utilities/src/comparison.c

   1 //
   2 //  comparison.c
   3 //  utilities
   4 //
   5 //  Created by Keith Henrickson on 7/1/12.
   6 //  Copyright (c) 2012 Apple Inc. All rights reserved.
   7 //
   8
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include "comparison.h"
  12
  13 uint64_t constant_memcmp(const uint8_t *first, const uint8_t *second, size_t count) {
  14     uint64_t error_counter = 0;
  15     for (size_t counter = 0; counter < count; counter++) {
  16         error_counter |= first[counter] ^ second[counter];
  17     }
  18     return error_counter;
  19 }