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File: class.signature.php

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  Classes of Lopo Lencastre de Almeida  >  Signature  >  class.signature.php  >  Download  
File: class.signature.php
Role: Class source
Content type: text/plain
Description: The class
Class: Signature
Generate signatures that identify the current user
Author: By
Last change: Added donation link. Help us in our free work.
Date: 5 years ago
Size: 4,027 bytes
 

Contents

Class file image Download
<?
   
/**
    * Simple and easy secure encrypted unique signature
    *
    * Basically this algorithm provides a unique signature for a specific visitor
    *
    * @requirements PHP 5.x
    * PEAR Crypt HMAC2 <http://pear.php.net/package/Crypt_HMAC2>
    * PEAR Net User Agent <http://pear.php.net/package/Net_UserAgent_Detect/>
    * @usage
    * require_once 'class.signature.php';
    * $sign = new signature();
    * $signature = $sign->create();
    *
    * @category Cryptography
    * @package Safe_Signature
    * @author Lopo Lencastre de Almeida, iPublicis - Internet Agency, Portugal <http://www.ipublicis.com>
    * @license http://opensource.org/licenses/lgpl-3.0.html GNU Lesser General Public License v3
    * @version $Id: class.signature.php,v 1.0 2008/11/25 12:12:09 humaneasy Exp $
    * @link http://www.phpclasses.org/safe_signature
    * @donations http://smsh.me/7kit
    **/

   
class signature {

      
/**
        * Convert hexadecimal value to a Base64 string
        *
        * This method converts any given hexadecimal string to the corresponding Base64 string
        *
        * @access private
        * @param string Hexadecimal string
        * @return string Base64 string
        **/
       
protected function _hex2b64 ($str)
        {
           
$raw = '';
            for (
$i=0; $i < strlen($str); $i+=2)
            {
               
$raw .= chr(hexdec(substr($str, $i, 2)));
            }
            return
base64_encode($raw);
    }

      
/**
        * Create CRC16 value
        *
        * Returns CRC16 of a string as int value. Used internaly.
        *
        * @access private
        * @param string Input string
        * @return string CRC16 int
        **/
       
protected function _crc16($string) {
           
$crc = 0xFFFF;
          for (
$x = 0; $x < strlen ($string); $x++) {
              
$crc = $crc ^ ord($string[$x]);
               for (
$y = 0; $y < 8; $y++) {
                     if ((
$crc & 0x0001) == 0x0001) {
                          
$crc = (($crc >> 1) ^ 0xA001);
                     } else {
                   
$crc = $crc >> 1;
                }
            }
          }
          return
$crc;
    }

      
/**
        * Create the signature
        *
        * Method used for signature generation
        *
        * @access public
        * @param none
        * @return string Encoded encrypted signature
        */
       
public function create()
    {
           
$ip_address = $_SERVER['REMOTE_ADDR'];
           
$browser = serialize(array('browser' => Net_UserAgent_Detect::_getStaticProperty('browser'),
                                  
'features' => Net_UserAgent_Detect::_getStaticProperty('features'),
                                  
'leadingIdentifier' => Net_UserAgent_Detect::_getStaticProperty('leadingIdentifier'),
                                  
'majorVersion' => Net_UserAgent_Detect::_getStaticProperty('majorVersion'),
                                  
'options' => Net_UserAgent_Detect::_getStaticProperty('options'),
                                  
'os' => Net_UserAgent_Detect::_getStaticProperty('os'),
                                  
'quirks' => Net_UserAgent_Detect::_getStaticProperty('quirks'),
                                  
'subVersion' => Net_UserAgent_Detect::_getStaticProperty('subVersion'),
                                  
'userAgent' => Net_UserAgent_Detect::_getStaticProperty('userAgent'),
                                  
'version' => Net_UserAgent_Detect::_getStaticProperty('version'),
                                    ));

           
$nonce = $this->_crc16($browser);
           
$secretKey = md5($this->_crc16($ip_address));

           
$strToSign = $ip_address . "\n" . $browser . "\n" . $nonce;
           
$hasher = new Crypt_HMAC2($secretKey, "sha256");

            return
urlencode ($this->_hex2b64($hasher->hash($strToSign)));
    }
    }
?>