view ocb_shift_xor.c @ 162:bc4e3ac2dd5a libtomcrypt

make data pointers volatile so that memory zeroing won't get optimised away
author Matt Johnston <matt@ucc.asn.au>
date Sun, 02 Jan 2005 17:09:05 +0000
parents d7da3b1e1540
children
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, [email protected], http://libtomcrypt.org
 */

/* OCB Implementation by Tom St Denis */
#include "mycrypt.h"

#ifdef OCB_MODE

void ocb_shift_xor(ocb_state *ocb, unsigned char *Z)
{
   int x, y;
   y = ocb_ntz(ocb->block_index++);
   for (x = 0; x < ocb->block_len; x++) {
       ocb->Li[x] ^= ocb->Ls[y][x];
       Z[x]        = ocb->Li[x] ^ ocb->R[x];
   }
}

#endif