File zp-extensions/federated_logon/Auth/OpenID/HMAC.php

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  1: <?php
  2: 
  3: /**
  4:  * This is the HMACSHA1 implementation for the OpenID library.
  5:  *
  6:  * PHP versions 4 and 5
  7:  *
  8:  * LICENSE: See the COPYING file included in this distribution.
  9:  *
 10:  * @access private
 11:  * @package OpenID
 12:  * @author JanRain, Inc. <openid@janrain.com>
 13:  * @copyright 2005-2008 Janrain, Inc.
 14:  * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
 15:  */
 16: 
 17: require_once 'Auth/OpenID.php';
 18: 
 19: /**
 20:  * SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback
 21:  * implementation.
 22:  */
 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: 
 49: /**
 50:  * Compute an HMAC/SHA1 hash.
 51:  *
 52:  * @access private
 53:  * @param string $key The HMAC key
 54:  * @param string $text The message text to hash
 55:  * @return string $mac The MAC
 56:  */
 57: function Auth_OpenID_HMACSHA1($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: 
106: