lib/memxor.c

   1 /* Binary exclusive OR operation of two memory blocks.  -*- coding: utf-8 -*-
   2    Copyright (C) 2005-2006, 2009-2018 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Simon Josefsson.  The interface was inspired by memxor
  18    in Niels Möller's Nettle. */
  19
  20 #include <config.h>
  21
  22 #include "memxor.h"
  23
  24 void *
  25 memxor (void *restrict dest, const void *restrict src, size_t n)
  26 {
  27   char const *s = src;
  28   char *d = dest;
  29
  30   for (; n > 0; n--)
  31     *d++ ^= *s++;
  32
  33   return dest;
  34 }