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Add DerObject.__repr__() #735

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@James-E-A James-E-A commented May 6, 2023

The base case handles sequences and most primitives.

Special handling was given to DerOctetString and DerBitString by way of inspiration from this site — the false-positives still yield technically valid representations, and the true-positives provide tremendous utility when playing around with many real-world ASN.1 formats that nest values within octet- and bit-strings.

Special handling was required for DerNull since it takes no value, not even None, and doesn't currently accept explicit or implicit tag overrides.

This should make "playpenning" around with ASN.1-based formats a lot more convenient.

Is this something you'd be interested in merging? Do you have any feedback on it?

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To be clear, the entire _try_decode function could be discarded if dropping the nested-objects amenity. It's only used there.

The base case handles sequences and most primitives.

Special handling was required for `DerOctetString` and `DerBitString`
since they store their value at `.payload` rather than `.value`.

Special handling was required for `DerNull` since its current
constructor takes no argument at all, not even `None`.

This should make "playpenning" around with ASN.1-based formats a lot
more convenient.
@James-E-A James-E-A force-pushed the feature/derobject-repr branch from fde68eb to 639b60f Compare May 8, 2023 17:47
James Edington added 2 commits May 8, 2023 13:07
Considering that the 'else' codepath in the `DerSequence` constructor
will encode these objects automatically, this will create valid
representations.
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