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HMAC.php
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1 <?php
2 
17 require_once 'Auth/OpenID.php';
18 
23 define('Auth_OpenID_SHA1_BLOCKSIZE', 64);
24 
25 function Auth_OpenID_SHA1($text)
26 {
27  if (function_exists('hash') &&
28  function_exists('hash_algos') &&
29  (in_array('sha1', hash_algos()))) {
30  // PHP 5 case (sometimes): 'hash' available and 'sha1' algo
31  // supported.
32  return hash('sha1', $text, true);
33  } else if (function_exists('sha1')) {
34  // PHP 4 case: 'sha1' available.
35  $hex = sha1($text);
36  $raw = '';
37  for ($i = 0; $i < 40; $i += 2) {
38  $hexcode = substr($hex, $i, 2);
39  $charcode = (int)base_convert($hexcode, 16, 10);
40  $raw .= chr($charcode);
41  }
42  return $raw;
43  } else {
44  // Explode.
45  trigger_error('No SHA1 function found', E_USER_ERROR);
46  }
47 }
48 
57 function Auth_OpenID_HMACSHA1($key, $text)
58 {
59  if (Auth_OpenID::bytes($key) > Auth_OpenID_SHA1_BLOCKSIZE) {
60  $key = Auth_OpenID_SHA1($key, true);
61  }
62 
63  if (function_exists('hash_hmac') &&
64  function_exists('hash_algos') &&
65  (in_array('sha1', hash_algos()))) {
66  return hash_hmac('sha1', $text, $key, true);
67  }
68  // Home-made solution
69 
70  $key = str_pad($key, Auth_OpenID_SHA1_BLOCKSIZE, chr(0x00));
71  $ipad = str_repeat(chr(0x36), Auth_OpenID_SHA1_BLOCKSIZE);
72  $opad = str_repeat(chr(0x5c), Auth_OpenID_SHA1_BLOCKSIZE);
73  $hash1 = Auth_OpenID_SHA1(($key ^ $ipad) . $text, true);
74  $hmac = Auth_OpenID_SHA1(($key ^ $opad) . $hash1, true);
75  return $hmac;
76 }
77 
78 if (function_exists('hash') &&
79  function_exists('hash_algos') &&
80  (in_array('sha256', hash_algos()))) {
81  function Auth_OpenID_SHA256($text)
82  {
83  // PHP 5 case: 'hash' available and 'sha256' algo supported.
84  return hash('sha256', $text, true);
85  }
86  define('Auth_OpenID_SHA256_SUPPORTED', true);
87 } else {
88  define('Auth_OpenID_SHA256_SUPPORTED', false);
89 }
90 
91 if (function_exists('hash_hmac') &&
92  function_exists('hash_algos') &&
93  (in_array('sha256', hash_algos()))) {
94 
95  function Auth_OpenID_HMACSHA256($key, $text)
96  {
97  // Return raw MAC (not hex string).
98  return hash_hmac('sha256', $text, $key, true);
99  }
100 
101  define('Auth_OpenID_HMACSHA256_SUPPORTED', true);
102 } else {
103  define('Auth_OpenID_HMACSHA256_SUPPORTED', false);
104 }
105 
Auth_OpenID_SHA1
Auth_OpenID_SHA1($text)
Definition: HMAC.php:25
E_USER_ERROR
if(!defined('ADODB_ERROR_HANDLER_TYPE')) define('ADODB_ERROR_HANDLER_TYPE' E_USER_ERROR
Definition: adodb-errorhandler.inc.php:16
Auth_OpenID_SHA1_BLOCKSIZE
const Auth_OpenID_SHA1_BLOCKSIZE
Definition: HMAC.php:23
Auth_OpenID\bytes
static bytes($str)
Definition: OpenID.php:462
Auth_OpenID_HMACSHA1
Auth_OpenID_HMACSHA1($key, $text)
Definition: HMAC.php:57