Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_add_aad.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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: $Format:%ai$ */