Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_done.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 Terminate a CCM stream
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15 @param ccm The CCM state
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16 @param tag [out] The destination for the MAC tag
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17 @param taglen [in/out] The length of the MAC tag
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18 @return CRYPT_OK on success
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19 */
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20 int ccm_done(ccm_state *ccm,
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21 unsigned char *tag, unsigned long *taglen)
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22 {
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23 unsigned long x, 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
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28 /* Check all data have been processed */
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29 if (ccm->ptlen != ccm->current_ptlen) {
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30 return CRYPT_ERROR;
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31 }
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32
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33 LTC_ARGCHK(tag != NULL);
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34 LTC_ARGCHK(taglen != NULL);
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35
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36 if (ccm->x != 0) {
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37 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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38 return err;
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39 }
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40 }
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41
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42 /* setup CTR for the TAG (zero the count) */
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43 for (y = 15; y > 15 - ccm->L; y--) {
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44 ccm->ctr[y] = 0x00;
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45 }
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46 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->ctr, ccm->CTRPAD, &ccm->K)) != CRYPT_OK) {
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47 return err;
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48 }
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49
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50 cipher_descriptor[ccm->cipher].done(&ccm->K);
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51
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52 /* store the TAG */
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53 for (x = 0; x < 16 && x < *taglen; x++) {
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54 tag[x] = ccm->PAD[x] ^ ccm->CTRPAD[x];
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55 }
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56 *taglen = x;
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57
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58 return CRYPT_OK;
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59 }
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60
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61 #endif
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62
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63 /* ref: $Format:%D$ */
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64 /* git commit: $Format:%H$ */
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65 /* commit time: $Format:%ai$ */