Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_setiv.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
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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 lrw_setiv.c
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13 LRW_MODE implementation, Set the current IV, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Set the IV for LRW
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20 @param IV The IV, must be 16 octets
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21 @param len Length ... must be 16 :-)
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22 @param lrw The LRW state to update
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23 @return CRYPT_OK if successful
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24 */
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25 int lrw_setiv(const unsigned char *IV, unsigned long len, symmetric_LRW *lrw)
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26 {
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27 int err;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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28 #ifdef LTC_LRW_TABLES
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29 unsigned char T[16];
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30 int x, y;
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31 #endif
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32 LTC_ARGCHK(IV != NULL);
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33 LTC_ARGCHK(lrw != NULL);
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34
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35 if (len != 16) {
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36 return CRYPT_INVALID_ARG;
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37 }
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38
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39 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
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40 return err;
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41 }
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42
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43 /* copy the IV */
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44 XMEMCPY(lrw->IV, IV, 16);
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45
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46 /* check if we have to actually do work */
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47 if (cipher_descriptor[lrw->cipher].accel_lrw_encrypt != NULL && cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
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48 /* we have accelerators, let's bail since they don't use lrw->pad anyways */
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49 return CRYPT_OK;
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50 }
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51
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 #ifdef LTC_LRW_TABLES
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53 XMEMCPY(T, &lrw->PC[0][IV[0]][0], 16);
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54 for (x = 1; x < 16; x++) {
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55 #ifdef LTC_FAST
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56 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&lrw->PC[x][IV[x]][y]));
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58 }
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59 #else
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60 for (y = 0; y < 16; y++) {
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61 T[y] ^= lrw->PC[x][IV[x]][y];
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62 }
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63 #endif
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64 }
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65 XMEMCPY(lrw->pad, T, 16);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 #else
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 gcm_gf_mult(lrw->tweak, IV, lrw->pad);
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68 #endif
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69
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70 return CRYPT_OK;
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71 }
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72
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73
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74 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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75 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* commit time: $Format:%ai$ */