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__init__.py
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decoder.py
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encoder.py
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Editing: decoder.py
# # This file is part of pyasn1 software. # # Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com> # License: https://pyasn1.readthedocs.io/en/latest/license.html # import warnings from pyasn1.codec.cer import decoder from pyasn1.type import univ __all__ = ['decode', 'StreamingDecoder'] class BitStringPayloadDecoder(decoder.BitStringPayloadDecoder): supportConstructedForm = False class OctetStringPayloadDecoder(decoder.OctetStringPayloadDecoder): supportConstructedForm = False # TODO: prohibit non-canonical encoding RealPayloadDecoder = decoder.RealPayloadDecoder TAG_MAP = decoder.TAG_MAP.copy() TAG_MAP.update( {univ.BitString.tagSet: BitStringPayloadDecoder(), univ.OctetString.tagSet: OctetStringPayloadDecoder(), univ.Real.tagSet: RealPayloadDecoder()} ) TYPE_MAP = decoder.TYPE_MAP.copy() # Put in non-ambiguous types for faster codec lookup for typeDecoder in TAG_MAP.values(): if typeDecoder.protoComponent is not None: typeId = typeDecoder.protoComponent.__class__.typeId if typeId is not None and typeId not in TYPE_MAP: TYPE_MAP[typeId] = typeDecoder class SingleItemDecoder(decoder.SingleItemDecoder): __doc__ = decoder.SingleItemDecoder.__doc__ TAG_MAP = TAG_MAP TYPE_MAP = TYPE_MAP supportIndefLength = False class StreamingDecoder(decoder.StreamingDecoder): __doc__ = decoder.StreamingDecoder.__doc__ SINGLE_ITEM_DECODER = SingleItemDecoder class Decoder(decoder.Decoder): __doc__ = decoder.Decoder.__doc__ STREAMING_DECODER = StreamingDecoder #: Turns DER octet stream into an ASN.1 object. #: #: Takes DER octet-stream and decode it into an ASN.1 object #: (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative) which #: may be a scalar or an arbitrary nested structure. #: #: Parameters #: ---------- #: substrate: :py:class:`bytes` #: DER octet-stream #: #: Keyword Args #: ------------ #: asn1Spec: any pyasn1 type object e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative #: A pyasn1 type object to act as a template guiding the decoder. Depending on the ASN.1 structure #: being decoded, *asn1Spec* may or may not be required. Most common reason for #: it to require is that ASN.1 structure is encoded in *IMPLICIT* tagging mode. #: #: Returns #: ------- #: : :py:class:`tuple` #: A tuple of pyasn1 object recovered from DER substrate (:py:class:`~pyasn1.type.base.PyAsn1Item` derivative) #: and the unprocessed trailing portion of the *substrate* (may be empty) #: #: Raises #: ------ #: ~pyasn1.error.PyAsn1Error, ~pyasn1.error.SubstrateUnderrunError #: On decoding errors #: #: Examples #: -------- #: Decode DER serialisation without ASN.1 schema #: #: .. code-block:: pycon #: #: >>> s, _ = decode(b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03') #: >>> str(s) #: SequenceOf: #: 1 2 3 #: #: Decode DER serialisation with ASN.1 schema #: #: .. code-block:: pycon #: #: >>> seq = SequenceOf(componentType=Integer()) #: >>> s, _ = decode(b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03', asn1Spec=seq) #: >>> str(s) #: SequenceOf: #: 1 2 3 #: decode = Decoder() def __getattr__(attr: str): if newAttr := {"tagMap": "TAG_MAP", "typeMap": "TYPE_MAP"}.get(attr): warnings.warn(f"{attr} is deprecated. Please use {newAttr} instead.", DeprecationWarning) return globals()[newAttr] raise AttributeError(attr)
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