Just to be clear, you're proposing something like this? Referring to the KDF API called for in draft-irtf-cfrg-hpke-05:
config_digest = Expand(PRK=Extract("some_salt", "some_label", IKM=config),
"some_info", 16)
It's maybe more hashing than necessary, but I'd be good with this.
Chris P.
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