.. _sm3pack-sm3unpack:




SM3Pack, SM3Unpack
==================


Packs/unpacks the IppsSM3State context into/from a user-defined buffer.


Syntax
------


IppStatus ippsSM3Pack (const IppsSM3State\* pCtx, Ipp8u\* pBuffer);


IppStatus ippsSM3Unpack (const Ipp8u\* pBuffer, IppsSM3State\* pCtx);


Include Files
-------------

``ippcp.h``


Parameters
----------


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   :header-rows: 0

   * -     pCtx   
     -  Pointer to the IppsSM3State context.
   * -     pBuffer   
     -  Pointer to the user-defined buffer.




Description
-----------


The SM3Pack function transforms the \*pCtx context to a
position-independent form and stores it in the \*pBuffer buffer. The
SM3Unpack function performs the inverse operation, that is, transforms
the contents of the \*pBuffer buffer into a normal IppsSM3State context.
The SM3Pack and SM3Unpack functions enable replacing the
position-dependent IppsSM3State context in the memory.


Call the
`SM3GetSize <md5getsize.html>`__
function prior to SM3Pack/SM3Unpack to determine the size of the buffer.


Return Values
-------------


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   :header-rows: 0

   * -     ippStsNoErr   
     -  Indicates no error. Any other value indicates an error or warning.
   * -     ippStsNullPtrErr   
     -  Indicates an error condition if any of the specified pointers is NULL.
   * -     ippStsContextMatchErr   
     -  Indicates an error condition if the context parameter does not match the operation.