XXX Enlarge data buffer in digest/mac to boost performance

*** 49,59 ****
  #include <security/cryptoki.h>
  #include <limits.h>
  #include <cryptoutil.h>
  #include <kmfapi.h>
  
! #define BUFFERSIZE      (4096)          /* Buffer size for reading file */
  
  /*
   * RESULTLEN - large enough size in bytes to hold result for
   * digest and mac results for all mechanisms
   */
--- 49,63 ----
  #include <security/cryptoki.h>
  #include <limits.h>
  #include <cryptoutil.h>
  #include <kmfapi.h>
  
! /*
!  * Buffer size for reading file. This is given a rather high value
!  * to get better performance when a hardware provider is present.
!  */
! #define BUFFERSIZE      (1024 * 64)
  
  /*
   * RESULTLEN - large enough size in bytes to hold result for
   * digest and mac results for all mechanisms
   */