PHP Implementation Enhancements Mhash

How does PHP implement enhanced Mhash? This article mainly introduced the PHP implementation of the enhanced Mhash function, using the default Mhash function but error, found two solutions. We hope to help you.

Today, using PHP's cryptographic function Mhash, error: Fatal error:call to undefined function mhash ()

Mhash is a built-in function for PHP but uses an error.

Some studies summarize two methods:

1, Import php_mhash.dll extension file, in addition to import Libmhash.dll (Mhash library load dependent on this file),

Load LoadFile C:/php/libmhash.dll "in the Apache configuration file httpd.conf.

2, use the custom Mhash enhancement function.

function Hmac_md5 ($key, $data) {    if (extension_loaded (' Mhash '))    {        return Bin2Hex (Mhash (MHASH_MD5, $data, $key));    }    $b =;    if (strlen ($key) > $b)    {        $key = Pack (' h* ', MD5 ($key));    }    $key  = Str_pad ($key, $b, Chr (0x00));    $ipad = Str_pad (", $b, Chr (0x36));    $opad = Str_pad (", $b, Chr (0x5c));    $k _ipad = $key ^ $ipad;    $k _opad = $key ^ $opad;    return MD5 ($k _opad. Pack (' h* ', MD5 ($k _ipad. $data)));}

The parameters $key and $data in the HMAC_MD5 function correspond to mhash original 3,2 parameters.

Both of these methods can be used successfully on the PHP mhash encryption function

Related recommendations:

PHP Encryption Extension Library-mhash extension Library instance Usage

How to install Mhash extension Library in PHP _php tutorial

PHP Formhash specifically how to do