Provide official test vectors

[dajiaji]

@hannestschofenig @selfissued @OR13 and other folks,

I think Orie also mentioned this in another issur/PR, but how about providing test vectors in the COSE-HPKE spec?

Since the COSE specs are referred by many IETF WGs such as SUTE, TEEP, RATS, SCITT, etc., I think it is better for the COSE WG to provide the official test vectors.

Here are my suggestions:

• Create a test-vectors repository under the cose-wg group on github (cose-wg/test-vectors).
• Create comprehensive test-vectors for COSE-HPKE spec in this repository
• Pick out a few typical ones from the repository's test-vectors and list them in the appendix in the COSE-HPKE spec with a link to the repository.

HPKE spec (RFC9180) also provides test vectors in the same manner.

What do you think?

[OR13]

I think we should do a PR to :

• https://github.com/cose-wg/Examples/blob/master/ecdsa-examples/ecdsa-01.json

under a new directory called hpke-examples

I'd recommend generating the examples from a repo that maintains an implementation, so we can regenerate them again later if needed.

Here is a similar project that uses YAML to maintain examples:

https://github.com/openwallet-foundation-labs/sd-jwt-python

An example spec file, that is used to generate examples:

• https://github.com/openwallet-foundation-labs/sd-jwt-python/blob/main/examples/simple_json_serialization/specification.yml