typedef enum cl_custom_function_id {
    CL_CUSTOMID_PACK_CERTIFICATE&tab;= 0,
    CL_CUSTOMID_UNPACK_CERTIFICATE&tab;= 1,
} CL_CUSTOM_FUNCTION_ID;

/*-------------------------------------------------------------------------
 * Name: CL_PassThrough
 *
 * Description:
 * This function allows applications to call OCSF CL module-specific operations.
 * The OCSF CL module-specific operations include:
 *    cl_PackCertificate
 *    cl_UnpackCertificate
 * 
 * Parameters: 
 * CCHandle (input)       : Handle identifying a Cryptographic Context which
 *                          may be used by the passthrough function
 * PassThroughId (input)  : An identifier assigned by the OCSF CL module
 *                          to indicate the exported function to perform.
 * InputParams (input)    : Parameters to be interpreted in a 
 *                          function-specific manner by the OCSF CL module.
 *
 * Return value:
 * Output from the passthrough function. 
 * The output data must be interpreted by the calling application 
 * based on externally available information.
 *
 * Error codes:
 * CSSM_CL_INVALID_CL_HANDLE
 * CSSM_CL_INVALID_CC_HANDLE
 * CSSM_CL_INVALID_DATA_POINTER
 * CSSM_CL_UNSUPPORTED_OPERATION
 * CSSM_CL_PASS_THROUGH_FAIL
 *-----------------------------------------------------------------------*/
CSSM_DATA_PTR CSSMAPI CL_PassThrough   (CSSM_CL_HANDLE CLHandle,
                                        CSSM_CC_HANDLE CCHandle, 
                                        uint32 PassThroughId, 
                                        const CSSM_DATA_PTR InputParams)
{
    /* Initializations */
    /* Check inputs */
        /* Check that this is a recognized PassThroughId */
    /* Call the requested function */
    switch ( PassThroughId ) {
 case CL_CUSTOMID_PACK_CERTIFICATE:&tab;
return cl_PackCertificate( InputParams );
 case CL_CUSTOMID_UNPACK_CERTIFICATE:
return cl_UnpackCertificate( InputParams );
 default:



       CSSM_SetError(&my_clm_guid, CSSM_CL_UNSUPPORTED_OPERATION);
       return NULL;