Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_shift_xor.c @ 1759:4c5599435084

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Sun, 25 Oct 2020 21:47:42 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file pmac_shift_xor.c
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13 PMAC implementation, internal function, by Tom St Denis
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14 */
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16 #ifdef LTC_PMAC
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18 /**
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19 Internal function. Performs the state update (adding correct multiple)
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20 @param pmac The PMAC state.
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21 */
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22 void pmac_shift_xor(pmac_state *pmac)
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23 {
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24 int x, y;
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25 y = pmac_ntz(pmac->block_index++);
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26 #ifdef LTC_FAST
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27 for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
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28 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Li + x)) ^=
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29 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pmac->Ls[y] + x));
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30 }
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31 #else
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32 for (x = 0; x < pmac->block_len; x++) {
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33 pmac->Li[x] ^= pmac->Ls[y][x];
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34 }
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35 #endif
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36 }
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38 #endif
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39
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40 /* ref: $Format:%D$ */
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41 /* git commit: $Format:%H$ */
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42 /* commit time: $Format:%ai$ */