Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
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: $Format:%ai$ */