Sign over the key handle, not info_sub, in HMAC-adapted KEM #21
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Discovered while testing a prototype implementation - the MAC is computed over the domain separation tags, not the KEM ciphertext. Not sure what I was thinking when I initially wrote that in 52b738e - the initial commit 139af55 has the MAC sign over both the ciphertext and the DST.
The DSTs are still mixed into the MAC since they are part of the derivation of the MAC key.