100 lines
2.7 KiB
PHP
100 lines
2.7 KiB
PHP
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<?php
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/**
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* This is the HMACSHA1 implementation for the OpenID library.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: See the COPYING file included in this distribution.
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*
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* @access private
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* @package OpenID
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* @author JanRain, Inc. <openid@janrain.com>
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* @copyright 2005-2008 Janrain, Inc.
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
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*/
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require_once 'Auth/OpenID.php';
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/**
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* SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback
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* implementation.
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*/
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define('Auth_OpenID_SHA1_BLOCKSIZE', 64);
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function Auth_OpenID_SHA1($text)
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{
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if (function_exists('hash') &&
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function_exists('hash_algos') &&
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(in_array('sha1', hash_algos()))) {
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// PHP 5 case (sometimes): 'hash' available and 'sha1' algo
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// supported.
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return hash('sha1', $text, true);
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} else if (function_exists('sha1')) {
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// PHP 4 case: 'sha1' available.
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$hex = sha1($text);
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$raw = '';
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for ($i = 0; $i < 40; $i += 2) {
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$hexcode = substr($hex, $i, 2);
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$charcode = (int)base_convert($hexcode, 16, 10);
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$raw .= chr($charcode);
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}
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return $raw;
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} else {
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// Explode.
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trigger_error('No SHA1 function found', E_USER_ERROR);
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}
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}
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/**
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* Compute an HMAC/SHA1 hash.
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*
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* @access private
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* @param string $key The HMAC key
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* @param string $text The message text to hash
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* @return string $mac The MAC
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*/
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function Auth_OpenID_HMACSHA1($key, $text)
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{
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if (Auth_OpenID::bytes($key) > Auth_OpenID_SHA1_BLOCKSIZE) {
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$key = Auth_OpenID_SHA1($key, true);
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}
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$key = str_pad($key, Auth_OpenID_SHA1_BLOCKSIZE, chr(0x00));
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$ipad = str_repeat(chr(0x36), Auth_OpenID_SHA1_BLOCKSIZE);
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$opad = str_repeat(chr(0x5c), Auth_OpenID_SHA1_BLOCKSIZE);
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$hash1 = Auth_OpenID_SHA1(($key ^ $ipad) . $text, true);
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$hmac = Auth_OpenID_SHA1(($key ^ $opad) . $hash1, true);
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return $hmac;
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}
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if (function_exists('hash') &&
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function_exists('hash_algos') &&
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(in_array('sha256', hash_algos()))) {
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function Auth_OpenID_SHA256($text)
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{
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// PHP 5 case: 'hash' available and 'sha256' algo supported.
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return hash('sha256', $text, true);
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}
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define('Auth_OpenID_SHA256_SUPPORTED', true);
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} else {
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define('Auth_OpenID_SHA256_SUPPORTED', false);
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}
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if (function_exists('hash_hmac') &&
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function_exists('hash_algos') &&
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(in_array('sha256', hash_algos()))) {
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function Auth_OpenID_HMACSHA256($key, $text)
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{
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// Return raw MAC (not hex string).
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return hash_hmac('sha256', $text, $key, true);
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}
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define('Auth_OpenID_HMACSHA256_SUPPORTED', true);
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} else {
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define('Auth_OpenID_HMACSHA256_SUPPORTED', false);
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}
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?>
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