DeriveKeyPair
open override fun DeriveKeyPair(ikm: ByteArray): HPKE.KeyPair<KeyAgreementPrivateValue.ECDH, KeyAgreementPublicValue.ECDH>(source)
Deterministic algorithm to derive a key pair (skX, pkX) from the byte string ikm, where ikm SHOULD have at least Nsk bytes of entropy.