Mercurial > dropbear

annotate libtomcrypt/src/pk/dh/dh_check_pubkey.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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Check DH public key (INTERNAL ONLY, not part of public API)
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16 @param key The key you wish to test
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17 @return CRYPT_OK if successful
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18 */
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19 int dh_check_pubkey(dh_key *key)
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20 {
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21 void *p_minus1;
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22 ltc_mp_digit digit;
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23 int i, digit_count, bits_set = 0, err;
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24
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25 LTC_ARGCHK(key != NULL);
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26
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27 if ((err = mp_init(&p_minus1)) != CRYPT_OK) {
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28 return err;
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29 }
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30
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31 /* avoid: y <= 1 OR y >= p-1 */
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32 if ((err = mp_sub_d(key->prime, 1, p_minus1)) != CRYPT_OK) {
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33 goto error;
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34 }
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35 if (mp_cmp(key->y, p_minus1) != LTC_MP_LT || mp_cmp_d(key->y, 1) != LTC_MP_GT) {
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36 err = CRYPT_INVALID_ARG;
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37 goto error;
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38 }
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39
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40 /* public key must have more than one bit set */
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41 digit_count = mp_get_digit_count(key->y);
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42 for (i = 0; i < digit_count && bits_set < 2; i++) {
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43 digit = mp_get_digit(key->y, i);
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44 while (digit > 0) {
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45 if (digit & 1) bits_set++;
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46 digit >>= 1;
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47 }
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48 }
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49 if (bits_set > 1) {
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50 err = CRYPT_OK;
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51 }
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52 else {
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53 err = CRYPT_INVALID_ARG;
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54 }
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55
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56 error:
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57 mp_clear(p_minus1);
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58 return err;
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59 }
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60
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61 #endif /* LTC_MDH */
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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: $Format:%ai$ */