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.. _type.opentype:
Untyped fields of constructed types
-----------------------------------
To aid data structures flexibility, ASN.1 allows the designer to
leave incomplete field type specification in the
:ref:`Sequence <univ.Sequence>` and :ref:`Set <univ.Set>` types.
To figure out field's type at the run time, a type selector field
must accompany the open type field. The open type situation can
be captured by the :ref:`OpenType <opentype.OpenType>` object.
.. code-block:: python
algo_map = {
ObjectIdentifier('1.2.840.113549.1.1.1'): rsaEncryption(),
ObjectIdentifier('1.2.840.113549.1.1.2'): md2WithRSAEncryption()
}
class Algorithm(Sequence):
"""
Algorithm ::= SEQUENCE {
algorithm OBJECT IDENTIFIER,
parameters ANY DEFINED BY algorithm OPTIONAL
}
"""
componentType = NamedTypes(
NamedType('algorithm', ObjectIdentifier()),
OptionalNamedType('parameters', Any(),
openType=OpenType('algorithm', algo_map))
)
.. toctree::
:maxdepth: 2
/pyasn1/type/opentype/opentype
|
