oxdecryptor.php

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<?php

class oxDecryptor
{

    public function decrypt( $sString, $sKey )
    {
        $sKey = $this->_formKey($sKey, $sString);

        $sString = substr( $sString, 3 );
        $sString = str_replace( '!', '=', $sString );
        $sString = base64_decode( $sString );
        $sString = $sString ^ $sKey;

        return substr( $sString, 2, -2 );
    }

    protected function _formKey($sKey, $sString)
    {
        $sKey = '_' . $sKey;
        $iKeyLength = (strlen( $sString ) / strlen( $sKey )) + 5;

        return str_repeat( $sKey, $iKeyLength );
    }
}