NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

       # include <cdsa/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    [Toc]    [Back]

       Common Security Services Manager library (libcssm.so)

API PARAMETERS    [Toc]    [Back]

       The  handle  that  describes  the  context of this cryptographic
 operation used to link to the CSP-managed information.
   A pointer to a vector of CSSM_DATA structures that
       contain the  data  to  be  operated  on.   The  number  of
       DataBufs.   A  pointer  to the CSSM_DATA structure for the
       message digest.

SPI PARAMETERS    [Toc]    [Back]

       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.  Pointer to CSSM_CONTEXT
       structure that describes the attributes with this context.

DESCRIPTION    [Toc]    [Back]

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

NOTES FOR API    [Toc]    [Back]

       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    [Toc]    [Back]

       The  output  is  returned  to  the  caller  as specifed in
       Buffer Management for Cryptographic Services.

RETURN VALUE    [Toc]    [Back]

       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    [Toc]    [Back]

       Errors are described in the CDSA technical standard.   See
       CDSA_intro(3).  CSSMERR_CSP_OUTPUT_LENGTH_ERROR

SEE ALSO    [Toc]    [Back]

       Books

       Intel    CDSA    Application    Developer's   Guide   (see
       CDSA_intro(3))

       Reference Pages    [Toc]    [Back]

       Functions for the CSSM API:

       CSSM_DigestDataInit(3),          CSSM_DigestDataUpdate(3),
       CSSM_DigestDataFinal(3), CSSM_DigestDataClone(3)

       Functions for the CSP SPI:

       CSP_DigestDataInit(3),            CSP_DigestDataUpdate(3),
       CSP_DigestDataFinal(3), CSP_DigestDataClone(3)



                                                    DigestData(3)