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annotate libtomcrypt/src/encauth/ccm/ccm_done.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */