ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
HMAC.php
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1<?php
2
17require_once 'Auth/OpenID.php';
18
23define('Auth_OpenID_SHA1_BLOCKSIZE', 64);
24
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
58{
60 $key = Auth_OpenID_SHA1($key, true);
61 }
62
63 $key = str_pad($key, Auth_OpenID_SHA1_BLOCKSIZE, chr(0x00));
64 $ipad = str_repeat(chr(0x36), Auth_OpenID_SHA1_BLOCKSIZE);
65 $opad = str_repeat(chr(0x5c), Auth_OpenID_SHA1_BLOCKSIZE);
66 $hash1 = Auth_OpenID_SHA1(($key ^ $ipad) . $text, true);
67 $hmac = Auth_OpenID_SHA1(($key ^ $opad) . $hash1, true);
68 return $hmac;
69}
70
71if (function_exists('hash') &&
72 function_exists('hash_algos') &&
73 (in_array('sha256', hash_algos()))) {
74 function Auth_OpenID_SHA256($text)
75 {
76 // PHP 5 case: 'hash' available and 'sha256' algo supported.
77 return hash('sha256', $text, true);
78 }
79 define('Auth_OpenID_SHA256_SUPPORTED', true);
80} else {
81 define('Auth_OpenID_SHA256_SUPPORTED', false);
82}
83
84if (function_exists('hash_hmac') &&
85 function_exists('hash_algos') &&
86 (in_array('sha256', hash_algos()))) {
87
88 function Auth_OpenID_HMACSHA256($key, $text)
89 {
90 // Return raw MAC (not hex string).
91 return hash_hmac('sha256', $text, $key, true);
92 }
93
94 define('Auth_OpenID_HMACSHA256_SUPPORTED', true);
95} else {
96 define('Auth_OpenID_HMACSHA256_SUPPORTED', false);
97}
98
const Auth_OpenID_SHA1_BLOCKSIZE
SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback implementation.
Definition: HMAC.php:23
Auth_OpenID_SHA1($text)
Definition: HMAC.php:25
Auth_OpenID_HMACSHA1($key, $text)
Compute an HMAC/SHA1 hash.
Definition: HMAC.php:57
static bytes($str)
Count the number of bytes in a string independently of multibyte support conditions.
Definition: OpenID.php:462
$text