KeyEncryptionAlgorithm(_ForceNullParameters, Sequence):
|
|
_fields = [
|
|
('algorithm', KeyEncryptionAlgorithmId),
|
|
('parameters', Any, {'optional': True}),
|
|
]
|
|
|
|
|
|
class KeyTransRecipientInfo(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('rid', RecipientIdentifier),
|
|
('key_encryption_algorithm', KeyEncryptionAlgorithm),
|
|
('encrypted_key', OctetString),
|
|
]
|
|
|
|
|
|
class OriginatorIdentifierOrKey(Choice):
|
|
_alternatives = [
|
|
('issuer_and_serial_number', IssuerAndSerialNumber),
|
|
('subject_key_identifier', OctetString, {'implicit': 0}),
|
|
('originator_key', PublicKeyInfo, {'implicit': 1}),
|
|
]
|
|
|
|
|
|
class OtherKeyAttribute(Sequence):
|
|
_fields = [
|
|
('key_attr_id', ObjectIdentifier),
|
|
('key_attr', Any),
|
|
]
|
|
|
|
|
|
class RecipientKeyIdentifier(Sequence):
|
|
_fields = [
|
|
('subject_key_identifier', OctetString),
|
|
('date', GeneralizedTime, {'optional': True}),
|
|
('other', OtherKeyAttribute, {'optional': True}),
|
|
]
|
|
|
|
|
|
class KeyAgreementRecipientIdentifier(Choice):
|
|
_alternatives = [
|
|
('issuer_and_serial_number', IssuerAndSerialNumber),
|
|
('r_key_id', RecipientKeyIdentifier, {'implicit': 0}),
|
|
]
|
|
|
|
|
|
class RecipientEncryptedKey(Sequence):
|
|
_fields = [
|
|
('rid', KeyAgreementRecipientIdentifier),
|
|
('encrypted_key', OctetString),
|
|
]
|
|
|
|
|
|
class RecipientEncryptedKeys(SequenceOf):
|
|
_child_spec = RecipientEncryptedKey
|
|
|
|
|
|
class KeyAgreeRecipientInfo(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('originator', OriginatorIdentifierOrKey, {'explicit': 0}),
|
|
('ukm', OctetString, {'explicit': 1, 'optional': True}),
|
|
('key_encryption_algorithm', KeyEncryptionAlgorithm),
|
|
('recipient_encrypted_keys', RecipientEncryptedKeys),
|
|
]
|
|
|
|
|
|
class KEKIdentifier(Sequence):
|
|
_fields = [
|
|
('key_identifier', OctetString),
|
|
('date', GeneralizedTime, {'optional': True}),
|
|
('other', OtherKeyAttribute, {'optional': True}),
|
|
]
|
|
|
|
|
|
class KEKRecipientInfo(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('kekid', KEKIdentifier),
|
|
('key_encryption_algorithm', KeyEncryptionAlgorithm),
|
|
('encrypted_key', OctetString),
|
|
]
|
|
|
|
|
|
class PasswordRecipientInfo(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('key_derivation_algorithm', KdfAlgorithm, {'implicit': 0, 'optional': True}),
|
|
('key_encryption_algorithm', KeyEncryptionAlgorithm),
|
|
('encrypted_key', OctetString),
|
|
]
|
|
|
|
|
|
class OtherRecipientInfo(Sequence):
|
|
_fields = [
|
|
('ori_type', ObjectIdentifier),
|
|
('ori_value', Any),
|
|
]
|
|
|
|
|
|
class RecipientInfo(Choice):
|
|
_alternatives = [
|
|
('ktri', KeyTransRecipientInfo),
|
|
('kari', KeyAgreeRecipientInfo, {'implicit': 1}),
|
|
('kekri', KEKRecipientInfo, {'implicit': 2}),
|
|
('pwri', PasswordRecipientInfo, {'implicit': 3}),
|
|
('ori', OtherRecipientInfo, {'implicit': 4}),
|
|
]
|
|
|
|
|
|
class RecipientInfos(SetOf):
|
|
_child_spec = RecipientInfo
|
|
|
|
|
|
class EncryptedContentInfo(Sequence):
|
|
_fields = [
|
|
('content_type', ContentType),
|
|
('content_encryption_algorithm', EncryptionAlgorithm),
|
|
('encrypted_content', OctetString, {'implicit': 0, 'optional': True}),
|
|
]
|
|
|
|
|
|
class EnvelopedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('originator_info', OriginatorInfo, {'implicit': 0, 'optional': True}),
|
|
('recipient_infos', RecipientInfos),
|
|
('encrypted_content_info', EncryptedContentInfo),
|
|
('unprotected_attrs', CMSAttributes, {'implicit': 1, 'optional': True}),
|
|
]
|
|
|
|
|
|
class SignedAndEnvelopedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('recipient_infos', RecipientInfos),
|
|
('digest_algorithms', DigestAlgorithms),
|
|
('encrypted_content_info', EncryptedContentInfo),
|
|
('certificates', CertificateSet, {'implicit': 0, 'optional': True}),
|
|
('crls', CertificateRevocationLists, {'implicit': 1, 'optional': True}),
|
|
('signer_infos', SignerInfos),
|
|
]
|
|
|
|
|
|
class DigestedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('digest_algorithm', DigestAlgorithm),
|
|
('encap_content_info', None),
|
|
('digest', OctetString),
|
|
]
|
|
|
|
def _encap_content_info_spec(self):
