FIPS KAS requires use of ECC CDH.
The EC 'B' and 'K' curves have a cofactor that is not 1, and this
MUST be multiplied by the private key when deriving the shared secret.
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25139)