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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, tomstdenis@gmail.com, http://libtomcrypt.com
*/
#include "tomcrypt.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*)((unsigned char *)pmac->Li + x)) ^=
*((LTC_FAST_TYPE*)((unsigned char *)pmac->Ls[y] + x));
}
#else
for (x = 0; x < pmac->block_len; x++) {
pmac->Li[x] ^= pmac->Ls[y][x];
}
#endif
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_shift_xor.c,v $ */
/* $Revision: 1.6 $ */
/* $Date: 2006/11/03 00:39:49 $ */
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