GenerateMac

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