Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_shift_xor.c @ 417:fb02e3180d90

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2007 10:55:20 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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12 /**
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13 @file ocb_shift_xor.c
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14 OCB implementation, internal function, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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18 #ifdef OCB_MODE
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20 /**
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21 Compute the shift/xor for OCB (internal function)
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22 @param ocb The OCB state
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23 @param Z The destination of the shift
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24 */
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25 void ocb_shift_xor(ocb_state *ocb, unsigned char *Z)
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26 {
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27 int x, y;
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28 y = ocb_ntz(ocb->block_index++);
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29 for (x = 0; x < ocb->block_len; x++) {
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30 ocb->Li[x] ^= ocb->Ls[y][x];
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31 Z[x] = ocb->Li[x] ^ ocb->R[x];
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32 }
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33 }
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35 #endif
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37 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c,v $ */
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38 /* $Revision: 1.4 $ */
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39 /* $Date: 2006/03/31 14:15:35 $ */