Mercurial > dropbear

annotate libtomcrypt/src/pk/dh/dh_check_pubkey.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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: $Format:%ai$ */