RFE: CKA_UNWRAP_TEMPLATE Support

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
42/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
cryptography

Research direction

Start at ATTRIBUTE_TYPES and follow the packing path reached by session.generate_key with Attribute.UNWRAP_TEMPLATE. Check how nested attribute templates are represented, then add coverage for the example template and confirm that key generation no longer raises NotImplementedError.

Written by the indexing model from the issue text.

Description

enhancement

Hi!

Are you able to add support for CKA_UNWRAP_TEMPLATE?

I'd like to generate wrapping keys that cannot be used to bypass CKA_EXTRACTABLE via wrap+unwrap operations.

key = session.generate_key(pkcs11.KeyType.AES, key_length=256, label='ABC1234', store=True, template={
    pkcs11.Attribute.SENSITIVE: True,
    pkcs11.Attribute.EXTRACTABLE: False,
    pkcs11.Attribute.WRAP: True,
    pkcs11.Attribute.UNWRAP: True,
    pkcs11.Attribute.UNWRAP_TEMPLATE: {pkcs11.Attribute.EXTRACTABLE: False},
});

The above code produces:
NotImplementedError: Can't pack this Attribute.UNWRAP_TEMPLATE. Expand ATTRIBUTE_TYPES!

Thanks for the great library!

Dominant language
Python
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