em algorithm implementation may not implement all of these functions. In order to be a consistent set of functions a provider must implement OSSL_FUNC_kem_newctx and OSSL_FUNC_kem_freectx. It must also implement both of OSSL_FUNC_kem_encapsulate_init and OSSL_FUNC_kem_encapsulate, or both of OSSL_FUNC_kem_decapsulate_init and OSSL_FUNC_kem_decapsulate. OSSL_FUNC_kem_auth_encapsulate_init is optional but if it is present then so must OSSL_FUNC_kem_auth_decapsulate_init. OSSL_FUNC_kem_get_ctx_params is option