evp_kem_init
return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE, params, authpriv);
return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE, params, NULL);
return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE, params, NULL);
return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE, params, authpub);