.. _sm3gettag:



SM3GetTag
=========


Computes the current SM3 digest value of the processed part of the
message.


Syntax
------


IppStatus ippsSM3GetTag(Ipp8u\* pTag, Ipp32u tagLen, const
IppsSM3State\* pCtx);


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


``ippcp.h``


Parameters
----------


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   * -     pTag   
     -  Pointer to the authentication tag.
   * -     tagLen   
     -  Length of the tag (in bytes).
   * -     pCtx   
     -  Pointer to the IppsSM3State context.




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


The function computes the message digest based on the current context as
specified in
[`SM3 <bibliography.html>`__]. A call
to this function retains the possibility to update the digest.


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.
   * -     ippStsLengthErr   
     -  Indicates an error condition if tagLen < 1 or tagLen exceeds the maximal length of a particular digest.
   * -     ippStsContextMatchErr   
     -  Indicates an error condition if the context parameter does not match the operation.