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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
*/
/**
@file ocb_shift_xor.c
OCB implementation, internal function, by Tom St Denis
*/
#include "tomcrypt.h"
#ifdef OCB_MODE
/**
Compute the shift/xor for OCB (internal function)
@param ocb The OCB state
@param Z The destination of the shift
*/
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
/* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/03/31 14:15:35 $ */
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