Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_add_nonce.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 #include "tomcrypt.h"
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10
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11 #ifdef LTC_CCM_MODE
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12
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13 /**
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14 Add nonce data to the CCM state
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15 @param ccm The CCM state
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16 @param nonce The nonce data to add
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17 @param noncelen The length of the nonce
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18 @return CRYPT_OK on success
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19 */
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20 int ccm_add_nonce(ccm_state *ccm,
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21 const unsigned char *nonce, unsigned long noncelen)
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22 {
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23 unsigned long x, y, len;
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24 int err;
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25
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26 LTC_ARGCHK(ccm != NULL);
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27 LTC_ARGCHK(nonce != NULL);
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28
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29 /* increase L to match the nonce len */
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30 ccm->noncelen = (noncelen > 13) ? 13 : noncelen;
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31 if ((15 - ccm->noncelen) > ccm->L) {
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32 ccm->L = 15 - ccm->noncelen;
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33 }
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34
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35 /* decrease noncelen to match L */
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36 if ((ccm->noncelen + ccm->L) > 15) {
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37 ccm->noncelen = 15 - ccm->L;
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38 }
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39
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40 /* form B_0 == flags | Nonce N | l(m) */
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41 x = 0;
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42 ccm->PAD[x++] = (unsigned char)(((ccm->aadlen > 0) ? (1<<6) : 0) |
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43 (((ccm->taglen - 2)>>1)<<3) |
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44 (ccm->L-1));
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45
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46 /* nonce */
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47 for (y = 0; y < (16 - (ccm->L + 1)); y++) {
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48 ccm->PAD[x++] = nonce[y];
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49 }
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50
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51 /* store len */
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52 len = ccm->ptlen;
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53
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54 /* shift len so the upper bytes of len are the contents of the length */
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55 for (y = ccm->L; y < 4; y++) {
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56 len <<= 8;
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57 }
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58
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59 /* store l(m) (only store 32-bits) */
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60 for (y = 0; ccm->L > 4 && (ccm->L-y)>4; y++) {
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61 ccm->PAD[x++] = 0;
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62 }
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63 for (; y < ccm->L; y++) {
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64 ccm->PAD[x++] = (unsigned char)((len >> 24) & 255);
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65 len <<= 8;
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66 }
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67
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68 /* encrypt PAD */
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69 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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70 return err;
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71 }
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72
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73 /* handle header */
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74 ccm->x = 0;
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75 if (ccm->aadlen > 0) {
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76 /* store length */
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77 if (ccm->aadlen < ((1UL<<16) - (1UL<<8))) {
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78 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>8) & 255;
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79 ccm->PAD[ccm->x++] ^= ccm->aadlen & 255;
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80 } else {
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81 ccm->PAD[ccm->x++] ^= 0xFF;
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82 ccm->PAD[ccm->x++] ^= 0xFE;
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83 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>24) & 255;
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84 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>16) & 255;
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85 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>8) & 255;
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86 ccm->PAD[ccm->x++] ^= ccm->aadlen & 255;
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87 }
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88 }
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89
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90 /* setup the ctr counter */
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91 x = 0;
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92
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93 /* flags */
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94 ccm->ctr[x++] = (unsigned char)ccm->L-1;
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95
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96 /* nonce */
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97 for (y = 0; y < (16 - (ccm->L+1)); ++y) {
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98 ccm->ctr[x++] = nonce[y];
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99 }
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100 /* offset */
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101 while (x < 16) {
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102 ccm->ctr[x++] = 0;
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103 }
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104
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105 ccm->CTRlen = 16;
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106 return CRYPT_OK;
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107 }
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108
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109 #endif
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110
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111 /* ref: $Format:%D$ */
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112 /* git commit: $Format:%H$ */
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113 /* commit time: $Format:%ai$ */