A reference value provider (e.g., Firmware vendor) can provide measurements for an environment whose name it does not own (e.g., Silicon vendor-named bootloader target). If I want to get reference values for the bootloader target that are specifically from a particular signer, then CoSERV does not allow me to name that.
If I select by manifest-signer role in the entity map, then since that's optional for directly signed CoRIMs in favor of the mandatory corim-meta COSE header, then you'd need to search that as well. We don't even have a required structure for the manifest-signer, so I've opened ietf-rats-wg/draft-ietf-rats-corim#421
A reference value provider (e.g., Firmware vendor) can provide measurements for an environment whose name it does not own (e.g., Silicon vendor-named bootloader target). If I want to get reference values for the bootloader target that are specifically from a particular signer, then CoSERV does not allow me to name that.
If I select by manifest-signer role in the entity map, then since that's optional for directly signed CoRIMs in favor of the mandatory corim-meta COSE header, then you'd need to search that as well. We don't even have a required structure for the manifest-signer, so I've opened ietf-rats-wg/draft-ietf-rats-corim#421