Add P-256 variant, use HKDF-Extract instead of HKDF as the combiner KDF, and add HPKE integration section

lamps-wg / draft-composite-kem

IETF draft specifying PQC composite KEM algorithms for use in X.509 and CMS

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Add P-256 variant, use HKDF-Extract instead of HKDF as the combiner KDF, and add HPKE integration section #95

Open chris-wood opened 4 days ago

chris-wood commented 4 days ago

This will need to be modified based on #94, in particular to update the DeriveKeyPair description, but the rest of the change in this section should stand on its own.

Closes #93, #87, #86

chris-wood commented 4 days ago

@ounsworth @johngray-dev I'll revert the HKDF drop for now, replacing it with HKDF-Extract (as discussed at IETF 121), but I'd like to discuss this again in the future.