When I try to print every object available in my Smart Card with: <code class="not

struct.error: unpack requires a buffer of 1 bytes at printing objects from SmartCard about python-pkcs11 HOT 4 OPEN

pyauth commented on June 14, 2024

struct.error: unpack requires a buffer of 1 bytes at printing objects from SmartCard

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danni commented on June 14, 2024

Hi, what HSM are you using?

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asergios commented on June 14, 2024

Hi,

I am using the Portuguese Citizen Card. I can't find much information about it in English.
https://en.wikipedia.org/wiki/Citizen_Card_(Portugal)

The package overall works good with the card, that's the only error I had so far.

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asergios commented on June 14, 2024

It seems like it happens when I try to get the Public Key from my Citizen Card

obj = next(self.session.get_objects({Attribute.CLASS: ObjectClass.PUBLIC_KEY}))

If there is something I can do to help you solve this problem tell me.

The Private Keys work perfectly, the problem seems to be really on the Public Keys

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danni commented on June 14, 2024

It looks like it's failing to read attributes from the device. It's possible those attributes don't exist/return empty.

If you're willing to make a PR, you should be able to add exception handling to _unpack_attributes to handle the error.

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