Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_done.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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382
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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 /**
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12 @file f9_done.c
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13 f9 Support, terminate the state
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14 */
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15
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16 #ifdef LTC_F9_MODE
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17
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18 /** Terminate the f9-MAC state
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19 @param f9 f9 state to terminate
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20 @param out [out] Destination for the MAC tag
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21 @param outlen [in/out] Destination size and final tag size
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22 Return CRYPT_OK on success
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23 */
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24 int f9_done(f9_state *f9, unsigned char *out, unsigned long *outlen)
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25 {
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26 int err, x;
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27 LTC_ARGCHK(f9 != NULL);
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28 LTC_ARGCHK(out != NULL);
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29
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30 /* check structure */
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31 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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36 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 if (f9->buflen != 0) {
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41 /* encrypt */
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42 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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43 f9->buflen = 0;
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44 for (x = 0; x < f9->blocksize; x++) {
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45 f9->ACC[x] ^= f9->IV[x];
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46 }
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47 }
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48
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49 /* schedule modified key */
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50 if ((err = cipher_descriptor[f9->cipher].setup(f9->akey, f9->keylen, 0, &f9->key)) != CRYPT_OK) {
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51 return err;
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52 }
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53
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54 /* encrypt the ACC */
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55 cipher_descriptor[f9->cipher].ecb_encrypt(f9->ACC, f9->ACC, &f9->key);
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56 cipher_descriptor[f9->cipher].done(&f9->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < f9->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = f9->ACC[x];
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61 }
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62 *outlen = x;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63
382
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(f9, sizeof(*f9));
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66 #endif
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67 return CRYPT_OK;
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68 }
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69
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70 #endif
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71
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* commit time: $Format:%ai$ */
382
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75