Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 1673:e0871128e61f

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CBC mode cleanup (#95) * Fix CBC mode can't be fully disabled * Fix CBC mode can't be the only mode
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:55:13 +0500
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
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10 /**
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11 @file gcm_mult_h.c
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12 GCM implementation, do the GF mult, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #if defined(LTC_GCM_MODE)
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17 /**
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18 GCM multiply by H
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19 @param gcm The GCM state which holds the H value
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20 @param I The value to multiply H by
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21 */
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22 void gcm_mult_h(gcm_state *gcm, unsigned char *I)
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23 {
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24 unsigned char T[16];
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25 #ifdef LTC_GCM_TABLES
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26 int x;
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27 #ifdef LTC_GCM_TABLES_SSE2
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28 asm("movdqa (%0),%%xmm0"::"r"(&gcm->PC[0][I[0]][0]));
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29 for (x = 1; x < 16; x++) {
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30 asm("pxor (%0),%%xmm0"::"r"(&gcm->PC[x][I[x]][0]));
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31 }
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32 asm("movdqa %%xmm0,(%0)"::"r"(&T));
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33 #else
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34 int y;
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35 XMEMCPY(T, &gcm->PC[0][I[0]][0], 16);
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36 for (x = 1; x < 16; x++) {
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37 #ifdef LTC_FAST
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38 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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39 *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&gcm->PC[x][I[x]][y]));
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40 }
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41 #else
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42 for (y = 0; y < 16; y++) {
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43 T[y] ^= gcm->PC[x][I[x]][y];
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44 }
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45 #endif /* LTC_FAST */
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46 }
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47 #endif /* LTC_GCM_TABLES_SSE2 */
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48 #else
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49 gcm_gf_mult(gcm->H, I, T);
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50 #endif
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51 XMEMCPY(I, T, 16);
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52 }
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53 #endif
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54
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55 /* ref: $Format:%D$ */
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56 /* git commit: $Format:%H$ */
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57 /* commit time: $Format:%ai$ */