osfmk/corecrypto/cc/src/cc_clear.c

   1 /*
   2  *  cc_clear.c
   3  *  corecrypto
   4  *
   5  *  Created on 05/21/2014
   6  *
   7  *  Copyright (c) 2014,2015 Apple Inc. All rights reserved.
   8  *
   9  */
  10
  11 #include <corecrypto/cc.h>
  12
  13 void cc_clear(size_t len, void *dst)
  14 {
  15 #if ( CC_HAS_MEMSET_S == 1 ) && (defined( __STDC_WANT_LIB_EXT1__ ) && ( __STDC_WANT_LIB_EXT1__ == 1 ) )
  16     memset_s(dst,len,0,len);
  17 #else
  18     volatile size_t ctr=0;
  19     volatile uint8_t *data=dst;
  20     if (len) {
  21         cc_zero(len,dst);
  22         (void)data[ctr]; // Touch the buffer so that the compiler does not
  23             // Optimize out the zeroing
  24     }
  25 #endif
  26 }
  27