Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_shift_xor.c @ 719:1b8b2b9d6e94 DROPBEAR_2013.56

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author Matt Johnston <matt@ucc.asn.au>
date Thu, 21 Mar 2013 23:29:04 +0800
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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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file pmac_shift_xor.c
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15 PMAC implementation, internal function, by Tom St Denis
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16 */
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17
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18 #ifdef LTC_PMAC
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20 /**
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21 Internal function. Performs the state update (adding correct multiple)
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22 @param pmac The PMAC state.
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23 */
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24 void pmac_shift_xor(pmac_state *pmac)
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25 {
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26 int x, y;
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27 y = pmac_ntz(pmac->block_index++);
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28 #ifdef LTC_FAST
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29 for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
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30 *((LTC_FAST_TYPE*)((unsigned char *)pmac->Li + x)) ^=
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31 *((LTC_FAST_TYPE*)((unsigned char *)pmac->Ls[y] + x));
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32 }
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33 #else
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34 for (x = 0; x < pmac->block_len; x++) {
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35 pmac->Li[x] ^= pmac->Ls[y][x];
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36 }
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37 #endif
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38 }
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40 #endif
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42 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_shift_xor.c,v $ */
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43 /* $Revision: 1.6 $ */
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44 /* $Date: 2006/11/03 00:39:49 $ */