KCF_PROV_ENCRYPT_MAC_INIT
rv = KCF_PROV_ENCRYPT_MAC_INIT(real_provider, ctx, &lencr_mech,
error = KCF_PROV_ENCRYPT_MAC_INIT(pd, ctx, &lencr_mech,
err = KCF_PROV_ENCRYPT_MAC_INIT(pd, ctx,