lib/utility.php

   1 <?php
   2         function setEncryptCookie($key, $value, $time = 0, $path = '/') {
   3                 if (trim(SECURE_KEY) == '') {
   4                         setcookie($key, $value, $time, $path);
   5                 } else {
   6                         setcookie($key, encrypt($value), $time, $path);
   7                 }
   8         }
   9
  10         function getEncryptCookie($key) {
  11                 if ( isset($_COOKIE[$key]) ) {
  12                         if (trim(SECURE_KEY) == '') {
  13                                 return $_COOKIE[$key];
  14                         } else {
  15                                 return decrypt($_COOKIE[$key]);
  16                         }
  17                 } else {
  18                         return null;
  19                 }
  20         }
  21
  22         function getCookie($key) {
  23                 if ( isset($_COOKIE[$key]) )
  24                         return $_COOKIE[$key];
  25                 else
  26                         return null;
  27         }
  28
  29         function delCookie($key) {
  30                 setcookie($key, '', $_SERVER['REQUEST_TIME']-300, '/');
  31         }
  32
  33         function encrypt($plain_text) {
  34                 if ( !function_exists('mcrypt_module_open') ) {
  35                         return EDencrypt($plain_text, SECURE_KEY);
  36                 }
  37                 $td = mcrypt_module_open('blowfish', '', 'cfb', '');
  38                 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
  39                 mcrypt_generic_init($td, SECURE_KEY, $iv);
  40                 $crypt_text = mcrypt_generic($td, $plain_text);
  41                 mcrypt_generic_deinit($td);
  42                 return base64_encode($iv.$crypt_text);
  43         }
  44
  45         function decrypt($crypt_text) {
  46                 if ( !function_exists('mcrypt_module_open') ) {
  47                         return EDdecrypt($crypt_text, SECURE_KEY);
  48                 }
  49                 $crypt_text = base64_decode($crypt_text);
  50                 $td = mcrypt_module_open('blowfish', '', 'cfb', '');
  51                 $ivsize = mcrypt_enc_get_iv_size($td);
  52                 $iv = substr($crypt_text, 0, $ivsize);
  53                 $crypt_text = substr($crypt_text, $ivsize);
  54                 mcrypt_generic_init($td, SECURE_KEY, $iv);
  55                 $plain_text = mdecrypt_generic($td, $crypt_text);
  56                 mcrypt_generic_deinit($td);
  57
  58                 return $plain_text;
  59         }
  60
  61         if ( !function_exists('mb_strlen') ) {
  62                 function mb_strlen($text, $encode) {
  63                         if (strtolower($encode) == 'utf-8') {
  64                                 return preg_match_all('%(?:
  65                                         [\x09\x0A\x0D\x20-\x7E]     # ASCII
  66                                         | [\xC2-\xDF][\x80-\xBF]# non-overlong 2-byte
  67                                         |  \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
  68                                         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
  69                                         |  \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
  70                                         |  \xF0[\x90-\xBF][\x80-\xBF]{2}    # planes 1-3
  71                                         | [\xF1-\xF3][\x80-\xBF]{3}   # planes 4-15
  72                                         |  \xF4[\x80-\x8F][\x80-\xBF]{2}    # plane 16
  73                                 )%xs',$text,$out);
  74                         }else{
  75                                 return strlen($text);
  76                         }
  77                 }
  78         }
  79
  80         function keyED($txt,$encrypt_key) {
  81
  82                 $encrypt_key = md5($encrypt_key);
  83                 $ctr=0;
  84                 $tmp = "";
  85
  86                 for ($i=0;$i<strlen($txt);$i++) {
  87                         if ($ctr==strlen($encrypt_key)) $ctr=0;
  88                         $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
  89                         $ctr++;
  90                 }
  91
  92                 return $tmp;
  93         }
  94
  95         function EDencrypt($txt,$key) {
  96
  97                 srand((double)microtime()*1000000);
  98                 $encrypt_key = md5(rand(0,32000));
  99                 $ctr=0;
 100                 $tmp = "";
 101
 102                 for ($i=0;$i<strlen($txt);$i++) {
 103                         if ($ctr==strlen($encrypt_key)) $ctr=0;
 104                         $tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
 105                         $ctr++;
 106                 }
 107
 108                 return keyED($tmp,$key);
 109         }
 110
 111         function EDdecrypt($txt,$key) {
 112
 113                 $txt = keyED($txt,$key);
 114                 $tmp = "";
 115
 116                 for ($i=0;$i<strlen($txt);$i++) {
 117                         $md5 = substr($txt,$i,1);
 118                         $i++;
 119                         $tmp.= (substr($txt,$i,1) ^ $md5);
 120                 }
 121
 122                 return $tmp;
 123
 124         }
 125 ?>