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-rw-r--r--extlib/Auth/OpenID/HMAC.php99
1 files changed, 99 insertions, 0 deletions
diff --git a/extlib/Auth/OpenID/HMAC.php b/extlib/Auth/OpenID/HMAC.php
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+++ b/extlib/Auth/OpenID/HMAC.php
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+<?php
+
+/**
+ * This is the HMACSHA1 implementation for the OpenID library.
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: See the COPYING file included in this distribution.
+ *
+ * @access private
+ * @package OpenID
+ * @author JanRain, Inc. <openid@janrain.com>
+ * @copyright 2005-2008 Janrain, Inc.
+ * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
+ */
+
+require_once 'Auth/OpenID.php';
+
+/**
+ * SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback
+ * implementation.
+ */
+define('Auth_OpenID_SHA1_BLOCKSIZE', 64);
+
+function Auth_OpenID_SHA1($text)
+{
+ if (function_exists('hash') &&
+ function_exists('hash_algos') &&
+ (in_array('sha1', hash_algos()))) {
+ // PHP 5 case (sometimes): 'hash' available and 'sha1' algo
+ // supported.
+ return hash('sha1', $text, true);
+ } else if (function_exists('sha1')) {
+ // PHP 4 case: 'sha1' available.
+ $hex = sha1($text);
+ $raw = '';
+ for ($i = 0; $i < 40; $i += 2) {
+ $hexcode = substr($hex, $i, 2);
+ $charcode = (int)base_convert($hexcode, 16, 10);
+ $raw .= chr($charcode);
+ }
+ return $raw;
+ } else {
+ // Explode.
+ trigger_error('No SHA1 function found', E_USER_ERROR);
+ }
+}
+
+/**
+ * Compute an HMAC/SHA1 hash.
+ *
+ * @access private
+ * @param string $key The HMAC key
+ * @param string $text The message text to hash
+ * @return string $mac The MAC
+ */
+function Auth_OpenID_HMACSHA1($key, $text)
+{
+ if (Auth_OpenID::bytes($key) > Auth_OpenID_SHA1_BLOCKSIZE) {
+ $key = Auth_OpenID_SHA1($key, true);
+ }
+
+ $key = str_pad($key, Auth_OpenID_SHA1_BLOCKSIZE, chr(0x00));
+ $ipad = str_repeat(chr(0x36), Auth_OpenID_SHA1_BLOCKSIZE);
+ $opad = str_repeat(chr(0x5c), Auth_OpenID_SHA1_BLOCKSIZE);
+ $hash1 = Auth_OpenID_SHA1(($key ^ $ipad) . $text, true);
+ $hmac = Auth_OpenID_SHA1(($key ^ $opad) . $hash1, true);
+ return $hmac;
+}
+
+if (function_exists('hash') &&
+ function_exists('hash_algos') &&
+ (in_array('sha256', hash_algos()))) {
+ function Auth_OpenID_SHA256($text)
+ {
+ // PHP 5 case: 'hash' available and 'sha256' algo supported.
+ return hash('sha256', $text, true);
+ }
+ define('Auth_OpenID_SHA256_SUPPORTED', true);
+} else {
+ define('Auth_OpenID_SHA256_SUPPORTED', false);
+}
+
+if (function_exists('hash_hmac') &&
+ function_exists('hash_algos') &&
+ (in_array('sha256', hash_algos()))) {
+
+ function Auth_OpenID_HMACSHA256($key, $text)
+ {
+ // Return raw MAC (not hex string).
+ return hash_hmac('sha256', $text, $key, true);
+ }
+
+ define('Auth_OpenID_HMACSHA256_SUPPORTED', true);
+} else {
+ define('Auth_OpenID_HMACSHA256_SUPPORTED', false);
+}
+
+?> \ No newline at end of file