Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 817:a625f9e135a4

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Constant time memcmp for the hmac and password crypt
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Oct 2013 22:25:30 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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382
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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
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12 /**
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13 @file gcm_mult_h.c
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14 GCM implementation, do the GF mult, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #if defined(GCM_MODE)
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19 /**
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20 GCM multiply by H
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21 @param gcm The GCM state which holds the H value
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22 @param I The value to multiply H by
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23 */
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24 void gcm_mult_h(gcm_state *gcm, unsigned char *I)
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25 {
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26 unsigned char T[16];
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27 #ifdef GCM_TABLES
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28 int x, y;
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29 #ifdef GCM_TABLES_SSE2
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30 asm("movdqa (%0),%%xmm0"::"r"(&gcm->PC[0][I[0]][0]));
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31 for (x = 1; x < 16; x++) {
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32 asm("pxor (%0),%%xmm0"::"r"(&gcm->PC[x][I[x]][0]));
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33 }
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34 asm("movdqa %%xmm0,(%0)"::"r"(&T));
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35 #else
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36 XMEMCPY(T, &gcm->PC[0][I[0]][0], 16);
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37 for (x = 1; x < 16; x++) {
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38 #ifdef LTC_FAST
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39 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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40 *((LTC_FAST_TYPE *)(T + y)) ^= *((LTC_FAST_TYPE *)(&gcm->PC[x][I[x]][y]));
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41 }
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42 #else
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43 for (y = 0; y < 16; y++) {
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44 T[y] ^= gcm->PC[x][I[x]][y];
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45 }
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46 #endif /* LTC_FAST */
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47 }
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48 #endif /* GCM_TABLES_SSE2 */
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49 #else
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50 gcm_gf_mult(gcm->H, I, T);
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51 #endif
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52 XMEMCPY(I, T, 16);
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53 }
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54 #endif
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55
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56 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_mult_h.c,v $ */
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57 /* $Revision: 1.4 $ */
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58 /* $Date: 2006/08/23 20:40:23 $ */