108 lines
3 KiB
Python
108 lines
3 KiB
Python
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#
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# This file is part of pyasn1 software.
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#
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# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
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# License: http://snmplabs.com/pyasn1/license.html
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#
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from pyasn1 import error
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from pyasn1.codec.cer import encoder
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from pyasn1.type import univ
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__all__ = ['encode']
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class SetEncoder(encoder.SetEncoder):
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@staticmethod
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def _componentSortKey(componentAndType):
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"""Sort SET components by tag
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Sort depending on the actual Choice value (dynamic sort)
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"""
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component, asn1Spec = componentAndType
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if asn1Spec is None:
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compType = component
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else:
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compType = asn1Spec
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if compType.typeId == univ.Choice.typeId and not compType.tagSet:
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if asn1Spec is None:
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return component.getComponent().tagSet
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else:
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# TODO: move out of sorting key function
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names = [namedType.name for namedType in asn1Spec.componentType.namedTypes
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if namedType.name in component]
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if len(names) != 1:
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raise error.PyAsn1Error(
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'%s components for Choice at %r' % (len(names) and 'Multiple ' or 'None ', component))
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# TODO: support nested CHOICE ordering
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return asn1Spec[names[0]].tagSet
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else:
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return compType.tagSet
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tagMap = encoder.tagMap.copy()
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tagMap.update({
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# Set & SetOf have same tags
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univ.Set.tagSet: SetEncoder()
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})
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typeMap = encoder.typeMap.copy()
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typeMap.update({
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# Set & SetOf have same tags
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univ.Set.typeId: SetEncoder()
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})
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class Encoder(encoder.Encoder):
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fixedDefLengthMode = True
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fixedChunkSize = 0
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#: Turns ASN.1 object into DER octet stream.
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#:
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#: Takes any ASN.1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
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#: walks all its components recursively and produces a DER octet stream.
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#:
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#: Parameters
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#: ----------
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#: value: either a Python or pyasn1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
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#: A Python or pyasn1 object to encode. If Python object is given, `asnSpec`
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#: parameter is required to guide the encoding process.
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#:
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#: Keyword Args
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#: ------------
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#: asn1Spec:
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#: Optional ASN.1 schema or value object e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative
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#:
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#: Returns
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#: -------
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#: : :py:class:`bytes` (Python 3) or :py:class:`str` (Python 2)
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#: Given ASN.1 object encoded into BER octet-stream
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#:
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#: Raises
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#: ------
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#: ~pyasn1.error.PyAsn1Error
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#: On encoding errors
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#:
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#: Examples
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#: --------
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#: Encode Python value into DER with ASN.1 schema
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#:
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#: .. code-block:: pycon
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#:
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#: >>> seq = SequenceOf(componentType=Integer())
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#: >>> encode([1, 2, 3], asn1Spec=seq)
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#: b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03'
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#:
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#: Encode ASN.1 value object into DER
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#:
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#: .. code-block:: pycon
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#:
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#: >>> seq = SequenceOf(componentType=Integer())
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#: >>> seq.extend([1, 2, 3])
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#: >>> encode(seq)
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#: b'0\t\x02\x01\x01\x02\x01\x02\x02\x01\x03'
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#:
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encode = Encoder(tagMap, typeMap)
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