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annotate libtomcrypt/src/misc/hkdf/hkdf.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 <assert.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_HKDF
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17
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18 /* This is mostly just a wrapper around hmac_memory */
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19 int hkdf_extract(int hash_idx, const unsigned char *salt, unsigned long saltlen,
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20 const unsigned char *in, unsigned long inlen,
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21 unsigned char *out, unsigned long *outlen)
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22 {
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23 /* libtomcrypt chokes on a zero length HMAC key, so we need to check for
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24 that. HMAC specifies that keys shorter than the hash's blocksize are
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25 0 padded to the block size. HKDF specifies that a NULL salt is to be
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26 substituted with a salt comprised of hashLen 0 bytes. HMAC's padding
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27 means that in either case the HMAC is actually using a blocksize long
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28 zero filled key. Unless blocksize < hashLen (which wouldn't make any
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29 sense), we can use a single 0 byte as the HMAC key and still generate
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30 valid results for HKDF. */
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31 if (salt == NULL || saltlen == 0) {
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32 return hmac_memory(hash_idx, (const unsigned char *)"", 1, in, inlen, out, outlen);
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33 } else {
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34 return hmac_memory(hash_idx, salt, saltlen, in, inlen, out, outlen);
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35 }
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36 }
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37
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38 int hkdf_expand(int hash_idx, const unsigned char *info, unsigned long infolen,
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39 const unsigned char *in, unsigned long inlen,
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40 unsigned char *out, unsigned long outlen)
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41 {
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42 unsigned long hashsize;
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43 int err;
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44 unsigned char N;
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45 unsigned long Noutlen, outoff;
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46
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47 unsigned char *T, *dat;
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48 unsigned long Tlen, datlen;
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49
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50 /* make sure hash descriptor is valid */
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51 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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52 return err;
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53 }
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54
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55 hashsize = hash_descriptor[hash_idx].hashsize;
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56
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57 /* RFC5869 parameter restrictions */
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58 if (inlen < hashsize || outlen > hashsize * 255)
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59 return CRYPT_INVALID_ARG;
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60 if (info == NULL && infolen != 0)
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61 return CRYPT_INVALID_ARG;
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62 LTC_ARGCHK(out != NULL);
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63
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64 Tlen = hashsize + infolen + 1;
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65 T = XMALLOC(Tlen); /* Replace with static buffer? */
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66 if (T == NULL) {
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67 return CRYPT_MEM;
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68 }
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69 if (info != NULL) {
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70 XMEMCPY(T + hashsize, info, infolen);
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71 }
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72
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73 /* HMAC data T(1) doesn't include a previous hash value */
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74 dat = T + hashsize;
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75 datlen = Tlen - hashsize;
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76
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77 N = 0;
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78 outoff = 0; /* offset in out to write to */
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79 while (1) { /* an exit condition breaks mid-loop */
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80 Noutlen = MIN(hashsize, outlen - outoff);
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81 T[Tlen - 1] = ++N;
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82 if ((err = hmac_memory(hash_idx, in, inlen, dat, datlen,
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83 out + outoff, &Noutlen)) != CRYPT_OK) {
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84 zeromem(T, Tlen);
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85 XFREE(T);
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86 return err;
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87 }
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88 outoff += Noutlen;
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89
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90 if (outoff >= outlen) /* loop exit condition */
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91 break;
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92
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93 /* All subsequent HMAC data T(N) DOES include the previous hash value */
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94 XMEMCPY(T, out + hashsize * (N-1), hashsize);
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95 if (N == 1) {
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96 dat = T;
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97 datlen = Tlen;
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98 }
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99 }
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100 zeromem(T, Tlen);
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101 XFREE(T);
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102 return CRYPT_OK;
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103 }
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104
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105 /* all in one step */
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106 int hkdf(int hash_idx, const unsigned char *salt, unsigned long saltlen,
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107 const unsigned char *info, unsigned long infolen,
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108 const unsigned char *in, unsigned long inlen,
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109 unsigned char *out, unsigned long outlen)
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110 {
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111 unsigned long hashsize;
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112 int err;
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113 unsigned char *extracted;
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114
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115 /* make sure hash descriptor is valid */
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116 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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117 return err;
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118 }
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119
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120 hashsize = hash_descriptor[hash_idx].hashsize;
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121
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122 extracted = XMALLOC(hashsize); /* replace with static buffer? */
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123 if (extracted == NULL) {
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124 return CRYPT_MEM;
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125 }
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126 if ((err = hkdf_extract(hash_idx, salt, saltlen, in, inlen, extracted, &hashsize)) != 0) {
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127 zeromem(extracted, hashsize);
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128 XFREE(extracted);
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129 return err;
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130 }
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131 err = hkdf_expand(hash_idx, info, infolen, extracted, hashsize, out, outlen);
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132 zeromem(extracted, hashsize);
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133 XFREE(extracted);
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134 return err;
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135 }
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136 #endif /* LTC_HKDF */
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137
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138
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139 /* vim: set ts=2 sw=2 et ai si: */
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140
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141 /* ref: $Format:%D$ */
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142 /* git commit: $Format:%H$ */
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143 /* commit time: $Format:%ai$ */