gmac_mode_final
int gmac_mode_final(gcm_ctx_t *, crypto_data_t *, size_t,
rc = gmac_mode_final((gcm_ctx_t *)aes_ctx, &data,
rc = gmac_mode_final((gcm_ctx_t *)aes_ctx, &out,
ret = gmac_mode_final((gcm_ctx_t *)&aes_ctx,
ret = gmac_mode_final((gcm_ctx_t *)aes_ctx, ciphertext,
ret = gmac_mode_final((gcm_ctx_t *)aes_ctx, data,