Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 $ */