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annotate libtomcrypt/src/misc/hkdf/hkdf.c @ 1928:333688ec53d0

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Handle ecdsa-sk flags, reject no-touch For the time being Dropbear will only allow SK auth with default parameters, user-presence needs to be set. In future handling of authorized_keys option "no-touch-required" can be added. This code would also be refactored to share between ecdsa and ed25519 once I get hardware/emulation to test ed25519.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 21:06:15 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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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: $Format:%ai$ */