✏ 编辑: tsp.py

# coding: utf-8

"""
ASN.1 type classes for the time stamp protocol (TSP). Exports the following
items:

- TimeStampReq()
 - TimeStampResp()

Also adds TimeStampedData() support to asn1crypto.cms.ContentInfo(),
TimeStampedData() and TSTInfo() support to
asn1crypto.cms.EncapsulatedContentInfo() and some oids and value parsers to
asn1crypto.cms.CMSAttribute().

Other type classes are defined that help compose the types listed above.
"""

from __future__ import unicode_literals, division, absolute_import, print_function

from .algos import DigestAlgorithm
from .cms import (
    CMSAttribute,
    CMSAttributeType,
    ContentInfo,
    ContentType,
    EncapsulatedContentInfo,
)
from .core import (
    Any,
    BitString,
    Boolean,
    Choice,
    GeneralizedTime,
    IA5String,
    Integer,
    ObjectIdentifier,
    OctetString,
    Sequence,
    SequenceOf,
    SetOf,
    UTF8String,
)
from .crl import CertificateList
from .x509 import (
    Attributes,
    CertificatePolicies,
    GeneralName,
    GeneralNames,
)

# The structures in this file are based on https://tools.ietf.org/html/rfc3161,
# https://tools.ietf.org/html/rfc4998, https://tools.ietf.org/html/rfc5544,
# https://tools.ietf.org/html/rfc5035, https://tools.ietf.org/html/rfc2634

class Version(Integer):
    _map = {
        0: 'v0',
        1: 'v1',
        2: 'v2',
        3: 'v3',
        4: 'v4',
        5: 'v5',
    }

class MessageImprint(Sequence):
    _fields = [
        ('hash_algorithm', DigestAlgorithm),
        ('hashed_message', OctetString),
    ]

class Accuracy(Sequence):
    _fields = [
        ('seconds', Integer, {'optional': True}),
        ('millis', Integer, {'implicit': 0, 'optional': True}),
        ('micros', Integer, {'implicit': 1, 'optional': True}),
    ]

class Extension(Sequence):
    _fields = [
        ('extn_id', ObjectIdentifier),
        ('critical', Boolean, {'default': False}),
        ('extn_value', OctetString),
    ]

class Extensions(SequenceOf):
    _child_spec = Extension

class TSTInfo(Sequence):
    _fields = [
        ('version', Version),
        ('policy', ObjectIdentifier),
        ('message_imprint', MessageImprint),
        ('serial_number', Integer),
        ('gen_time', GeneralizedTime),
        ('accuracy', Accuracy, {'optional': True}),
        ('ordering', Boolean, {'default': False}),
        ('nonce', Integer, {'optional': True}),
        ('tsa', GeneralName, {'explicit': 0, 'optional': True}),
        ('extensions', Extensions, {'implicit': 1, 'optional': True}),
    ]

class TimeStampReq(Sequence):
    _fields = [
        ('version', Version),
        ('message_imprint', MessageImprint),
        ('req_policy', ObjectIdentifier, {'optional': True}),
        ('nonce', Integer, {'optional': True}),
        ('cert_req', Boolean, {'default': False}),
        ('extensions', Extensions, {'implicit': 0, 'optional': True}),
    ]

class PKIStatus(Integer):
    _map = {
        0: 'granted',
        1: 'granted_with_mods',
        2: 'rejection',
        3: 'waiting',
        4: 'revocation_warning',
        5: 'revocation_notification',
    }

class PKIFreeText(SequenceOf):
    _child_spec = UTF8String

class PKIFailureInfo(BitString):
    _map = {
        0: 'bad_alg',
        2: 'bad_request',
        5: 'bad_data_format',
        14: 'time_not_available',
        15: 'unaccepted_policy',
        16: 'unaccepted_extensions',
        17: 'add_info_not_available',
        25: 'system_failure',
    }

class PKIStatusInfo(Sequence):
    _fields = [
        ('status', PKIStatus),
        ('status_string', PKIFreeText, {'optional': True}),
        ('fail_info', PKIFailureInfo, {'optional': True}),
    ]

class TimeStampResp(Sequence):
    _fields = [
        ('status', PKIStatusInfo),
        ('time_stamp_token', ContentInfo),
    ]

class MetaData(Sequence):
    _fields = [
        ('hash_protected', Boolean),
        ('file_name', UTF8String, {'optional': True}),
        ('media_type', IA5String, {'optional': True}),
        ('other_meta_data', Attributes, {'optional': True}),
    ]

