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Diffstat (limited to 'extlib/Auth/OpenID/HMAC.php')
| -rw-r--r-- | extlib/Auth/OpenID/HMAC.php | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/extlib/Auth/OpenID/HMAC.php b/extlib/Auth/OpenID/HMAC.php new file mode 100644 index 000000000..ec42db8df --- /dev/null +++ b/extlib/Auth/OpenID/HMAC.php @@ -0,0 +1,99 @@ +<?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); +} + +?>
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