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# 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(SequenceOf):
_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
|
