Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_add_aad.c @ 1587:b579ec254988

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try and improve the odds of useful fuzzer activity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 04 Mar 2018 22:11:23 +0800
parents 6dba84798cd5
children
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */