NAME
   VerifyMac,
   CSSM_VerifyMac,
   CSP_VerifyMac  - Verify the message authentication code (CDSA)

 SYNOPSIS
   # include <cssm.h>

    API:
        CSSM_RETURN CSSMAPI CSSM_VerifyMac
        (CSSM_CC_HANDLE CCHandle,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        const CSSM_DATA *Mac)
    SPI:
        CSSM_RETURN CSSMCSPI CSP_VerifyMac
        (CSSM_CSP_HANDLE CSPHandle,
        CSSM_CC_HANDLE CCHandle,
        const CSSM_CONTEXT *Context,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        const CSSM_DATA *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 (input)
           A pointer to the CSSM_DATA structure containing the MAC to
           verify.

 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 verifies the message authentication code over all data
   contained in the set of input buffers based on the input signature.

 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_INPUT_LENGTH_ERROR
        CSSMERR_CSP_VERIFY_FAILED
        CSSMERR_CSP_INVALID_SIGNATURE

 SEE ALSO
   Books

   Intel CDSA Application Developer's Guide (see CDSA)

   Other Help Topics

   Functions for the CSSM API:

       CSSM_VerifyMacInit
       CSSM_VerifyMacUpdate
       CSSM_VerifyMacFinal

   Functions for the CSP SPI:

       CSP_VerifyMacInit
       CSP_VerifyMacUpdate
       CSP_VerifyMacFinal