Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_process.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
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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 Process plaintext/ciphertext through CCM
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15 @param ccm The CCM state
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16 @param pt The plaintext
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17 @param ptlen The plaintext length (ciphertext length is the same)
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18 @param ct The ciphertext
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19 @param direction Encrypt or Decrypt mode (CCM_ENCRYPT or CCM_DECRYPT)
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20 @return CRYPT_OK on success
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21 */
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22 int ccm_process(ccm_state *ccm,
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23 unsigned char *pt, unsigned long ptlen,
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24 unsigned char *ct,
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25 int direction)
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26 {
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27 unsigned char z, b;
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28 unsigned long y;
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29 int err;
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30
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31 LTC_ARGCHK(ccm != NULL);
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32
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33 /* Check aad has been correctly added */
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34 if (ccm->aadlen != ccm->current_aadlen) {
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35 return CRYPT_ERROR;
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36 }
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37
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38 /* Check we do not process too much data */
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39 if (ccm->ptlen < ccm->current_ptlen + ptlen) {
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40 return CRYPT_ERROR;
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41 }
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42 ccm->current_ptlen += ptlen;
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43
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44 /* now handle the PT */
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45 if (ptlen > 0) {
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46 LTC_ARGCHK(pt != NULL);
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47 LTC_ARGCHK(ct != NULL);
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48
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49 for (y = 0; y < ptlen; y++) {
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50 /* increment the ctr? */
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51 if (ccm->CTRlen == 16) {
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52 for (z = 15; z > 15-ccm->L; z--) {
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53 ccm->ctr[z] = (ccm->ctr[z] + 1) & 255;
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54 if (ccm->ctr[z]) break;
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55 }
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56 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->ctr, ccm->CTRPAD, &ccm->K)) != CRYPT_OK) {
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57 return err;
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58 }
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59 ccm->CTRlen = 0;
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60 }
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61
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62 /* if we encrypt we add the bytes to the MAC first */
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63 if (direction == CCM_ENCRYPT) {
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64 b = pt[y];
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65 ct[y] = b ^ ccm->CTRPAD[ccm->CTRlen++];
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66 } else {
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67 b = ct[y] ^ ccm->CTRPAD[ccm->CTRlen++];
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68 pt[y] = b;
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69 }
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70
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71 if (ccm->x == 16) {
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72 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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73 return err;
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74 }
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75 ccm->x = 0;
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76 }
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77 ccm->PAD[ccm->x++] ^= b;
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78 }
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79 }
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80
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81 return CRYPT_OK;
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82 }
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83
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84 #endif
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85
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86 /* ref: $Format:%D$ */
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87 /* git commit: $Format:%H$ */
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88 /* commit time: $Format:%ai$ */