Mercurial > dropbear
annotate libtomcrypt/src/encauth/ccm/ccm_add_aad.c @ 1744:6cf465af5d9f fuzz
Allocate real file descriptors for fuzz input with dup()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 18 Oct 2020 22:52:24 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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: $Format:%ai$ */ |