DigestData

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