class TimeStampAndCRL(Sequence):
    _fields = [
        ('time_stamp', EncapsulatedContentInfo),
        ('crl', CertificateList, {'optional': True}),
    ]

class TimeStampTokenEvidence(SequenceOf):
    _child_spec = TimeStampAndCRL

class DigestAlgorithms(SequenceOf):
    _child_spec = DigestAlgorithm

class EncryptionInfo(Sequence):
    _fields = [
        ('encryption_info_type', ObjectIdentifier),
        ('encryption_info_value', Any),
    ]

class PartialHashtree(SequenceOf):
    _child_spec = OctetString

class PartialHashtrees(SequenceOf):
    _child_spec = PartialHashtree

class ArchiveTimeStamp(Sequence):
    _fields = [
        ('digest_algorithm', DigestAlgorithm, {'implicit': 0, 'optional': True}),
        ('attributes', Attributes, {'implicit': 1, 'optional': True}),
        ('reduced_hashtree', PartialHashtrees, {'implicit': 2, 'optional': True}),
        ('time_stamp', ContentInfo),
    ]

class ArchiveTimeStampSequence(SequenceOf):
    _child_spec = ArchiveTimeStamp

class EvidenceRecord(Sequence):
    _fields = [
        ('version', Version),
        ('digest_algorithms', DigestAlgorithms),
        ('crypto_infos', Attributes, {'implicit': 0, 'optional': True}),
        ('encryption_info', EncryptionInfo, {'implicit': 1, 'optional': True}),
        ('archive_time_stamp_sequence', ArchiveTimeStampSequence),
    ]

class OtherEvidence(Sequence):
    _fields = [
        ('oe_type', ObjectIdentifier),
        ('oe_value', Any),
    ]

class Evidence(Choice):
    _alternatives = [
        ('tst_evidence', TimeStampTokenEvidence, {'implicit': 0}),
        ('ers_evidence', EvidenceRecord, {'implicit': 1}),
        ('other_evidence', OtherEvidence, {'implicit': 2}),
    ]

class TimeStampedData(Sequence):
    _fields = [
        ('version', Version),
        ('data_uri', IA5String, {'optional': True}),
        ('meta_data', MetaData, {'optional': True}),
        ('content', OctetString, {'optional': True}),
        ('temporal_evidence', Evidence),
    ]

class IssuerSerial(Sequence):
    _fields = [
        ('issuer', GeneralNames),
        ('serial_number', Integer),
    ]

class ESSCertID(Sequence):
    _fields = [
        ('cert_hash', OctetString),
        ('issuer_serial', IssuerSerial, {'optional': True}),
    ]

class ESSCertIDs(SequenceOf):
    _child_spec = ESSCertID

class SigningCertificate(Sequence):
    _fields = [
        ('certs', ESSCertIDs),
        ('policies', CertificatePolicies, {'optional': True}),
    ]

class SetOfSigningCertificates(SetOf):
    _child_spec = SigningCertificate

class ESSCertIDv2(Sequence):
    _fields = [
        ('hash_algorithm', DigestAlgorithm, {'default': {'algorithm': 'sha256'}}),
        ('cert_hash', OctetString),
        ('issuer_serial', IssuerSerial, {'optional': True}),
    ]

class ESSCertIDv2s(SequenceOf):
    _child_spec = ESSCertIDv2

class SigningCertificateV2(Sequence):
    _fields = [
        ('certs', ESSCertIDv2s),
        ('policies', CertificatePolicies, {'optional': True}),
    ]

class SetOfSigningCertificatesV2(SetOf):
    _child_spec = SigningCertificateV2

EncapsulatedContentInfo._oid_specs['tst_info'] = TSTInfo
EncapsulatedContentInfo._oid_specs['timestamped_data'] = TimeStampedData
ContentInfo._oid_specs['timestamped_data'] = TimeStampedData
ContentType._map['1.2.840.113549.1.9.16.1.4'] = 'tst_info'
ContentType._map['1.2.840.113549.1.9.16.1.31'] = 'timestamped_data'
CMSAttributeType._map['1.2.840.113549.1.9.16.2.12'] = 'signing_certificate'
CMSAttribute._oid_specs['signing_certificate'] = SetOfSigningCertificates
CMSAttributeType._map['1.2.840.113549.1.9.16.2.47'] = 'signing_certificate_v2'
CMSAttribute._oid_specs['signing_certificate_v2'] = SetOfSigningCertificatesV2

[X] 取消