NAME
   DigestData,
   CSSM_DigestData,
   CSP_DigestData  - Compute message digest (CDSA)

 SYNOPSIS
   # include <cssm.h>

    API:
        CSSM_RETURN CSSMAPI CSSM_DigestData
        (CSSM_CC_HANDLE CCHandle,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_DATA_PTR Digest)
    SPI:
        CSSM_RETURN CSSMCSPI CSP_DigestData
        (CSSM_CSP_HANDLE CSPHandle,
        CSSM_CC_HANDLE CCHandle,
        const CSSM_CONTEXT *Context,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_DATA_PTR Digest)

 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.

   Digest (output)
           A pointer to the CSSM_DATA structure for the message digest.

 SPI PARAMETERS
   CSPHandle (input)
           The handle that describes the add-in cryptographic service
           provider module used to perform up 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 digest for all data contained in the
   set of input buffers.

 NOTES FOR 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 FOR SPI
   The output is returned to the caller as specifed 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_DigestDataInit
       CSSM_DigestDataUpdate
       CSSM_DigestDataFinal
       CSSM_DigestDataClone

   Functions for the CSP SPI:

       CSP_DigestDataInit
       CSP_DigestDataUpdate
       CSP_DigestDataFinal
       CSP_DigestDataClone