The value of eat_nonce used in the examples

[s-miyazawa]

I found two cases of eat_nonce used as examples. Which one is more suitable as an example?

• h'948f8860d13a463e' (8byte)

  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_tee.diag#L4
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_iot.diag#L8
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_hw_block.diag#L9
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_hw_block2.diag#L7
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_key_store.diag#L22
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_key_store.diag#L57
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Tokens/valid_deb.diag#L37 (as part of the other binary)

• h'948f8860d13a463e8e' (9byte)

  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/valid_submods.diag#L19
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/minimal.diag#L2
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/simple.diag#L3
  • https://github.com/ietf-rats-wg/eat/blob/master/cddl/Example-Payloads/submods.diag#L2

[carl-wallace]

The two cases are equally suitable as an example. The type is defined as below (so any value between 8 and 64 bytes is suitable).

$$Claims-Set-Claims //=
    (nonce-label => nonce-type / [ 2* nonce-type ])

nonce-type = JC< tstr .size (10..74), bstr .size (8..64)>

[s-miyazawa]

Thank you for letting me know. I now know that both examples follow the definition.

I thought it would be less confusing to have all the eat_nonce in the examples identical. If necessary, I can send a pull request that makes all the eat_nonce in the examples identical (8byte data). If the change is not needed, I will close this Issue. https://github.com/ietf-rats-wg/eat/compare/master...s-miyazawa:eat:identical_nonce

[laurencelundblade]

I think it is a good idea to improve by either making the nonce exactly the same everywhere or make it totally different. Right now it's different by one byte which is weird.

[carl-wallace]

Sure. I’d break that tie by making them even more different, maybe change the outlier to be the max length with all different bytes.

From: Laurence Lundblade @.> Reply-To: ietf-rats-wg/eat @.> Date: Friday, February 10, 2023 at 9:17 PM To: ietf-rats-wg/eat @.> Cc: Carl Wallace @.>, Comment @.***> Subject: Re: [ietf-rats-wg/eat] The value of eat_nonce used in the examples (Issue #365)

I think it is a good idea to improve by either making the nonce exactly the same everywhere or make it totally different. Right now it's different by one byte which is weird.

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[laurencelundblade]

Also - my bad for making the nonces weird. Just editing accident.

[laurencelundblade]

401

[laurencelundblade]

Fixed by #401