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FOR COMMENT, DO NOT MERGE: Add SET signing algorithm negotiation to SSF - #355

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jogu wants to merge 1 commit into
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issue-350-set-signing-alg
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jogu wants to merge 1 commit into
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issue-350-set-signing-alg

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@jogu

@jogu jogu commented Sep 24, 2026

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Adds a set_signing_alg_values_supported property to the Transmitter Configuration Metadata and a Receiver-supplied set_signing_alg property to the Stream Configuration, so a Receiver can discover which JWS algorithms a Transmitter supports and select the one used to sign SETs on a stream. Receivers are required to verify the SET alg header against the negotiated value.

This is written against the 1.0 document only to give the working group a concrete diff to review. I suggest it lands in SSF 1.1 once the 1.1 draft documents exist.

Relates to #350

Adds a `set_signing_alg_values_supported` property to the Transmitter
Configuration Metadata and a Receiver-supplied `set_signing_alg` property
to the Stream Configuration, so a Receiver can discover which JWS
algorithms a Transmitter supports and select the one used to sign SETs on
a stream. Receivers are required to verify the SET `alg` header against
the negotiated value.

This is written against the 1.0 document only to give the working group a
concrete diff to review. I suggest it lands in SSF 1.1 once the 1.1
draft documents exist.

Relates to #350

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