HMAC.php File Reference

Go to the source code of this file.

Namespaces
namespace	OpenID
	This module contains code for dealing with associations between consumers and servers.

Functions
	Auth_OpenID_SHA1 ($text)
	Auth_OpenID_HMACSHA1 ($key, $text)
	Compute an HMAC/SHA1 hash.

Variables
const	Auth_OpenID_SHA1_BLOCKSIZE = 64
	SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback implementation.

Function Documentation

Auth_OpenID_HMACSHA1	(		$key,
			$text
	)

Compute an HMAC/SHA1 hash.

private

Parameters

string	$key	The HMAC key
string	$text	The message text to hash

Returns

string $mac The MAC

Definition at line 57 of file HMAC.php.

References Auth_OpenID_SHA1(), Auth_OpenID_SHA1_BLOCKSIZE, and Auth_OpenID\bytes().

{
    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 {

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Auth_OpenID_SHA1

(

$text

)

Definition at line 25 of file HMAC.php.

Referenced by Auth_OpenID_FileStore\_safe64(), Auth_OpenID_DumbStore\Auth_OpenID_DumbStore(), and Auth_OpenID_HMACSHA1().

{
    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);
    }
}

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Variable Documentation

const Auth_OpenID_SHA1_BLOCKSIZE = 64

SHA1_BLOCKSIZE is this module's SHA1 blocksize used by the fallback implementation.

Definition at line 23 of file HMAC.php.

Referenced by Auth_OpenID_HMACSHA1().