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[COSE] Strip signatures from COSE_Sign structures?

"Kampanakis, Panos" <kpanos@amazon.com> Fri, 20 December 2024 19:35 UTC

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From: "Kampanakis, Panos" <kpanos@amazon.com>
To: "cose@ietf.org" <cose@ietf.org>
Thread-Topic: Strip signatures from COSE_Sign structures?
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Date: Fri, 20 Dec 2024 19:35:02 +0000
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Subject: [COSE] Strip signatures from COSE_Sign structures?
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Hi COSE WG,

Pardon my COSE illiteracy, but I could not find the answer.

COSE can carry multiple signatures of the content which are validated independently. But could I take COSE legitimate content signed with SigAlgo1 and SigAlgo2, and remove the Algo2 signature structure, so that the verifier will only validate with Algo1?

CMS prevents this by a new MultipleSignatures signed attribute defined in https://www.rfc-editor.org/rfc/rfc5752 which signifies that there are more signatures for the content and thus the other signatures cannot be stripped.

I could not find if such functionality is available in COSE.

Thank you,
Panos

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