An OCSP response's signer counted as the issuer itself whenever its
certificate carried the issuer's subject name. A response naming its
responder by key hash could embed a certificate for any key with the
issuer's name copied in, skip the delegation checks, and mark a valid
certificate revoked. Whether the responder is the issuer now follows from
how it was selected (the issuer's own name or key hash); every embedded
certificate must be signed by the issuer and carry the OCSP-signing
purpose.
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