|
|
# If the encap_content_info is version v1, then this could be a PKCS#7
|
|
# structure, or a CMS structure. CMS wraps the encoded value in an
|
|
# Octet String tag.
|
|
|
|
# If the version is greater than 1, it is definite CMS
|
|
if self['version'].native != 'v1':
|
|
return EncapsulatedContentInfo
|
|
|
|
# Otherwise, the ContentInfo spec from PKCS#7 will be compatible with
|
|
# CMS v1 (which only allows Data, an Octet String) and PKCS#7, which
|
|
# allows Any
|
|
return ContentInfo
|
|
|
|
_spec_callbacks = {
|
|
'encap_content_info': _encap_content_info_spec
|
|
}
|
|
|
|
|
|
class EncryptedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('encrypted_content_info', EncryptedContentInfo),
|
|
('unprotected_attrs', CMSAttributes, {'implicit': 1, 'optional': True}),
|
|
]
|
|
|
|
|
|
class AuthenticatedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('originator_info', OriginatorInfo, {'implicit': 0, 'optional': True}),
|
|
('recipient_infos', RecipientInfos),
|
|
('mac_algorithm', HmacAlgorithm),
|
|
('digest_algorithm', DigestAlgorithm, {'implicit': 1, 'optional': True}),
|
|
# This does not require the _spec_callbacks approach of SignedData and
|
|
# DigestedData since AuthenticatedData was not part of PKCS#7
|
|
('encap_content_info', EncapsulatedContentInfo),
|
|
('auth_attrs', CMSAttributes, {'implicit': 2, 'optional': True}),
|
|
('mac', OctetString),
|
|
('unauth_attrs', CMSAttributes, {'implicit': 3, 'optional': True}),
|
|
]
|
|
|
|
|
|
class AuthEnvelopedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('originator_info', OriginatorInfo, {'implicit': 0, 'optional': True}),
|
|
('recipient_infos', RecipientInfos),
|
|
('auth_encrypted_content_info', EncryptedContentInfo),
|
|
('auth_attrs', CMSAttributes, {'implicit': 1, 'optional': True}),
|
|
('mac', OctetString),
|
|
('unauth_attrs', CMSAttributes, {'implicit': 2, 'optional': True}),
|
|
]
|
|
|
|
|
|
class CompressionAlgorithmId(ObjectIdentifier):
|
|
_map = {
|
|
'1.2.840.113549.1.9.16.3.8': 'zlib',
|
|
}
|
|
|
|
|
|
class CompressionAlgorithm(Sequence):
|
|
_fields = [
|
|
('algorithm', CompressionAlgorithmId),
|
|
('parameters', Any, {'optional': True}),
|
|
]
|
|
|
|
|
|
class CompressedData(Sequence):
|
|
_fields = [
|
|
('version', CMSVersion),
|
|
('compression_algorithm', CompressionAlgorithm),
|
|
('encap_content_info', EncapsulatedContentInfo),
|
|
]
|
|
|
|
_decompressed = None
|
|
|
|
@property
|
|
def decompressed(self):
|
|
if self._decompressed is None:
|
|
if zlib is None:
|
|
raise SystemError('The zlib module is not available')
|
|
self._decompressed = zlib.decompress(self['encap_content_info']['content'].native)
|
|
return self._decompressed
|
|
|
|
|
|
ContentInfo._oid_specs = {
|
|
'data': OctetString,
|
|
'signed_data': SignedData,
|
|
'enveloped_data': EnvelopedData,
|
|
'signed_and_enveloped_data': SignedAndEnvelopedData,
|
|
'digested_data': DigestedData,
|
|
'encrypted_data': EncryptedData,
|
|
'authenticated_data': AuthenticatedData,
|
|
'compressed_data': CompressedData,
|
|
'authenticated_enveloped_data': AuthEnvelopedData,
|
|
}
|
|
|
|
|
|
EncapsulatedContentInfo._oid_specs = {
|
|
'signed_data': SignedData,
|
|
'enveloped_data': EnvelopedData,
|
|
'signed_and_enveloped_data': SignedAndEnvelopedData,
|
|
'digested_data': DigestedData,
|
|
'encrypted_data': EncryptedData,
|
|
'authenticated_data': AuthenticatedData,
|
|
'compressed_data': CompressedData,
|
|
'authenticated_enveloped_data': AuthEnvelopedData,
|
|
}
|
|
|
|
|
|
CMSAttribute._oid_specs = {
|
|
'content_type': SetOfContentType,
|
|
'message_digest': SetOfOctetString,
|
|
'signing_time': SetOfTime,
|
|
'counter_signature': SignerInfos,
|
|
'signature_time_stamp_token': SetOfContentInfo,
|
|
'cms_algorithm_protection': SetOfCMSAlgorithmProtection,
|
|
}
|