Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_done.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
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 xcbc_done.c
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13 XCBC Support, terminate the state
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14 */
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15
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16 #ifdef LTC_XCBC
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17
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18 /** Terminate the XCBC-MAC state
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19 @param xcbc XCBC 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 xcbc_done(xcbc_state *xcbc, 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(xcbc != 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(xcbc->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 ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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36 (xcbc->buflen > xcbc->blocksize) || (xcbc->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 /* which key do we use? */
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41 if (xcbc->buflen == xcbc->blocksize) {
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42 /* k2 */
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43 for (x = 0; x < xcbc->blocksize; x++) {
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44 xcbc->IV[x] ^= xcbc->K[1][x];
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45 }
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46 } else {
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47 xcbc->IV[xcbc->buflen] ^= 0x80;
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48 /* k3 */
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49 for (x = 0; x < xcbc->blocksize; x++) {
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50 xcbc->IV[x] ^= xcbc->K[2][x];
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51 }
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52 }
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53
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54 /* encrypt */
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55 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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56 cipher_descriptor[xcbc->cipher].done(&xcbc->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < xcbc->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = xcbc->IV[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(xcbc, sizeof(*xcbc));
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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