core/lib/libtomcrypt/src/mac/pmac/pmac_shift_xor.c

// SPDX-License-Identifier: BSD-2-Clause
/* 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.
 */
#include "tomcrypt_private.h"

/**
   @file pmac_shift_xor.c
   PMAC implementation, internal function, by Tom St Denis
*/

#ifdef LTC_PMAC

/**
  Internal function.  Performs the state update (adding correct multiple)
  @param pmac   The PMAC state.
*/
void pmac_shift_xor(pmac_state *pmac)
{
   int x, y;
   y = pmac_ntz(pmac->block_index++);
#ifdef LTC_FAST
   for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
       *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Li + x)) ^=
       *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Ls[y] + x));
   }
#else
   for (x = 0; x < pmac->block_len; x++) {
       pmac->Li[x] ^= pmac->Ls[y][x];
   }
#endif
}

#endif

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