OSX/utilities/SecBuffer.c

   1 //
   2 //  SecBuffer.c
   3 //  utilities
   4 //
   5 //  Created by Mitch Adler on 3/6/15.
   6 //  Copyright © 2015 Apple Inc. All rights reserved.
   7 //
   8
   9 #include <utilities/SecBuffer.h>
  10
  11 #include <strings.h>
  12
  13 #define stackBufferSizeLimit 2048
  14
  15 void PerformWithBuffer(size_t size, void (^operation)(size_t size, uint8_t *buffer)) {
  16     if (size == 0) {
  17         operation(0, NULL);
  18     } else if (size <= stackBufferSizeLimit) {
  19         uint8_t buffer[size];
  20         operation(size, buffer);
  21     } else {
  22         uint8_t *buffer = malloc(size);
  23
  24         operation(size, buffer);
  25
  26         if (buffer)
  27             free(buffer);
  28     }
  29 }
  30
  31 void PerformWithBufferAndClear(size_t size, void (^operation)(size_t size, uint8_t *buffer)) {
  32     PerformWithBuffer(size, ^(size_t size, uint8_t *buffer) {
  33         operation(size, buffer);
  34
  35         bzero(buffer, size);
  36     });
  37 }