Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_done.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
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: $Format:%ai$ */