+ Generate an new SPI.\r
+ \r
+ @param[in] IkeSaSession Pointer to IKEV2_SA_SESSION related to this Child SA \r
+ Session.\r
+ @param[in, out] SpiValue Pointer to the new generated SPI value. \r
+ \r
+ @retval EFI_SUCCESS The operation performs successfully.\r
+ @retval Otherwise The operation is failed.\r