NAME
   GenerateMac,
   CSSM_GenerateMac,
   CSP_GenerateMac  - Compute a message authentication code (CDSA)

 SYNOPSIS
   # include <cssm.h>

    API:
        CSSM_RETURN CSSMAPI CSSM_GenerateMac
        (CSSM_CC_HANDLE CCHandle,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_DATA_PTR Mac)
    SPI:
        CSSM_RETURN CSSMCSPI CSP_GenerateMac
        (CSSM_CSP_HANDLE CSPHandle,
        CSSM_CC_HANDLE CCHandle,
        const CSSM_CONTEXT *Context,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_DATA_PTR Mac)

 LIBRARY
   Common Security Services Manager library (CDSA$INCSSM300_SHR.EXE)

 API PARAMETERS
   CCHandle (input)
           The handle that describes the context of this cryptographic
           operation used to link to the CSP-managed information.

   DataBufs (input)
           A pointer to a vector of CSSM_DATA structures that contain
           the data to be operated on.

   DataBufCount (input)
           The number of DataBufs.

   Mac (output)
           A pointer to the CSSM_DATA structure for the Message
           Authentication Code.

 SPI PARAMETERS
   CSPHandle (input)
           The handle that describes the add-in cryptographic service
           provider module used to perform calls to CSSM for the memory
           functions managed by CSSM.

   Context (input)
           Pointer to CSSM_CONTEXT structure that describes the
           attributes with this context.

 DESCRIPTION
   This function computes a message authentication code for all data
   contained in the set of input buffers.

 NOTES ON API
   The output is returned to the caller either by filling the caller-
   specified buffer or by using the application's declared memory
   allocation functions to allocate buffer space. To specify a specific,
   preallocated output buffer, the caller must provide an array of one
   or more CSSM_DATA structures, each containing a Length field value
   greater than zero and a non-NULL data pointer field value. To specify
   automatic output buffer allocation by the CSP, the caller must
   provide an array of one or more CSSM_DATA structures, each containing
   a Length field value equal to zero and a NULL data pointer field
   value. The application is always responsible for deallocating the
   memory when it is no longer needed.

 NOTES ON SPI
   The output is returned to the caller as specified in  Buffer
   Management for Cryptographic Services.

 RETURN VALUE
   A CSSM_RETURN value indicating success or specifying a particular
   error condition. The value CSSM_OK indicates success. All other
   values represent an error condition.

 ERRORS
   Errors are described in the CDSA technical standard.  See CDSA.

        CSSMERR_CSP_OUTPUT_LENGTH_ERROR

 SEE ALSO
   Books

   Intel CDSA Application Developer's Guide (see CDSA)

   Other Help Topics

   Functions for the CSSM API:

       CSSM_GenerateMacInit
       CSSM_GenerateMacUpdate
       CSSM_GenerateMacFinal

   Functions for the CSP SPI:

       CSP_GenerateMacInit
       CSP_GenerateMacUpdate
       CSP_GenerateMacFinal