Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_add_aad.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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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 #ifdef LTC_CCM_MODE
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12
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13 /**
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14 Add AAD to the CCM state
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15 @param ccm The CCM state
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16 @param adata The additional authentication data to add to the CCM state
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17 @param adatalen The length of the AAD data.
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18 @return CRYPT_OK on success
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19 */
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20 int ccm_add_aad(ccm_state *ccm,
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21 const unsigned char *adata, unsigned long adatalen)
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22 {
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23 unsigned long y;
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24 int err;
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25
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26 LTC_ARGCHK(ccm != NULL);
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27 LTC_ARGCHK(adata != NULL);
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28
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29 if (ccm->aadlen < ccm->current_aadlen + adatalen) {
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30 return CRYPT_INVALID_ARG;
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31 }
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32 ccm->current_aadlen += adatalen;
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33
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34 /* now add the data */
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35 for (y = 0; y < adatalen; y++) {
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36 if (ccm->x == 16) {
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37 /* full block so let's encrypt it */
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38 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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39 return err;
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40 }
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41 ccm->x = 0;
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42 }
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43 ccm->PAD[ccm->x++] ^= adata[y];
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44 }
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45
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46 /* remainder? */
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47 if (ccm->aadlen == ccm->current_aadlen) {
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48 if (ccm->x != 0) {
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49 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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50 return err;
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51 }
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52 }
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53 ccm->x = 0;
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54 }
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55
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56 return CRYPT_OK;
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57 }
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58
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59 #endif
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60
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61 /* ref: $Format:%D$ */
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62 /* git commit: $Format:%H$ */
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63 /* commit time: $Format:%ai$ */