annotate mupdf-source/thirdparty/curl/lib/hmac.c @ 46:7ee69f120f19 default tip

>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 * RFC2104 Keyed-Hashing for Message Authentication
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22 *
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23 ***************************************************************************/
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25 #include "curl_setup.h"
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27 #ifndef CURL_DISABLE_CRYPTO_AUTH
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29 #include <curl/curl.h>
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31 #include "curl_hmac.h"
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32 #include "curl_memory.h"
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34 /* The last #include file should be: */
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35 #include "memdebug.h"
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37 /*
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38 * Generic HMAC algorithm.
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39 *
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40 * This module computes HMAC digests based on any hash function. Parameters
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41 * and computing procedures are set-up dynamically at HMAC computation
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42 * context initialisation.
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43 */
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44
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45 static const unsigned char hmac_ipad = 0x36;
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46 static const unsigned char hmac_opad = 0x5C;
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47
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49
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50 HMAC_context *
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51 Curl_HMAC_init(const HMAC_params * hashparams,
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52 const unsigned char *key,
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53 unsigned int keylen)
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54 {
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55 size_t i;
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56 HMAC_context *ctxt;
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57 unsigned char *hkey;
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58 unsigned char b;
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59
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60 /* Create HMAC context. */
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61 i = sizeof(*ctxt) + 2 * hashparams->hmac_ctxtsize +
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62 hashparams->hmac_resultlen;
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63 ctxt = malloc(i);
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64
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65 if(!ctxt)
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66 return ctxt;
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67
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68 ctxt->hmac_hash = hashparams;
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69 ctxt->hmac_hashctxt1 = (void *) (ctxt + 1);
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70 ctxt->hmac_hashctxt2 = (void *) ((char *) ctxt->hmac_hashctxt1 +
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71 hashparams->hmac_ctxtsize);
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72
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73 /* If the key is too long, replace it by its hash digest. */
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74 if(keylen > hashparams->hmac_maxkeylen) {
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75 (*hashparams->hmac_hinit)(ctxt->hmac_hashctxt1);
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76 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, key, keylen);
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77 hkey = (unsigned char *) ctxt->hmac_hashctxt2 + hashparams->hmac_ctxtsize;
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78 (*hashparams->hmac_hfinal)(hkey, ctxt->hmac_hashctxt1);
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79 key = hkey;
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80 keylen = hashparams->hmac_resultlen;
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81 }
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82
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83 /* Prime the two hash contexts with the modified key. */
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84 (*hashparams->hmac_hinit)(ctxt->hmac_hashctxt1);
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85 (*hashparams->hmac_hinit)(ctxt->hmac_hashctxt2);
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86
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87 for(i = 0; i < keylen; i++) {
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88 b = (unsigned char)(*key ^ hmac_ipad);
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89 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, &b, 1);
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90 b = (unsigned char)(*key++ ^ hmac_opad);
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91 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2, &b, 1);
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92 }
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93
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94 for(; i < hashparams->hmac_maxkeylen; i++) {
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95 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, &hmac_ipad, 1);
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96 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2, &hmac_opad, 1);
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97 }
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98
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99 /* Done, return pointer to HMAC context. */
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100 return ctxt;
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101 }
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102
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103 int Curl_HMAC_update(HMAC_context * ctxt,
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104 const unsigned char *data,
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105 unsigned int len)
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106 {
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107 /* Update first hash calculation. */
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108 (*ctxt->hmac_hash->hmac_hupdate)(ctxt->hmac_hashctxt1, data, len);
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109 return 0;
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110 }
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111
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112
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113 int Curl_HMAC_final(HMAC_context *ctxt, unsigned char *result)
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114 {
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115 const HMAC_params * hashparams = ctxt->hmac_hash;
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116
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117 /* Do not get result if called with a null parameter: only release
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118 storage. */
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119
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120 if(!result)
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121 result = (unsigned char *) ctxt->hmac_hashctxt2 +
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122 ctxt->hmac_hash->hmac_ctxtsize;
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123
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124 (*hashparams->hmac_hfinal)(result, ctxt->hmac_hashctxt1);
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125 (*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2,
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126 result, hashparams->hmac_resultlen);
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127 (*hashparams->hmac_hfinal)(result, ctxt->hmac_hashctxt2);
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128 free((char *) ctxt);
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129 return 0;
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130 }
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131
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132 #endif /* CURL_DISABLE_CRYPTO_AUTH */